<?xml version="1.0" encoding="utf-8"?>
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
  <!-- INTEGIX by Ez-XBRL -->
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DocumentAndEntityInformation" roleURI="http://www.asanko.com/role/DocumentAndEntityInformation"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#StockholdersEquity" roleURI="http://www.asanko.com/role/StockholdersEquity"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#CommitmentsAndContingencies" roleURI="http://www.asanko.com/role/CommitmentsAndContingencies"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock" roleURI="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlock" roleURI="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlock"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock" roleURI="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#InvestmentinJointVentureTables" roleURI="http://www.asanko.com/role/InvestmentinJointVentureTables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlockTables" roleURI="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlockTables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#CommitmentsAndContingenciesTables" roleURI="http://www.asanko.com/role/CommitmentsAndContingenciesTables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlockTables" roleURI="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlockTables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NotesToFinancialStatementsDisclosureOfFairValueOfFinancialInstrumentsExplanatoryTextBlockTables" roleURI="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfFairValueOfFinancialInstrumentsExplanatoryTextBlockTables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#Notestofinancialstatementsdisclosureofrelatedpartyexplanatorytextblocktables" roleURI="http://www.asanko.com/role/Notestofinancialstatementsdisclosureofrelatedpartyexplanatorytextblocktables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NatureOfOperationsNarrativeDetails" roleURI="http://www.asanko.com/role/NatureOfOperationsNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EarningsLossPerShareAttributableToCommonShareholdersNarrativeDetails" roleURI="http://www.asanko.com/role/EarningsLossPerShareAttributableToCommonShareholdersNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#FinancialAssetsNarrativeDetails" roleURI="http://www.asanko.com/role/FinancialAssetsNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfCommitmentsExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfCommitmentsExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#InvestmentinJointVentureDetails" roleURI="http://www.asanko.com/role/InvestmentinJointVentureDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfFinancialRiskManagementExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfFinancialRiskManagementExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfFairValueOfFinancialInstrumentsExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfFairValueOfFinancialInstrumentsExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfSignificantInvestmentsInSubsidiariesExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfSignificantInvestmentsInSubsidiariesExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfDetailedInformationAboutEstimatedUsefulLifeOrDepreciationRateExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfDetailedInformationAboutEstimatedUsefulLifeOrDepreciationRateExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfDeferredTaxesExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfDeferredTaxesExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureOfDetailedInformatonAboutRedeemablePreferenceSharesWithNoFixedRedemptionDateDetails" roleURI="http://www.asanko.com/role/DisclosureOfDetailedInformatonAboutRedeemablePreferenceSharesWithNoFixedRedemptionDateDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfDetailedInformationAboutCommitmentsExplanatoryTableTextBlockDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfDetailedInformationAboutCommitmentsExplanatoryTableTextBlockDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureOfDetailedInformationAboutInvestmentInJointVentureUsingEquityMethodDetails" roleURI="http://www.asanko.com/role/DisclosureOfDetailedInformationAboutInvestmentInJointVentureUsingEquityMethodDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfGeographicAllocationOfTotalAssetsAndLiabilitiesExplanatoryTableTextBlockDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfGeographicAllocationOfTotalAssetsAndLiabilitiesExplanatoryTableTextBlockDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfGeographicAllocationOfTheStatementOfOperationsAndComprehensiveIncomeLossExplanatoryTableTextBlockDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfGeographicAllocationOfTheStatementOfOperationsAndComprehensiveIncomeLossExplanatoryTableTextBlockDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DisclosureDisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatoryDetails" roleURI="http://www.asanko.com/role/DisclosureDisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#IncomeTaxNarrativeDetails" roleURI="http://www.asanko.com/role/IncomeTaxNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesDisclosureOfNumberRSUsDetails" roleURI="http://www.asanko.com/role/EquityReservesDisclosureOfNumberRSUsDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesDisclosureOfMovementInRSULiabilityDetails" roleURI="http://www.asanko.com/role/EquityReservesDisclosureOfMovementInRSULiabilityDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfReconciliationOfTheMovementInPSUsDetails" roleURI="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfReconciliationOfTheMovementInPSUsDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfReconciliationOfTheMovementInDSUsDetails" roleURI="