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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_EntityEmergingGrowthCompany_0" xml:lang="en-US">Entity Emerging Growth Company</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_EntityInteractiveDataCurrent_0" xml:lang="en-US">Entity Interactive Data Current</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_IcfrAuditorAttestationFlag_0" xml:lang="en-US">ICFR Auditor Attestation Flag</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_LocalPhoneNumber_0" xml:lang="en-US">Local Phone Number</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_Security12bTitle_0" xml:lang="en-US">Title of 12(b) Security</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_SecurityExchangeName_0" xml:lang="en-US">Security Exchange Name</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_dei_TradingSymbol_0" xml:lang="en-US">Trading Symbol</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_AccountingProfit_1" xml:lang="en-US">Loss before income taxes</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_0" xml:lang="en-US">Consideration transferred, acquisition-date fair value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_1" xml:lang="en-US">Purchase consideration</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares_1" xml:lang="en-US">Weighted average number of shares outstanding - diluted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets_0" xml:lang="en-US">Adjustments for decrease (increase) in derivative financial assets</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_0" xml:lang="en-US">Adjustments for decrease (increase) in trade accounts receivable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_1" xml:lang="en-US">Accounts receivable</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AdjustmentsForDeferredTaxExpense_1" xml:lang="en-US">Income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts_0" xml:lang="en-US">Adjustments for finance costs</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_0" xml:lang="en-US">Adjustments for income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_1" xml:lang="en-US">Income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities_0" xml:lang="en-US">Adjustments for increase (decrease) in employee benefit liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities_1" xml:lang="en-US">Share-based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable_0" xml:lang="en-US">Adjustments for increase (decrease) in trade accounts payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable_1" xml:lang="en-US">Trade and other payables</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AdjustmentsForInterestExpense_2" xml:lang="en-US">Interest expense</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_0" xml:lang="en-US">Adjustments to reconcile profit (loss) [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_1" xml:lang="en-US">Items not affecting cash:</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_1" xml:lang="en-US">Adjustments for undistributed profits of investments accounted for using equity method</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains_0" xml:lang="en-US">Adjustments for unrealised foreign exchange losses (gains)</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_AdministrativeExpense_2" xml:lang="en-US">Corporate administration</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets_0" xml:lang="en-US">Allowance account for credit losses of financial assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets_1" xml:lang="en-US">Allowance for doubtful accounts</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AmountsPayableRelatedPartyTransactions_0" xml:lang="en-US">Amounts payable, related party transactions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AmountsPayableRelatedPartyTransactions_1" xml:lang="en-US">Due from directors and management</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_AmountsPayableRelatedPartyTransactions_2" xml:lang="en-US">Due to directors and management</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AmountsReceivableRelatedPartyTransactions_0" xml:lang="en-US">Amounts receivable, related party transactions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_AmountsReceivableRelatedPartyTransactions_1" xml:lang="en-US">Due from directors and management</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_0" xml:lang="en-US">Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_1" xml:lang="en-US">Net asset acquired</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_AssetsAbstract_0" xml:lang="en-US">ASSETS</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_Borrowings_3" xml:lang="en-US">Loans payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_Borrowings_4" xml:lang="en-US">Amount owed</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Borrowings recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Security for loan amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_BottomOfRangeMember_0" xml:lang="en-US">Bottom of range [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_BottomOfRangeMember_1" xml:lang="en-US">Minimum [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_BottomOfRangeMember_2" xml:lang="en-US">Minimum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_BusinessCombinationsAxis_0" xml:lang="en-US">Business combinations [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_BusinessCombinationsDomain_0" xml:lang="en-US">Business combinations [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_Cash_0" xml:lang="en-US">Cash and cash equivalents, end of period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_Cash_1" xml:lang="en-US">Cash and cash equivalents, beginning of period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_Cash_2" xml:lang="en-US">Cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_Cash_3" xml:lang="en-US">Cash and cash equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_CashAndCashEquivalents_0" xml:lang="en-US">Cash and cash equivalents, end of year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_CashAndCashEquivalents_1" xml:lang="en-US">Cash and cash equivalents, beginning of year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashAndCashEquivalents_2" xml:lang="en-US">Cash and cash equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CashAndCashEquivalents_3" xml:lang="en-US">Cash and cash equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashAndCashEquivalents_4" xml:lang="en-US">Total cash and cash equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Cash and cash equivalents recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_2" xml:lang="en-US">Cash and cash equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_0" xml:lang="en-US">Cash flows from (used in) financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_1" xml:lang="en-US">Net cash provided by financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_2" xml:lang="en-US">Net cash provided by (used in) financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_0" xml:lang="en-US">Cash flows from (used in) financing activities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_1" xml:lang="en-US">CASH FLOWS FROM FINANCING ACTIVITIES</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_0" xml:lang="en-US">Cash flows from (used in) investing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_1" xml:lang="en-US">Net cash used in investing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_0" xml:lang="en-US">Cash flows from (used in) investing activities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_1" xml:lang="en-US">CASH FLOWS FROM INVESTING ACTIVITIES</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_0" xml:lang="en-US">Cash flows from (used in) operating activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_1" xml:lang="en-US">Net cash provided by (used in) operating activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_0" xml:lang="en-US">Cash flows from (used in) operating activities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_1" xml:lang="en-US">CASH FLOWS FROM OPERATING ACTIVITIES</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsAbstract_0" xml:lang="en-US">Categories of financial assets [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsAbstract_1" xml:lang="en-US">Financial assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_0" xml:lang="en-US">Categories of financial liabilities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_1" xml:lang="en-US">Financial liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesAxis_0" xml:lang="en-US">Categories of related parties [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesDomain_0" xml:lang="en-US">Categories of related parties [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ChangesInFairValueOfCreditDerivativeAbstract_0" xml:lang="en-US">Changes in fair value of credit derivative [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsAxis_0" xml:lang="en-US">Classes of financial instruments [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsDomain_0" xml:lang="en-US">Classes of financial instruments [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ClosingForeignExchangeRate_0" xml:lang="en-US">Closing foreign exchange rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ClosingForeignExchangeRate_1" xml:lang="en-US">Foreign exchange rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis_0" xml:lang="en-US">Components of equity [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ComponentsOfEquityDomain_0" xml:lang="en-US">Components of equity [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_0" xml:lang="en-US">Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_1" xml:lang="en-US">Items that may be reclassified subsequently to profit and loss:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ComprehensiveIncome_0" xml:lang="en-US">Comprehensive income</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ComprehensiveIncome_1" xml:lang="en-US">Net income and comprehensive income for the period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_ComprehensiveIncome_2" xml:lang="en-US">Total comprehensive loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ComprehensiveIncome_3" xml:lang="en-US">Net income and comprehensive income for the year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ContractualCapitalCommitments_0" xml:lang="en-US">Contractual capital commitments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ContractualCapitalCommitments_1" xml:lang="en-US">Total contractual commitments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrencyRiskMember_0" xml:lang="en-US">Currency Risk [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentAssets_0" xml:lang="en-US">Current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CurrentAssets_1" xml:lang="en-US">Total current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentAssetsAbstract_0" xml:lang="en-US">Current assets [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentAssetsAbstract_1" xml:lang="en-US">Current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Current assets recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract_0" xml:lang="en-US">Current financial assets at fair value through profit or loss [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract_1" xml:lang="en-US">Fair value through profit or loss:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities_0" xml:lang="en-US">Current lease liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities_1" xml:lang="en-US">Lease liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_CurrentLiabilities_0" xml:lang="en-US">Current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentLiabilities_1" xml:lang="en-US">Current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CurrentLiabilities_2" xml:lang="en-US">Total current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract_0" xml:lang="en-US">Current Liabilities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract_1" xml:lang="en-US">Current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:label="lab_ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Current liabilities recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate_2" xml:lang="en-US">Current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentPrepaidExpenses_0" xml:lang="en-US">Current prepaid expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CurrentPrepaidExpenses_1" xml:lang="en-US">Prepaid expenses and other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax_0" xml:lang="en-US">Current receivables from taxes other than income tax</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax_1" xml:lang="en-US">GST and other recoverable taxes</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome_0" xml:lang="en-US">Current income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome_1" xml:lang="en-US">Current tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome_2" xml:lang="en-US">Current income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_CurrentTaxLiabilitiesCurrent_0" xml:lang="en-US">Income taxes payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentTaxLiabilitiesCurrent_1" xml:lang="en-US">Current tax liabilities, current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CurrentTaxLiabilitiesCurrent_2" xml:lang="en-US">Income taxes payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentTaxLiabilitiesCurrent_3" xml:lang="en-US">Taxes payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_ifrs-full_CurrentTradeReceivables_0" xml:lang="en-US">Royalty and stream receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveTerseLabel" xlink:label="lab_ifrs-full_CurrentTradeReceivables_1" xml:lang="en-US">Royalty and stream receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_CurrentTradeReceivables_2" xml:lang="en-US">Current trade receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_CurrentTradeReceivables_3" xml:lang="en-US">Receivables from provisional sales</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_CurrentTradeReceivables_4" xml:lang="en-US">Trade receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_0" xml:lang="en-US">Unrecognized deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_1" xml:lang="en-US">Deductible temporary differences for which no deferred tax asset is recognised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_2" xml:lang="en-US">Unrecognized deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DeferredTaxAssets_0" xml:lang="en-US">Deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DeferredTaxAssets_1" xml:lang="en-US">Deferred income tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract_0" xml:lang="en-US">Deferred tax assets and liabilities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome_0" xml:lang="en-US">Deferred income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome_1" xml:lang="en-US">Deferred tax expense (income)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome_2" xml:lang="en-US">Deferred income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome_3" xml:lang="en-US">Deferred income tax recovery</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilities_0" xml:lang="en-US">Deferred income tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DeferredTaxLiabilities_1" xml:lang="en-US">Deferred tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilities_2" xml:lang="en-US">Deferred income tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_0" xml:lang="en-US">Deferred tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_1" xml:lang="en-US">Net deferred income tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_2" xml:lang="en-US">Net deferred tax liability (asset)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_3" xml:lang="en-US">Deferred tax liability (asset) at end of period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_4" xml:lang="en-US">Deferred tax liability (asset) at beginning of period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_5" xml:lang="en-US">Deferred tax liability (asset)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_6" xml:lang="en-US">Deferred income tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset_7" xml:lang="en-US">Net deferred income tax asset (liability)</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_1" xml:lang="en-US">Basis of preparation and measurement</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory_1" xml:lang="en-US">Share Capital [Policy Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithRelatedPartiesExplanatory_1" xml:lang="en-US">Related Party Transactions [Policy Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_0" xml:lang="en-US">Expected volatility, share options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_1" xml:lang="en-US">Expected stock price volatility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DescriptionOfNatureOfChangeInAccountingPolicy_0" xml:lang="en-US">Description of nature of change in accounting policy</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DescriptionOfNatureOfChangeInAccountingPolicy_1" xml:lang="en-US">Change in Accounting Policy [Policy Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DescriptionOfOptionLifeShareOptionsGranted_1" xml:lang="en-US">Expected life in years</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_0" xml:lang="en-US">Risk free interest rate, share options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_1" xml:lang="en-US">Risk free interest rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DesignatedFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract_0" xml:lang="en-US">Designated financial liabilities at fair value through profit or loss [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DesignatedFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract_1" xml:lang="en-US">Fair value through profit or loss:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare_0" xml:lang="en-US">Diluted earnings (loss) per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare_1" xml:lang="en-US">Earnings (loss) per share - diluted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_0" xml:lang="en-US">Principles of consolidation [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_1" xml:lang="en-US">Principles of Consolidation [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_0" xml:lang="en-US">Disclosure of basis of preparation of financial statements [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_1" xml:lang="en-US">Basis of Preparation and Measurement [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfBorrowingsExplanatory_0" xml:lang="en-US">Disclosure of borrowings [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfBorrowingsExplanatory_1" xml:lang="en-US">LOANS PAYABLE [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfBreakdownOfAssetsAndLiabilitiesAggregatedIntoSingleLineInvestmentBalanceTransitionFromProportionateConsolidationToEquityMethodExplanatory_0" xml:lang="en-US">Disclosure of breakdown of assets and liabilities aggregated into single line investment balance, transition from proportionate consolidation to equity method [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfBreakdownOfAssetsAndLiabilitiesAggregatedIntoSingleLineInvestmentBalanceTransitionFromProportionateConsolidationToEquityMethodExplanatory_1" xml:lang="en-US">Disclosure of detailed information about associates [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfCashFlowStatementExplanatory_0" xml:lang="en-US">Disclosure of cash flow statement [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfCashFlowStatementExplanatory_1" xml:lang="en-US">SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfChangesInAccountingEstimatesExplanatory_0" xml:lang="en-US">Critical accounting estimates and judgments [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfChangesInAccountingEstimatesExplanatory_1" xml:lang="en-US">Critical Accounting Estimates and Judgments [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory_0" xml:lang="en-US">Disclosure of significant accounting policies [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory_1" xml:lang="en-US">SUMMARY OF MATERIAL ACCOUNTING POLICIES [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalAbstract_0" xml:lang="en-US">Disclosure of classes of share capital [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_0" xml:lang="en-US">Disclosure of classes of share capital [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_1" xml:lang="en-US">SHARE CAPITAL [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_0" xml:lang="en-US">Disclosure of classes of share capital [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable_0" xml:lang="en-US">Disclosure of classes of share capital [table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfCommitmentsExplanatory_0" xml:lang="en-US">Disclosure of commitments [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfCommitmentsExplanatory_1" xml:lang="en-US">COMMITMENTS [Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfDeferredTaxesExplanatory_1" xml:lang="en-US">Disclosure of detailed information about deferred income tax asset (liability) [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_0" xml:lang="en-US">Disclosure of derivative financial instruments [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_1" xml:lang="en-US">DERIVATIVE ROYALTY ASSET [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_0" xml:lang="en-US">Disclosure of detailed information about borrowings [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_1" xml:lang="en-US">Disclosure of detailed information about loans payable [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsAbstract_0" xml:lang="en-US">Disclosure of detailed information about financial instruments [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_0" xml:lang="en-US">Disclosure of financial instruments [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_1" xml:lang="en-US">FINANCIAL INSTRUMENTS [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xml:lang="en-US">Disclosure of detailed information about financial instruments [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsTable_0" xml:lang="en-US">Disclosure of detailed information about financial instruments [table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfGeneralAndAdministrativeExpenseExplanatory_0" xml:lang="en-US">Disclosure of general and administrative expense [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfGeneralAndAdministrativeExpenseExplanatory_1" xml:lang="en-US">GENERAL AND ADMINISTRATIVE EXPENSES [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfGeographicalAreasExplanatory_0" xml:lang="en-US">Disclosure of geographical areas [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DisclosureOfGeographicalAreasExplanatory_1" xml:lang="en-US">Disclosure of detailed information about revenue [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_0" xml:lang="en-US">Disclosure of income tax [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_1" xml:lang="en-US">INCOME TAXES [Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory_1" xml:lang="en-US">Disclosure of detailed information about pricing model with weighted average assumptions for share option granted [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_0" xml:lang="en-US">Disclosure of information about key management personnel [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_1" xml:lang="en-US">Disclosure of detailed information about transactions between related parties [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory_0" xml:lang="en-US">Disclosure of investments accounted for using equity method [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory_1" xml:lang="en-US">INVESTMENT IN SILVERBACK [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract_0" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodExplanatory_0" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodExplanatory_1" xml:lang="en-US">EVENTS AFTER REPORTING DATE [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_0" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_0" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory_0" xml:lang="en-US">Disclosure of number and weighted average exercise prices of other equity instruments [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory_1" xml:lang="en-US">Disclosure of detailed information about number and weighted average exercise prices of restricted share units [Table Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfOperatingSegmentsTable_0" xml:lang="en-US">Disclosure of operating segments [table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory_0" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory_1" xml:lang="en-US">Disclosure of detailed information about range of exercise prices of outstanding share options [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_0" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_0" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [table]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory_1" xml:lang="en-US">RELATED PARTY TRANSACTIONS AND BALANCES [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfRevenueExplanatory_0" xml:lang="en-US">Disclosure of revenue [text block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_DisclosureOfRevenueFromContractsWithCustomersExplanatory_1" xml:lang="en-US">Disclosure of detailed information about revenue [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract_0" xml:lang="en-US">Disclosure of associates [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_0" xml:lang="en-US">Disclosure of associates [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_0" xml:lang="en-US">Disclosure of associates [table]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory_0" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [text block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory_1" xml:lang="en-US">Disclosure of detailed information about significant temporary differences, unused tax credits, and unused tax losses [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_0" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_0" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_0" xml:lang="en-US">Disclosure of trade and other payables [text block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_1" xml:lang="en-US">ACCOUNTS RECEIVABLE [Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_0" xml:lang="en-US">Disclosure of transactions between related parties [table]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_0" xml:lang="en-US">Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [table]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_Equity_3" xml:lang="en-US">Total equity</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveVerboseLabel" xlink:label="lab_ifrs-full_EquityInterestsOfAcquirer_1" xml:lang="en-US">Mineral interests</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_EquityInterestsOfAcquirer_3" xml:lang="en-US">Common shares issued</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted_0" xml:lang="en-US">Expected dividend as percentage, share options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted_1" xml:lang="en-US">Expected dividend yield</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_1" xml:lang="en-US">Expense from share-based payment transactions with employees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_2" xml:lang="en-US">Share-based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_FinanceCosts_0" xml:lang="en-US">Finance charges</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinanceCosts_1" xml:lang="en-US">Finance costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_FinanceCosts_2" xml:lang="en-US">Finance charges</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue_0" xml:lang="en-US">Financial assets, at fair value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue_1" xml:lang="en-US">Total financial assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/commentaryGuidance" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss_0" xml:lang="en-US">This element should be used to tag non-restated comparative information only.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss_1" xml:lang="en-US">Marketable securities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss_2" xml:lang="en-US">Financial assets at fair value through profit or loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss_3" xml:lang="en-US">Total financial assets at fair value through profit or loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss_4" xml:lang="en-US">Marketable securities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Financial assets recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Marketable securities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinancialLiabilities_0" xml:lang="en-US">Financial liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCost_0" xml:lang="en-US">Financial liabilities at amortised cost</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCost_1" xml:lang="en-US">Total financial liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtFairValue_0" xml:lang="en-US">Financial liabilities, at fair value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtFairValue_1" xml:lang="en-US">RCF, fair value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtFairValue_2" xml:lang="en-US">Derivative loan liability fair value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid_0" xml:lang="en-US">Loss on extinguishment of convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:label="lab_ifrs-full_GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid_1" xml:lang="en-US">Extinguishment of loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid_2" xml:lang="en-US">Gain (loss) arising from difference between carrying amount of financial liability extinguished and consideration paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid_3" xml:lang="en-US">Loss on extinguishment of convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_0" xml:lang="en-US">Mark-to-market loss (gain) on derivatives</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_1" xml:lang="en-US">Net gains (losses) on change in fair value of derivatives</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_2" xml:lang="en-US">Gains (losses) on change in fair value of derivatives</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_3" xml:lang="en-US">Mark-to-market gain (loss) on derivatives</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_0" xml:lang="en-US">Foreign exchange gain (loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_1" xml:lang="en-US">Foreign exchange gain (loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_2" xml:lang="en-US">Foreign exchange loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_3" xml:lang="en-US">Foreign exchange gain (loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_GainsOnChangeInFairValueOfDerivatives_0" xml:lang="en-US">Mark-to-market loss (gain) on derivative royalty asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_ifrs-full_GainsOnChangeInFairValueOfDerivatives_1" xml:lang="en-US">Fair value gain on derivative loan liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GainsOnChangeInFairValueOfDerivatives_2" xml:lang="en-US">Gains on change in fair value of derivatives</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_GainsOnChangeInFairValueOfDerivatives_3" xml:lang="en-US">Mark-to-market gain (loss) on derivative royalty asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense_0" xml:lang="en-US">General and administrative expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense_1" xml:lang="en-US">General and administrative expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense_2" xml:lang="en-US">Total general and administrative expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense_3" xml:lang="en-US">General and administrative expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GeographicalAreasAxis_0" xml:lang="en-US">Geographical areas [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GrossLoanCommitments_0" xml:lang="en-US">Gross loan commitments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_GrossLoanCommitments_1" xml:lang="en-US">Loan facility, conversion price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_GrossProfit_0" xml:lang="en-US">Gross profit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_GrossProfit_1" xml:lang="en-US">Gross profit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_0" xml:lang="en-US">Identifiable assets acquired (liabilities assumed)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_1" xml:lang="en-US">Total assets acquired, net of liabilities assumed</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_2" xml:lang="en-US">Net asset acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_3" xml:lang="en-US">Net asset acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Identifiable intangible assets recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">NSR interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_2" xml:lang="en-US">Genesis and GSI NSR interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_ImpairmentLoss_0" xml:lang="en-US">Royalty interest impairment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveTerseLabel" xlink:label="lab_ifrs-full_ImpairmentLoss_1" xml:lang="en-US">Loss on extinguishment of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ImpairmentLoss_2" xml:lang="en-US">Impairment loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ImpairmentLoss_3" xml:lang="en-US">Impairment charge</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ImpairmentLoss_4" xml:lang="en-US">Royalty interest impairment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncomeStatementAbstract_0" xml:lang="en-US">Profit or loss [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_0" xml:lang="en-US">Income taxes paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_1" xml:lang="en-US">Income taxes paid (refund), classified as operating activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_0" xml:lang="en-US">Tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_1" xml:lang="en-US">Total income tax expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_0" xml:lang="en-US">Increase (decrease) in cash and cash equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_1" xml:lang="en-US">Changes in cash and cash equivalents during year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_2" xml:lang="en-US">Change in cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateContingentLiabilitiesRecognisedInBusinessCombination_0" xml:lang="en-US">Increase (decrease) through change in discount rate, contingent liabilities recognised in business combination</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateContingentLiabilitiesRecognisedInBusinessCombination_1" xml:lang="en-US">Amount of estimated payment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments_0" xml:lang="en-US">Increase (decrease) through conversion of convertible instruments, equity</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments_1" xml:lang="en-US">Proceeds from issuance of common stock on conversion of debenture</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments_2" xml:lang="en-US">Conversion of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_0" xml:lang="en-US">Exercise of stock options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_0" xml:lang="en-US">Share-based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_1" xml:lang="en-US">Share-based payments - stock options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_2" xml:lang="en-US">Share-based payments expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_InterestExpense_0" xml:lang="en-US">Interest expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InterestExpense_1" xml:lang="en-US">Interest expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_InterestExpense_2" xml:lang="en-US">Interest and accretion expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InterestExpenseOnBorrowings_0" xml:lang="en-US">Interest expense on borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities_0" xml:lang="en-US">Interest paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities_1" xml:lang="en-US">Interest payment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities_2" xml:lang="en-US">Interest paid, classified as financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InterestPayable_0" xml:lang="en-US">Interest payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_InterestPayable_1" xml:lang="en-US">Accrued interest and fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InterestRateRiskMember_0" xml:lang="en-US">Interest rate risk [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_InterestRateRiskMember_1" xml:lang="en-US">Interest rate risk [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_0" xml:lang="en-US">Ending balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_1" xml:lang="en-US">Opening balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_2" xml:lang="en-US">Investments accounted for using equity method</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_3" xml:lang="en-US">Investment in Silverback</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InvestmentPropertyAbstract_0" xml:lang="en-US">Investment property [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_InvestmentPropertyMember_0" xml:lang="en-US">Investment property [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IssuedCapital_0" xml:lang="en-US">Issued capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IssuedCapital_1" xml:lang="en-US">Share capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_IssuedCapitalMember_0" xml:lang="en-US">Issued capital [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_IssuedCapitalMember_1" xml:lang="en-US">Share capital [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensation_0" xml:lang="en-US">Key management personnel compensation</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensation_1" xml:lang="en-US">Total related party expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_0" xml:lang="en-US">Key management personnel compensation, share-based payment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_1" xml:lang="en-US">Share-based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_0" xml:lang="en-US">Key management personnel compensation, short-term employee benefits</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_1" xml:lang="en-US">Management services</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_2" xml:lang="en-US">Salaries and fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_0" xml:lang="en-US">Later than one year and not later than three years [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_1" xml:lang="en-US">1 to 3 years [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_LaterThanThreeYearsMember_0" xml:lang="en-US">Later than three years [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_LaterThanThreeYearsMember_1" xml:lang="en-US">Over 3 years [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember_0" xml:lang="en-US">Level 2 of fair value hierarchy [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember_1" xml:lang="en-US">Level 2 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember_2" xml:lang="en-US">Level 1</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyAxis_0" xml:lang="en-US">Levels of fair value hierarchy [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_Liabilities_0" xml:lang="en-US">Total liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:label="lab_ifrs-full_Liabilities_1" xml:lang="en-US">Total liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_Liabilities_2" xml:lang="en-US">Liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_Liabilities_3" xml:lang="en-US">Total liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_LiabilitiesAbstract_0" xml:lang="en-US">LIABILITIES</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_LoanCommitmentsMember_0" xml:lang="en-US">Loan commitments [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_LoanCommitmentsMember_1" xml:lang="en-US">Loans payable principal and interest payments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_LongtermBorrowings_0" xml:lang="en-US">Non-current portion of non-current borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_LongtermBorrowings_1" xml:lang="en-US">Revolving credit facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_LongtermBorrowings_2" xml:lang="en-US">Long term portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract_0" xml:lang="en-US">INCOME TAXES [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_MaturityAxis_0" xml:lang="en-US">Maturity [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_MaturityDomain_0" xml:lang="en-US">Maturity [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_MeasurementAxis_0" xml:lang="en-US">Measurement [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_NetForeignExchangeLoss_0" xml:lang="en-US">Foreign exchange gain (loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NetForeignExchangeLoss_1" xml:lang="en-US">Net foreign exchange loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NetForeignExchangeLoss_2" xml:lang="en-US">Foreign exchange loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_0" xml:lang="en-US">Non-adjusting events after reporting period [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_0" xml:lang="en-US">Non-adjusting events after reporting period [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NoncurrentAssets_0" xml:lang="en-US">Non-current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_NoncurrentAssets_1" xml:lang="en-US">Total non-current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NoncurrentAssets_2" xml:lang="en-US">Total non-current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract_0" xml:lang="en-US">Non-current assets [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract_1" xml:lang="en-US">Non-current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialAssets_0" xml:lang="en-US">Non-current derivative financial assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialAssets_1" xml:lang="en-US">Long-term portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NoncurrentLiabilities_0" xml:lang="en-US">Non-current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_NoncurrentLiabilities_1" xml:lang="en-US">Total non-current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract_0" xml:lang="en-US">Non-current liabilities [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract_1" xml:lang="en-US">Non-current liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember_0" xml:lang="en-US">Not later than one year [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember_1" xml:lang="en-US">Less than 1 year [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_0" xml:lang="en-US">Number of instruments or interests issued or issuable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_1" xml:lang="en-US">Number of common shares issued for acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_2" xml:lang="en-US">Total Number of Metalla Shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_0" xml:lang="en-US">Number of other equity instruments granted in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_1" xml:lang="en-US">Number of RSUs granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_2" xml:lang="en-US">Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_0" xml:lang="en-US">Settled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_1" xml:lang="en-US">Number of other equity instruments exercised or vested in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_2" xml:lang="en-US">RSUs settled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_0" xml:lang="en-US">Forfeited</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_1" xml:lang="en-US">Number of other equity instruments forfeited in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_0" xml:lang="en-US">Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_1" xml:lang="en-US">Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_2" xml:lang="en-US">Number of other equity instruments outstanding in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions_0" xml:lang="en-US">Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions_1" xml:lang="en-US">Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions_2" xml:lang="en-US">Number of share options outstanding in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions_3" xml:lang="en-US">Number Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_0" xml:lang="en-US">Number of share options exercisable in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_1" xml:lang="en-US">Number Exercisable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_0" xml:lang="en-US">Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_1" xml:lang="en-US">Number of share options exercised in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_2" xml:lang="en-US">Number of stock options exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_3" xml:lang="en-US">Number of share options exercised in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement_0" xml:lang="en-US">Expired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement_1" xml:lang="en-US">Number of share options expired in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_0" xml:lang="en-US">Forfeited</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_1" xml:lang="en-US">Number of share options forfeited in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_0" xml:lang="en-US">Number of share options granted in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_1" xml:lang="en-US">Stock options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_2" xml:lang="en-US">Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfSharesIssued_0" xml:lang="en-US">Number of shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding_0" xml:lang="en-US">Balance ending (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding_1" xml:lang="en-US">Balance opening (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding_2" xml:lang="en-US">Number of shares outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding_3" xml:lang="en-US">Common shares outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherCurrentPayables_0" xml:lang="en-US">Other current payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_OtherCurrentPayables_1" xml:lang="en-US">Current acquisition payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherCurrentReceivables_0" xml:lang="en-US">Other current receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_OtherCurrentReceivables_1" xml:lang="en-US">Other receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_0" xml:lang="en-US">Other inflows (outflows) of cash, classified as operating activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_1" xml:lang="en-US">Other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherNoncurrentPayables_0" xml:lang="en-US">Other non-current payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_OtherNoncurrentPayables_1" xml:lang="en-US">Acquisition payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense_0" xml:lang="en-US">Other income (expenses)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense_1" xml:lang="en-US">Other operating income (expense)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense_2" xml:lang="en-US">Accretion and other expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense_3" xml:lang="en-US">Other income (expenses)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherReceivables_0" xml:lang="en-US">Other receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_OtherReceivables_1" xml:lang="en-US">Other receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherReserves_0" xml:lang="en-US">Other reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_OtherReserves_1" xml:lang="en-US">Reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherReservesMember_0" xml:lang="en-US">Other reserves [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_OtherReservesMember_1" xml:lang="en-US">Reserves [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_0" xml:lang="en-US">Other tax effects for reconciliation between accounting profit and tax expense (income)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_1" xml:lang="en-US">Other adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_PaymentsForDebtIssueCosts_0" xml:lang="en-US">Payments for debt issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_PaymentsForDebtIssueCosts_1" xml:lang="en-US">Transaction costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_PaymentsRelatingToRoyaltiesFeesAndCommissions_0" xml:lang="en-US">Accrued fees payment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_PaymentsRelatingToRoyaltiesFeesAndCommissions_1" xml:lang="en-US">Payments relating to royalties, fees and commissions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_0" xml:lang="en-US">Proceeds from borrowings, classified as financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_1" xml:lang="en-US">Proceeds from borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_2" xml:lang="en-US">Draw down on revolving credit facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProceedsFromExerciseOfOptions_0" xml:lang="en-US">Proceeds from exercise of options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ProceedsFromExerciseOfOptions_1" xml:lang="en-US">Proceeds from exercise of stock options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProceedsFromIssuingShares_0" xml:lang="en-US">Proceeds from issuing shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProfessionalFeesExpense_0" xml:lang="en-US">Professional fees expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ProfessionalFeesExpense_1" xml:lang="en-US">Professional fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_ifrs-full_ProfitLoss_0" xml:lang="en-US">Loss for the year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProfitLoss_1" xml:lang="en-US">Profit (loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ProfitLoss_2" xml:lang="en-US">Net loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_ProfitLoss_3" xml:lang="en-US">Net loss and comprehensive loss</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProfitLossBeforeTax_0" xml:lang="en-US">Profit (loss) before tax</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_ProfitLossBeforeTax_1" xml:lang="en-US">Loss before income taxes</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ProfitLossBeforeTax_2" xml:lang="en-US">Loss before income taxes</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProfitLossFromContinuingOperations_0" xml:lang="en-US">Profit (loss) from continuing operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_ProfitLossFromContinuingOperations_1" xml:lang="en-US">Loss from operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities_0" xml:lang="en-US">Profit (loss) from operating activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities_1" xml:lang="en-US">Loss from operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_0" xml:lang="en-US">Proportion of ownership interest in subsidiary</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_1" xml:lang="en-US">Percentage of ownership interest in subsidiary</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_0" xml:lang="en-US">Proportion of ownership interests held by non-controlling interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RangeAxis_0" xml:lang="en-US">Range [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RangeDomain_0" xml:lang="en-US">Range [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_0" xml:lang="en-US">Settlement of convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_1" xml:lang="en-US">Repayments of borrowings, classified as financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_2" xml:lang="en-US">Principal repayment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_RepaymentsOfCurrentBorrowings_0" xml:lang="en-US">Principal repayment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RepaymentsOfCurrentBorrowings_1" xml:lang="en-US">Repayments of current borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_RepaymentsOfCurrentBorrowings_2" xml:lang="en-US">Repayment of loans</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_RepaymentsOfCurrentBorrowings_3" xml:lang="en-US">Repayments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_RetainedEarnings_0" xml:lang="en-US">Cumulative deficit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RetainedEarnings_1" xml:lang="en-US">Retained earnings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_RetainedEarnings_2" xml:lang="en-US">Cumulative deficit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_RetainedEarnings_3" xml:lang="en-US">Deficit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RetainedEarningsMember_0" xml:lang="en-US">Retained earnings [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_RetainedEarningsMember_1" xml:lang="en-US">Deficit [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_Revenue_0" xml:lang="en-US">Revenue</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_Revenue_1" xml:lang="en-US">Revenue from royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_Revenue_2" xml:lang="en-US">Total revenue</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_Revenue_3" xml:lang="en-US">Total revenue</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RevenueAbstract_0" xml:lang="en-US">Revenue [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RevenueFromRoyalties_0" xml:lang="en-US">Royalty income</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_RevenueFromRoyalties_1" xml:lang="en-US">Total royalty revenue</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_RoyaltyExpense_0" xml:lang="en-US">Royalty expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_RoyaltyExpense_1" xml:lang="en-US">Other fixed royalty payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SegmentConsolidationItemsAxis_0" xml:lang="en-US">Segment consolidation items [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SegmentsAxis_0" xml:lang="en-US">Segments [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SegmentsDomain_0" xml:lang="en-US">Segments [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SellingGeneralAndAdministrativeExpenseAbstract_0" xml:lang="en-US">Selling, general and administrative expense [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_0" xml:lang="en-US">Share of net income of Silverback</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_1" xml:lang="en-US">Share of profit (loss) of associates accounted for using equity method</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_2" xml:lang="en-US">Share of net income of Silverback</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_3" xml:lang="en-US">Income (loss) in Silverback for the period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ShorttermBorrowings_0" xml:lang="en-US">Current borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_ShorttermBorrowings_1" xml:lang="en-US">Convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_0" xml:lang="en-US">Subsidiaries [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_0" xml:lang="en-US">Subsidiaries [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_StatementOfCashFlowsAbstract_0" xml:lang="en-US">Statement of cash flows [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_StatementOfChangesInEquityAbstract_0" xml:lang="en-US">Statement of changes in equity [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems_0" xml:lang="en-US">Statement of changes in equity [line items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_StatementOfChangesInEquityTable_0" xml:lang="en-US">Statement of changes in equity [table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract_0" xml:lang="en-US">Statement of financial position [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_SubsidiariesMember_0" xml:lang="en-US">Subsidiaries [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_SubsidiariesMember_1" xml:lang="en-US">Silverback Ltd. ("Silverback") [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_0" xml:lang="en-US">Tax effect of expense not deductible in determining taxable profit (tax loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_1" xml:lang="en-US">Permanent differences</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TaxEffectOfForeignTaxRates_0" xml:lang="en-US">Tax effect of foreign tax rates</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TaxEffectOfForeignTaxRates_1" xml:lang="en-US">Difference between Canadian and foreign tax rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_0" xml:lang="en-US">Tax expense (income) at applicable tax rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_1" xml:lang="en-US">Income tax recovery based on the above rates</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_0" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_0" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TopOfRangeMember_0" xml:lang="en-US">Top of range [member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TopOfRangeMember_1" xml:lang="en-US">Maximum [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TopOfRangeMember_2" xml:lang="en-US">Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables_0" xml:lang="en-US">Trade payables and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables_1" xml:lang="en-US">Trade and other current payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables_2" xml:lang="en-US">Accounts payable and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables_3" xml:lang="en-US">Total trade and other payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables_4" xml:lang="en-US">Trade and other payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_0" xml:lang="en-US">Trade payables and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_1" xml:lang="en-US">Current trade payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_2" xml:lang="en-US">Accounts payable and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_3" xml:lang="en-US">Total trade and other current payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers_4" xml:lang="en-US">Trade and other payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables_0" xml:lang="en-US">Trade and other current receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables_1" xml:lang="en-US">Accounts receivable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables_2" xml:lang="en-US">Total accounts receivable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables_3" xml:lang="en-US">Trade receivables and other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayables_0" xml:lang="en-US">Trade payables and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherPayables_1" xml:lang="en-US">Trade and other payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayables_2" xml:lang="en-US">Trade and other payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayables_3" xml:lang="en-US">Trade and other payables (Note 6)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayables_4" xml:lang="en-US">Trade payables and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherPayablesAbstract_0" xml:lang="en-US">Trade and other payables [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Trade and other payables recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Trade and other payables recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_2" xml:lang="en-US">Payables on acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_3" xml:lang="en-US">Acquisition payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers_0" xml:lang="en-US">Trade and other payables recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers_1" xml:lang="en-US">Trade payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers_2" xml:lang="en-US">Payables on acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TradeAndOtherReceivablesAbstract_0" xml:lang="en-US">Trade and other receivables [abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationAxis_0" xml:lang="en-US">Transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationDomain_0" xml:lang="en-US">Transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TypesOfRisksAxis_0" xml:lang="en-US">Types of risks [axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_TypesOfRisksDomain_0" xml:lang="en-US">Types of risks [domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities_0" xml:lang="en-US">Undrawn borrowing facilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities_1" xml:lang="en-US">Remaining subsequent advances of convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities_2" xml:lang="en-US">Undrawn loan facilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_ValueAtRisk_0" xml:lang="en-US">Value at risk</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WagesAndSalaries_0" xml:lang="en-US">Wages and salaries</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_WagesAndSalaries_1" xml:lang="en-US">Compensation and benefits</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_0" xml:lang="en-US">Weighted average exercise price of share options exercised in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_1" xml:lang="en-US">Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_2" xml:lang="en-US">Weighted average exercise price, Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019_0" xml:lang="en-US">Weighted average exercise price of share options expired in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019_1" xml:lang="en-US">Expired/cancelled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019_2" xml:lang="en-US">Weighted average exercise price, Expired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019_0" xml:lang="en-US">Weighted average exercise price of share options forfeited in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019_1" xml:lang="en-US">Weighted average exercise price, Forfeited</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_0" xml:lang="en-US">Weighted average exercise price of share options granted in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_1" xml:lang="en-US">Weighted average exercise price, Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_0" xml:lang="en-US">Weighted average exercise price, Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_1" xml:lang="en-US">Weighted average exercise price, Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_2" xml:lang="en-US">Weighted average exercise price of share options outstanding in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_0" xml:lang="en-US">Weighted average fair value at measurement date, share options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_1" xml:lang="en-US">Weighted average fair value per option granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_2" xml:lang="en-US">Weighted average price per options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_0" xml:lang="en-US">Weighted average remaining contractual life of outstanding share options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_1" xml:lang="en-US">Weighted average remaining life of stock options outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ifrs-full_WeightedAverageShares_0" xml:lang="en-US">Weighted average number of ordinary shares outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_ifrs-full_WeightedAverageShares_1" xml:lang="en-US">Weighted average number of shares outstanding - basic</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AAndRLoanFacilityDebtPortionMember_0" xml:lang="en-US">This member stands for A And R Loan Facility Debt Portion.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AAndRLoanFacilityDebtPortionMember_1" xml:lang="en-US">A And R Loan Facility Debt Portion [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AAndRLoanFacilityDebtPortionMember_2" xml:lang="en-US">A&amp;R Loan Facility Debt Portion [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AAndRLoanFacilityDerivativePortionMember_0" xml:lang="en-US">This member stands for A And R Loan Facility DerivativePortion.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AAndRLoanFacilityDerivativePortionMember_1" xml:lang="en-US">A And R Loan Facility Derivative Portion [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AAndRLoanFacilityDerivativePortionMember_2" xml:lang="en-US">A&amp;R Loan Facility Derivative Portion [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AAndRLoanFacilityMember_0" xml:lang="en-US">This member stand for A&amp;R Loan Facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AAndRLoanFacilityMember_1" xml:lang="en-US">A And R Loan Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AAndRLoanFacilityMember_2" xml:lang="en-US">A&amp;R Loan Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AccelerationQualityOfWarrantsIssued_0" xml:lang="en-US">Acceleration Quality Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AccelerationQualityOfWarrantsIssued_1" xml:lang="en-US">Acceleration Quality Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AccelerationQualityOfWarrantsIssued_2" xml:lang="en-US">Acceleration quality of warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AccountsReceivableRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Accounts Receivable Recognised As Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AccountsReceivableRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Accounts receivable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AccretionExpenses_0" xml:lang="en-US">Accretion Expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AccruedFees_0" xml:lang="en-US">Amount of accrued fees.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AccruedFees_1" xml:lang="en-US">Accrued Fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AccruedFees_2" xml:lang="en-US">Accrued fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AccruedInterestIncludedInAccountsPayable_0" xml:lang="en-US">The amount of accrued interest included in accounts payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_AccruedInterestIncludedInAccountsPayable_1" xml:lang="en-US">Less: Accrued interest included in accounts payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AccruedInterestIncludedInAccountsPayable_2" xml:lang="en-US">Accrued Interest Included In Accounts Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AccruedInterestIncludedInAccountsPayable_3" xml:lang="en-US">Less: Accrued interest included in accounts payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AccumulatedDepletionRoyaltyAndStreamInterests_0" xml:lang="en-US">Accumulated depletion Royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_AccumulatedDepletionRoyaltyAndStreamInterests_1" xml:lang="en-US">Accumulated depletion and impairments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AccumulatedDepletionRoyaltyAndStreamInterests_2" xml:lang="en-US">Accumulated Depletion Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AcquisitionCostsForRoyaltyInterests_0" xml:lang="en-US">Acquisition costs for royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AcquisitionCostsForRoyaltyInterests_1" xml:lang="en-US">Acquisition Costs For Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AcquisitionCostsForRoyaltyInterests_2" xml:lang="en-US">Acquisition costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AcquisitionPayables_0" xml:lang="en-US">The amount of outstanding acquisition payables.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_AcquisitionPayables_1" xml:lang="en-US">Trade and other payables recognised as of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AcquisitionPayables_2" xml:lang="en-US">Acquisition Payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AcquisitionPayables_3" xml:lang="en-US">Payables on acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AcquisitionPayables_4" xml:lang="en-US">Acquisition payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AcquisitionPricePerShare_0" xml:lang="en-US">Acquisition price per share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AcquisitionPricePerShare_1" xml:lang="en-US">Acquisition Price Per Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AcquisitionPricePerShare_2" xml:lang="en-US">Acquisition price per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AcquisitionsOfRoyaltiesAndStreamsMember_0" xml:lang="en-US">Represents payments related to acquisitions of royalties and streams member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AcquisitionsOfRoyaltiesAndStreamsMember_1" xml:lang="en-US">Acquisitions Of Royalties And Streams [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AcquisitionsOfRoyaltiesAndStreamsMember_2" xml:lang="en-US">Payments related to acquisition of royalties and streams [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdditionalConvertibleLoanFacilityToFundFutureAcquisitions_0" xml:lang="en-US">Represents amount of additional convertible loan facility to fund future acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdditionalConvertibleLoanFacilityToFundFutureAcquisitions_1" xml:lang="en-US">Additional Convertible Loan Facility To Fund Future Acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AdditionalConvertibleLoanFacilityToFundFutureAcquisitions_2" xml:lang="en-US">New total convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdditionalDrawDown_0" xml:lang="en-US">Represent the additional draw down.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdditionalDrawDown_1" xml:lang="en-US">Additional Draw Down</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AdditionalDrawDown_2" xml:lang="en-US">Additional draw down</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdditionalNetSmelterReturnPercentage_0" xml:lang="en-US">Additional net smelter return percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdditionalNetSmelterReturnPercentage_1" xml:lang="en-US">Additional Net Smelter Return Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AdditionalNetSmelterReturnPercentage_2" xml:lang="en-US">Additional net smelter return</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdditionalRoyaltyInterestAcquired_0" xml:lang="en-US">The additional percentage interest in the NSR royalty acquired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdditionalRoyaltyInterestAcquired_1" xml:lang="en-US">Additional Royalty Interest Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AdditionalRoyaltyInterestAcquired_2" xml:lang="en-US">C&#244;t&#233;-Gosselin NSR, additional interest acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdditionsToLoanPayable_0" xml:lang="en-US">Represents amount of additions to loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdditionsToLoanPayable_1" xml:lang="en-US">Additions To Loan Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AdditionsToLoanPayable_2" xml:lang="en-US">Additions to loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AdditionsToLoanPayable_3" xml:lang="en-US">Additions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdditionToLoanFacility_0" xml:lang="en-US">Addition to loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdditionToLoanFacility_1" xml:lang="en-US">Addition To Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AdditionToLoanFacility_2" xml:lang="en-US">Addition to loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdjustmentsForDepletionOnStreamInterest_0" xml:lang="en-US">Adjustments for depletion on stream interest to reconcile profit (loss) to net cash flow from (used in) operating activities.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdjustmentsForDepletionOnStreamInterest_1" xml:lang="en-US">Adjustments For Depletion On Stream Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AdjustmentsForDepletionOnStreamInterest_2" xml:lang="en-US">Depletion on stream interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AdjustmentsForDepletionOnStreamInterest_3" xml:lang="en-US">Depletion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AdjustmentsOfItemsNotAffectingCash_0" xml:lang="en-US">Amount of adjustments for items not affecting cash.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AdjustmentsOfItemsNotAffectingCash_1" xml:lang="en-US">Adjustments Of Items Not Affecting Cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_mta_AdjustmentsOfItemsNotAffectingCash_2" xml:lang="en-US">Total items not affecting cash before changes in non-cash working capital items</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AdjustmentsOfItemsNotAffectingCash_3" xml:lang="en-US">Adjustments of items not affecting cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AggregateCommissionsPaidOrPayableToAgents_0" xml:lang="en-US">Aggregate commissions paid or payable to agents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AggregateCommissionsPaidOrPayableToAgents_1" xml:lang="en-US">Aggregate Commissions Paid Or Payable To Agents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AggregateCommissionsPaidOrPayableToAgentsOtherShareIssueCosts_0" xml:lang="en-US">It represents as a aggregate commissions paid or payable to agents and other share issue costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AggregateCommissionsPaidOrPayableToAgentsOtherShareIssueCosts_1" xml:lang="en-US">Aggregate Commissions Paid Or Payable To Agents Other Share Issue Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AggregateCommissionsPaidOrPayableToAgentsOtherShareIssueCosts_2" xml:lang="en-US">Aggregate commissions paid or payable to agents and other share issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AggregateOriginationDiscount_0" xml:lang="en-US">Represents amount of aggregate origination discount.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AggregateOriginationDiscount_1" xml:lang="en-US">Aggregate Origination Discount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AggregateOriginationDiscount_2" xml:lang="en-US">Aggregate origination discount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AggregateValueOfAcquisitionsOfRoyaltyInterests_0" xml:lang="en-US">The amount of aggregate value of acquisitions of royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AggregateValueOfAcquisitionsOfRoyaltyInterests_1" xml:lang="en-US">Aggregate Value Of Acquisitions Of Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AggregateValueOfAcquisitionsOfRoyaltyInterests_2" xml:lang="en-US">Aggregate value of acquisitions of royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired_0" xml:lang="en-US">The amount of aggregate value of common shares and convertible debenture for net assets acquired, as non-cash investing and financing activities.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired_1" xml:lang="en-US">Aggregate Value Of Common Shares And Convertible Debenture For Net Assets Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired_2" xml:lang="en-US">Aggregate value of common shares and convertible debenture for net assets acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AgnicoEagleMinesLimitedMember_0" xml:lang="en-US">Agnico Eagle Mines Limited ("Agnico")</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AgnicoEagleMinesLimitedMember_1" xml:lang="en-US">Agnico Eagle Mines Limited [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AgnicoEagleMinesLimitedMember_2" xml:lang="en-US">Agnico Eagle Mines Limited ("Agnico")</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AgnicoEagleMinesLtdsAmalgamatedKirklandPropertyMember_0" xml:lang="en-US">Agnico Eagle Mines Ltd.'s Amalgamated Kirkland property.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AgnicoEagleMinesLtdsAmalgamatedKirklandPropertyMember_1" xml:lang="en-US">Agnico Eagle Mines Ltds Amalgamated Kirkland Property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AgnicoEagleMinesLtdsAmalgamatedKirklandPropertyMember_2" xml:lang="en-US">Agnico Eagle Mines Ltd.'s Amalgamated Kirkland property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AgreementAxis_0" xml:lang="en-US">The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AgreementAxis_1" xml:lang="en-US">Agreement [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AgreementDomain_0" xml:lang="en-US">It represents the standard value for the 'Agreement Axis.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AgreementDomain_1" xml:lang="en-US">Agreement [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AkasabaWestAcquisitionMember_0" xml:lang="en-US">Akasaba West acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AkasabaWestAcquisitionMember_1" xml:lang="en-US">Akasaba West Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AkasabaWestAcquisitionMember_2" xml:lang="en-US">Akasaba West acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AlamosAcquisitionsMember_0" xml:lang="en-US">Alamos acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AlamosAcquisitionsMember_1" xml:lang="en-US">Alamos Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AlamosAcquisitionsMember_2" xml:lang="en-US">Alamos portfolio acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AlamosAcquisitionsMember_3" xml:lang="en-US">Alamos Royalty Portfolio Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AlamosGoldCorpAcquisitionMember_0" xml:lang="en-US">It represents as a Alamos Gold Corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AlamosGoldCorpAcquisitionMember_1" xml:lang="en-US">Alamos Gold Corp Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AlamosRoyaltyInterestsMember_0" xml:lang="en-US">Alamos royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AlamosRoyaltyInterestsMember_1" xml:lang="en-US">Alamos Royalty Interests [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AlamosRoyaltyInterestsMember_2" xml:lang="en-US">Alamos Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AllocationOfConversionFeature_0" xml:lang="en-US">Represents Allocation of conversion feature during the period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_AllocationOfConversionFeature_1" xml:lang="en-US">Allocation of conversion feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AllocationOfConversionFeature_2" xml:lang="en-US">Allocation Of Conversion Feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AllocationOfConversionFeature_3" xml:lang="en-US">Allocation of conversion feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/commentaryGuidance" xlink:label="lab_mta_AllowanceForDoubtfulAccounts_0" xml:lang="en-US">This element should be used to tag non-restated comparative information only.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AllowanceForDoubtfulAccounts_1" xml:lang="en-US">Represents the amount of allowance for doubtful accounts.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_mta_AllowanceForDoubtfulAccounts_2" xml:lang="en-US">Allowance account for credit losses of financial assets at end of period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_mta_AllowanceForDoubtfulAccounts_3" xml:lang="en-US">Allowance account for credit losses of financial assets at beginning of period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AllowanceForDoubtfulAccounts_4" xml:lang="en-US">Allowance For Doubtful Accounts</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AllowanceForDoubtfulAccounts_5" xml:lang="en-US">Allowance for doubtful accounts</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmalgamatedKirklandAcquisitionMember_0" xml:lang="en-US">Amalgamated Kirkland Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmalgamatedKirklandAcquisitionMember_1" xml:lang="en-US">Amalgamated Kirkland Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AmalgamatedKirklandAcquisitionMember_2" xml:lang="en-US">Amalgamated Kirkland acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmendedFacilityMember_0" xml:lang="en-US">This member stands for Amended Facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmendedFacilityMember_1" xml:lang="en-US">Amended Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AmendedFacilityMember_2" xml:lang="en-US">Amended Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmendedLoanFacilityMember_0" xml:lang="en-US">Amended Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmendedLoanFacilityMember_1" xml:lang="en-US">Amended Loan Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AmendedLoanFacilityMember_2" xml:lang="en-US">Loan Amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmendmentFee_0" xml:lang="en-US">Amount of amendment fee.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmendmentFee_1" xml:lang="en-US">Amendment Fee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AmendmentFee_2" xml:lang="en-US">Amendment fee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmountOfAdditionalInterestAcquired_0" xml:lang="en-US">Represents amount of additional interest acquired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmountOfAdditionalInterestAcquired_1" xml:lang="en-US">Amount Of Additional Interest Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AmountOfAdditionalInterestAcquired_2" xml:lang="en-US">Additional interest acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmountOfNetSmelterReturnCapped_0" xml:lang="en-US">It represents amount of net smelter return capped.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmountOfNetSmelterReturnCapped_1" xml:lang="en-US">Amount Of Net Smelter Return Capped</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AmountOfNetSmelterReturnCapped_2" xml:lang="en-US">Amount of net smelter return capped</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmountOfOriginalDebtConverted_0" xml:lang="en-US">Represents the amount of original debt outstanding converted to equity.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmountOfOriginalDebtConverted_1" xml:lang="en-US">Amount Of Original Debt Converted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AmountOfOriginalDebtConverted_2" xml:lang="en-US">Amount of loan outstanding converted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AmountPaidOnSigningOfAgreement_0" xml:lang="en-US">Represents amount paid on at the time of signing of agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AmountPaidOnSigningOfAgreement_1" xml:lang="en-US">Amount Paid On Signing Of Agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AmountPaidOnSigningOfAgreement_2" xml:lang="en-US">Amount Paid on signing of agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AnglozekeMember_0" xml:lang="en-US">Anglo/Zeke [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AnglozekeMember_1" xml:lang="en-US">Anglozeke [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AranzazuMember_0" xml:lang="en-US">Aranzazu [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ArrangementAgreementMember_0" xml:lang="en-US">Information related to arrangement agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ArrangementAgreementMember_1" xml:lang="en-US">Arrangement Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AtMarketAggregateCommissionsPaidOrPayableToAgentsAndOtherShareIssueCosts_0" xml:lang="en-US">ATM aggregate commissions paid or payable to agents and other share issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AtMarketAggregateCommissionsPaidOrPayableToAgentsAndOtherShareIssueCosts_1" xml:lang="en-US">At Market Aggregate Commissions Paid Or Payable To Agents And Other Share Issue Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AtMarketAggregateCommissionsPaidOrPayableToAgentsAndOtherShareIssueCosts_2" xml:lang="en-US">ATM aggregate commissions paid or payable to agents and other share issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AtMarketAverageSharePrice_0" xml:lang="en-US">At-The-Market average share price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AtMarketAverageSharePrice_1" xml:lang="en-US">At Market Average Share Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AtMarketAverageSharePrice_2" xml:lang="en-US">ATM average share price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AtMarketGrossProceeds_0" xml:lang="en-US">ATM gross proceeds</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AtMarketGrossProceeds_1" xml:lang="en-US">At Market Gross Proceeds</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AtMarketGrossProceeds_2" xml:lang="en-US">ATM gross proceeds</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AtMarketOtherShareIssueCosts_0" xml:lang="en-US">At market other share issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AtMarketOtherShareIssueCosts_1" xml:lang="en-US">At Market Other Share Issue Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AtMarketOtherShareIssueCosts_2" xml:lang="en-US">At market other share issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AverageGradeOfGoldGramPerTonne_0" xml:lang="en-US">It represents average grade of gold gram per tonne.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AverageGradeOfGoldGramPerTonne_1" xml:lang="en-US">Average Grade Of Gold Gram Per Tonne</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_AverageGradeOfGoldGramPerTonne_2" xml:lang="en-US">Average grade of gold (in gram per tonne)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_AverageSharePrice_0" xml:lang="en-US">Represent the average share price.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_AverageSharePrice_1" xml:lang="en-US">Average Share Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_AverageSharePrice_2" xml:lang="en-US">Average share price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BarrickMember_0" xml:lang="en-US">Barrick [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BeauforAmendment_0" xml:lang="en-US">Represent the amount of beaufor amendment.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BeauforAmendment_1" xml:lang="en-US">Beaufor Amendment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BeauforMember_0" xml:lang="en-US">this member stands for Beaufor.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BeauforMember_1" xml:lang="en-US">Beaufor [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_BeauforMember_2" xml:lang="en-US">Beaufor amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BeedieCapitalMember_0" xml:lang="en-US">Beedie Capital ("Beedie")</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BeedieCapitalMember_1" xml:lang="en-US">Beedie Capital [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_BeedieCapitalMember_2" xml:lang="en-US">Beedie Capital ("Beedie") [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BigSpringsMember_0" xml:lang="en-US">Big Springs [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BigSpringsMember_1" xml:lang="en-US">Big Springs [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BiricuMember_0" xml:lang="en-US">Biricu [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BiricuMember_1" xml:lang="en-US">Biricu [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BorrowingApplicableMarginRate_0" xml:lang="en-US">Represents applicable margin rate of borrowing.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BorrowingApplicableMarginRate_1" xml:lang="en-US">Borrowing Applicable Margin Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_BorrowingApplicableMarginRate_2" xml:lang="en-US">Applicable margin rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BorrowingsBeforeAccruedInterestIncludedInAccountsPayable_0" xml:lang="en-US">The amount of outstanding funds that the entity is obligated to repay before accrued interest included in accounts payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_mta_BorrowingsBeforeAccruedInterestIncludedInAccountsPayable_1" xml:lang="en-US">Ending balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BorrowingsBeforeAccruedInterestIncludedInAccountsPayable_2" xml:lang="en-US">Borrowings Before Accrued Interest Included In Accounts Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BusinessCombinationCashPaidOnClosing_0" xml:lang="en-US">Represents the amount of cash paid on closing as consideration in business combination.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BusinessCombinationCashPaidOnClosing_1" xml:lang="en-US">Business Combination, Cash Paid On Closing</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_BusinessCombinationCashPaidOnClosing_2" xml:lang="en-US">Cash paid on closing</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_BuyBackRightPercentage_0" xml:lang="en-US">Percentage for buy-back right.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_BuyBackRightPercentage_1" xml:lang="en-US">Buy Back Right Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_BuyBackRightPercentage_2" xml:lang="en-US">Buy-back right percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CalderaMember_0" xml:lang="en-US">Caldera [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CalderaMember_1" xml:lang="en-US">Caldera [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CapOesteSurEastAcquisitionMember_0" xml:lang="en-US">Cap-Oeste Sur East acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CapOesteSurEastAcquisitionMember_1" xml:lang="en-US">Cap Oeste Sur East Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CapOesteSurEastAcquisitionMember_2" xml:lang="en-US">Cap-Oeste Sur East acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CashAndCommonSharesPaid_0" xml:lang="en-US">Represents amount of cash and common shares paid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CashAndCommonSharesPaid_1" xml:lang="en-US">Cash And Common Shares Paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CashAndCommonSharesPaid_2" xml:lang="en-US">Cash and common shares paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CashConsiderationPaidForRoyaltyInterest_0" xml:lang="en-US">The cash consideration paid to acquire an additional interest in the NSR royalty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CashConsiderationPaidForRoyaltyInterest_1" xml:lang="en-US">Cash Consideration Paid For Royalty Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CashConsiderationPaidForRoyaltyInterest_2" xml:lang="en-US">C&#244;t&#233;-Gosselin NSR, cash consideration</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfDerivativeRoyaltyAsset_0" xml:lang="en-US">Represents the amount of acquisition of derivative royalty asset.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfDerivativeRoyaltyAsset_1" xml:lang="en-US">Acquisition of derivative royalty asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfDerivativeRoyaltyAsset_2" xml:lang="en-US">Cash Flows Used For Acquisitions Of Derivative Royalty Asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfDerivativeRoyaltyAsset_3" xml:lang="en-US">Acquisition of derivative royalty asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests_0" xml:lang="en-US">The aggregate cash flows used in acquisitions of royalty and stream interests, classified as investing activities.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests_1" xml:lang="en-US">Acquisitions of royalty and stream interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests_2" xml:lang="en-US">Cash Flows Used For Acquisitions Of Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests_3" xml:lang="en-US">Purchase price of acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CashPaidInSubsequentEvent_0" xml:lang="en-US">Represent the amount of cash paid in subsequent event.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CashPaidInSubsequentEvent_1" xml:lang="en-US">Cash Paid In Subsequent Event</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CashPaidInSubsequentEvent_2" xml:lang="en-US">Cash paid in subsequent event</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CastleMountainAcquisitionMember_0" xml:lang="en-US">This member stands for Castle Mountain acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CastleMountainAcquisitionMember_1" xml:lang="en-US">Castle Mountain Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CastleMountainAcquisitionMember_2" xml:lang="en-US">Castle Mountain acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CastleMountainLoanMember_0" xml:lang="en-US">Castle Mountain Loan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CastleMountainLoanMember_1" xml:lang="en-US">Castle Mountain Loan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CatchUpDepletionCharge_0" xml:lang="en-US">Catch up depletion charge</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CatchUpDepletionCharge_1" xml:lang="en-US">Catch Up Depletion Charge</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CatchUpDepletionCharge_2" xml:lang="en-US">Catch-up depletion charge</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CategoriesOfRoyaltyStreamsAndInterestsAxis_0" xml:lang="en-US">Categories of Royalty, streams and interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CategoriesOfRoyaltyStreamsAndInterestsAxis_1" xml:lang="en-US">Categories Of Royalty, Streams And Interests [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CategoriesOfRoyaltyStreamsAndInterestsDomain_0" xml:lang="en-US">Categories of Royalty, streams and interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CategoriesOfRoyaltyStreamsAndInterestsDomain_1" xml:lang="en-US">Categories Of Royalty, Streams And Interests [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CentrogoldAcquisitionMember_0" xml:lang="en-US">CentroGold Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CentrogoldAcquisitionMember_1" xml:lang="en-US">Centrogold Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CentrogoldAcquisitionMember_2" xml:lang="en-US">CentroGold acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ChangesInNonCashWorkingCapitalItemsAbstract_0" xml:lang="en-US">Changes In Non Cash Working Capital Items [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ChangesInNonCashWorkingCapitalItemsAbstract_1" xml:lang="en-US">Changes in non-cash working capital items:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoeurAcquisitionsMember_0" xml:lang="en-US">Coeur acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoeurAcquisitionsMember_1" xml:lang="en-US">Coeur Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CoeurAcquisitionsMember_2" xml:lang="en-US">Coeur acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoeurDebentureMember_0" xml:lang="en-US">This member stands for Coeur Debenture.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoeurDebentureMember_1" xml:lang="en-US">Coeur Debenture [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CoeurDebentureMember_2" xml:lang="en-US">Coeur debenture</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoeurStreamAndRoyaltyInterestsMember_0" xml:lang="en-US">Coeur stream and royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoeurStreamAndRoyaltyInterestsMember_1" xml:lang="en-US">Coeur Stream And Royalty Interests [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CoeurStreamAndRoyaltyInterestsMember_2" xml:lang="en-US">Coeur stream and royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CommitmentsLineItems_0" xml:lang="en-US">Commitments [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CommitmentsTable_0" xml:lang="en-US">Commitments [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CommonSharesIssuedForAcquisitionsOfRoyaltyInterests_0" xml:lang="en-US">Value of common shares issued for acquisitions of royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CommonSharesIssuedForAcquisitionsOfRoyaltyInterests_1" xml:lang="en-US">Common shares issued for acquisitions of royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CommonSharesIssuedForAcquisitionsOfRoyaltyInterests_2" xml:lang="en-US">Common shares issued for acquisitions of royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CompensationAndBenefits_0" xml:lang="en-US">The amount of compensation and benefits paid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CompensationAndBenefits_1" xml:lang="en-US">Compensation And Benefits</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CompensationAndBenefits_2" xml:lang="en-US">Compensation and benefits</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConditionalAmountPayableUponAchievementOfCertainMilestones_0" xml:lang="en-US">Represents conditional amount payable upon achievement of certain milestones.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConditionalAmountPayableUponAchievementOfCertainMilestones_1" xml:lang="en-US">Conditional Amount Payable Upon Achievement Of Certain Milestones</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConditionalAmountPayableUponAchievementOfCertainMilestones_2" xml:lang="en-US">Conditional amount payable upon achievement of certain milestones</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConditionsAxis_0" xml:lang="en-US">Conditions [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConditionsAxis_1" xml:lang="en-US">Conditions [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConditionsDomain_0" xml:lang="en-US">Conditions [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConditionsDomain_1" xml:lang="en-US">Conditions [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ContingentPaymentForConsiderationForLoanAgreement_0" xml:lang="en-US">Represents amount of contingent payment for consideration for loan agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ContingentPaymentForConsiderationForLoanAgreement_1" xml:lang="en-US">Contingent Payment For Consideration For Loan Agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ContingentPaymentForConsiderationForLoanAgreement_2" xml:lang="en-US">Contingent payment for consideration for loan agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConversionLoansPayable_0" xml:lang="en-US">Represents conversion of loans payable during the period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_ConversionLoansPayable_1" xml:lang="en-US">Conversion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConversionLoansPayable_2" xml:lang="en-US">Conversion Loans Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConversionLoansPayable_3" xml:lang="en-US">Conversion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConversionOfLoanFacilityConvertedAmount_0" xml:lang="en-US">Represents the amount of convertible loan facility converted into shares.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConversionOfLoanFacilityConvertedAmount_1" xml:lang="en-US">Conversion Of Loan Facility Converted Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConversionOfLoanFacilityConvertedAmount_2" xml:lang="en-US">Conversion of loan facility, converted amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConversionOfLoanFacilityConvertedToShares_0" xml:lang="en-US">Represents fee is convertible into common shares.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConversionOfLoanFacilityConvertedToShares_1" xml:lang="en-US">Conversion Of Loan Facility, Converted To Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConversionOfLoanFacilityConvertedToShares_2" xml:lang="en-US">Conversion of loan facility, shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConversionPrice_0" xml:lang="en-US">Represent the conversion price.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConversionPrice_1" xml:lang="en-US">Conversion Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConversionPriceOfDebt_0" xml:lang="en-US">Represents the amount per share of conversion price of debt.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConversionPriceOfDebt_1" xml:lang="en-US">Conversion Price Of Debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ConversionPriceOfDebt_2" xml:lang="en-US">Conversion price of debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConversionPricePerShare_0" xml:lang="en-US">Represents conversion price per share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConversionPricePerShare_1" xml:lang="en-US">Conversion Price Per Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ConversionPricePerShare_2" xml:lang="en-US">Conversion price per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleDebenturePayable_0" xml:lang="en-US">Convertible debenture payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleDebenturePayable_1" xml:lang="en-US">Convertible Debenture Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConvertibleDebenturePayable_2" xml:lang="en-US">Convertible debenture</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ConvertibleDebenturePayable_3" xml:lang="en-US">Convertible debenture payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacility_0" xml:lang="en-US">Represents the amount of convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacility_1" xml:lang="en-US">Convertible Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ConvertibleLoanFacility_2" xml:lang="en-US">Convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInEquityReserves_0" xml:lang="en-US">Convertible Loan Facility Converted Amount Derecognized In Equity Reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInEquityReserves_1" xml:lang="en-US">Convertible Loan Facility Converted Amount Derecognized In Equity Reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInEquityReserves_2" xml:lang="en-US">Convertible loan facility, converted amount derecognized in equity reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInLiability_0" xml:lang="en-US">Convertible Loan Facility Converted Amount Derecognized in Liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInLiability_1" xml:lang="en-US">Convertible Loan Facility Converted Amount Derecognized In Liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInLiability_2" xml:lang="en-US">Convertible loan facility, converted amount derecognized in liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInShareCapital_0" xml:lang="en-US">Convertible Loan Facility Converted Amount Derecognized In Share Capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInShareCapital_1" xml:lang="en-US">Convertible Loan Facility Converted Amount Derecognized In Share Capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityConvertedAmountDerecognizedInShareCapital_2" xml:lang="en-US">Convertible loan facility, converted amount derecognized in share capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityDrawdownAxis_0" xml:lang="en-US">Information by category of drawdown details of the convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityDrawdownAxis_1" xml:lang="en-US">Convertible Loan Facility Drawdown [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityDrawdownDomain_0" xml:lang="en-US">Represents the drawdown details of the convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityDrawdownDomain_1" xml:lang="en-US">Convertible Loan Facility Drawdown [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityDrewDown_0" xml:lang="en-US">The amount of convertible loan facility drew down.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityDrewDown_1" xml:lang="en-US">Convertible Loan Facility Drew Down</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityDrewDown_2" xml:lang="en-US">Initial advance drew down on facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityMember_0" xml:lang="en-US">Represents information of convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityMember_1" xml:lang="en-US">Convertible Loan Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityMember_2" xml:lang="en-US">Convertible loan facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityRemainingDrewDownFromOriginalLoanFacility_0" xml:lang="en-US">Represents amount of remaining draw down from the original loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityRemainingDrewDownFromOriginalLoanFacility_1" xml:lang="en-US">Convertible Loan Facility Remaining Drew Down From Original Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityRemainingDrewDownFromOriginalLoanFacility_2" xml:lang="en-US">Remaining drew down from original loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ConvertibleLoanFacilityRemainingUndrawnAvailableFromOriginalLoanFacility_0" xml:lang="en-US">Convertible Loan Facility Remaining Undrawn Available From Original Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ConvertibleLoanFacilityRemainingUndrawnAvailableFromOriginalLoanFacility_1" xml:lang="en-US">Convertible Loan Facility Remaining Undrawn Available From Original Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ConvertibleLoanFacilityRemainingUndrawnAvailableFromOriginalLoanFacility_2" xml:lang="en-US">Remaining undrawn available from original loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CopperWorldComplexMember_0" xml:lang="en-US">This member stands for Copper World Complex.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CopperWorldComplexMember_1" xml:lang="en-US">Copper World Complex [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CopperWorldComplexMember_2" xml:lang="en-US">Copper World Complex [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CorporateAdministration_0" xml:lang="en-US">The amount of corporate administration paid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CorporateAdministration_1" xml:lang="en-US">Corporate Administration</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CorporateAdministration_2" xml:lang="en-US">Corporate administration</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoseAcquisitionsMember_0" xml:lang="en-US">COSE acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoseAcquisitionsMember_1" xml:lang="en-US">Cose Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CoseAcquisitionsMember_2" xml:lang="en-US">COSE acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoseMember_0" xml:lang="en-US">This member stands for COSE.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoseMember_1" xml:lang="en-US">Cose [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CoseMember_2" xml:lang="en-US">COSE reclassification [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_COSERoyaltyMember_0" xml:lang="en-US">Represents cose royalty member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_COSERoyaltyMember_1" xml:lang="en-US">C O S E Royalty [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_COSERoyaltyMember_2" xml:lang="en-US">COSE [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoteGosselinAcquisitionMember_0" xml:lang="en-US">This member stands for Cote-Gosselin acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoteGosselinAcquisitionMember_1" xml:lang="en-US">Cote Gosselin Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CoteGosselinAcquisitionMember_2" xml:lang="en-US">C&#244;t&#233;-Gosselin acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CoteGosselinAcquisitionRoyaltyAndStreamInterests_0" xml:lang="en-US">Amount of Cote Gosselin acquisition in royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CoteGosselinAcquisitionRoyaltyAndStreamInterests_1" xml:lang="en-US">Cote Gosselin Acquisition, Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CoteGosselinAcquisitionRoyaltyAndStreamInterests_2" xml:lang="en-US">C&#244;t&#233;-Gosselin acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CreditSpreadAdjustment_0" xml:lang="en-US">Credit spread adjustment.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CreditSpreadAdjustment_1" xml:lang="en-US">Credit Spread Adjustment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CreditSpreadAdjustment_2" xml:lang="en-US">Credit spread adjustment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CumulativeGoldOunces_0" xml:lang="en-US">Cumulative gold ounces.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CumulativeGoldOunces_1" xml:lang="en-US">Cumulative Gold Ounces</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CumulativeGoldOunces_2" xml:lang="en-US">Cumulative gold ounces</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CurrencyTranslationAdjustmentsRelatedToBorrowings_0" xml:lang="en-US">Represents amount of currency translation adjustments related to borrowing.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CurrencyTranslationAdjustmentsRelatedToBorrowings_1" xml:lang="en-US">Currency Translation Adjustments Related To Borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_CurrencyTranslationAdjustmentsRelatedToBorrowings_2" xml:lang="en-US">Foreign exchange adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_CurrencyTranslationAdjustmentsRelatedToBorrowings_3" xml:lang="en-US">Currency translation adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_CurrentLiabilitiesOtherThanLoans_0" xml:lang="en-US">Represents the amount of current liabilities other than loans.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_CurrentLiabilitiesOtherThanLoans_1" xml:lang="en-US">Current Liabilities Other Than Loans</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_mta_CurrentLiabilitiesOtherThanLoans_2" xml:lang="en-US">Current liabilities other than loans</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DeferredCashConsiderationPayableInSubsequentEvent_0" xml:lang="en-US">Represent the amount of deferred cash consideration payable in subsequent event.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DeferredCashConsiderationPayableInSubsequentEvent_1" xml:lang="en-US">Deferred Cash Consideration Payable In Subsequent Event</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DeferredCashConsiderationPayableInSubsequentEvent_2" xml:lang="en-US">Deferred cash consideration payable in subsequent event</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DeferredIncomeTaxExpenseToOffsetEquityReserves_0" xml:lang="en-US">Deferred Income Tax Expense to offset equity reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DeferredIncomeTaxExpenseToOffsetEquityReserves_1" xml:lang="en-US">Deferred Income Tax Expense To Offset Equity Reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DeferredIncomeTaxExpenseToOffsetEquityReserves_2" xml:lang="en-US">Deferred income tax expense to offset equity reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DeferredTaxAssets1_0" xml:lang="en-US">The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_DeferredTaxAssets1_1" xml:lang="en-US">Deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DeferredTaxAssets1_2" xml:lang="en-US">Deferred Tax Assets1</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DeferredTaxAssets1_3" xml:lang="en-US">Deferred income tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_mta_DeferredTaxAssets1_4" xml:lang="en-US">Deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DeferredTaxAssets1_5" xml:lang="en-US">Deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DeferredTaxAssetsAbstract_0" xml:lang="en-US">Deferred Tax Assets [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DeferredTaxAssetsAbstract_1" xml:lang="en-US">Deferred tax assets:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DeferredTaxLiabilities1_0" xml:lang="en-US">The amounts of income taxes payable in future periods in respect of taxable temporary differences.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_DeferredTaxLiabilities1_1" xml:lang="en-US">Deferred tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DeferredTaxLiabilities1_2" xml:lang="en-US">Deferred Tax Liabilities1</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DeferredTaxLiabilities1_3" xml:lang="en-US">Deferred income tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DeferredTaxLiabilities1_4" xml:lang="en-US">Deferred tax liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DeferredTaxLiabilityRelatedToTaxableTemporaryDifferenceArisingFromEquityPortion_0" xml:lang="en-US">Represents deferred tax liability related to taxable temporary difference arising from equity portion.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DeferredTaxLiabilityRelatedToTaxableTemporaryDifferenceArisingFromEquityPortion_1" xml:lang="en-US">Deferred Tax Liability Related To Taxable Temporary Difference Arising From Equity Portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DeferredTaxLiabilityRelatedToTaxableTemporaryDifferenceArisingFromEquityPortion_2" xml:lang="en-US">Deferred tax liability related to taxable temporary difference arising from equity portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DelCarmenAcquisitionMember_0" xml:lang="en-US">Del Carmen Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DelCarmenAcquisitionMember_1" xml:lang="en-US">Del Carmen Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DelCarmenAcquisitionMember_2" xml:lang="en-US">Del Carmen and Beaufor impairments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DelCarmenAcquisitionMember_3" xml:lang="en-US">Del Carmen acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DelCarmenRoyaltyMember_0" xml:lang="en-US">This member stands for Del Carmen royalty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DelCarmenRoyaltyMember_1" xml:lang="en-US">Del Carmen Royalty [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DelToroMineMember_0" xml:lang="en-US">Del Toro Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DelToroMineMember_1" xml:lang="en-US">Del Toro Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DepletionOfRoyaltyAndStreamInterests_0" xml:lang="en-US">Depletion of Royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_DepletionOfRoyaltyAndStreamInterests_1" xml:lang="en-US">Depletion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DepletionOfRoyaltyAndStreamInterests_2" xml:lang="en-US">Depletion Of Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DepletionOfRoyaltyAndStreamInterests_3" xml:lang="en-US">Depletion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DepletionOnRoyaltyInterests_0" xml:lang="en-US">The amount represents of depletion on royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_DepletionOnRoyaltyInterests_1" xml:lang="en-US">Depletion on royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DepletionOnRoyaltyInterests_2" xml:lang="en-US">Depletion on royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DepletionOnRoyaltyInterests_3" xml:lang="en-US">Depletion On Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DepletionOnRoyaltyInterests_4" xml:lang="en-US">Depletion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DepletionOnStreamInterest_0" xml:lang="en-US">The amount of expenses arising form depletion on stream interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_DepletionOnStreamInterest_1" xml:lang="en-US">Depletion on royalty and stream interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:label="lab_mta_DepletionOnStreamInterest_2" xml:lang="en-US">Depletion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DepletionOnStreamInterest_3" xml:lang="en-US">Depletion On Stream Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DepletionOnStreamInterest_4" xml:lang="en-US">Depletion on stream interest (Note 4)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DepletionOnStreamInterest_5" xml:lang="en-US">Depletion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DerivativeAssetUponInception_0" xml:lang="en-US">Derivative asset upon inception.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DerivativeAssetUponInception_1" xml:lang="en-US">Derivative Asset Upon Inception</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DerivativeAssetUponInception_2" xml:lang="en-US">Derivative asset upon inception</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DerivativeRoyaltyAssetAbstract_0" xml:lang="en-US">Derivative Royalty Asset [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DerivativeRoyaltyAssetAdditions_0" xml:lang="en-US">Amount of additions to derivative royalty asset.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DerivativeRoyaltyAssetAdditions_1" xml:lang="en-US">Derivative Royalty Asset Additions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DerivativeRoyaltyAssetAdditions_2" xml:lang="en-US">Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DerivativeRoyaltyAssetCurrent_0" xml:lang="en-US">Represents the derivative royalty asset, current.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DerivativeRoyaltyAssetCurrent_1" xml:lang="en-US">Derivative Royalty Asset, Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DesantisPropertiesMember_0" xml:lang="en-US">DeSantis properties.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DesantisPropertiesMember_1" xml:lang="en-US">Desantis Properties [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DesantisPropertiesMember_2" xml:lang="en-US">DeSantis properties</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPolicyForChangeInAccountingPolicyExplanatory_0" xml:lang="en-US">The description of the entity's accounting policy for change in accounting policy.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPolicyForChangeInAccountingPolicyExplanatory_1" xml:lang="en-US">Description Of Accounting Policy For Change In Accounting Policy Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DescriptionOfAccountingPolicyForChangeInAccountingPolicyExplanatory_2" xml:lang="en-US">Adoption of New Accounting Standards [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPolicyForCovidNineteenUncertaintyExplanatory_0" xml:lang="en-US">The description of the entity's accounting policy for covid 19 uncertainty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPolicyForCovidNineteenUncertaintyExplanatory_1" xml:lang="en-US">Description Of Accounting Policy For Covid Nineteen Uncertainty Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPolicyForFutureChangesToAccountingPoliciesExplanatory_0" xml:lang="en-US">The description of the entity's accounting policy for future changes to accounting policies.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPolicyForFutureChangesToAccountingPoliciesExplanatory_1" xml:lang="en-US">Description Of Accounting Policy For Future Changes To Accounting Policies Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DescriptionOfAccountingPolicyForFutureChangesToAccountingPoliciesExplanatory_2" xml:lang="en-US">Future Changes to Accounting Policies [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPolicyForNewAccountingStandardsIssuedButNotYetEffectiveWhichAreApplicableExplanatory_0" xml:lang="en-US">The description of the entity's accounting policy for new accounting standards issued but not yet effective which are applicable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPolicyForNewAccountingStandardsIssuedButNotYetEffectiveWhichAreApplicableExplanatory_1" xml:lang="en-US">Description Of Accounting Policy For New Accounting Standards Issued But Not Yet Effective Which Are Applicable Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DescriptionOfAccountingPolicyForNewAccountingStandardsIssuedButNotYetEffectiveWhichAreApplicableExplanatory_2" xml:lang="en-US">New accounting standards issued but not yet effective which are applicable to the Company [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatory_0" xml:lang="en-US">The description of the entity's accounting policy for royalty, stream, and other interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatory_1" xml:lang="en-US">Description Of Accounting Policy For Royalty, Stream, And Other Interests Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatory_2" xml:lang="en-US">Royalty, Stream, and Other Interests [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPolicyForStatementOfComplianceExplanatory_0" xml:lang="en-US">The description of the entity's accounting policy for statement of compliance.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPolicyForStatementOfComplianceExplanatory_1" xml:lang="en-US">Description Of Accounting Policy For Statement Of Compliance Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DescriptionOfAccountingPolicyForStatementOfComplianceExplanatory_2" xml:lang="en-US">Statement of Compliance [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingPronouncementsNotYetEffectiveExplanatory_0" xml:lang="en-US">Information related to accounting pronouncements not yet effective.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingPronouncementsNotYetEffectiveExplanatory_1" xml:lang="en-US">Description Of Accounting Pronouncements Not Yet Effective Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DescriptionOfAccountingPronouncementsNotYetEffectiveExplanatory_2" xml:lang="en-US">Accounting pronouncements not yet effective</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfAccountingStandardsAdoptedDuringYearExplanatory_0" xml:lang="en-US">The disclosure of accounting standards adopted during the year.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfAccountingStandardsAdoptedDuringYearExplanatory_1" xml:lang="en-US">Description Of Accounting Standards Adopted During Year Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DescriptionOfAccountingStandardsAdoptedDuringYearExplanatory_2" xml:lang="en-US">Accounting standards adopted during the year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfKeyAssumptionsUsedInCashFlowForecast_0" xml:lang="en-US">Represent the description of Key assumptions used in cash flow forecast .</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfKeyAssumptionsUsedInCashFlowForecast_1" xml:lang="en-US">Description Of Key Assumptions Used In Cash Flow Forecast</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DescriptionOfKeyAssumptionsUsedInCashFlowForecast_2" xml:lang="en-US">Description of key assumptions used in cash flow forecast</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfLoanMaturityTerm_0" xml:lang="en-US">Represents about loan maturity term.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfLoanMaturityTerm_1" xml:lang="en-US">Description Of Loan Maturity Term</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DescriptionOfLoanMaturityTerm_2" xml:lang="en-US">Loan maturity term</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DescriptionOfShareConsolidationBasis_0" xml:lang="en-US">Represents information related to share consolidation basis.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DescriptionOfShareConsolidationBasis_1" xml:lang="en-US">Description Of Share Consolidation Basis</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DescriptionOfShareConsolidationBasis_2" xml:lang="en-US">Description of share consolidation basis</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DevelopmentAssetsMember_0" xml:lang="en-US">Development Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DevelopmentAssetsMember_1" xml:lang="en-US">Development Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DevelopmentAssetsMember_2" xml:lang="en-US">Development Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DirectorsAndManagementRelatedToPaymentOfWithholdingAmounts_0" xml:lang="en-US">Represents the amount of directors and management related to the payment of withholding amounts.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DirectorsAndManagementRelatedToPaymentOfWithholdingAmounts_1" xml:lang="en-US">Directors And Management Related To Payment Of Withholding Amounts</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DirectorsAndManagementRelatedToPaymentOfWithholdingAmounts_2" xml:lang="en-US">Directors and management related to payment of withholding amounts</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DirectorsMember_0" xml:lang="en-US">Person serving on the board of directors (who collectively have responsibility for governing the entity).</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DirectorsMember_1" xml:lang="en-US">Directors [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DirectorsMember_2" xml:lang="en-US">Directors</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfCommitmentAbstract_0" xml:lang="en-US">Disclosure Of Commitment [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfContractualCapitalCommitmentsExplanatory_0" xml:lang="en-US">Represents information related to contractual capital commitments.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfContractualCapitalCommitmentsExplanatory_1" xml:lang="en-US">Disclosure Of Contractual Capital Commitments Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfContractualCapitalCommitmentsExplanatory_2" xml:lang="en-US">Disclosure of detailed information about contractual obligations [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDerivativeRoyaltyAssetLineItems_0" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDerivativeRoyaltyAssetLineItems_1" xml:lang="en-US">Disclosure Of Derivative Royalty Asset [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDerivativeRoyaltyAssetTable_0" xml:lang="en-US">The disclosure of derivative royalty assets.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDerivativeRoyaltyAssetTable_1" xml:lang="en-US">Disclosure Of Derivative Royalty Asset [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutChangesInDerivativeRoyaltyAssetExplanatory_0" xml:lang="en-US">Disclosure of detailed information about changes in derivative royalty asset.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutChangesInDerivativeRoyaltyAssetExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About Changes In Derivative Royalty Asset Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutChangesInDerivativeRoyaltyAssetExplanatory_2" xml:lang="en-US">Disclosure of detailed information about changes in derivative royalty asset [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutCurrentAndDeferredIncomeTaxExpenseRecoveryRespectOfGeographicRegionsExplanatory_0" xml:lang="en-US">The disclosure of detailed information about current and deferred income tax expense (recovery) respect of geographic regions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutCurrentAndDeferredIncomeTaxExpenseRecoveryRespectOfGeographicRegionsExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About Current And Deferred Income Tax Expense (Recovery) Respect Of Geographic Regions Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutCurrentAndDeferredIncomeTaxExpenseRecoveryRespectOfGeographicRegionsExplanatory_2" xml:lang="en-US">Disclosure of detailed information about current and deferred income tax expense (recovery) respect of geographic regions [Table Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutGeneralAndAdministrativeExpenseExplanatory_0" xml:lang="en-US">Tabular disclosure of the components of general and administrative expense.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutGeneralAndAdministrativeExpenseExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About General And Administrative Expense Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutGeneralAndAdministrativeExpenseExplanatory_2" xml:lang="en-US">Disclosure of detailed information about general and administrative expense [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantory_0" xml:lang="en-US">The disclosure of additional information about net change in non-cash working capital items.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantory_1" xml:lang="en-US">Disclosure Of Detailed Information About Net Change In Non Cash Working Capital Items Explanantory</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatory_0" xml:lang="en-US">Disclosure Of Detailed Information About purchase price allocation for acquisition Explanatory.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About Purchase Price Allocation For Acquisition Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatory_2" xml:lang="en-US">Disclosure of detailed information about purchase price allocation for acquisition [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutRoyaltyInterestsAndDeferredAcquisitionCostsExplanatory_0" xml:lang="en-US">Disclosure Of Detailed Information About royalty interests and deferred acquisition costs explanatory.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutRoyaltyInterestsAndDeferredAcquisitionCostsExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About Royalty Interests And Deferred Acquisition Costs Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutRoyaltyInterestsAndDeferredAcquisitionCostsExplanatory_2" xml:lang="en-US">Disclosure of detailed information about royalty interests and deferred acquisition costs [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOtherPayablesExplanatory_0" xml:lang="en-US">DisclosureOfDetailedInformationAboutTradeAndOtherPayablesTableTextBlock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOtherPayablesExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About Trade And Other Payables Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOtherPayablesExplanatory_2" xml:lang="en-US">Disclosure of detailed information about trade and other payables [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatory_0" xml:lang="en-US">Tabular disclosure of the trade receivable and the gross carrying value, allowance, and net carrying value as of the balance sheet date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatory_1" xml:lang="en-US">Disclosure Of Detailed Information About Trade And Other Receivables Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatory_2" xml:lang="en-US">Disclosure of detailed information about accounts receivables [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfDetailedInformationAboutTradeAndOthersPayableAbstract_0" xml:lang="en-US">Disclosure Of Detailed Information About Trade And Others Payable [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfGeographicalAreasNoncurrentAssetsExplanatory_0" xml:lang="en-US">Disclosure of geographical areas, non-current assets.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfGeographicalAreasNoncurrentAssetsExplanatory_1" xml:lang="en-US">Disclosure Of Geographical Areas Non-current Assets Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DisclosureOfGeographicalAreasNoncurrentAssetsExplanatory_2" xml:lang="en-US">Disclosure of detailed information about non-current assets [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfIncomeTaxExpenseReconciliationExplanatory_0" xml:lang="en-US">Disclosure of income tax expense reconciliation explanatory.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfIncomeTaxExpenseReconciliationExplanatory_1" xml:lang="en-US">Disclosure Of Income Tax Expense Reconciliation Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfIncomeTaxExpenseReconciliationExplanatory_2" xml:lang="en-US">Disclosure of detailed information about income tax expense [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfLoansPayableLineItems_0" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfLoansPayableLineItems_1" xml:lang="en-US">Disclosure of Loans Payable [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfLoansPayableTable_0" xml:lang="en-US">Disclosure Of Loans Payable [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfNatureOfOperationsExplanatory_0" xml:lang="en-US">The disclosure of nature of operations.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfNatureOfOperationsExplanatory_1" xml:lang="en-US">Disclosure Of Nature Of Operations Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfNatureOfOperationsExplanatory_2" xml:lang="en-US">NATURE OF OPERATIONS [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatory_0" xml:lang="en-US">The disclosure of range of exercise prices of outstanding warrants explanatory.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatory_1" xml:lang="en-US">Disclosure Of Range Of Exercise Prices Of Outstanding Warrants Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatory_2" xml:lang="en-US">Schedule of range of exercise prices of outstanding warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatory_0" xml:lang="en-US">Disclosure of royalty interests and deferred acquisition costs explanatory.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatory_1" xml:lang="en-US">Disclosure Of Royalty Interests And Deferred Acquisition Costs Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatory_2" xml:lang="en-US">ROYALTY, STREAM, AND OTHER INTERESTS [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems_0" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems_1" xml:lang="en-US">Disclosure of Royalty Interests and Deferred Acquisition Costs [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable_0" xml:lang="en-US">Schedule disclosing information related to royalty interests and deferred acquisition costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable_1" xml:lang="en-US">Disclosure Of Royalty Interests And Deferred Acquisition Costs [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfSignificantAccountingPoliciesAbstract_0" xml:lang="en-US">Disclosure Of Significant Accounting Policies [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DisclosureOfWarrantsActivityExplanatory_0" xml:lang="en-US">The disclosure of warrants activity.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DisclosureOfWarrantsActivityExplanatory_1" xml:lang="en-US">Disclosure Of Warrants Activity Explanatory</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DisclosureOfWarrantsActivityExplanatory_2" xml:lang="en-US">Disclosure of detailed information about warrants activity [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DiscountRateOfAcquisitionDate_0" xml:lang="en-US">It represents discount rate of acquisition date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DiscountRateOfAcquisitionDate_1" xml:lang="en-US">Discount Rate Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DiscountRateOfAcquisitionDate_2" xml:lang="en-US">Discount rate of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DocumentAndEntityInformationAbstract_0" xml:lang="en-US">Document And Entity Information [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DrawDownOnRevolvingCreditFacility_0" xml:lang="en-US">Represents amount of draw down on revolving credit facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DrawDownOnRevolvingCreditFacility_1" xml:lang="en-US">Draw Down On Revolving Credit Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DrawDownOnRevolvingCreditFacility_2" xml:lang="en-US">Draw down on revolving credit facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DrewDownPortionOfRevolvingCreditFacility_0" xml:lang="en-US">Represents amount of drew down portion of revolving credit facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_DrewDownPortionOfRevolvingCreditFacility_1" xml:lang="en-US">Drew Down Portion Of Revolving Credit Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_DrewDownPortionOfRevolvingCreditFacility_2" xml:lang="en-US">Drew down of revolving credit facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_DufferinEastAcquisitionMember_0" xml:lang="en-US">Dufferin East acquisition.</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_DufferinEastAcquisitionMember_2" xml:lang="en-US">Dufferin East Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EffectiveInterestRateOnLiability_0" xml:lang="en-US">Represents the effective interest rate on liability.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EffectiveInterestRateOnLiability_1" xml:lang="en-US">Effective Interest Rate On Liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EffectiveInterestRateOnLiability_2" xml:lang="en-US">Effective interest rate on liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EitherHoylePondMineOrWestTimminsMineMember_0" xml:lang="en-US">Represents either Hoyle Pond mine or West Timmins mine.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EitherHoylePondMineOrWestTimminsMineMember_1" xml:lang="en-US">Either Hoyle Pond Mine Or West Timmins Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EitherHoylePondMineOrWestTimminsMineMember_2" xml:lang="en-US">Either Hoyle Pond mine or West Timmins mine</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EliminationOfHistoricForeignCurrencyAdjustments_0" xml:lang="en-US">Represents the elimination of historic foreign currency adjustments.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EliminationOfHistoricForeignCurrencyAdjustments_1" xml:lang="en-US">Elimination Of Historic Foreign Currency Adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_EliminationOfHistoricForeignCurrencyAdjustments_2" xml:lang="en-US">Elimination of historic foreign currency adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ElRealitoMember_0" xml:lang="en-US">Represent the member of El Realito</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ElRealitoMember_1" xml:lang="en-US">El Realito [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ElRealitoMember_2" xml:lang="en-US">El Realito reclassification [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ElRealitoNsrMember_0" xml:lang="en-US">El Realito NSR.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ElRealitoNsrMember_1" xml:lang="en-US">El Realito Nsr [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ElRealitoNsrMember_2" xml:lang="en-US">El Realito</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ElRealitoNsrMember_3" xml:lang="en-US">El Realito NSR</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EncumberedGoldenDomeClaimsMember_0" xml:lang="en-US">Encumbered Golden Dome claims</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EncumberedGoldenDomeClaimsMember_1" xml:lang="en-US">Encumbered Golden Dome Claims [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EndeavorMember_0" xml:lang="en-US">Endeavor [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EndeavorSilverStreamMember_0" xml:lang="en-US">This member stands for Endeavor Silver Stream.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EndeavorSilverStreamMember_1" xml:lang="en-US">Endeavor Silver Stream [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EndeavorSilverStreamMember_2" xml:lang="en-US">Endeavor Silver Stream reclassification [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EndeavorStreamInterestAsOfAcquisitionDate_0" xml:lang="en-US">Endeavor stream interest as of acquisition date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EndeavorStreamInterestAsOfAcquisitionDate_1" xml:lang="en-US">Endeavor Stream Interest As Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EndeavorStreamInterestAsOfAcquisitionDate_2" xml:lang="en-US">Endeavor stream interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EsperanzaProjectMember_0" xml:lang="en-US">This member stands for Esperanza project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EsperanzaProjectMember_1" xml:lang="en-US">Esperanza Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EstimatedDeliveryOfPayableSilver_0" xml:lang="en-US">Estimated delivery of payable silver.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EstimatedDeliveryOfPayableSilver_1" xml:lang="en-US">Estimated Delivery Of Payable Silver</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EstimatedDeliveryOfPayableSilver_2" xml:lang="en-US">Estimated delivery of payable silver</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EstimatedFairValueOfAmendedLoanFacility_0" xml:lang="en-US">Estimated fair value of Amended Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EstimatedFairValueOfAmendedLoanFacility_1" xml:lang="en-US">Estimated fair value of Amended Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EstimatedFairValueOfCastleMountainLoan_0" xml:lang="en-US">Estimated fair value of Castle Mountain Loan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EstimatedFairValueOfCastleMountainLoan_1" xml:lang="en-US">Estimated fair value of Castle Mountain Loan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EstimatedGoldPricePerOunce_0" xml:lang="en-US">Represents the estimated gold price per ounce.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EstimatedGoldPricePerOunce_1" xml:lang="en-US">Estimated gold price per ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EstimatedUsDollarToAustralianDollarExchangeRate_0" xml:lang="en-US">Estimated U.S. Dollar to Australian Dollar exchange rate.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EstimatedUsDollarToAustralianDollarExchangeRate_1" xml:lang="en-US">Estimated Us Dollar To Australian Dollar Exchange Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_EstimatedUsDollarToAustralianDollarExchangeRate_2" xml:lang="en-US">Estimated U.S. dollar to Australian dollar exchange rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EstimationOfMineralReserveOfRoyalty_0" xml:lang="en-US">It represents estimation of mineral reserve of royalty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EstimationOfMineralReserveOfRoyalty_1" xml:lang="en-US">Estimation Of Mineral Reserve Of Royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EstimationOfMineralReserveOfRoyalty_2" xml:lang="en-US">Estimation of mineral reserve of royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_EventsAfterReportingPeriodMember_0" xml:lang="en-US">This member stand for events after reporting period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_EventsAfterReportingPeriodMember_1" xml:lang="en-US">Events After Reporting Period [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_EventsAfterReportingPeriodMember_2" xml:lang="en-US">Events after the reporting date [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExceedingSilverPricePerOunce_0" xml:lang="en-US">Exceeding silver price per ounce.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExceedingSilverPricePerOunce_1" xml:lang="en-US">Exceeding Silver Price Per Ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExceedingSilverPricePerOunce_2" xml:lang="en-US">Exceeding silver price per ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExchangePricePerShare_0" xml:lang="en-US">It represents exchange price per share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExchangePricePerShare_1" xml:lang="en-US">Exchange Price Per Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExchangePricePerShare_2" xml:lang="en-US">C$/US$ exchange rate on November 30, 2023</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExchangePricePerShare_3" xml:lang="en-US">Exchange price per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExemptionOnGoldProduced_0" xml:lang="en-US">Exemption on gold produced.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExemptionOnGoldProduced_1" xml:lang="en-US">Exemption On Gold Produced</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExemptionOnGoldProduced_2" xml:lang="en-US">Exemption on gold produced</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExercisePriceOfWarrantsIssued_0" xml:lang="en-US">Represents exercise price of warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExercisePriceOfWarrantsIssued_1" xml:lang="en-US">Exercise Price Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExercisePriceOfWarrantsIssued_2" xml:lang="en-US">Exercise price of warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExercisePriceOfWarrantsIssuedWithinUnits_0" xml:lang="en-US">Represents the exercise price of warrants which are issued as part of a unit.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExercisePriceOfWarrantsIssuedWithinUnits_1" xml:lang="en-US">Exercise Price Of Warrants Issued Within Units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExercisePriceOfWarrantsIssuedWithinUnits_2" xml:lang="en-US">Exercise price of warrants issued within units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpectedDividendAsPercentageWarrantsGranted_0" xml:lang="en-US">The percentage of an expected dividend used to calculate the fair value of warrants granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedDividendAsPercentageWarrantsGranted_1" xml:lang="en-US">Expected Dividend As Percentage Warrants Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpectedDividendAsPercentageWarrantsGranted_2" xml:lang="en-US">Expected dividend yield</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_mta_ExpectedDividendYield_0" xml:lang="en-US">Expected dividend yield</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedDividendYield_1" xml:lang="en-US">Expected Dividend Yield</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpectedDividendYield_2" xml:lang="en-US">Dividend yield</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpectedLifeInYears_0" xml:lang="en-US">Expected life in years</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedLifeInYears_1" xml:lang="en-US">Expected Life In Years</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpectedLifeInYears_2" xml:lang="en-US">Expected life in years</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpectedLifeOfLiability_0" xml:lang="en-US">Represent the expected life of liability.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedLifeOfLiability_1" xml:lang="en-US">Expected Life Of Liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpectedLifeOfLiability_2" xml:lang="en-US">Expected life of liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpectedLifeOfWarrantsGranted_0" xml:lang="en-US">Expected life of warrants granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedLifeOfWarrantsGranted_1" xml:lang="en-US">Expected Life Of Warrants Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpectedLifeOfWarrantsGranted_2" xml:lang="en-US">Expected life in years</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpectedStockPriceVolatility_0" xml:lang="en-US">The percentage of expected stock price volatility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedStockPriceVolatility_1" xml:lang="en-US">Expected Stock Price Volatility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpectedStockPriceVolatility_2" xml:lang="en-US">Expected volatility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpectedVolatilityWarrantsGranted_0" xml:lang="en-US">Represents expected volatility of warrants granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpectedVolatilityWarrantsGranted_1" xml:lang="en-US">Expected Volatility Warrants Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpectedVolatilityWarrantsGranted_2" xml:lang="en-US">Expected stock price volatility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_Expiry2026To2043Member_0" xml:lang="en-US">This member stands for Expiry 2026 to 2043.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_Expiry2026To2043Member_1" xml:lang="en-US">Expiry 2026 To 2043 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryAugust162027Member_0" xml:lang="en-US">It indicates expiry date as August 16, 2027.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryAugust162027Member_1" xml:lang="en-US">Expiry August 16 2027 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryAugust162027Member_2" xml:lang="en-US">August 16, 2027 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateApril272026Member_0" xml:lang="en-US">It indicates expiry date as April 27, 2026.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateApril272026Member_1" xml:lang="en-US">Expiry Date April 27, 2026 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateApril272026Member_2" xml:lang="en-US">April 27, 2026 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateAug272026Member_0" xml:lang="en-US">It indicated expire date as August 27, 2026.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateAug272026Member_1" xml:lang="en-US">Expiry Date Aug 27 2026 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateAug272026Member_2" xml:lang="en-US">August 27, 2026 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateAugust112021Member_0" xml:lang="en-US">It indicates expiry date as Aug 11, 2021.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateAugust112021Member_1" xml:lang="en-US">Expiry Date August 11, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateAugust112021Member_2" xml:lang="en-US">Aug 11, 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateAugust112021Member_3" xml:lang="en-US">Aug 11, 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateAugust302021Member_0" xml:lang="en-US">It indicates expiry date as Aug 30, 2021.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateAugust302021Member_1" xml:lang="en-US">Expiry Date August 30, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateAugust302021Member_2" xml:lang="en-US">Aug 30, 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateAugust302021Member_3" xml:lang="en-US">Aug 30, 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateAxis_0" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateAxis_1" xml:lang="en-US">Expiry Date [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateDecember052020Member_0" xml:lang="en-US">It indicates expiry date as Dec 05, 2020.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateDecember052020Member_1" xml:lang="en-US">Expiry Date December 05 2020 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateDecember052020Member_2" xml:lang="en-US">Dec 05, 2020</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateDecember212020Member_0" xml:lang="en-US">It indicates expiry date as Dec 21, 2020.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateDecember212020Member_1" xml:lang="en-US">Expiry Date December 21 2020 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateDecember212020Member_2" xml:lang="en-US">Dec 21, 2020</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateDecember282028Member_0" xml:lang="en-US">This member stands for Expiry date December 28, 2028.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateDecember282028Member_1" xml:lang="en-US">Expiry Date December 28, 2028 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateDecember282028Member_2" xml:lang="en-US">December 28, 2028 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateDomain_0" xml:lang="en-US">Definition :
It represents expiry date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateDomain_1" xml:lang="en-US">Expiry Date [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateFeb222028Member_0" xml:lang="en-US">It indicated expire date as February 22, 2028.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateFeb222028Member_1" xml:lang="en-US">Expiry Date Feb 22 2028 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateFeb222028Member_2" xml:lang="en-US">February 22, 2028 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateFebruary202030Member_0" xml:lang="en-US">It indicates expiry date as February 20, 2030.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateFebruary202030Member_1" xml:lang="en-US">Expiry Date February 20, 2030 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateFebruary202030Member_2" xml:lang="en-US">February 20, 2030 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateJan042024Member_0" xml:lang="en-US">It indicates expiry date as Jan 04, 2024	.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateJan042024Member_1" xml:lang="en-US">Expiry Date Jan 04 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateJan042024Member_2" xml:lang="en-US">January 4, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateJanuary042021Member_0" xml:lang="en-US">It indicates expiry date as Jan 04, 2021	.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateJanuary042021Member_1" xml:lang="en-US">Expiry Date January 04 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateJanuary042021Member_2" xml:lang="en-US">Jan 04, 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateJul152021Member_0" xml:lang="en-US">It indicates expiry date as Jul 15, 2021.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateJul152021Member_1" xml:lang="en-US">Expiry Date Jul 15, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateJul152021Member_2" xml:lang="en-US">July 15, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateJul202027Member_0" xml:lang="en-US">It indicated expire date as July 20, 2027.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateJul202027Member_1" xml:lang="en-US">Expiry Date Jul 20 2027 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateJul202027Member_2" xml:lang="en-US">July 20, 2027 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateJul232029Member_0" xml:lang="en-US">It indicated expire date as July 23, 2029.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateJul232029Member_1" xml:lang="en-US">Expiry Date Jul 23 2029 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateJul232029Member_2" xml:lang="en-US">July 23, 2029 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateJul312022Member_0" xml:lang="en-US">It indicates expiry date as Jul 31, 2022.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateJul312022Member_1" xml:lang="en-US">Expiry Date Jul 31, 2022 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateJul312022Member_2" xml:lang="en-US">July 31, 2022 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateMar012023Member_0" xml:lang="en-US">It indicates expiry date as Mar 01, 2023.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateMar012023Member_1" xml:lang="en-US">Expiry Date Mar 01, 2023 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateMar012023Member_2" xml:lang="en-US">March 1, 2023 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateMar062022Member_0" xml:lang="en-US">It indicates expiry date as Mar 06, 2022.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateMar062022Member_1" xml:lang="en-US">Expiry Date Mar 06, 2022 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateMar062022Member_2" xml:lang="en-US">March 6, 2022 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateMarch12024Member_0" xml:lang="en-US">This member stands for expiry date March 1, 2024.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateMarch12024Member_1" xml:lang="en-US">Expiry Date March 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateMarch12024Member_2" xml:lang="en-US">March 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateNov062025Member_0" xml:lang="en-US">It indicates expiry date as Nov 06 2025.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateNov062025Member_1" xml:lang="en-US">Expiry Date Nov 06 2025 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateNov062025Member_2" xml:lang="en-US">November 6, 2025 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateNov152021Member_0" xml:lang="en-US">It indicates expiry date as Nov 15, 2021.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateNov152021Member_1" xml:lang="en-US">Expiry Date Nov 15, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateNov152021Member_2" xml:lang="en-US">November 30, 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateNov302021Member_0" xml:lang="en-US">It indicates expiry date as Nov 30, 2021.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateNov302021Member_1" xml:lang="en-US">Expiry Date Nov 30, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateNov302021Member_2" xml:lang="en-US">November 30, 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateNovember082020Member_0" xml:lang="en-US">It indicates expiry date as Nov 08, 2020.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateNovember082020Member_1" xml:lang="en-US">Expiry Date November 08 2020 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateNovember082020Member_2" xml:lang="en-US">Nov 08, 2020</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateOctober062019Member_0" xml:lang="en-US">It indicates expiry date as Oct 06, 2019	.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateOctober062019Member_1" xml:lang="en-US">Expiry Date October 06 2019 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExpiryDateOctober062019Member_2" xml:lang="en-US">Oct 06, 2019</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExpiryDateSep172023Member_0" xml:lang="en-US">It indicates expiry date as Sep 17, 2023.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExpiryDateSep172023Member_1" xml:lang="en-US">Expiry Date Sep 17 2023 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExpiryDateSep172023Member_2" xml:lang="en-US">September 17, 2023 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExplorationAssetsMember_0" xml:lang="en-US">Exploration Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExplorationAssetsMember_1" xml:lang="en-US">Exploration Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ExplorationAssetsMember_2" xml:lang="en-US">Exploration Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ExtinguishmentOfLoanFacility_0" xml:lang="en-US">Amount of Extinguishment of loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ExtinguishmentOfLoanFacility_1" xml:lang="en-US">Extinguishment Of Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ExtinguishmentOfLoanFacility_2" xml:lang="en-US">Extinguishment of loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FaceValueOfDebt_0" xml:lang="en-US">Amount of face value of the debt.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FaceValueOfDebt_1" xml:lang="en-US">Face Value Of Debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FaceValueOfDebt_2" xml:lang="en-US">Face value of debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FairValueAdjustmentOfDerivativePortion_0" xml:lang="en-US">Amount of Fair value adjustment of derivative portion.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueAdjustmentOfDerivativePortion_1" xml:lang="en-US">Fair Value Adjustment Of Derivative Portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FairValueAdjustmentOfDerivativePortion_2" xml:lang="en-US">Fair value adjustment of derivative portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FairValueAdjustmentOfInvestmentInAssociate_0" xml:lang="en-US">Fair value adjustment of investment in associate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueAdjustmentOfInvestmentInAssociate_1" xml:lang="en-US">Fair Value Adjustment Of Investment In Associate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FairValueAdjustmentOfInvestmentInAssociate_2" xml:lang="en-US">Fair value adjustment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FairValueAtMeasurementDateShareOptionsGranted_0" xml:lang="en-US">Fair value at measurement date, share options granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueAtMeasurementDateShareOptionsGranted_1" xml:lang="en-US">Fair Value At Measurement Date Share Options Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FairValueAtMeasurementDateShareOptionsGranted_2" xml:lang="en-US">Fair value at measurement date, share options granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FairValueOfDerivativeLoanLiabilities_0" xml:lang="en-US">Represent the fair value of derivative loan liabilities.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueOfDerivativeLoanLiabilities_1" xml:lang="en-US">Fair Value Of Derivative Loan Liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FairValueOfDerivativeLoanLiabilities_2" xml:lang="en-US">Fair value of derivative loan liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueOfNetSmelterReturnRoyalty_0" xml:lang="en-US">Fair Value Of Net Smelter Return Royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FairValueOfNetSmelterReturnRoyalty_1" xml:lang="en-US">Fair value of NSR royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FairValueOfRestrictedShareUnitsGranted_0" xml:lang="en-US">Fair value of restricted share units granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueOfRestrictedShareUnitsGranted_1" xml:lang="en-US">Fair Value Of Restricted Share Units Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FairValueOfRestrictedShareUnitsGranted_2" xml:lang="en-US">Restricted share units vested</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FairValueOfRestrictedShareUnitsGranted_3" xml:lang="en-US">Fair value of restricted stock units granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FairValueOfWarrantsIssued_0" xml:lang="en-US">Represents fair value of warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FairValueOfWarrantsIssued_1" xml:lang="en-US">Fair Value Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FairValueOfWarrantsIssued_2" xml:lang="en-US">Fair value of warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_February2021Member_0" xml:lang="en-US">February 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_February2021Member_1" xml:lang="en-US">February 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FennGibbSouthProjectMember_0" xml:lang="en-US">This member stands for Fenn Gibb South project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FennGibbSouthProjectMember_1" xml:lang="en-US">Fenn Gibb South Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FifteenMileStreamAcquisitionsMember_0" xml:lang="en-US">15 Mile Stream acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FifteenMileStreamAcquisitionsMember_1" xml:lang="en-US">Fifteen Mile Stream Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FifteenMileStreamAcquisitionsMember_2" xml:lang="en-US">Fifteen Mile Stream (FMS) acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FifthDrawdownMember_0" xml:lang="en-US">Fifth Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FifthDrawdownMember_1" xml:lang="en-US">Fifth Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FiloAcquisitionsMember_0" xml:lang="en-US">Filo acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FiloAcquisitionsMember_1" xml:lang="en-US">Filo Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FiloAcquisitionsMember_2" xml:lang="en-US">Filo acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FinanceChargeIncludingStandbyFeesOnUndrawnPortion_0" xml:lang="en-US">Finance Charge including standby fees on undrawn portion.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FinanceChargeIncludingStandbyFeesOnUndrawnPortion_1" xml:lang="en-US">Finance Charge Including Standby Fees On Undrawn Portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FinanceChargeIncludingStandbyFeesOnUndrawnPortion_2" xml:lang="en-US">Finance Charge including standby fees on undrawn portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FinancialAssetsAtAmortizedCostAbstract_0" xml:lang="en-US">Financial Assets At Amortized Cost [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FinancialAssetsAtAmortizedCostAbstract_1" xml:lang="en-US">Financial Assets At Amortized Cost [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FinancialAssetsAtAmortizedCostAbstract_2" xml:lang="en-US">Amortized cost:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FinancialLiabilitiesAmortizedCostAbstract_0" xml:lang="en-US">Financial Liabilities Amortized Cost [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FinancialLiabilitiesAmortizedCostAbstract_1" xml:lang="en-US">Financial Liabilities Amortized Cost [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FinancialLiabilitiesAmortizedCostAbstract_2" xml:lang="en-US">Amortized cost:</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FinancingBonusReceived_0" xml:lang="en-US">The amount of financing bonus received.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FinancingBonusReceived_1" xml:lang="en-US">Financing Bonus Received</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FinancingBonusReceived_2" xml:lang="en-US">Financing bonus received</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FinderFeesPaid_0" xml:lang="en-US">The amount of finder fees paid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FinderFeesPaid_1" xml:lang="en-US">Finder Fees Paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FinderFeesPaid_2" xml:lang="en-US">Finder fees paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FindersShareIssueRelatedCosts_0" xml:lang="en-US">Amount related to finders shares issue related costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FindersShareIssueRelatedCosts_1" xml:lang="en-US">Finders Share Issue Related Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FindersShareIssueRelatedCosts_2" xml:lang="en-US">Share issue costs, finder's shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FindersWarrantsShareIssueRelatedCosts_0" xml:lang="en-US">Represents amount related to finders warrants shares issue related cost.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FindersWarrantsShareIssueRelatedCosts_1" xml:lang="en-US">Finders Warrants Share Issue Related Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FindersWarrantsShareIssueRelatedCosts_2" xml:lang="en-US">Share issue costs, finder's warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FirstAmendmentMember_0" xml:lang="en-US">First Amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FirstAmendmentMember_1" xml:lang="en-US">First Amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FirstAmendmentMember_2" xml:lang="en-US">First Amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FirstDrawdownMember_0" xml:lang="en-US">First Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FirstDrawdownMember_1" xml:lang="en-US">First Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FirstExpiryDateDecember12024Member_0" xml:lang="en-US">This member stands for Expiry date December 1, 2024.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FirstExpiryDateDecember12024Member_1" xml:lang="en-US">First Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FirstExpiryDateDecember12024Member_2" xml:lang="en-US">December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FirstMajesticPortfolioAcquisitionMember_0" xml:lang="en-US">This member stands for first majestic portfolio acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FirstMajesticPortfolioAcquisitionMember_1" xml:lang="en-US">First Majestic Portfolio Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FirstMajesticPortfolioAcquisitionMember_2" xml:lang="en-US">First Majestic Silver Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FiveDaysVolumeWeightedAveragePriceMember_0" xml:lang="en-US">Five Days Volume Weighted Average Price [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FiveDaysVolumeWeightedAveragePriceMember_1" xml:lang="en-US">Five Days Volume Weighted Average Price [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FiveDaysVolumeWeightedAveragePriceMember_2" xml:lang="en-US">5-day VWAP [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ForfeitureRate_0" xml:lang="en-US">The percentage of forfeiture rate.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ForfeitureRate_1" xml:lang="en-US">Forfeiture Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ForfeitureRate_2" xml:lang="en-US">Forfeiture rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FostervilleAcquisitionMember_0" xml:lang="en-US">Fosterville acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FostervilleAcquisitionMember_1" xml:lang="en-US">Fosterville Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FostervilleAcquisitionMember_2" xml:lang="en-US">Fosterville acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FourthDrawdownMember_0" xml:lang="en-US">Represents the drawdown details of the convertible loan facility drew down in October 2021.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FourthDrawdownMember_1" xml:lang="en-US">Fourth Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_FourthDrawdownMember_2" xml:lang="en-US">Fourth Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_FourthExpiryDateDecember12024Member_0" xml:lang="en-US">Fourth Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_FourthExpiryDateDecember12024Member_1" xml:lang="en-US">Fourth Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_FourthExpiryDateDecember12024Member_2" xml:lang="en-US">December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GainLossesOnChangesInFairValueOfDerivativeLoanLiability_0" xml:lang="en-US">The amount represents for gain losses on changes in fair value of derivative loan liability.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_GainLossesOnChangesInFairValueOfDerivativeLoanLiability_1" xml:lang="en-US">Mark-to-market gain on derivative loan liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GainLossesOnChangesInFairValueOfDerivativeLoanLiability_2" xml:lang="en-US">Gain Losses On Changes In Fair Value Of Derivative Loan Liability</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GainLossesOnChangesInFairValueOfDerivativeLoanLiability_3" xml:lang="en-US">Mark-to-market gain on derivative loan liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GainLossOnExtensionOfLoanPayable_0" xml:lang="en-US">Represents amount of gain loss on extension of loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_GainLossOnExtensionOfLoanPayable_1" xml:lang="en-US">Gain on extension of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GainLossOnExtensionOfLoanPayable_2" xml:lang="en-US">Gain Loss On Extension Of Loan Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GainLossOnExtensionOfLoanPayable_3" xml:lang="en-US">Gain on extension of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GainLossOnModificationOfLoanPayable_0" xml:lang="en-US">Gain (loss) on modification of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_GainLossOnModificationOfLoanPayable_1" xml:lang="en-US">Loss on modification of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GainLossOnModificationOfLoanPayable_2" xml:lang="en-US">Gain (Loss) On Modification Of Loan Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_GainLossOnModificationOfLoanPayable_3" xml:lang="en-US">Loss on modification of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GainOnSaleOfAcquisitionDate_0" xml:lang="en-US">It represents gain on sale of acquisition date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GainOnSaleOfAcquisitionDate_1" xml:lang="en-US">Gain On Sale Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GainOnSaleOfAcquisitionDate_2" xml:lang="en-US">Gain on sale of acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GainOnSalesOfMineralClaims_0" xml:lang="en-US">The amount represents for gain on sales of mineral claims.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_GainOnSalesOfMineralClaims_1" xml:lang="en-US">Gain on sales of mineral claims</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GainOnSalesOfMineralClaims_2" xml:lang="en-US">Gain On Sales Of Mineral Claims</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GainOnSalesOfMineralClaims_3" xml:lang="en-US">Gain on sales of mineral claims</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GarrisonProjectNsrMember_0" xml:lang="en-US">Garrison project NSR.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GarrisonProjectNsrMember_1" xml:lang="en-US">Garrison Project Nsr [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_GarrisonProjectNsrMember_2" xml:lang="en-US">Garrison</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GarrisonProjectNsrMember_3" xml:lang="en-US">Garrison project NSR</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GenesisAndGsiAcquisitionsMember_0" xml:lang="en-US">Genesis and GSI acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GenesisAndGsiAcquisitionsMember_1" xml:lang="en-US">Genesis And Gsi Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GenesisAndGsiAcquisitionsMember_2" xml:lang="en-US">Genesis and GSI acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GoldenDomeMember_0" xml:lang="en-US">Golden Dome [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GoldenDomeMember_1" xml:lang="en-US">Golden Dome [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GoldenTagResourcesLtdMember_0" xml:lang="en-US">This member stands for Golden Tag Resources Ltd.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GoldenTagResourcesLtdMember_1" xml:lang="en-US">Golden Tag Resources Ltd [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GoldMineralReserveEstimate_0" xml:lang="en-US">Gold mineral reserve estimate.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GoldMineralReserveEstimate_1" xml:lang="en-US">Gold Mineral Reserve Estimate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GoldMineralReserveEstimate_2" xml:lang="en-US">Gold mineral reserve estimate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GoldPricePerOunce_0" xml:lang="en-US">Gold price per ounce.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GoldPricePerOunce_1" xml:lang="en-US">Gold Price Per Ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_GoldPricePerOunce_2" xml:lang="en-US">Gold price per ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GreenSpringsMember_0" xml:lang="en-US">Green Springs [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GreenSpringsMember_1" xml:lang="en-US">Green Springs [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GrossProceedsFromIssuanceOfCommonSharesThroughAtmProgram_0" xml:lang="en-US">Represents the amount related to gross proceeds from issuance of common shares through ATM program.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GrossProceedsFromIssuanceOfCommonSharesThroughAtmProgram_1" xml:lang="en-US">Gross Proceeds From Issuance Of Common Shares Through Atm Program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GrossProceedsFromIssuanceOfCommonSharesThroughAtmProgram_2" xml:lang="en-US">Gross proceeds from issuance of common shares in ATM program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GrossProceedsFromIssuenceOfShares_0" xml:lang="en-US">Proceeds from issuing shares.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GrossProceedsFromIssuenceOfShares_1" xml:lang="en-US">Gross Proceeds From Issuence Of Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_GrossProceedsFromIssuenceOfShares_2" xml:lang="en-US">Gross proceeds from issuance of shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GrossValueReturnAcquiredPercentage_0" xml:lang="en-US">Represents the gross value return acquired percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GrossValueReturnAcquiredPercentage_1" xml:lang="en-US">Gross Value Return Acquired Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GrossValueReturnAcquiredPercentage_2" xml:lang="en-US">Percentage of GVR royalty interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GrossValueReturnRoyaltyInterestPercentage_0" xml:lang="en-US">Represents acquisition percentage on Gross Value Return ("GVR") royalty interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GrossValueReturnRoyaltyInterestPercentage_1" xml:lang="en-US">Gross Value Return Royalty Interest Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_GrossValueReturnRoyaltyInterestPercentage_2" xml:lang="en-US">Percentage of GVR royalty interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_GrSilverMiningLtdMember_0" xml:lang="en-US">This member stands for GR Silver Mining Ltd.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_GrSilverMiningLtdMember_1" xml:lang="en-US">Gr Silver Mining Ltd [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_GrSilverMiningLtdMember_2" xml:lang="en-US">GR Silver Mining Ltd [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_HalfOfNetSmelterReturnAcquiredPercentage_0" xml:lang="en-US">Represents the percentage of half of net smelter return acquired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_HalfOfNetSmelterReturnAcquiredPercentage_1" xml:lang="en-US">Half Of Net Smelter Return Acquired Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_HalfOfNetSmelterReturnAcquiredPercentage_2" xml:lang="en-US">Half of the NSR royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_HigginsvilleGoldOperationsMember_0" xml:lang="en-US">Higginsville Gold Operations.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_HigginsvilleGoldOperationsMember_1" xml:lang="en-US">Higginsville Gold Operations [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_HigginsvillePprMember_0" xml:lang="en-US">Representa the member information related to Higginsville PPR.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_HigginsvillePprMember_1" xml:lang="en-US">Higginsville Ppr [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_HigginsvillePprMember_2" xml:lang="en-US">Higginsville PPR [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_HighStreamCorpMember_0" xml:lang="en-US">High Stream Corp</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_HighStreamCorpMember_1" xml:lang="en-US">High Stream Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_HighStreamCorpMember_2" xml:lang="en-US">High Stream Corp. ("High Stream")</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_HistoricalCostsRoyaltyAndStreamInterests_0" xml:lang="en-US">Historical costs Royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_HistoricalCostsRoyaltyAndStreamInterests_1" xml:lang="en-US">Historical Costs Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_HistoricalCostsRoyaltyAndStreamInterests_2" xml:lang="en-US">Historical cost</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_HolyePondExtensionPropertyMember_0" xml:lang="en-US">Holye Pond extension property.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_HolyePondExtensionPropertyMember_1" xml:lang="en-US">Holye Pond Extension Property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_HolyePondExtensionPropertyMember_2" xml:lang="en-US">Holye Pond extension property</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IdahoResourcesCorpAcquisitionMember_0" xml:lang="en-US">Idaho Resources Corp. acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IdahoResourcesCorpAcquisitionMember_1" xml:lang="en-US">Idaho Resources Corp. Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IdahoResourcesCorpAcquisitionMember_2" xml:lang="en-US">Idaho Resources Corp. acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IepiAcquisitionsMember_0" xml:lang="en-US">IEPI acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IepiAcquisitionsMember_1" xml:lang="en-US">Iepi Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IepiAcquisitionsMember_2" xml:lang="en-US">IEPI acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncomeTaxesAbstract_0" xml:lang="en-US">Income Taxes [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncomeTaxesAbstract_1" xml:lang="en-US">Difference between Canadian and foreign tax rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncomeTaxExpirationPeriodRangeAxis_0" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncomeTaxExpirationPeriodRangeAxis_1" xml:lang="en-US">Income Tax Expiration Period Range [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncomeTaxExpirationPeriodRangeDomain_0" xml:lang="en-US">It's represents the income tax expiration period range.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncomeTaxExpirationPeriodRangeDomain_1" xml:lang="en-US">Income Tax Expiration Period Range [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseInDeferredAcquisitionCosts_0" xml:lang="en-US">Amount related to deferred acquisition costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseInDeferredAcquisitionCosts_1" xml:lang="en-US">Increase Decrease In Deferred Acquisition Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseInDeferredAcquisitionCosts_2" xml:lang="en-US">Deferred acquisition costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants_0" xml:lang="en-US">Amount represents information related to loans payable value increase decrease through issued of warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants_1" xml:lang="en-US">Increase Decrease Loans Payable Through Issued Of Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants_2" xml:lang="en-US">Warrants issued for loans payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreasePrepaidExpensesAndOther_0" xml:lang="en-US">Represents amount related to prepaid expenses and other.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreasePrepaidExpensesAndOther_1" xml:lang="en-US">Increase Decrease Prepaid Expenses And Other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreasePrepaidExpensesAndOther_2" xml:lang="en-US">Prepaid expenses and other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfNovaRoyaltyCorp_0" xml:lang="en-US">Represents the amount of increase through through acquisition of nova royalty corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfNovaRoyaltyCorp_1" xml:lang="en-US">Increase Decrease Through Acquisition Of Nova Royalty Corp</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfNovaRoyaltyCorp_2" xml:lang="en-US">Acquisition of Nova Royalty Corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfNovaRoyaltyCorpInShares_0" xml:lang="en-US">The amount represents the number of shares related to acquisition of nova royalty corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfNovaRoyaltyCorpInShares_1" xml:lang="en-US">Increase Decrease Through Acquisition Of Nova Royalty Corp In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfNovaRoyaltyCorpInShares_2" xml:lang="en-US">Acquisition of Nova Royalty Corp. (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterest_0" xml:lang="en-US">Represents amount related to increase (decrease) through acquisition of royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterest_1" xml:lang="en-US">Increase Decrease Through Acquisition Of Royalty And Stream Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterest_2" xml:lang="en-US">Acquisition of royalties and other interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests_0" xml:lang="en-US">Increase Decrease Through Acquisition Of Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests_1" xml:lang="en-US">Increase Decrease Through Acquisition Of Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests_2" xml:lang="en-US">Acquisition of royalty and other interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares_0" xml:lang="en-US">Represents number of share related to acquisition of royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares_1" xml:lang="en-US">Increase Decrease Through Acquisition Of Royalty And Stream Interests In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares_2" xml:lang="en-US">Acquisition of royalties and other interests(shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests_0" xml:lang="en-US">Represents amount related to increase (decrease) through acquisition of royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests_1" xml:lang="en-US">Increase Decrease Through Acquisition Of Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests_2" xml:lang="en-US">Acquisition of royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughAllocationOfConversionFeature_0" xml:lang="en-US">Represent the amount of increase decrease through allocation of conversion feature.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughAllocationOfConversionFeature_1" xml:lang="en-US">Increase Decrease Through Allocation Of Conversion Feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughAllocationOfConversionFeature_2" xml:lang="en-US">Allocation of conversion feature net of taxes</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughBeedieSubscription_0" xml:lang="en-US">Represents the amount of increase decrease through beedie subscription.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughBeedieSubscription_1" xml:lang="en-US">Increase Decrease Through Beedie Subscription</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughBeedieSubscription_2" xml:lang="en-US">Beedie subscription</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughBeedieSubscriptionInShares_0" xml:lang="en-US">Represents the amount of shares for increase decrease through beedie subscription.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughBeedieSubscriptionInShares_1" xml:lang="en-US">Increase Decrease Through Beedie Subscription In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughBeedieSubscriptionInShares_2" xml:lang="en-US">Beedie subscription (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughCommittedSharesNotIssued_0" xml:lang="en-US">Increase decrease through committed shares not issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveTerseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughCommittedSharesNotIssued_1" xml:lang="en-US">Common shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughCommittedSharesNotIssued_2" xml:lang="en-US">Increase Decrease Through Committed Shares Not Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughCommittedSharesNotIssued_3" xml:lang="en-US">Committed shares not issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughCommittedSharesNotIssued_4" xml:lang="en-US">Common shares committed</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughConversionOnLoanPayableShares_0" xml:lang="en-US">Increase (decrease) in number of shares through conversion on loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughConversionOnLoanPayableShares_1" xml:lang="en-US">Increase Decrease Through Conversion On Loan Payable Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughConversionOnLoanPayableShares_2" xml:lang="en-US">Conversion of loan payable (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughConversionOnLoanPayableShares_3" xml:lang="en-US">Common shares issued related to conversion of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfOptionsShares_0" xml:lang="en-US">Proceeds from exercise of options (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfOptionsShares_1" xml:lang="en-US">Increase Decrease Through Exercise Of Options Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfOptionsShares_2" xml:lang="en-US">Exercise of stock options (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfSharePurchaseWarrants_0" xml:lang="en-US">Represents the increase decrease through exercise of share purchase warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfSharePurchaseWarrants_1" xml:lang="en-US">Increase Decrease Through Exercise Of Share Purchase Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfSharePurchaseWarrants_2" xml:lang="en-US">Exercise of share purchase warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfSharePurchaseWarrantsShares_0" xml:lang="en-US">Represents the increase decrease through exercise of share purchase warrants, shares.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfSharePurchaseWarrantsShares_1" xml:lang="en-US">Increase Decrease Through Exercise Of Share Purchase Warrants, Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfSharePurchaseWarrantsShares_2" xml:lang="en-US">Exercise of share purchase warrants (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsEquityShares_0" xml:lang="en-US">Represents number of share related to exercise of share purchase and finder's warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsEquityShares_1" xml:lang="en-US">Increase Decrease Through Exercise Of Warrants Equity Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsEquityShares_2" xml:lang="en-US">Exercise of share purchase warrants (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsIncludingFindersWarrantsEquity_0" xml:lang="en-US">Increase Decrease Through Exercise Of Warrants Including Finders Warrants Equity</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsIncludingFindersWarrantsEquity_1" xml:lang="en-US">Increase Decrease Through Exercise Of Warrants Including Finders Warrants Equity</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsIncludingFindersWarrantsEquity_2" xml:lang="en-US">Exercise of share purchase and finder's warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsIncludingFindersWarrantsEquityShares_0" xml:lang="en-US">Increase Decrease Through Exercise Of Warrants Including Finders Warrants Equity Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsIncludingFindersWarrantsEquityShares_1" xml:lang="en-US">Increase Decrease Through Exercise Of Warrants Including Finders Warrants Equity Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExerciseOfWarrantsIncludingFindersWarrantsEquityShares_2" xml:lang="en-US">Exercise of share purchase and finder's warrants (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughExtinguishmentOfLoanPayable_0" xml:lang="en-US">Represents the amount of increase decrease through extinguishment of loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughExtinguishmentOfLoanPayable_1" xml:lang="en-US">Increase Decrease Through Extinguishment Of Loan Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughExtinguishmentOfLoanPayable_2" xml:lang="en-US">Extinguishment of loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughIssuanceOfCommittedShares_0" xml:lang="en-US">The increase decrease in issuance of committed shares.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughIssuanceOfCommittedShares_1" xml:lang="en-US">Increase Decrease Through Issuance Of Committed Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughIssuanceOfCommittedShares_2" xml:lang="en-US">Issuance of committed shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughIssuanceOfCommittedSharesInShares_0" xml:lang="en-US">The increase decrease in number of issuance of committed shares.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughIssuanceOfCommittedSharesInShares_1" xml:lang="en-US">Increase Decrease Through Issuance Of Committed Shares In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughIssuanceOfCommittedSharesInShares_2" xml:lang="en-US">Issuance of committed shares (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions_0" xml:lang="en-US">Amount related to performance based payment transactions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions_1" xml:lang="en-US">Increase Decrease Through Performance Based Payment Transactions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions_2" xml:lang="en-US">Value of shares issued for performance based share based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions_3" xml:lang="en-US">Performance-based share-based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare_0" xml:lang="en-US">Represents number of share related to performance based payments transactions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare_1" xml:lang="en-US">Increase Decrease Through Performance Based Payment Transactions In Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare_2" xml:lang="en-US">Number of common shares issued for performance based share based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare_3" xml:lang="en-US">Performance-based share-based payments (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacement_0" xml:lang="en-US">Represents the amount of Increase Decrease Through Private Placement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacement_1" xml:lang="en-US">Increase Decrease Through Private Placement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacement_2" xml:lang="en-US">Private placement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances_0" xml:lang="en-US">Amount represents for private placements and share issuances.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances_1" xml:lang="en-US">Increase Decrease Through Private Placements And Share Issuances</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances_2" xml:lang="en-US">Private placements and share issuances</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares_0" xml:lang="en-US">Element represent number of shares related to private placement and shares issuances.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares_1" xml:lang="en-US">Increase Decrease Through Private Placements And Share Issuances Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares_2" xml:lang="en-US">Private placements and share issuances (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementShares_0" xml:lang="en-US">Increase (decrease) in number of shares through private placement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementShares_1" xml:lang="en-US">Increase Decrease Through Private Placement (Shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementShares_2" xml:lang="en-US">Common shares issued related to a private placement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughPrivatePlacementShares_3" xml:lang="en-US">Private placement (Shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsOffSettingCreditOfReserves_0" xml:lang="en-US">The increase (decrease) in equity resulting from share-based payment transactions offsetting credit of reserves.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsOffSettingCreditOfReserves_1" xml:lang="en-US">Increase Decrease Through Share Based Payment Transactions Off Setting Credit Of Reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsOffSettingCreditOfReserves_2" xml:lang="en-US">Share-based payments expense of offsetting credit reserves</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsOffSettingCreditOfShareCapital_0" xml:lang="en-US">The increase (decrease) in equity resulting from share-based payment transactions for offsetting credit of share capital.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsOffSettingCreditOfShareCapital_1" xml:lang="en-US">Increase Decrease Through Share Based Payment Transactions Off Setting Credit Of Share Capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsOffSettingCreditOfShareCapital_2" xml:lang="en-US">Share-based payments expense of offsetting credit share capital</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsVestingTermsOfRsuGranted_0" xml:lang="en-US">The increase (decrease) in equity resulting from share-based payment transactions for vesting terms of the RSUs granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsVestingTermsOfRsuGranted_1" xml:lang="en-US">Increase Decrease Through Share Based Payment Transactions Vesting Terms Of Rsu Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughShareBasedPaymentTransactionsVestingTermsOfRsuGranted_2" xml:lang="en-US">Share-based payments expense vesting terms of RSUs granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCosts_0" xml:lang="en-US">Increase decrease through shares issued in at-the-market, net of issue costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCosts_1" xml:lang="en-US">Increase Decrease Through Shares Issued In At Market Net Of Issue Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCosts_2" xml:lang="en-US">Shares issued in ATM, net of issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCosts_3" xml:lang="en-US">Value of shares issued in ATM</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCostsShares_0" xml:lang="en-US">Number of shares issued through Increase decrease in at-the-market, net of issue costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCostsShares_1" xml:lang="en-US">Increase Decrease Through Shares Issued In At Market Net Of Issue Costs Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCostsShares_2" xml:lang="en-US">Shares issued in ATM, net of issue costs (in shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedInAtMarketNetOfIssueCostsShares_3" xml:lang="en-US">Number of shares issued in ATM</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedOnVestingOfRestrictedShareUnits_0" xml:lang="en-US">The increase decrease in Shares issued on vesting of restricted share units.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedOnVestingOfRestrictedShareUnits_1" xml:lang="en-US">Increase Decrease Through Shares Issued On Vesting Of Restricted Share Units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedOnVestingOfRestrictedShareUnits_2" xml:lang="en-US">Shares issued on vesting of restricted share units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedOnVestingOfRestrictedShareUnitsInShares_0" xml:lang="en-US">The increase decrease in number of Shares issued on vesting of restricted share units.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedOnVestingOfRestrictedShareUnitsInShares_1" xml:lang="en-US">Increase Decrease Through Shares Issued On Vesting Of Restricted Share Units In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughSharesIssuedOnVestingOfRestrictedShareUnitsInShares_2" xml:lang="en-US">Shares issued on vesting of restricted share units (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughStockOptionsExercisedOnNetExerciseBasisShares_0" xml:lang="en-US">The Increase (decrease) in number of shares through stock options exercised on net exercise basis</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughStockOptionsExercisedOnNetExerciseBasisShares_1" xml:lang="en-US">Increase Decrease Through Stock Options Exercised On Net Exercise Basis Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughStockOptionsExercisedOnNetExerciseBasisShares_2" xml:lang="en-US">Common shares issued for stock options exercised on a net exercise basis</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseThroughVestingOfRestrictedShareUnitsAndExerciseOfStockOptionsShares_0" xml:lang="en-US">The increase (decrease) in number of shares issued during period for vesting of RSUs, and the exercise of stock options.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseThroughVestingOfRestrictedShareUnitsAndExerciseOfStockOptionsShares_1" xml:lang="en-US">Increase Decrease Through Vesting Of Restricted Share Units And Exercise Of Stock Options Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseThroughVestingOfRestrictedShareUnitsAndExerciseOfStockOptionsShares_2" xml:lang="en-US">Common shares issued for vesting of RSU and exercise of stock options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_IncreaseDecreaseValueThroughConversionOnLoanPayable_0" xml:lang="en-US">It represents increase decrease value through conversion on loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_IncreaseDecreaseValueThroughConversionOnLoanPayable_1" xml:lang="en-US">Increase Decrease Value Through Conversion On Loan Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_IncreaseDecreaseValueThroughConversionOnLoanPayable_2" xml:lang="en-US">Proceeds from issuance of common stock on conversion of debenture</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_IncreaseDecreaseValueThroughConversionOnLoanPayable_3" xml:lang="en-US">Conversion on loan payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_InducementsToLoanPayable_0" xml:lang="en-US">Represents amount of inducements to loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_InducementsToLoanPayable_1" xml:lang="en-US">Inducements To Loan Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_InducementsToLoanPayable_2" xml:lang="en-US">Inducements</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_InflectionCapitalIncMember_0" xml:lang="en-US">Inflection Capital Inc</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_InflectionCapitalIncMember_1" xml:lang="en-US">Inflection Capital Inc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_InflectionCapitalIncMember_2" xml:lang="en-US">Inflection Capital Inc.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToConversionFeature_0" xml:lang="en-US">Represents the initial advance drew down allocated to conversion feature.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToConversionFeature_1" xml:lang="en-US">Allocation of conversion feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToConversionFeature_2" xml:lang="en-US">Initial Advance Drew Down Allocated To Conversion Feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToConversionFeature_3" xml:lang="en-US">Allocation of conversion feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToLiabilityPortion_0" xml:lang="en-US">Represents the initial advance drew down allocated to liability portion.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToLiabilityPortion_1" xml:lang="en-US">Initial Advance Drew Down Allocated To Liability Portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_InitialAdvanceDrewDownAllocatedToLiabilityPortion_2" xml:lang="en-US">Allocation to liability portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_InitialAdvanceOfConvertibleLoanFacility_0" xml:lang="en-US">Represents amount of initial advance convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_InitialAdvanceOfConvertibleLoanFacility_1" xml:lang="en-US">Initial Advance Of Convertible Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_InitialAdvanceOfConvertibleLoanFacility_2" xml:lang="en-US">Initial advance of convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_InterestRateSensitivityRateUsedRevolvingCreditFacility_0" xml:lang="en-US">The percentage change in interest rate used to assess the sensitivity of pre-tax loss to a reasonably possible increase or decrease in interest rates on the revolving credit facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_InterestRateSensitivityRateUsedRevolvingCreditFacility_1" xml:lang="en-US">Interest Rate Sensitivity Rate Used, Revolving Credit Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_InterestRateSensitivityRateUsedRevolvingCreditFacility_2" xml:lang="en-US">RCF, interest rate sensitivity rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_JoaquinMember_0" xml:lang="en-US">This member stands for Joaquin.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_JoaquinMember_1" xml:lang="en-US">Joaquin [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_JoaquinMember_2" xml:lang="en-US">Joaquin and COSE impairments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_JoaquinMember_3" xml:lang="en-US">Joaquin impairment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_JoaquinProjectMember_0" xml:lang="en-US">Joaquin project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_JoaquinProjectMember_1" xml:lang="en-US">Joaquin Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_JoaquinProjectMember_2" xml:lang="en-US">Joaquin project</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_JoaquinRoyaltyMember_0" xml:lang="en-US">Represents Joaquin royalty member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_JoaquinRoyaltyMember_1" xml:lang="en-US">Joaquin Royalty [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_JoaquinRoyaltyMember_2" xml:lang="en-US">Joaquin [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_KaroraResourcesIncMember_0" xml:lang="en-US">Information of Karora Resources Inc. from the Morgan Stanley Capital Group, Inc.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_KaroraResourcesIncMember_1" xml:lang="en-US">Karora Resources Inc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_KirklandLakesMacassaAmalgamatedPropertyMember_0" xml:lang="en-US">Kirkland Lake's Macassa Amalgamated property</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_KirklandLakesMacassaAmalgamatedPropertyMember_1" xml:lang="en-US">Kirkland Lakes Macassa Amalgamated Property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_KirklandLakesMacassaAmalgamatedPropertyMember_2" xml:lang="en-US">Kirkland Lake Gold's North Amalgamated Kirkland property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LacPelletierAcquisitionMember_0" xml:lang="en-US">This member stands for Lac Pelletier acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LacPelletierAcquisitionMember_1" xml:lang="en-US">Lac Pelletier Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaEncantadaMember_0" xml:lang="en-US">La Encantada [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaEncantadaMineMember_0" xml:lang="en-US">This Member stands for the production mine.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaEncantadaMineMember_1" xml:lang="en-US">La Encantada Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaFortunaAcquisitionMember_0" xml:lang="en-US">La Fortuna acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaFortunaAcquisitionMember_1" xml:lang="en-US">La Fortuna Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LaFortunaAcquisitionMember_2" xml:lang="en-US">La Fortuna acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaFortunaNsrOptionMember_0" xml:lang="en-US">La Fortuna NSR option.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaFortunaNsrOptionMember_1" xml:lang="en-US">La Fortuna Nsr Option [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LaFortunaNsrOptionMember_2" xml:lang="en-US">La Fortuna option</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LaFortunaNsrOptionMember_3" xml:lang="en-US">La Fortuna NSR option</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaGuitarraMineMember_0" xml:lang="en-US">La Guitarra Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaGuitarraMineMember_1" xml:lang="en-US">La Guitarra Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LaGuitarraMineMember_2" xml:lang="en-US">La Guitarra [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaJoyaProjectMember_0" xml:lang="en-US">La Joya Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaJoyaProjectMember_1" xml:lang="en-US">La Joya Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaLuzProjectMember_0" xml:lang="en-US">La Luz Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaLuzProjectMember_1" xml:lang="en-US">La Luz Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LamaAcquisitionsMember_0" xml:lang="en-US">It represents as a Lama acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LamaAcquisitionsMember_1" xml:lang="en-US">Lama Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LamaAcquisitionsMember_2" xml:lang="en-US">Lama acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LamaRoyaltiesAcquisitionMember_0" xml:lang="en-US">This member stands for Lama Royalties Acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LamaRoyaltiesAcquisitionMember_1" xml:lang="en-US">Lama Royalties Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LamaRoyaltiesAcquisitionMember_2" xml:lang="en-US">Lama Royalties Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LaParrillaMineMember_0" xml:lang="en-US">La Parrilla Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LaParrillaMineMember_1" xml:lang="en-US">La Parrilla Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LegalEntitiesAxis_0" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LegalEntitiesAxis_1" xml:lang="en-US">Legal Entities [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LegalEntitiesDomain_0" xml:lang="en-US">All the entities being reported upon in a document.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LegalEntitiesDomain_1" xml:lang="en-US">Legal Entities [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ListingAndFilingFees_0" xml:lang="en-US">The amount of listing and filing fees paid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ListingAndFilingFees_1" xml:lang="en-US">Listing And Filing Fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ListingAndFilingFees_2" xml:lang="en-US">Listing and filing fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanAgreementSettled_0" xml:lang="en-US">Represents loan agreement settled.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanAgreementSettled_1" xml:lang="en-US">Loan Agreement Settled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoanAgreementSettled_2" xml:lang="en-US">Loan agreement settled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanAgreementsForAggregateAmount_0" xml:lang="en-US">Represents amount of aggregate loan agreements.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanAgreementsForAggregateAmount_1" xml:lang="en-US">Loan Agreements For Aggregate Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoanAgreementsForAggregateAmount_2" xml:lang="en-US">Loan agreements aggregate amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanAgreementsWithLendersMember_0" xml:lang="en-US">Loan Agreements With Lenders [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoanAgreementsWithLendersMember_1" xml:lang="en-US">Four loan arrangements</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanExtensionFee_0" xml:lang="en-US">Loan extension fee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanExtensionFee_1" xml:lang="en-US">Loan extension fee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanExtensionFeePercentage_0" xml:lang="en-US">Represents percentage of loan extension fee.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanExtensionFeePercentage_1" xml:lang="en-US">Loan Extension Fee Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoanExtensionFeePercentage_2" xml:lang="en-US">Loan extension fee percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanExtensionMember_0" xml:lang="en-US">Loan Extension [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoanExtensionMember_1" xml:lang="en-US">Loan Extension [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanFacilityConversionPricePerShare_0" xml:lang="en-US">Represents about loan facility conversion price per share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanFacilityConversionPricePerShare_1" xml:lang="en-US">Loan Facility Conversion Price Per Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LoanFacilityConversionPricePerShare_2" xml:lang="en-US">Loan facility, conversion price, per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanFacilityExtensionMember_0" xml:lang="en-US">This member represents about loan facility extension.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanFacilityExtensionMember_1" xml:lang="en-US">Loan Facility Extension [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanPayableAbstract_0" xml:lang="en-US">Loan Payable [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanPayableAxis_0" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanPayableAxis_1" xml:lang="en-US">Loan Payable [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanPayableDomain_0" xml:lang="en-US">Loan Payable [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanPayableLineItems_0" xml:lang="en-US">Loan Payable [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoanPayableTable_0" xml:lang="en-US">Schedule disclosing information related to loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoanPayableTable_1" xml:lang="en-US">Loan Payable [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoansPayablesMember_0" xml:lang="en-US">Loans Payables Member</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoansPayablesMember_1" xml:lang="en-US">Loans Payable [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoansPayableTransactionCosts_0" xml:lang="en-US">Represents the loans payable transaction costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_LoansPayableTransactionCosts_1" xml:lang="en-US">Transaction costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoansPayableTransactionCosts_2" xml:lang="en-US">Loans Payable Transaction Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LoansPayableTransactionCosts_3" xml:lang="en-US">Transaction costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LoansSettlement_0" xml:lang="en-US">Represents amount of settlements of loan.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_LoansSettlement_1" xml:lang="en-US">Settlements</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LoansSettlement_2" xml:lang="en-US">Loans Settlement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LoansSettlement_3" xml:lang="en-US">Settlements</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LongTermDebtRepaymentOfTransaction_0" xml:lang="en-US">It represents long term debt repayment of transaction.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LongTermDebtRepaymentOfTransaction_1" xml:lang="en-US">Long Term Debt Repayment Of Transaction</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LongTermDebtRepaymentOfTransaction_2" xml:lang="en-US">Nova long-term debt repaid as part of transaction</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LosPlatosProjectNsrMember_0" xml:lang="en-US">Los Platos project NSR.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LosPlatosProjectNsrMember_1" xml:lang="en-US">Los Platos Project Nsr [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_LosPlatosProjectNsrMember_2" xml:lang="en-US">Los Platos</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LosPlatosProjectNsrMember_3" xml:lang="en-US">Los Platos project NSR</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_LossOnSettlementOfLoanAgreement_0" xml:lang="en-US">Represents amount related to loss on settlement of loan agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_LossOnSettlementOfLoanAgreement_1" xml:lang="en-US">Loss On Settlement Of Loan Agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_LossOnSettlementOfLoanAgreement_2" xml:lang="en-US">Loss on settlement of loan agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MaritimeResourcesCorpMember_0" xml:lang="en-US">This member stands for Maritime Resources Corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MaritimeResourcesCorpMember_1" xml:lang="en-US">Maritime Resources Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MaritimeResourcesCorpMember_2" xml:lang="en-US">Lac Pelletier Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/commentaryGuidance" xlink:label="lab_mta_MarketableSecuritiesMeasuredAtFvtpl_0" xml:lang="en-US">This element should be used to tag non-restated comparative information only.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MarketableSecuritiesMeasuredAtFvtpl_1" xml:lang="en-US">Represents the amount of marketable securities.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_MarketableSecuritiesMeasuredAtFvtpl_2" xml:lang="en-US">Marketable securities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MarketableSecuritiesMeasuredAtFvtpl_3" xml:lang="en-US">Marketable Securities Measured At Fvtpl</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MarketableSecuritiesMeasuredAtFvtpl_4" xml:lang="en-US">Marketable securities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MarketValueOfSharesIssued_0" xml:lang="en-US">It represents market value of shares issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MarketValueOfSharesIssued_1" xml:lang="en-US">Market Value Of Shares Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MarketValueOfSharesIssued_2" xml:lang="en-US">Market value of Metalla Shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MatamecAcquisitionsMember_0" xml:lang="en-US">Matamec acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MatamecAcquisitionsMember_1" xml:lang="en-US">Matamec Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MatamecAcquisitionsMember_2" xml:lang="en-US">Matamec acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MaturityDate_0" xml:lang="en-US">Represent the maturity date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MaturityDate_1" xml:lang="en-US">Maturity Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MaturityDate_2" xml:lang="en-US">Maturity date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MaximumCappingOfNetSmelterReturnNsr_0" xml:lang="en-US">Represents maximum amount of capping of NSR (NSR).</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MaximumCappingOfNetSmelterReturnNsr_1" xml:lang="en-US">Maximum Capping Of Net Smelter Return (Nsr)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MaximumCappingOfNetSmelterReturnNsr_2" xml:lang="en-US">Maximum capping of NSR</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MaximumCappingOfUnsecuredNetSmelterReturnNsr_0" xml:lang="en-US">Represents maximum amount of capping of unsecured NSR.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MaximumCappingOfUnsecuredNetSmelterReturnNsr_1" xml:lang="en-US">Maximum Capping Of Unsecured Net Smelter Return (Nsr)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MaximumCappingOfUnsecuredNetSmelterReturnNsr_2" xml:lang="en-US">Maximum capping of unsecured NSR</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MaximumNumberOfRestrictedShareUnitsReservedForIssuance_0" xml:lang="en-US">Maximum number of restricted share units reserved for issuance.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MaximumNumberOfRestrictedShareUnitsReservedForIssuance_1" xml:lang="en-US">Maximum Number Of Restricted Share Units Reserved For Issuance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MaximumNumberOfRestrictedShareUnitsReservedForIssuance_2" xml:lang="en-US">Maximum number of restricted share units reserved for issuance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_May2021Member_0" xml:lang="en-US">May 2021</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_May2021Member_1" xml:lang="en-US">May 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_May2021Member_2" xml:lang="en-US">May 2021 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MayfairGoldCorpMember_0" xml:lang="en-US">This member stands for Mayfair Gold Corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MayfairGoldCorpMember_1" xml:lang="en-US">Mayfair Gold Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MineralExpendituresAndCapitalAssetsMember_0" xml:lang="en-US">This member stands for Mineral expenditures and capital assets.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MineralExpendituresAndCapitalAssetsMember_1" xml:lang="en-US">Mineral Expenditures And Capital Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MineralExpendituresAndCapitalAssetsMember_2" xml:lang="en-US">Mineral expenditures and capital assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MineralExpendituresAndCapitalAssetsMember_3" xml:lang="en-US">Mineral expenditures and other capital assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_mta_MineralInterestsRecognisedAsOfAcquisitionDate_0" xml:lang="en-US">Common shares issued for acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveVerboseLabel" xlink:label="lab_mta_MineralInterestsRecognisedAsOfAcquisitionDate_1" xml:lang="en-US">Mineral interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MineralInterestsRecognisedAsOfAcquisitionDate_2" xml:lang="en-US">Mineral Interests Recognised As Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MineralInterestsRecognisedAsOfAcquisitionDate_3" xml:lang="en-US">Common shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MineralInterestsRecognisedAsOfAcquisitionDate_4" xml:lang="en-US">Value of common shares issued as consideration</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MineraTritonArgentinaMember_0" xml:lang="en-US">Minera Triton Argentina.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MineraTritonArgentinaMember_1" xml:lang="en-US">Minera Triton Argentina [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MineraTritonArgentinaMember_2" xml:lang="en-US">Minera Triton Argentina</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MinimumAdvanceDrawnFromAdditionalLoanFacility_0" xml:lang="en-US">Minimum advance drawn from additional loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MinimumAdvanceDrawnFromAdditionalLoanFacility_1" xml:lang="en-US">Minimum Advance Drawn From Additional Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MinimumAdvanceDrawnFromAdditionalLoanFacility_2" xml:lang="en-US">Minimum advance drawn from additional loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MinimumAdvanceDrawnFromConvertibleLoanFacility_0" xml:lang="en-US">Represents minimum advance drawn from convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MinimumAdvanceDrawnFromConvertibleLoanFacility_1" xml:lang="en-US">Minimum advance drawn from convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MinimumTranchesOfConvertibleLoanFacility_0" xml:lang="en-US">Represents amount of minimum tranches of convertible loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MinimumTranchesOfConvertibleLoanFacility_1" xml:lang="en-US">Minimum Tranches Of Convertible Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MinimumTranchesOfConvertibleLoanFacility_2" xml:lang="en-US">Minimum tranches of convertible loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MiradoMineProjectMember_0" xml:lang="en-US">Mirado Mine Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MiradoMineProjectMember_1" xml:lang="en-US">Mirado mine project (Mirado)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ModificationOfLoanFacility_0" xml:lang="en-US">Amount of Modification of loan facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ModificationOfLoanFacility_1" xml:lang="en-US">Modification Of Loan Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ModificationOfLoanFacility_2" xml:lang="en-US">Modification of loan facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MonarchMiningCorporationMember_0" xml:lang="en-US">Monarch Mining Corporation Member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MonarchMiningCorporationMember_1" xml:lang="en-US">Monarch Mining Corporation [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MonarchMiningCorporationsMember_0" xml:lang="en-US">This member stands for Monarch Mining Corporation's.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MonarchMiningCorporationsMember_1" xml:lang="en-US">Monarch Mining Corporations [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_MonarchMiningCorporationsMember_2" xml:lang="en-US">Monarch [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_MontclergPropertyMember_0" xml:lang="en-US">Montclerg property.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_MontclergPropertyMember_1" xml:lang="en-US">Montclerg Property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_MontclergPropertyMember_2" xml:lang="en-US">Montclerg property</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NatureOfOperationsAbstract_0" xml:lang="en-US">Nature of Operations [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NatureOfOperationsAbstract_1" xml:lang="en-US">Nature of Operations [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturn_0" xml:lang="en-US">Net Smelter Return.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturn_1" xml:lang="en-US">Net Smelter Return</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturn_2" xml:lang="en-US">Net smelter return</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquiredCappedAmount_0" xml:lang="en-US">Represents the net smelter return acquired capped amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredCappedAmount_1" xml:lang="en-US">Net Smelter Return Acquired Capped Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredCappedAmount_2" xml:lang="en-US">Net smelter return acquired capped amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquiredCappedPercentage_0" xml:lang="en-US">It represents net smelter return acquired capped percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredCappedPercentage_1" xml:lang="en-US">Net Smelter Return Acquired Capped Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredCappedPercentage_2" xml:lang="en-US">Net smelter return acquired capped percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentage_0" xml:lang="en-US">Net Smelter Return (NSR) acquired percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentage_1" xml:lang="en-US">Net Smelter Return Acquired Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentage_2" xml:lang="en-US">Percentage of NSR royalty interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageOpenPitOperations_0" xml:lang="en-US">Net Smelter Return Acquired Percentage Open Pit Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageOpenPitOperations_1" xml:lang="en-US">Percentage of NSR royalty interest - open pit operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageSold_0" xml:lang="en-US">Net Smelter Return Acquired Percentage sold.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageSold_1" xml:lang="en-US">Net Smelter Return Acquired Percentage Sold</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageSold_2" xml:lang="en-US">Percentage of NSR royalty interest sold</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageUndergroundOperations_0" xml:lang="en-US">Net Smelter Return Acquired Percentage Underground Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredPercentageUndergroundOperations_1" xml:lang="en-US">Percentage of NSR royalty interest - underground operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquiredUncappedAdditionPercentage_0" xml:lang="en-US">It represents net smelter return acquired capped addition percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredUncappedAdditionPercentage_1" xml:lang="en-US">Net Smelter Return Acquired Uncapped Addition Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredUncappedAdditionPercentage_2" xml:lang="en-US">Net smelter return acquired uncapped addition percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquiredUncappedIncreaseInPercentage_0" xml:lang="en-US">It represents net smelter return acquired capped increase in percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquiredUncappedIncreaseInPercentage_1" xml:lang="en-US">Net Smelter Return Acquired Uncapped Increase In Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquiredUncappedIncreaseInPercentage_2" xml:lang="en-US">Net smelter return acquired uncapped increase in percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnAcquisitionRange_0" xml:lang="en-US">Description of Net smelter (NSR) acquisition rage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnAcquisitionRange_1" xml:lang="en-US">Net Smelter Return Acquisition Range</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NetSmelterReturnAcquisitionRange_2" xml:lang="en-US">Net smelter return acquisition range, Description</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NetSmelterReturnInterestsAcquired_0" xml:lang="en-US">Represents net smelter return interests acquired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NetSmelterReturnInterestsAcquired_1" xml:lang="en-US">Net Smelter Return Interests Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NetSmelterReturnInterestsAcquired_2" xml:lang="en-US">NSR interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NewPathResourcesIncMember_0" xml:lang="en-US">This member stands for New Path Resources Inc.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NewPathResourcesIncMember_1" xml:lang="en-US">New Path Resources Inc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NoExpiryDateMember_0" xml:lang="en-US">This member stands for no expiry date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NoExpiryDateMember_1" xml:lang="en-US">No expiry date [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NonCapitalLossesAndOtherMember_0" xml:lang="en-US">This member stands for Non-capital losses and other.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NonCapitalLossesAndOtherMember_1" xml:lang="en-US">Non Capital Losses And Other [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NonCapitalLossesAndOtherMember_2" xml:lang="en-US">Non-capital losses and others [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NonCapitalLossesAndOtherMember_3" xml:lang="en-US">Non-capital losses and others [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NorthAmalgamatedKirklandPropertyMember_0" xml:lang="en-US">This member stands for North Amalgamated Kirkland property.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NorthAmalgamatedKirklandPropertyMember_1" xml:lang="en-US">North Amalgamated Kirkland Property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NorthAmalgamatedKirklandPropertyMember_2" xml:lang="en-US">North Amalgamated Kirkland property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NorthshoreWestPropertyMember_0" xml:lang="en-US">This member stands for Northshore West property.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NorthshoreWestPropertyMember_1" xml:lang="en-US">Northshore West Property [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NovaLoanFacilityMember_0" xml:lang="en-US">This member stands for Nova Loan Facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NovaLoanFacilityMember_1" xml:lang="en-US">Nova Loan Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NovaRoyaltyCorpMember_0" xml:lang="en-US">This member stands for nova royalty corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NovaRoyaltyCorpMember_1" xml:lang="en-US">Nova Royalty Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NovaRoyaltyCorpMember_2" xml:lang="en-US">Nova Royalty Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NovaRoyaltyCorpMember_3" xml:lang="en-US">Nova portfolio acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NuevaunionAcquisitionMember_0" xml:lang="en-US">NuevaUnion acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NuevaunionAcquisitionMember_1" xml:lang="en-US">Nuevaunion Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NuevaunionAcquisitionMember_2" xml:lang="en-US">NuevaUni&#243;n acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NuevaunionAcquisitionMember_3" xml:lang="en-US">NuevaUni&#243;n [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfBulkTonnageModel_0" xml:lang="en-US">It represents number of bulk tonnage model.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfBulkTonnageModel_1" xml:lang="en-US">Number Of Bulk Tonnage Model</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfBulkTonnageModel_2" xml:lang="en-US">Number of bulk tonnage model (in tonnes)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommittedSharesNotIssued_0" xml:lang="en-US">Represents the number of committed shares not issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommittedSharesNotIssued_1" xml:lang="en-US">Number Of Committed Shares Not Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfCommittedSharesNotIssued_2" xml:lang="en-US">Committed shares not issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommonSharesAcquisition_0" xml:lang="en-US"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommonSharesAcquisition_1" xml:lang="en-US">Number Of Common Shares Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfCommonSharesAcquisition_2" xml:lang="en-US">Number of common shares acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests_0" xml:lang="en-US">Represents the number of common shares issued for acquisitions of royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests_1" xml:lang="en-US">Number Of Common Shares Issued For Acquisitions Of Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests_2" xml:lang="en-US">Acquisition of royalty interests (in shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests_3" xml:lang="en-US">Number of common shares issued for acquisitions of royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommonSharesIssuedForNetAssetsAcquired_0" xml:lang="en-US">Represents the number of common shares issued for net assets acquired, as non-cash investing and financing activities.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommonSharesIssuedForNetAssetsAcquired_1" xml:lang="en-US">Number Of Common Shares Issued For Net Assets Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfCommonSharesIssuedForNetAssetsAcquired_2" xml:lang="en-US">Number of common shares and convertible debenture issued for net assets acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommonSharesIssuedForVestingOfRestrictedStockUnits_0" xml:lang="en-US">Represents the number of common shares issued for vesting of restricted stock units.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommonSharesIssuedForVestingOfRestrictedStockUnits_1" xml:lang="en-US">Number Of Common Shares Issued For Vesting Of Restricted Stock Units.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfCommonSharesIssuedForVestingOfRestrictedStockUnits_2" xml:lang="en-US">Number of common shares issued for vesting of RSU</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommonSharesReceivedForExchangeRatio_0" xml:lang="en-US">Represents number of common shares received for exchange ratio.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommonSharesReceivedForExchangeRatio_1" xml:lang="en-US">Number Of Common Shares Received For Exchange Ratio</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfCommonSharesReceivedForExchangeRatio_2" xml:lang="en-US">Number of common shares received for exchange ratio</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts_0" xml:lang="en-US">Represents the number of common shares warrants issued as deferred acquisition costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts_1" xml:lang="en-US">Number Of Common Shares Warrants Issued As Deferred Acquisition Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts_2" xml:lang="en-US">Deferred acquisition costs (in shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts_3" xml:lang="en-US">Number of common shares warrants issued as deferred acquisition costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfDirector_0" xml:lang="en-US">Represents the number of directors.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfDirector_1" xml:lang="en-US">Number Of Director</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfDirector_2" xml:lang="en-US">Number of director</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfFindersWarrantsIssued_0" xml:lang="en-US">Represents the number of finders warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfFindersWarrantsIssued_1" xml:lang="en-US">Number Of Finders Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfFindersWarrantsIssued_2" xml:lang="en-US">Number of underwriter warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfFindersWarrantsIssued_3" xml:lang="en-US">Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfGoldOunces_0" xml:lang="en-US">Number of gold ounces.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfGoldOunces_1" xml:lang="en-US">Number Of Gold Ounces</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfGoldOunces_2" xml:lang="en-US">Number of gold ounces</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfGoldOuncesRemainingToBeDelivered_0" xml:lang="en-US">Number of gold ounces remaining to be delivered.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfGoldOuncesRemainingToBeDelivered_1" xml:lang="en-US">Number Of Gold Ounces Remaining To Be Delivered</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfGoldOuncesRemainingToBeDelivered_2" xml:lang="en-US">Number of gold ounces remaining to be delivered</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfInferredResourceInOunces_0" xml:lang="en-US">It represents number of inferred resource in ounces.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfInferredResourceInOunces_1" xml:lang="en-US">Number Of Inferred Resource In Ounces</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfInferredResourceInOunces_2" xml:lang="en-US">Number of inferred resource (in Ounces)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfMetallaSharesIssuedToNovaRsuHolders_0" xml:lang="en-US">Number Of Metalla Shares Issued To Nova Rsu Holders</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfMetallaSharesIssuedToNovaRsuHolders_1" xml:lang="en-US">Number of Metalla Shares issued to Nova RSU holders</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfMetallaSharesIssuedToNovaShareholders_0" xml:lang="en-US">Number of Metalla Shares issued to Nova shareholders</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfNsrInterestsAcquired_0" xml:lang="en-US">Number of NSR interests acquired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfNsrInterestsAcquired_1" xml:lang="en-US">Number Of Nsr Interests Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfNsrInterestsAcquired_2" xml:lang="en-US">Number NSR interests acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfOtherEquityInstrumentsExercisedInSharebasedPaymentArrangement_0" xml:lang="en-US">The number of other equity instruments (ie other than share options) exercised in a share-based payment arrangement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:label="lab_mta_NumberOfOtherEquityInstrumentsExercisedInSharebasedPaymentArrangement_1" xml:lang="en-US">Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfOtherEquityInstrumentsExercisedInSharebasedPaymentArrangement_2" xml:lang="en-US">Number Of Other Equity Instruments Exercised In Sharebased Payment Arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfOutstandingWarrants_0" xml:lang="en-US">Number of warrants outstanding in share-based payment arrangement at beginning of period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_mta_NumberOfOutstandingWarrants_1" xml:lang="en-US">Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_mta_NumberOfOutstandingWarrants_2" xml:lang="en-US">Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfOutstandingWarrants_3" xml:lang="en-US">Number Of Outstanding Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfOutstandingWarrants_4" xml:lang="en-US">Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfPostConsolidationCommonShares_0" xml:lang="en-US">Detail information about post consolidation common share result.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfPostConsolidationCommonShares_1" xml:lang="en-US">Number Of Post Consolidation Common Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfPostConsolidationCommonShares_2" xml:lang="en-US">Number of post-consolidation common shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfPreConsolidationCommonShares_0" xml:lang="en-US">Detail information about pre consolidation common share result.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfPreConsolidationCommonShares_1" xml:lang="en-US">Number Of Pre Consolidation Common Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfPreConsolidationCommonShares_2" xml:lang="en-US">Number of pre-consolidation common shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfRoyaltyInterest_0" xml:lang="en-US">Number of royalty interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfRoyaltyInterest_1" xml:lang="en-US">Number Of Royalty Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfRoyaltyInterest_2" xml:lang="en-US">Number of royalty interest acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfShareOptionsIssuedInShareBasedPaymentArrangement_0" xml:lang="en-US">Represent the number of share options issued in share-based payment arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfShareOptionsIssuedInShareBasedPaymentArrangement_1" xml:lang="en-US">Number Of Share Options Issued In Share Based Payment Arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfShareOptionsIssuedInShareBasedPaymentArrangement_2" xml:lang="en-US">Issued as part of Nova Transaction</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsExercised_0" xml:lang="en-US">Represents the number of share purchase warrants exercised.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsExercised_1" xml:lang="en-US">Number of share purchase warrants exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsExercised_2" xml:lang="en-US">Number Of Share Purchase Warrants Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsExercised_3" xml:lang="en-US">Number of share purchase warrants exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable_0" xml:lang="en-US">The number of share purchase warrants issued on settlement of loans payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable_1" xml:lang="en-US">Number Of Share Purchase Warrants Issued On Settlement Of Loans Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable_2" xml:lang="en-US">Number of share purchase warrants issued on settlement of loans payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriod_0" xml:lang="en-US">The number of shares issued during period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriod_1" xml:lang="en-US">Number Of Shares Issued During Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriod_2" xml:lang="en-US">Number of shares issued during period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriodForExerciseOfSharePurchaseWarrants_0" xml:lang="en-US">The number of shares issued during period for exercise of share purchase warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriodForExerciseOfSharePurchaseWarrants_1" xml:lang="en-US">Number Of Shares Issued During Period For Exercise Of Share Purchase Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriodForExerciseOfSharePurchaseWarrants_2" xml:lang="en-US">Number of shares issued during period for exercise of share purchase warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriodValue_0" xml:lang="en-US">Value of shares issued during period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriodValue_1" xml:lang="en-US">Number Of Shares Issued During Period Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharesIssuedDuringPeriodValue_2" xml:lang="en-US">Value of shares issued during period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharesIssuedForAcquisitionRoyaltyInterest_0" xml:lang="en-US">Number of shares issued for acquisition royalty interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharesIssuedForAcquisitionRoyaltyInterest_1" xml:lang="en-US">Number Of Shares Issued For Acquisition Royalty Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfSharesIssuedForAcquisitionRoyaltyInterest_2" xml:lang="en-US">Number of shares issued for acquisition royalty interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharesIssuedInAtmDuringPeriodValue_0" xml:lang="en-US">It represents number of shares issued in ATM during period value.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharesIssuedInAtmDuringPeriodValue_1" xml:lang="en-US">Number Of Shares Issued In Atm During Period Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfSharesIssuedInAtmDuringPeriodValue_2" xml:lang="en-US">Shares issued in ATM, net of issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharesIssuedInAtmDuringPeriodValue_3" xml:lang="en-US">Value of shares issued in ATM</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSharesIssueInAtMarket_0" xml:lang="en-US">It represents number of shares issue in At Market.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSharesIssueInAtMarket_1" xml:lang="en-US">Number Of Shares Issue In At Market</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfSharesIssueInAtMarket_2" xml:lang="en-US">Shares issued in ATM, net of issue costs (in shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSharesIssueInAtMarket_3" xml:lang="en-US">Number of shares issue in ATM</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfSilverStreamInterests_0" xml:lang="en-US">Number of silver stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfSilverStreamInterests_1" xml:lang="en-US">Number Of Silver Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfSilverStreamInterests_2" xml:lang="en-US">Number of silver stream interests acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfUnderwritersWarrantsIssued_0" xml:lang="en-US">Represents the number of underwriter's warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfUnderwritersWarrantsIssued_1" xml:lang="en-US">Number Of Underwriters Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfUnderwritersWarrantsIssued_2" xml:lang="en-US">Number of underwriter's warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfWarrantsExercised_0" xml:lang="en-US">It represents as a number of warrants exercised.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_NumberOfWarrantsExercised_1" xml:lang="en-US">Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfWarrantsExercised_2" xml:lang="en-US">Number Of Warrants Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfWarrantsExercised_3" xml:lang="en-US">Exercise of share purchase and finder's warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfWarrantsExpired_0" xml:lang="en-US">It represents as a number of warrants expired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_NumberOfWarrantsExpired_1" xml:lang="en-US">Expired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfWarrantsExpired_2" xml:lang="en-US">Number Of Warrants Expired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfWarrantsExpired_3" xml:lang="en-US">Expired/Cancelled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_NumberOfWarrantsIssued_0" xml:lang="en-US">Information about number of warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_NumberOfWarrantsIssued_1" xml:lang="en-US">Number Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_NumberOfWarrantsIssued_2" xml:lang="en-US">Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_NumberOfWarrantsIssued_3" xml:lang="en-US">Number of warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OnClosingMember_0" xml:lang="en-US">On Closing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OnClosingMember_1" xml:lang="en-US">On Closing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OnClosingMember_2" xml:lang="en-US">On Closing/Signing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OneYearMemberMember_0" xml:lang="en-US">This member represents one year member</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OneYearMemberMember_1" xml:lang="en-US">One Year Member [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OneYearMemberMember_2" xml:lang="en-US">First year [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OperatingCostContributionPricePerOunce_0" xml:lang="en-US">Operating cost contribution price per ounce.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OperatingCostContributionPricePerOunce_1" xml:lang="en-US">Operating Cost Contribution Price Per Ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OperatingCostContributionPricePerOunce_2" xml:lang="en-US">Operating cost contribution price per ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OrefindersAcquisitionsMember_0" xml:lang="en-US">Orefinders acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OrefindersAcquisitionsMember_1" xml:lang="en-US">Orefinders Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OrefindersAcquisitionsMember_2" xml:lang="en-US">Orefinders acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OrionMember_0" xml:lang="en-US">Orion [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OrionMember_1" xml:lang="en-US">Orion [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OrionNsrRoyaltyMember_0" xml:lang="en-US">Represents information of Orion NSR royalty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OrionNsrRoyaltyMember_1" xml:lang="en-US">Orion Nsr Royalty [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OrionNsrRoyaltyMember_2" xml:lang="en-US">Orion NSR royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherAcquisitionCostsOfRoyaltyAndStreamInterests_0" xml:lang="en-US">Other acquisition costs of Royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_OtherAcquisitionCostsOfRoyaltyAndStreamInterests_1" xml:lang="en-US">Reclassification (Joaquin and COSE)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherAcquisitionCostsOfRoyaltyAndStreamInterests_2" xml:lang="en-US">Other Acquisition Costs Of Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OtherAcquisitionCostsOfRoyaltyAndStreamInterests_3" xml:lang="en-US">COSE reclassification</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherAdditionsRoyaltyAndStreamInterests_0" xml:lang="en-US">Amount of other additions in royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherAdditionsRoyaltyAndStreamInterests_1" xml:lang="en-US">Other Additions Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OtherAdditionsRoyaltyAndStreamInterests_2" xml:lang="en-US">Reclassifications and other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherCommitmentMember_0" xml:lang="en-US">Represents other commitment member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherCommitmentMember_1" xml:lang="en-US">Other Commitment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OtherCommitmentMember_2" xml:lang="en-US">Other</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherGeographicalAreasMember_0" xml:lang="en-US">Represent the other geographical areas member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherGeographicalAreasMember_1" xml:lang="en-US">Other Geographical Areas [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OtherGeographicalAreasMember_2" xml:lang="en-US">Other [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherLoanPayableMember_0" xml:lang="en-US">This member stands for other loan payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherLoanPayableMember_1" xml:lang="en-US">Other Loan Payable [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OtherLoanPayableMember_2" xml:lang="en-US">Other loans [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherMember_0" xml:lang="en-US">Other [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherMember_1" xml:lang="en-US">Other [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OtherRoyaltyInterestsMember_0" xml:lang="en-US">Other royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OtherRoyaltyInterestsMember_1" xml:lang="en-US">Other Royalty Interests [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OtherRoyaltyInterestsMember_2" xml:lang="en-US">Other royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OutstandingPaymentOfFairValueAcquisitionDate_0" xml:lang="en-US">It represents outstanding payment of fair value acquisition date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OutstandingPaymentOfFairValueAcquisitionDate_1" xml:lang="en-US">Outstanding Payment Of Fair Value Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OutstandingPaymentOfFairValueAcquisitionDate_2" xml:lang="en-US">Outstanding payment of fair value acquisition date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_OutstandingPrincipalAmount_0" xml:lang="en-US">Amount of outstanding principal amount.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_OutstandingPrincipalAmount_1" xml:lang="en-US">Outstanding Principal Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_OutstandingPrincipalAmount_2" xml:lang="en-US">Outstanding principal amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PaidInKindInterests_0" xml:lang="en-US">Pecentage of paid in kind interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PaidInKindInterests_1" xml:lang="en-US">Paid In Kind Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PaidInKindInterests_2" xml:lang="en-US">Paid-in-kind interest rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PanAmericanSilverCorporationMember_0" xml:lang="en-US">This member stands for Pan American Silver Corporation.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PanAmericanSilverCorporationMember_1" xml:lang="en-US">Pan American Silver Corporation [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_Payable60DaysAfterClosingMember_0" xml:lang="en-US">Payable 60 days after closing.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_Payable60DaysAfterClosingMember_1" xml:lang="en-US">Payable 60 Days After Closing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_Payable60DaysAfterClosingMember_2" xml:lang="en-US">Payable 60 days after closing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PayablesOnAcquisitions_0" xml:lang="en-US">The amount of payables for the acquisitions..</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PayablesOnAcquisitions_1" xml:lang="en-US">Payables On Acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PayablesOnAcquisitions_2" xml:lang="en-US">Payables on acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PayableUponAchievementOfCommercialProductionMember_0" xml:lang="en-US">Payable upon the achievement of commercial production [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PayableUponAchievementOfCommercialProductionMember_1" xml:lang="en-US">Payable Upon Achievement Of Commercial Production [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PayableUponAchievementOfCommercialProductionMember_2" xml:lang="en-US">Payable upon the achievement of commercial production/certain milestones [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PaymentDateAxis_0" xml:lang="en-US">Information of payment made.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PaymentDateAxis_1" xml:lang="en-US">Payment Date [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PaymentDateDomain_0" xml:lang="en-US">Information of payment made.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PaymentDateDomain_1" xml:lang="en-US">Payment Date [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PaymentMadeOnClosingMember_0" xml:lang="en-US">Payment made upon closing.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PaymentMadeOnClosingMember_1" xml:lang="en-US">Payment Made On Closing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PaymentMadeOnClosingMember_2" xml:lang="en-US">Paid on closing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PaymentsOfMilestone_0" xml:lang="en-US">It represents payment of milestone</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PaymentsOfMilestone_1" xml:lang="en-US">Payments Of Milestone</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PaymentsOfMilestone_2" xml:lang="en-US">Payments of milestone</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PaymentsReceivedFromDerivativeRoyaltyAsset_0" xml:lang="en-US">The cash inflow from payment received from derivative royalty asset.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PaymentsReceivedFromDerivativeRoyaltyAsset_1" xml:lang="en-US">Payments Received From Derivative Royalty Asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PaymentsReceivedFromDerivativeRoyaltyAsset_2" xml:lang="en-US">Payments received from derivative royalty asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageIncrementsOfExceededSilverPricePerOunce_0" xml:lang="en-US">Incremental percentage of exceeded silver price per ounce.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageIncrementsOfExceededSilverPricePerOunce_1" xml:lang="en-US">Percentage Increments Of Exceeded Silver Price Per Ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageIncrementsOfExceededSilverPricePerOunce_2" xml:lang="en-US">Incremental percentage of exceeded silver price per ounce</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfAdditionalInterestAcquired_0" xml:lang="en-US">Represents percentage of additional interest acquired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfAdditionalInterestAcquired_1" xml:lang="en-US">Percentage Of Additional Interest Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageOfAdditionalInterestAcquired_2" xml:lang="en-US">Percentage of additional interest acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfCashAndCommonSharesPay_0" xml:lang="en-US">Represents percentage of cash and common shares need to pay by company.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfCashAndCommonSharesPay_1" xml:lang="en-US">Percentage Of Cash And Common Shares Pay</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PercentageOfCashAndCommonSharesPay_2" xml:lang="en-US">Percentage of total consideration</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply_0" xml:lang="en-US">Represents percentage of equity ownership other company needs to maintain in order for automatic conversion to apply.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply_1" xml:lang="en-US">Percentage Of Equity Ownership Other Company Needs To Maintain In Order For Automatic Conversion To Apply</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply_2" xml:lang="en-US">Percentage of equity ownership other company needs to maintain in order for automatic conversion to apply</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance_0" xml:lang="en-US">Percentage of maximum number of RSU shares that may be reserved for issuance under the plan.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance_1" xml:lang="en-US">Percentage Of Maximum Number Of Restricted Share Units Shares Reserved For Issuance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance_2" xml:lang="en-US">Percentage of maximum number of RSU shares reserved for issuance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderStockOptionPlan_0" xml:lang="en-US">Percentage of maximum number of shares that may be reserved for issuance under the stock option plan.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderStockOptionPlan_1" xml:lang="en-US">Percentage Of Maximum Number Of Shares Reserved For Issuance Under Stock Option Plan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderStockOptionPlan_2" xml:lang="en-US">Percentage of maximum number of shares reserved for issuance under stock option plan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfMaximumNumberOfSharesThatMayBeReservedForIssuanceUnderRsuPlan_0" xml:lang="en-US">Percentage of maximum number of shares that may be reserved for issuance under the RSU plan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfMaximumNumberOfSharesThatMayBeReservedForIssuanceUnderRsuPlan_1" xml:lang="en-US">Percentage Of Maximum Number Of Shares That May Be Reserved For Issuance Under Rsu Plan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PercentageOfMaximumNumberOfSharesThatMayBeReservedForIssuanceUnderRsuPlan_2" xml:lang="en-US">Percentage of maximum number of shares reserved for issuance under RSU plan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfNsrRoyaltyInterestGold_0" xml:lang="en-US">Percentage Of Nsr Royalty Interest - Gold</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageOfNsrRoyaltyInterestGold_1" xml:lang="en-US">Percentage of NSR royalty interest - gold</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfNsrRoyaltyInterestOtherMetals_0" xml:lang="en-US">Percentage Of Nsr Royalty Interest - Other Metals</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PercentageOfNsrRoyaltyInterestOtherMetals_1" xml:lang="en-US">Percentage of NSR royalty interest - other metals</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfPriceParticipationRoyaltyInterest_0" xml:lang="en-US">Percentage of price participation royalty ("PPR") interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfPriceParticipationRoyaltyInterest_1" xml:lang="en-US">Percentage Of Price Participation Royalty Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PercentageOfPriceParticipationRoyaltyInterest_2" xml:lang="en-US">Percentage of price participation royalty interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageOfRemainingPaymentInterestUntilFullyRepaid_0" xml:lang="en-US">It represents percentage of remaining payment interest until fully repaid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageOfRemainingPaymentInterestUntilFullyRepaid_1" xml:lang="en-US">Percentage Of Remaining Payment Interest Until Fully Repaid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PercentageOfRemainingPaymentInterestUntilFullyRepaid_2" xml:lang="en-US">Percentage of remaining payment interest until fully repaid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PercentageRightToBuySilverProduction_0" xml:lang="en-US">Percentage right to buy silver pruduction.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PercentageRightToBuySilverProduction_1" xml:lang="en-US">Percentage Right To Buy Silver Production</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PercentageRightToBuySilverProduction_2" xml:lang="en-US">Percentage right to buy silver pruduction</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PerSharePriceOfConversionOfUsDollarToAustralianDollarExchangeRate_0" xml:lang="en-US">Per share price of conversion of U.s. Dollar To Australian dollar exchange rate.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PerSharePriceOfConversionOfUsDollarToAustralianDollarExchangeRate_1" xml:lang="en-US">Per Share Price Of Conversion Of Us Dollar To Australian Dollar Exchange Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PerSharePriceOfConversionOfUsDollarToAustralianDollarExchangeRate_2" xml:lang="en-US">Per share price of conversion of U.S. dollar to Australian dollar exchange rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PerShareToPremiumConversionPercentage_0" xml:lang="en-US">Represents about per share to premium conversion percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PerShareToPremiumConversionPercentage_1" xml:lang="en-US">Per Share To Premium Conversion Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PerShareToPremiumConversionPercentage_2" xml:lang="en-US">Per share to premium conversion percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PineValleyMember_0" xml:lang="en-US">Pine Valley [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PineValleyMember_1" xml:lang="en-US">Pine Valley [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PlatinexIncMember_0" xml:lang="en-US">This member stands for Platinex Inc.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PlatinexIncMember_1" xml:lang="en-US">Platinex Inc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PlomosasProjectMember_0" xml:lang="en-US">Plomosas Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PlomosasProjectMember_1" xml:lang="en-US">Plomosas Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PremiumPercentageToVolumeWeightedAveragePrice_0" xml:lang="en-US">Represents premium percentage to Volume Weighted Average Price ("VWAP").</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PremiumPercentageToVolumeWeightedAveragePrice_1" xml:lang="en-US">Premium Percentage To Volume Weighted Average Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PremiumPercentageToVolumeWeightedAveragePrice_2" xml:lang="en-US">Premium percentage to 30-day Volume Weighted Average Price ("VWAP")</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PresidentAndCeoMember_0" xml:lang="en-US">President is first or second ranking officer of the entity that may be appointed by the board of directors and CEO is the highest ranking executive officer, who has ultimate managerial responsibility for the entity and who reports to the board of directors.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PresidentAndCeoMember_1" xml:lang="en-US">President And Ceo [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PresidentAndCeoMember_2" xml:lang="en-US">President and CEO</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition_0" xml:lang="en-US">It represents share purchase warrant outstanding exercisable acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition_1" xml:lang="en-US">Price Per Share Purchase Warrant Outstanding Exercisable Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition_2" xml:lang="en-US">Exercise price per share purchase warrant outstanding exercisable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PrincipalAmountOfLoan_0" xml:lang="en-US">Amount of ?principal loan.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_mta_PrincipalAmountOfLoan_1" xml:lang="en-US">Principal amount of loan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PrincipalAmountOfLoan_2" xml:lang="en-US">Principal Amount Of Loan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PrivatePlacementsMember_0" xml:lang="en-US">Private Placements Member</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_PrivatePlacementsMember_1" xml:lang="en-US">Private Placements [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProceedsFromAtMarketNetOfShareIssueCosts_0" xml:lang="en-US">Represents the amount of Proceeds from At Market, net share issue costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProceedsFromAtMarketNetOfShareIssueCosts_1" xml:lang="en-US">Proceeds From At Market Net Of Share Issue Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ProceedsFromAtMarketNetOfShareIssueCosts_2" xml:lang="en-US">Proceeds from ATM, net of share issue costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProceedsFromBeedieSubscription_0" xml:lang="en-US">The amount represents for proceeds from beedie subscription.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProceedsFromBeedieSubscription_1" xml:lang="en-US">Proceeds From Beedie Subscription</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ProceedsFromBeedieSubscription_2" xml:lang="en-US">Proceeds from Beedie subscription</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProceedsFromExerciseOfSharePurchaseWarrants_0" xml:lang="en-US">The cash inflow from the exercise of share purchase warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProceedsFromExerciseOfSharePurchaseWarrants_1" xml:lang="en-US">Proceeds From Exercise Of Share Purchase Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ProceedsFromExerciseOfSharePurchaseWarrants_2" xml:lang="en-US">Proceeds from exercise of share purchase warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProceedsFromPrivatePlacement_0" xml:lang="en-US">Represents the amount of proceeds from private placement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProceedsFromPrivatePlacement_1" xml:lang="en-US">Proceeds From Private Placement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ProceedsFromPrivatePlacement_2" xml:lang="en-US">Proceeds from private placement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProceedsFromSaleOfMineralClaims_0" xml:lang="en-US">The amount represents for proceeds from sale of mineral claims.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProceedsFromSaleOfMineralClaims_1" xml:lang="en-US">Proceeds From Sale Of Mineral Claims</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ProceedsFromSaleOfMineralClaims_2" xml:lang="en-US">Sale of mineral claims</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProceedsFromSaleOfProject_0" xml:lang="en-US">Represents the amount of proceeds from sale or project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProceedsFromSaleOfProject_1" xml:lang="en-US">Proceeds From Sale Of Project</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ProceedsFromSaleOfProject_2" xml:lang="en-US">Proceeds from sale of project</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ProducingAssetsMember_0" xml:lang="en-US">Producing Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ProducingAssetsMember_1" xml:lang="en-US">Producing Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ProducingAssetsMember_2" xml:lang="en-US">Producing Assets [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PropertyAxis_0" xml:lang="en-US">Represents the different properties.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PropertyAxis_1" xml:lang="en-US">Property [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PropertyDomain_0" xml:lang="en-US">Represents the different properties.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PropertyDomain_1" xml:lang="en-US">Property [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PuchuldizaProjectMember_0" xml:lang="en-US">Puchuldiza project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PuchuldizaProjectMember_1" xml:lang="en-US">Puchuldiza Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PuchuldizaProjectMember_2" xml:lang="en-US">Puchuldiza project</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PurchaseAndSaleAgreementMember_0" xml:lang="en-US">This member stand for purchase and sale agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PurchaseAndSaleAgreementMember_1" xml:lang="en-US">Purchase And Sale Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PurchaseAndSaleAgreementMember_2" xml:lang="en-US">Purchase and sale agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PurchasePriceForAdditionalNetSmelterRoyalty_0" xml:lang="en-US">Purchase price for additional net smelter royalty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PurchasePriceForAdditionalNetSmelterRoyalty_1" xml:lang="en-US">Purchase Price For Additional Net Smelter Royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PurchasePriceForAdditionalNetSmelterRoyalty_2" xml:lang="en-US">Purchase price for additional net smelter royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PurchasePriceOfAcquisitionPaidInCash_0" xml:lang="en-US">It represents purchase price of acquisition paid in cash.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PurchasePriceOfAcquisitionPaidInCash_1" xml:lang="en-US">Purchase price of acquisition paid in cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PurchasePriceOfAcquisitionPaidInCash_2" xml:lang="en-US">Purchase price of acquisition paid in cash</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PurchasePriceOfAgreement_0" xml:lang="en-US">Represents amount of purchase price of agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PurchasePriceOfAgreement_1" xml:lang="en-US">Purchase Price Of Agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PurchasePriceOfAgreement_2" xml:lang="en-US">Purchase price of agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_PurchasePriceOfAgreementPayableInShares_0" xml:lang="en-US">Represents purchase price of agreement payable in share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_PurchasePriceOfAgreementPayableInShares_1" xml:lang="en-US">Purchase Price Of Agreement Payable In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_PurchasePriceOfAgreementPayableInShares_2" xml:lang="en-US">Purchase price of agreement payable in shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ReallocationFromReservesForRestrictedShareUnitsSettled_0" xml:lang="en-US">The amount of reallocation from reserves for restricted share units settled.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ReallocationFromReservesForRestrictedShareUnitsSettled_1" xml:lang="en-US">Reallocation From Reserves For Restricted Share Units Settled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ReallocationFromReservesForRestrictedShareUnitsSettled_2" xml:lang="en-US">Reallocation from reserves for RSU settled</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ReallocationFromReservesForSharePurchaseWarrantsExercised_0" xml:lang="en-US">The amount of reallocation from reserves for share purchase warrants exercised.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_ReallocationFromReservesForSharePurchaseWarrantsExercised_1" xml:lang="en-US">Reallocation from reserves for share purchase warrants exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ReallocationFromReservesForSharePurchaseWarrantsExercised_2" xml:lang="en-US">Reallocation From Reserves For Share Purchase Warrants Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ReallocationFromReservesForSharePurchaseWarrantsExercised_3" xml:lang="en-US">Reallocation from reserves for share purchase warrants exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ReallocationFromReservesForStockOptionsExercised_0" xml:lang="en-US">The amount of reallocation from reserves for stock options exercised.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_ReallocationFromReservesForStockOptionsExercised_1" xml:lang="en-US">Reallocation from reserves for stock options exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ReallocationFromReservesForStockOptionsExercised_2" xml:lang="en-US">Reallocation From Reserves For Stock Options Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ReallocationFromReservesForStockOptionsExercised_3" xml:lang="en-US">Reallocation from reserves for stock options exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition_0" xml:lang="en-US">The amount of reallocation of deferred acquisition costs to royalty and stream interests on closing of acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition_1" xml:lang="en-US">Reallocation Of Deferred Acquisition Costs To Royalty And Stream Interests On Closing Of Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition_2" xml:lang="en-US">Reallocation of deferred acquisition costs to royalty and stream interests on closing of acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_Reclassification_0" xml:lang="en-US">Represent the reclassification .</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_Reclassification_1" xml:lang="en-US">Reclassification</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RecoverableAmountOfMineralReservesAndResources_0" xml:lang="en-US">Recoveries of Royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RecoverableAmountOfMineralReservesAndResources_1" xml:lang="en-US">Recoverable Amount Of Mineral Reserves And Resources</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RecoveriesFromRoyaltyAndStreamInterests_0" xml:lang="en-US">Recoveries from royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RecoveriesFromRoyaltyAndStreamInterests_1" xml:lang="en-US">Recoveries From Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RecoveriesFromRoyaltyAndStreamInterests_2" xml:lang="en-US">Recoveries from royalty and stream interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RecoveriesOfRoyaltyAndStreamInterests_0" xml:lang="en-US">Recoveries of Royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_RecoveriesOfRoyaltyAndStreamInterests_1" xml:lang="en-US">Recoveries</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RecoveriesOfRoyaltyAndStreamInterests_2" xml:lang="en-US">Recoveries Of Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RecoveriesOfRoyaltyAndStreamInterests_3" xml:lang="en-US">Recoverable amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RecoveriesOfRoyaltyAndStreamInterests_4" xml:lang="en-US">Recoveries</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RedHillMember_0" xml:lang="en-US">Red Hill [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RedHillMember_1" xml:lang="en-US">Red Hill [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RemainingAmountOfPurchasePriceOfAcquisition_0" xml:lang="en-US">It represents remaining amount of purchase price of acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RemainingAmountOfPurchasePriceOfAcquisition_1" xml:lang="en-US">Remaining Amount Of Purchase Price Of Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RemainingAmountOfPurchasePriceOfAcquisition_2" xml:lang="en-US">Remaining amount of purchase price of acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RemainingAmountPayableSixtyDaysAfterClosing_0" xml:lang="en-US">Represents the remaining amount payable sixty days after closing in business combination.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RemainingAmountPayableSixtyDaysAfterClosing_1" xml:lang="en-US">Remaining Amount Payable Sixty Days After Closing</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RemainingAmountPayableSixtyDaysAfterClosing_2" xml:lang="en-US">Remaining amount payable 60 days after closing</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RepaymentOfThirdPartyLoans_0" xml:lang="en-US">Represents amount of third party loans.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RepaymentOfThirdPartyLoans_1" xml:lang="en-US">Repayment Of Third Party Loans</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RepaymentOfThirdPartyLoans_2" xml:lang="en-US">Repayment third party loans</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RepaymentsOfFinanceChargesPaid_0" xml:lang="en-US">Represents amount related to finance charges paid.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_RepaymentsOfFinanceChargesPaid_1" xml:lang="en-US">Finance charges paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RepaymentsOfFinanceChargesPaid_2" xml:lang="en-US">Repayments Of Finance Charges Paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ReserveForSharePurchaseWarrants_0" xml:lang="en-US">Reserve For Share Purchase Warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ReserveForSharePurchaseWarrants_1" xml:lang="en-US">Reserve For Share Purchase Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ReserveForSharePurchaseWarrants_2" xml:lang="en-US">Reserve for ValGold share purchase warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RestrictedStockUnitIssuedToDirectorsAndOfficers_0" xml:lang="en-US">Number of RSUs directors and officers.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RestrictedStockUnitIssuedToDirectorsAndOfficers_1" xml:lang="en-US">Restricted Stock Unit Issued To Directors And Officers</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RestrictedStockUnitIssuedToDirectorsAndOfficers_2" xml:lang="en-US">Share-based payments - restricted share units (shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RestrictedStockUnitIssuedToDirectorsAndOfficers_3" xml:lang="en-US">Restricted stock unit issued to directors and officers</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ResultOfIndependentMineralResourceEstimationReport_0" xml:lang="en-US">Information of result of Independent Mineral Resource Estimation report.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ResultOfIndependentMineralResourceEstimationReport_1" xml:lang="en-US">Result Of Independent Mineral Resource Estimation Report</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ResultOfIndependentMineralResourceEstimationReport_2" xml:lang="en-US">Result of Independent Mineral Resource Estimation report</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevenueFromOtherFixedRoyaltyPayments_0" xml:lang="en-US">Revenue from other fixed royalty payments.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevenueFromOtherFixedRoyaltyPayments_1" xml:lang="en-US">Revenue From Other Fixed Royalty Payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RevenueFromOtherFixedRoyaltyPayments_2" xml:lang="en-US">Other fixed royalty payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevenueFromRoyaltyInterests_0" xml:lang="en-US">Amount of revenue from royalty interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevenueFromRoyaltyInterests_1" xml:lang="en-US">Revenue From Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevenueFromRoyaltyInterests_2" xml:lang="en-US">Revenue from royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevenueFromStreamInterest_0" xml:lang="en-US">Revenue from stream interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveTerseLabel" xlink:label="lab_mta_RevenueFromStreamInterest_1" xml:lang="en-US">Stream revenue - Endeavor</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevenueFromStreamInterest_2" xml:lang="en-US">Revenue From Stream Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevenueFromStreamInterest_3" xml:lang="en-US">Revenue from stream interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RevenueFromStreamInterest_4" xml:lang="en-US">Revenue from stream interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevenueLineItems_0" xml:lang="en-US">Revenue [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevenueTable_0" xml:lang="en-US">Revenue [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevisedConversionPrice_0" xml:lang="en-US">Represents revised conversion price per share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevisedConversionPrice_1" xml:lang="en-US">Revised Conversion Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevisedConversionPrice_2" xml:lang="en-US">Revised conversion price per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevolvingCreditFacility_0" xml:lang="en-US">Represents amount of revolving credit facility.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevolvingCreditFacility_1" xml:lang="en-US">Revolving Credit Facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevolvingCreditFacility_2" xml:lang="en-US">Revolving credit facility</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevolvingCreditFacilityAccordionFeature_0" xml:lang="en-US">Represents revolving credit facility accordion feature.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevolvingCreditFacilityAccordionFeature_1" xml:lang="en-US">Revolving Credit Facility Accordion Feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevolvingCreditFacilityAccordionFeature_2" xml:lang="en-US">Revolving credit facility accordion feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RevolvingCreditFacilityAndAccordionFeature_0" xml:lang="en-US">Represents amount of revolving credit facility and accordion feature.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevolvingCreditFacilityAndAccordionFeature_1" xml:lang="en-US">Revolving Credit Facility And Accordion Feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevolvingCreditFacilityAndAccordionFeature_2" xml:lang="en-US">Revolving credit facility and accordion feature</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RevolvingCreditsFacilityMember_0" xml:lang="en-US">Revolving Credits Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RevolvingCreditsFacilityMember_1" xml:lang="en-US">Revolving Credit Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RightOfFirstRefusal_0" xml:lang="en-US">The amount of right of first refusal.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RightOfFirstRefusal_1" xml:lang="en-US">Right Of First Refusal</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RightOfFirstRefusal_2" xml:lang="en-US">Right of first refusal</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RightOfFirstRefusalOnNetSmelterReturn_0" xml:lang="en-US">Right Of First Refusal On Net Smelter Return</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RightOfFirstRefusalOnNetSmelterReturn_1" xml:lang="en-US">Right of first refusal on NSR royalty</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RightToBuyBackStreamAmount_0" xml:lang="en-US">Right to buy-back stream amount.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RightToBuyBackStreamAmount_1" xml:lang="en-US">Right To Buy Back Stream Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RightToBuyBackStreamAmount_2" xml:lang="en-US">Right to buy-back stream, amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RightToBuySilverProduction_0" xml:lang="en-US">Right to buy silver production.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RightToBuySilverProduction_1" xml:lang="en-US">Right To Buy Silver Production</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RightToBuySilverProduction_2" xml:lang="en-US">Right to buy silver production</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RightToDeliverSilverProductionOuncesDelivered_0" xml:lang="en-US">Right to deliver silver production, ounces delivered.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RightToDeliverSilverProductionOuncesDelivered_1" xml:lang="en-US">Right To Deliver Silver Production Ounces Delivered</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RightToDeliverSilverProductionOuncesDelivered_2" xml:lang="en-US">Right to deliver silver production, ounces delivered</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RightToDeliverSilverProductionOuncesRemainingToBeDelivered_0" xml:lang="en-US">Right to deliver silver production, ounces remaining to be delivered.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RightToDeliverSilverProductionOuncesRemainingToBeDelivered_1" xml:lang="en-US">Right To Deliver Silver Production Ounces Remaining To Be Delivered</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RightToDeliverSilverProductionOuncesRemainingToBeDelivered_2" xml:lang="en-US">Right to deliver silver production, ounces remaining to be delivered</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RiskFreeInterestRate_0" xml:lang="en-US">The percentage of risk free interest rate.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RiskFreeInterestRate_1" xml:lang="en-US">Risk Free Interest Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RiskFreeInterestRate_2" xml:lang="en-US">Risk free interest rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RiskFreeInterestRateWarrantsGranted_0" xml:lang="en-US">Represents the risk free interest rate of warrants granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RiskFreeInterestRateWarrantsGranted_1" xml:lang="en-US">Risk Free Interest Rate Warrants Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RiskFreeInterestRateWarrantsGranted_2" xml:lang="en-US">Risk free interest rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RondaProjectMember_0" xml:lang="en-US">This member stands for Ronda project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RondaProjectMember_1" xml:lang="en-US">Ronda Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RoyaltyAndStreamInterests_0" xml:lang="en-US">The carrying amount of royalty and stream interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_mta_RoyaltyAndStreamInterests_1" xml:lang="en-US">Ending balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_mta_RoyaltyAndStreamInterests_2" xml:lang="en-US">Beginning balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RoyaltyAndStreamInterests_3" xml:lang="en-US">Royalty And Stream Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RoyaltyAndStreamInterests_4" xml:lang="en-US">Royalty, stream, and other interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RoyaltyInterestImpairment_0" xml:lang="en-US">The amount represents for royalty interest impairment.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_RoyaltyInterestImpairment_1" xml:lang="en-US">Royalty interest impairment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RoyaltyInterestImpairment_2" xml:lang="en-US">Royalty interest impairment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RoyaltyInterestImpairment_3" xml:lang="en-US">Impairment charge</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCosts_0" xml:lang="en-US">Royalty Interests And Deferred Acquisition Costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCosts_1" xml:lang="en-US">Royalty Interests And Deferred Acquisition Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCosts_2" xml:lang="en-US">ValGold royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCosts_3" xml:lang="en-US">Royalty interests and deferred acquisition costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract_0" xml:lang="en-US">Royalty Interests and Deferred Acquisition Costs [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract_1" xml:lang="en-US">Accounts payable and accrued liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract_2" xml:lang="en-US">Royalty Interests and Deferred Acquisition Costs [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SaleOfAcquisitionToOriginalOwner_0" xml:lang="en-US">It represents sale of acquisition to original owner.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SaleOfAcquisitionToOriginalOwner_1" xml:lang="en-US">Sale Of Acquisition To Original Owner</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SaleOfAcquisitionToOriginalOwner_2" xml:lang="en-US">Sale of acquisition to original owner</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SanMartinMineMember_0" xml:lang="en-US">San Martin Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SanMartinMineMember_1" xml:lang="en-US">San Martin Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SantaGertrudisAcquisitionsMember_0" xml:lang="en-US">Santa Gertrudis acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SantaGertrudisAcquisitionsMember_1" xml:lang="en-US">Santa Gertrudis Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SantaGertrudisAcquisitionsMember_2" xml:lang="en-US">Santa Gertrudis acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SantaGertrudisAcquisitonsMember_0" xml:lang="en-US">Santa Gertrudis acquisitons.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SantaGertrudisAcquisitonsMember_1" xml:lang="en-US">Santa Gertrudis Acquisitons [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SantaGertrudisAcquisitonsMember_2" xml:lang="en-US">Santa Gertrudis acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ScheduleOfDetailedInformationAboutTradeAndOthersPayableAbstract_0" xml:lang="en-US">Schedule Of Detailed Information About Trade And Others Payable [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ScheduleOfWarrantLineItems_0" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ScheduleOfWarrantLineItems_1" xml:lang="en-US">Schedule Of Warrant [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ScheduleOfWarrantTable_0" xml:lang="en-US">Schedule disclosing information related to warrant.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ScheduleOfWarrantTable_1" xml:lang="en-US">Schedule Of Warrant [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SecondAmendmentMember_0" xml:lang="en-US">Second Amendment  [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SecondAmendmentMember_1" xml:lang="en-US">Second Amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SecondAmendmentMember_2" xml:lang="en-US">Second Amendment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SecondDrawdownMember_0" xml:lang="en-US">Second Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SecondDrawdownMember_1" xml:lang="en-US">Second Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SecondExpiryDateDecember12024Member_0" xml:lang="en-US">Second Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SecondExpiryDateDecember12024Member_1" xml:lang="en-US">Second Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_SecondExpiryDateDecember12024Member_2" xml:lang="en-US">December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SecuredLoanAgreementsAggregateAmount_0" xml:lang="en-US">Represents secured aggregate loan amount.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SecuredLoanAgreementsAggregateAmount_1" xml:lang="en-US">Secured Loan Agreements Aggregate Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SecuredLoanAgreementsAggregateAmount_2" xml:lang="en-US">Secured loan agreements aggregate amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SensitivityAnalysisVariancePrice_0" xml:lang="en-US">Sensitivity analysis, variance, percentage.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SensitivityAnalysisVariancePrice_1" xml:lang="en-US">Sensitivity Analysis Variance Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_SensitivityAnalysisVariancePrice_2" xml:lang="en-US">Sensitivity analysis, variance, percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ShareExchangeRatio_0" xml:lang="en-US">Share exchange ratio</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ShareIssueCostsMember_0" xml:lang="en-US">This member stands for share issue costs.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ShareIssueCostsMember_1" xml:lang="en-US">Share Issue Costs [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ShareIssueCostsMember_2" xml:lang="en-US">Share issue costs [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ShareOptionForfeitureRate_0" xml:lang="en-US">The percentage of forfeiture rate.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ShareOptionForfeitureRate_1" xml:lang="en-US">Share Option Forfeiture Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ShareOptionForfeitureRate_2" xml:lang="en-US">Forfeiture rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SharePricePerShare_0" xml:lang="en-US">Share price per share.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SharePricePerShare_1" xml:lang="en-US">Share Price Per Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_SharePricePerShare_2" xml:lang="en-US">Closing price of a Metalla Share on November 30, 2023, on TSXV</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SharePricePerShare_3" xml:lang="en-US">Share price per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SharePrices_0" xml:lang="en-US">Represents the share prices.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SharePrices_1" xml:lang="en-US">Share Prices</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_SharePrices_2" xml:lang="en-US">Share price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SharePurchaseWarrantExercisePriceTerm_0" xml:lang="en-US">Term of share purchase warrant exercise price.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SharePurchaseWarrantExercisePriceTerm_1" xml:lang="en-US">Share Purchase Warrant Exercise Price Term</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SharePurchaseWarrantExercisePriceTerm_2" xml:lang="en-US">Term of share purchase warrant exercise price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SharePurchaseWarrantOutstandingExercisableAcquisition_0" xml:lang="en-US">It reprensets share purchase warrant outstanding exercisable acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SharePurchaseWarrantOutstandingExercisableAcquisition_1" xml:lang="en-US">Share Purchase Warrant Outstanding Exercisable Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SharePurchaseWarrantOutstandingExercisableAcquisition_2" xml:lang="en-US">Share purchase warrant outstanding exercisable acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SharePurchaseWarrantsIssued_0" xml:lang="en-US">Share purchase warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SharePurchaseWarrantsIssued_1" xml:lang="en-US">Share Purchase Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SharePurchaseWarrantsIssued_2" xml:lang="en-US">Share purchase warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SharesIssuedUponConversionOfDebt_0" xml:lang="en-US">Represents the number of shares issued upon conversion of debt.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SharesIssuedUponConversionOfDebt_1" xml:lang="en-US">Shares Issued Upon Conversion Of Debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SharesIssuedUponConversionOfDebt_2" xml:lang="en-US">Common shares issued upon conversion of loan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SierraMadreGoldAndSilverLtdMember_0" xml:lang="en-US">This member stands for Sierra Madre Gold and Silver Ltd.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SierraMadreGoldAndSilverLtdMember_1" xml:lang="en-US">Sierra Madre Gold And Silver Ltd [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_SierraMadreGoldAndSilverLtdMember_2" xml:lang="en-US">Sierra Madre Gold and Silver Ltd [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SilverDollarResourcesMember_0" xml:lang="en-US">This member stands for Silver Dollar Resources.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SilverDollarResourcesMember_1" xml:lang="en-US">Silver Dollar Resources [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SilverStormMiningLtdMember_0" xml:lang="en-US">Silver Storm Mining Ltd [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_StandbyFeeOnUndrawnPortion_0" xml:lang="en-US">Standby fee on undrawn portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_StandbyFeeOnUndrawnPortion_1" xml:lang="en-US">Standby Fee On Undrawn Portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_StandbyFeeOnUndrawnPortion_2" xml:lang="en-US">Standby fee on undrawn portion</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_StockOptionsExercisedOnNetExerciseBasis_0" xml:lang="en-US">The number of stock options which were exercised on a net exercise basis.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_StockOptionsExercisedOnNetExerciseBasis_1" xml:lang="en-US">Stock Options Exercised On Net Exercise Basis</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_StockOptionsExercisedOnNetExerciseBasis_2" xml:lang="en-US">Stock options exercised on a net exercise basis</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_StockOptionsPlanExpense_0" xml:lang="en-US">Represents amount of stock options plan expense.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_mta_StockOptionsPlanExpense_1" xml:lang="en-US">Share-based payments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_StockOptionsPlanExpense_2" xml:lang="en-US">Stock Options Plan Expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_StockOptionsPlanExpense_3" xml:lang="en-US">Stock options plan expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SubscriptionAgreementMember_0" xml:lang="en-US">This member stands for subscription agreement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SubscriptionAgreementMember_1" xml:lang="en-US">Subscription Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowAbstract_0" xml:lang="en-US">Supplemental Disclosure Of Cash Flow [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowAbstract_1" xml:lang="en-US">Aggregate value of private placement units issued on settlement of loans payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowLineItems_0" xml:lang="en-US">Represents supplemental disclosure of cash flow line item.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowLineItems_1" xml:lang="en-US">Supplemental Disclosure Of Cash Flow [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowLineItems_2" xml:lang="en-US">Supplemental disclosure of cash flow [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowTable_0" xml:lang="en-US">Represents supplemental disclosure of cash flow table.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SupplementalDisclosureOfCashFlowTable_1" xml:lang="en-US">Supplemental Disclosure Of Cash Flow [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SupplementalLoanAgreementAxis_0" xml:lang="en-US">supplemental loan agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SupplementalLoanAgreementAxis_1" xml:lang="en-US">Supplemental Loan Agreement [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_SupplementalLoanAgreementDomain_0" xml:lang="en-US">supplemental loan agreement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_SupplementalLoanAgreementDomain_1" xml:lang="en-US">Supplemental Loan Agreement [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TacaTacaMember_0" xml:lang="en-US">This member stands for Taca Taca.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TacaTacaMember_1" xml:lang="en-US">Taca Taca [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TacaTacaMember_2" xml:lang="en-US">Taca Taca [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets_0" xml:lang="en-US">Amount of tax effect of changes in unrecognized deferred tax assets.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets_1" xml:lang="en-US">Tax Effect Of Changes In Unrecognized Deferred Tax Assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets_2" xml:lang="en-US">Changes in unrecognized deferred tax assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TermOfConvertibleDebenturePayable_0" xml:lang="en-US">Represent the term of convertible debenture payable.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TermOfConvertibleDebenturePayable_1" xml:lang="en-US">Term Of Convertible Debenture Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_TermOfConvertibleDebenturePayable_2" xml:lang="en-US">Term of convertible debenture payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TermOfConvertibleDebenturePayable_3" xml:lang="en-US">Terms of loan aggregate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TermOfExerciseOfOption_0" xml:lang="en-US">Represents the term of excerise of option.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TermOfExerciseOfOption_1" xml:lang="en-US">Term Of Exercise Of Option</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TermOfExerciseOfOption_2" xml:lang="en-US">Term of exercise of option</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TermOfWarrants_0" xml:lang="en-US">Represents term of warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TermOfWarrants_1" xml:lang="en-US">Term Of Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TermOfWarrants_2" xml:lang="en-US">Term of warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ThereafterYearMember_0" xml:lang="en-US">This member stands for thereafter year information.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ThereafterYearMember_1" xml:lang="en-US">Thereafter Year [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ThereafterYearMember_2" xml:lang="en-US">Thereafter [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ThirdDrawdownMember_0" xml:lang="en-US">Third Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ThirdDrawdownMember_1" xml:lang="en-US">Third Drawdown [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ThirdExpiryDateDecember12024Member_0" xml:lang="en-US">Third Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ThirdExpiryDateDecember12024Member_1" xml:lang="en-US">Third Expiry Date December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ThirdExpiryDateDecember12024Member_2" xml:lang="en-US">December 1, 2024 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ThirtyDaysVolumeWeightedAveragePriceMember_0" xml:lang="en-US">Thirty Days Volume Weighted Average Price [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ThirtyDaysVolumeWeightedAveragePriceMember_1" xml:lang="en-US">Thirty Days Volume Weighted Average Price [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ThirtyDaysVolumeWeightedAveragePriceMember_2" xml:lang="en-US">30-day VWAP [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TocantinzinhoAcquisitionMember_0" xml:lang="en-US">Tocantinzinho Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TocantinzinhoAcquisitionMember_1" xml:lang="en-US">Tocantinzinho Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_TocantinzinhoAcquisitionMember_2" xml:lang="en-US">Tocantinzinho [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TocantinzinhoAcquisitionMember_3" xml:lang="en-US">Tocantinzinho acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TotalGrossProceedsFromAtMarketProgram_0" xml:lang="en-US">Total gross proceeds from ATM program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TotalGrossProceedsFromAtMarketProgram_1" xml:lang="en-US">Total Gross Proceeds From At Market Program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TotalGrossProceedsFromAtMarketProgram_2" xml:lang="en-US">Total gross proceeds from ATM program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TotalNsrRoyaltyInterestHeld_0" xml:lang="en-US">The total percentage ownership in NSR royalty held.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TotalNsrRoyaltyInterestHeld_1" xml:lang="en-US">Total Nsr Royalty Interest Held</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_TotalNsrRoyaltyInterestHeld_2" xml:lang="en-US">C&#244;t&#233;-Gosselin NSR, total ownership</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TotalNumberOfSharesIssuanceOfAcquisitionDate_0" xml:lang="en-US">It represents total number of shares issuance of acquisition date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TotalNumberOfSharesIssuanceOfAcquisitionDate_1" xml:lang="en-US">Total Number Of Shares Issuance Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TotalNumberOfSharesIssuanceOfAcquisitionDate_2" xml:lang="en-US">Total Number of Metalla Shares issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TotalSharesDistributedInAtMarketProgram_0" xml:lang="en-US">Total shares distributed in ATM program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TotalSharesDistributedInAtMarketProgram_1" xml:lang="en-US">Total Shares Distributed In At Market Program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TotalSharesDistributedInAtMarketProgram_2" xml:lang="en-US">Total shares distributed in ATM program</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TowerMountainProjectMember_0" xml:lang="en-US">Tower Mountain project.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TowerMountainProjectMember_1" xml:lang="en-US">Tower Mountain Project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TowerMountainProjectMember_2" xml:lang="en-US">Tower Mountain project [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TradeAndOtherPayablesMember_0" xml:lang="en-US">Represents trade and other payables member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TradeAndOtherPayablesMember_1" xml:lang="en-US">Trade And Other Payables [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TradeAndOtherPayablesMember_2" xml:lang="en-US">Trade and other payables [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TransactionCostOnAcquisition_0" xml:lang="en-US">Represents acquisition costs on acquisition during the period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TransactionCostOnAcquisition_1" xml:lang="en-US">Transaction Cost On Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_TransactionCostOnAcquisition_2" xml:lang="en-US">Transaction costs on acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TransactionCosts_0" xml:lang="en-US">Transaction Costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_TransactionCosts_1" xml:lang="en-US">Transaction costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TransactionCostsOfAcquisitionDate_0" xml:lang="en-US">It represents transaction costs of acquisition date.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TransactionCostsOfAcquisitionDate_1" xml:lang="en-US">Transaction Costs Of Acquisition Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_TransactionCostsOfAcquisitionDate_2" xml:lang="en-US">Transaction costs</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TwoYearMemberMember_0" xml:lang="en-US">This member represents information about two year.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TwoYearMemberMember_1" xml:lang="en-US">Two Year Member [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_TwoYearMemberMember_2" xml:lang="en-US">Second year [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TypeOfArrangementsAxis_0" xml:lang="en-US">Information by category of arrangement, including but not limited to collaborative arrangements and non-collaborative arrangements.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TypeOfArrangementsAxis_1" xml:lang="en-US">Type Of Arrangements [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_TypeOfArrangementsDomain_0" xml:lang="en-US">This item is to be populated with the collective of (i) types (categories) of arrangements of the entity applicable to its revenue-generating activities or operations and non-arrangement transactions, including but not limited to, for instance, sales of product manufactured by the entity, if such comparison of arrangements as a component of all transactions is provided by the entity.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_TypeOfArrangementsDomain_1" xml:lang="en-US">Type Of Arrangements [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_UnamortizedFairValueAdjustmentOfUnderlyingSilverStreamAsset_0" xml:lang="en-US">Unamortized fair value adjustment of underlying silver stream asset.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_UnamortizedFairValueAdjustmentOfUnderlyingSilverStreamAsset_1" xml:lang="en-US">Unamortized Fair Value Adjustment Of Underlying Silver Stream Asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_UnamortizedFairValueAdjustmentOfUnderlyingSilverStreamAsset_2" xml:lang="en-US">Unamortized fair value adjustment of underlying silver stream asset</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_UnitsIssuedInPeriod_0" xml:lang="en-US">Units issued in period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_UnitsIssuedInPeriod_1" xml:lang="en-US">Units Issued In Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_UnitsIssuedInPeriod_2" xml:lang="en-US">Units issued in period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_UnitsIssuedInPeriodPricePerUnit_0" xml:lang="en-US">Represents price per unit issued in period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_UnitsIssuedInPeriodPricePerUnit_1" xml:lang="en-US">Units Issued In Period Price Per Unit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_UnitsIssuedInPeriodPricePerUnit_2" xml:lang="en-US">Units issued in period price per unit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_UpfrontPaymentMadeUponExerciseOfOption_0" xml:lang="en-US">The amount of upfront payment made upon exercise of option.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_UpfrontPaymentMadeUponExerciseOfOption_1" xml:lang="en-US">Upfront Payment Made Upon Exercise Of Option</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_UpfrontPaymentMadeUponExerciseOfOption_2" xml:lang="en-US">Upfront payment made upon exercise of option</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValgoldAcquisitionsMember_0" xml:lang="en-US">ValGold acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValgoldAcquisitionsMember_1" xml:lang="en-US">Valgold Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ValgoldAcquisitionsMember_2" xml:lang="en-US">ValGold acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValgoldAcquisitionsMember_3" xml:lang="en-US">ValGold acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfCommonSharesAcquisition_0" xml:lang="en-US">Represents amount related to acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfCommonSharesAcquisition_1" xml:lang="en-US">Value Of Common Shares Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfCommonSharesAcquisition_2" xml:lang="en-US">Value of common shares acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers_0" xml:lang="en-US">Value of restricted stock unit issued to directors and officers.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_mta_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers_1" xml:lang="en-US">Share-based payments - restricted share units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers_2" xml:lang="en-US">Value Of Restricted Stock Unit Issued To Directors And Officers</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers_3" xml:lang="en-US">Restricted share units vested</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers_4" xml:lang="en-US">Value of restricted stock unit issued to directors and officers</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfShareOptionsConvertedToShareOptions_0" xml:lang="en-US">It represents value of share options converted to share options.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfShareOptionsConvertedToShareOptions_1" xml:lang="en-US">Value Of Share Options Converted To Share Options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfShareOptionsConvertedToShareOptions_2" xml:lang="en-US">Value of Nova share options converted to Metalla share options</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfSharePurchaseWarrantsIssued_0" xml:lang="en-US">Value of share purchase warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfSharePurchaseWarrantsIssued_1" xml:lang="en-US">Value Of Share Purchase Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_ValueOfSharePurchaseWarrantsIssued_2" xml:lang="en-US">Fair value at measurement date, warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfSharePurchaseWarrantsIssued_3" xml:lang="en-US">Value of share purchase warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfSharesIssuedForVestingOfRestrictedStockUnits_0" xml:lang="en-US">Value of shares issued for vesting of restricted stock units.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfSharesIssuedForVestingOfRestrictedStockUnits_1" xml:lang="en-US">Value Of Shares Issued For Vesting Of Restricted Stock Units.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfSharesIssuedForVestingOfRestrictedStockUnits_2" xml:lang="en-US">Value of common shares issued for vesting of RSU</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfUnderwritersWarrantsIssued_0" xml:lang="en-US">The value of underwriter's warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfUnderwritersWarrantsIssued_1" xml:lang="en-US">Value Of Underwriters Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfUnderwritersWarrantsIssued_2" xml:lang="en-US">Value of underwriter's warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfUnderwriterWarrantsIssued_0" xml:lang="en-US">Represents value of underwriter warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfUnderwriterWarrantsIssued_1" xml:lang="en-US">Value Of Underwriter Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfUnderwriterWarrantsIssued_2" xml:lang="en-US">Value of underwriter warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfUnitsIssuedInPeriod_0" xml:lang="en-US">Represents value of units issued in period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfUnitsIssuedInPeriod_1" xml:lang="en-US">Value Of Units Issued In Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfUnitsIssuedInPeriod_2" xml:lang="en-US">Value of units issued in period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfWarrantsIssued_0" xml:lang="en-US">Represents value of warrant issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfWarrantsIssued_1" xml:lang="en-US">Value Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfWarrantsIssued_2" xml:lang="en-US">Value of warrants issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ValueOfWarrantsIssuedForAcquisitionsOfRoyaltyInterests_0" xml:lang="en-US">It represents value of warrants issued for acquisitions of Royalty Interests.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ValueOfWarrantsIssuedForAcquisitionsOfRoyaltyInterests_1" xml:lang="en-US">Value Of Warrants Issued For Acquisitions Of Royalty Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ValueOfWarrantsIssuedForAcquisitionsOfRoyaltyInterests_2" xml:lang="en-US">Value of warrants issued for acquisitions of royalty interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_VizcachitasMember_0" xml:lang="en-US">This member stands for Vizcachitas.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_VizcachitasMember_1" xml:lang="en-US">Vizcachitas [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_VizcachitasMember_2" xml:lang="en-US">Vizcachitas [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_VolumeWeightedAveragePriceAxis_0" xml:lang="en-US">Volume Weighted Average Price [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_VolumeWeightedAveragePriceDomain_0" xml:lang="en-US">Volume Weighted Average Price [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WarrantsExercisePrice_0" xml:lang="en-US">It represents as a exercise price of warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WarrantsExercisePrice_1" xml:lang="en-US">Warrants Exercise Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WarrantsExercisePrice_2" xml:lang="en-US">Warrants exercise price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WarrantsForfeitureRate_0" xml:lang="en-US">The forfeiture rate of warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WarrantsForfeitureRate_1" xml:lang="en-US">Warrants Forfeiture Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WarrantsForfeitureRate_2" xml:lang="en-US">Forfeiture rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WasamacNsrMember_0" xml:lang="en-US">Wasamac NSR.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WasamacNsrMember_1" xml:lang="en-US">Wasamac Nsr [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_WasamacNsrMember_2" xml:lang="en-US">Wasamac</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WasamacNsrMember_3" xml:lang="en-US">Wasamac NSR</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageExercisePriceOfShareOptionsShareIssuedInShareBasedPaymentArrangement_0" xml:lang="en-US">Represent the Weighted average exercise price of share options share issued in share-based payment arrangement.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageExercisePriceOfShareOptionsShareIssuedInShareBasedPaymentArrangement_1" xml:lang="en-US">Weighted Average Exercise Price Of Share Options Share Issued In Share Based Payment Arrangement</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfShareOptionsShareIssuedInShareBasedPaymentArrangement_2" xml:lang="en-US">Weighted average exercise price, Issued as part of Nova Transaction</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued_0" xml:lang="en-US">It represents as a amount of underwriters warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued_1" xml:lang="en-US">Weighted Average Exercise Price Of Underwriters Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued_2" xml:lang="en-US">Weighted average exercise price of underwriter warrants, Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsExercised_0" xml:lang="en-US">It represents as a amount of warrants exercised.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsExercised_1" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsExercised_2" xml:lang="en-US">Weighted average exercise price of warrants, Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsExpired_0" xml:lang="en-US">It represents as a amount of warrants expired.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsExpired_1" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Expired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsExpired_2" xml:lang="en-US">Weighted average exercise price of warrants, Expired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsIssued_0" xml:lang="en-US">It represents as a amount of warrants issued.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsIssued_1" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsIssued_2" xml:lang="en-US">Weighted average exercise price of warrants, Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsOutstanding_0" xml:lang="en-US">Weighted average exercise price of warrants outstanding in share-based payment arrangement at beginning of period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsOutstanding_1" xml:lang="en-US">Weighted average exercise price of warrants outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsOutstanding_2" xml:lang="en-US">Weighted average exercise price of warrants outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageExercisePriceOfWarrantsOutstanding_3" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageFairValueOfRestrictedShareUnitsGranted_0" xml:lang="en-US">The weighted average fair value of other equity instruments granted.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageFairValueOfRestrictedShareUnitsGranted_1" xml:lang="en-US">Weighted Average Fair Value Of Restricted Share Units Granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WeightedAverageFairValueOfRestrictedShareUnitsGranted_2" xml:lang="en-US">Weighted average fair value of restricted share units granted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WeightedAverageFairValueOfWarrants_0" xml:lang="en-US">Represents the weighted average fair value of warrants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WeightedAverageFairValueOfWarrants_1" xml:lang="en-US">Weighted Average Fair Value Of Warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_WeightedAverageFairValueOfWarrants_2" xml:lang="en-US">Weighted average fair value of warrants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WestTimminsExtensionPropertiesMember_0" xml:lang="en-US">West Timmins extension properties.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WestTimminsExtensionPropertiesMember_1" xml:lang="en-US">West Timmins Extension Properties [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_WestTimminsExtensionPropertiesMember_2" xml:lang="en-US">West Timmins extension properties</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WharfAcquisitionMember_0" xml:lang="en-US">Wharf acquisition.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WharfAcquisitionMember_1" xml:lang="en-US">Wharf Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_WharfAcquisitionMember_2" xml:lang="en-US">Wharf acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WharfMember_0" xml:lang="en-US">Represents Wharf royalty member</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WharfMember_1" xml:lang="en-US">Wharf [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_WriteOffOfExplorationAndEvaluationAssets_0" xml:lang="en-US">Represent the write off of exploration and evaluation assets value.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_WriteOffOfExplorationAndEvaluationAssets_1" xml:lang="en-US">Write Off Of Exploration And Evaluation Assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_mta_WriteOffOfExplorationAndEvaluationAssets_2" xml:lang="en-US">Write off of exploration and evaluation assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ZacatecasSilverCorpMember_0" xml:lang="en-US">This member stands Zacatecas Silver Corp.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ZacatecasSilverCorpMember_1" xml:lang="en-US">Zacatecas Silver Corp [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mta_ZarumaGoldMineMember_0" xml:lang="en-US">Zaruma gold mine.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_mta_ZarumaGoldMineMember_1" xml:lang="en-US">Zaruma Gold Mine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_mta_ZarumaGoldMineMember_2" xml:lang="en-US">Zaruma gold mine</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_srt_ChiefFinancialOfficerMember_0" xml:lang="en-US">Chief Financial Officer [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_srt_ChiefFinancialOfficerMember_1" xml:lang="en-US">CFO [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_AR_1" xlink:to="lab_country_AR_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_AR_2" xlink:to="lab_country_AR_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_AU_3" xlink:to="lab_country_AU_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_AU_4" xlink:to="lab_country_AU_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_BR_5" xlink:to="lab_country_BR_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_BR_6" xlink:to="lab_country_BR_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CA_7" xlink:to="lab_country_CA_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CA_8" xlink:to="lab_country_CA_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CL_9" xlink:to="lab_country_CL_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CL_10" xlink:to="lab_country_CL_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_MX_11" xlink:to="lab_country_MX_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_MX_12" xlink:to="lab_country_MX_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_US_13" xlink:to="lab_country_US_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_US_14" xlink:to="lab_country_US_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_US_15" xlink:to="lab_country_US_2"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AddressTypeDomain_16" xlink:to="lab_dei_AddressTypeDomain_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentDescription_17" xlink:to="lab_dei_AmendmentDescription_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag_18" xlink:to="lab_dei_AmendmentFlag_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AnnualInformationForm_19" xlink:to="lab_dei_AnnualInformationForm_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditedAnnualFinancialStatements_20" xlink:to="lab_dei_AuditedAnnualFinancialStatements_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorFirmId_21" xlink:to="lab_dei_AuditorFirmId_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorLocation_22" xlink:to="lab_dei_AuditorLocation_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorName_23" xlink:to="lab_dei_AuditorName_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_BusinessContactMember_24" xlink:to="lab_dei_BusinessContactMember_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode_25" xlink:to="lab_dei_CityAreaCode_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_ContactPersonnelName_26" xlink:to="lab_dei_ContactPersonnelName_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract_27" xlink:to="lab_dei_CoverAbstract_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate_28" xlink:to="lab_dei_CurrentFiscalYearEndDate_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentAnnualReport_29" xlink:to="lab_dei_DocumentAnnualReport_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFinStmtErrorCorrectionFlag_30" xlink:to="lab_dei_DocumentFinStmtErrorCorrectionFlag_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalPeriodFocus_31" xlink:to="lab_dei_DocumentFiscalPeriodFocus_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalYearFocus_32" xlink:to="lab_dei_DocumentFiscalYearFocus_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate_33" xlink:to="lab_dei_DocumentPeriodEndDate_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentRegistrationStatement_34" xlink:to="lab_dei_DocumentRegistrationStatement_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentTransitionReport_35" xlink:to="lab_dei_DocumentTransitionReport_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType_36" xlink:to="lab_dei_DocumentType_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1_37" xlink:to="lab_dei_EntityAddressAddressLine1_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine2_38" xlink:to="lab_dei_EntityAddressAddressLine2_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown_39" xlink:to="lab_dei_EntityAddressCityOrTown_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_40" xlink:to="lab_dei_EntityAddressesAddressTypeAxis_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressesLineItems_41" xlink:to="lab_dei_EntityAddressesLineItems_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressesTable_42" xlink:to="lab_dei_EntityAddressesTable_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode_43" xlink:to="lab_dei_EntityAddressPostalZipCode_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince_44" xlink:to="lab_dei_EntityAddressStateOrProvince_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey_45" xlink:to="lab_dei_EntityCentralIndexKey_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding_46" xlink:to="lab_dei_EntityCommonStockSharesOutstanding_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus_47" xlink:to="lab_dei_EntityCurrentReportingStatus_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany_48" xlink:to="lab_dei_EntityEmergingGrowthCompany_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityExTransitionPeriod_49" xlink:to="lab_dei_EntityExTransitionPeriod_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber_50" xlink:to="lab_dei_EntityFileNumber_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityIncorporationStateCountryCode_51" xlink:to="lab_dei_EntityIncorporationStateCountryCode_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInteractiveDataCurrent_52" xlink:to="lab_dei_EntityInteractiveDataCurrent_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName_53" xlink:to="lab_dei_EntityRegistrantName_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_IcfrAuditorAttestationFlag_54" xlink:to="lab_dei_IcfrAuditorAttestationFlag_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber_55" xlink:to="lab_dei_LocalPhoneNumber_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle_56" xlink:to="lab_dei_Security12bTitle_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName_57" xlink:to="lab_dei_SecurityExchangeName_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol_58" xlink:to="lab_dei_TradingSymbol_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccountingProfit_59" xlink:to="lab_ifrs-full_AccountingProfit_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccountingProfit_60" xlink:to="lab_ifrs-full_AccountingProfit_1"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccountingProfit_61" xlink:to="lab_ifrs-full_AccountingProfit_2"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_62" xlink:to="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_0"/>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_63" xlink:to="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_1"/>
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