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfReconciliationOfTheMovementInDSUsDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInPSUsLiabilityDetails" roleURI="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInPSUsLiabilityDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInDSUsLiabilityDetails" roleURI="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInDSUsLiabilityDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInPhantomShareUnitLiabilityDetails" roleURI="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInPhantomShareUnitLiabilityDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#FinancialInstrumentsDisclosureOfDetailedInformationAboutFinancialInstrumentsByCategoryDetails" roleURI="http://www.asanko.com/role/FinancialInstrumentsDisclosureOfDetailedInformationAboutFinancialInstrumentsByCategoryDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#AcquisitionOfControlOfTheAGMDetails" roleURI="http://www.asanko.com/role/AcquisitionOfControlOfTheAGMDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#AcquisitionOfControlOfTheAGMDetails1" roleURI="http://www.asanko.com/role/AcquisitionOfControlOfTheAGMDetails1"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#AcquisitionOfControlOfTheAGMNarrativeDetails" roleURI="http://www.asanko.com/role/AcquisitionOfControlOfTheAGMNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DeferredAndContingentConsiderationDetails" roleURI="http://www.asanko.com/role/DeferredAndContingentConsiderationDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DeferredAndContingentConsiderationDetails1" roleURI="http://www.asanko.com/role/DeferredAndContingentConsiderationDetails1"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DeferredAndContingentConsiderationNarrativeDetails" roleURI="http://www.asanko.com/role/DeferredAndContingentConsiderationNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#DeferredAndContingentConsiderationTables" roleURI="http://www.asanko.com/role/DeferredAndContingentConsiderationTables"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#FinancialInstrumentsDisclosureOfDetailedInformationAboutLossesOnDerivativesDetails" roleURI="http://www.asanko.com/role/FinancialInstrumentsDisclosureOfDetailedInformationAboutLossesOnDerivativesDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#FinancialInstrumentsDisclosureOfDetailedInformationAboutSensitivityFairValuesOfFinancialLiabilitiesUnderlyingDiscountRateDetails" roleURI="http://www.asanko.com/role/FinancialInstrumentsDisclosureOfDetailedInformationAboutSensitivityFairValuesOfFinancialLiabilitiesUnderlyingDiscountRateDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#BasisOfPresentationDisclosureOfSubsidiariesNarrativeDetails" roleURI="http://www.asanko.com/role/BasisOfPresentationDisclosureOfSubsidiariesNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#ShareCapitalDisclosureOfIssuedAndOutstandingCommonSharesDetails" roleURI="http://www.asanko.com/role/ShareCapitalDisclosureOfIssuedAndOutstandingCommonSharesDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#NoncontrollingInterestNCINarrativeDetails" roleURI="http://www.asanko.com/role/NoncontrollingInterestNCINarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#JVServiceFeeNarrativeDetails" roleURI="http://www.asanko.com/role/JVServiceFeeNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#RevenueNarrativeDetails" roleURI="http://www.asanko.com/role/RevenueNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#RoyaltiesNarrativeDetails" roleURI="http://www.asanko.com/role/RoyaltiesNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#MINERALPROPERTIESPLANTANDEQUIPMENTNarrativeDetails" roleURI="http://www.asanko.com/role/MINERALPROPERTIESPLANTANDEQUIPMENTNarrativeDetails"/>
  <roleRef xlink:type="simple" xlink:href="gau-20241231.xsd#MineralPropertiesPlantAndEquipmentDisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentDetails" roleURI="http://www.asanko.com/role/MineralPropertiesPlantAndEquipmentDisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentDetails"/>
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll"/>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DocumentAndEntityInformation">
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressesLineItems" xlink:label="loc_dei_EntityAddressesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressesTable" xlink:label="loc_dei_EntityAddressesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressesAddressTypeAxis" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AddressTypeDomain" xlink:label="loc_dei_AddressTypeDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_BusinessContactMember" xlink:label="loc_dei_BusinessContactMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AddressTypeDomain" xlink:label="loc_dei_AddressTypeDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_12"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_13"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AmendmentDescription" xlink:label="loc_dei_AmendmentDescription_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_17"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityExTransitionPeriod" xlink:label="loc_dei_EntityExTransitionPeriod_19"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_20"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_21"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_22"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_23"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_24"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_25"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_26"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_27"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_dei_EntityAddressAddressLine2_28"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_29"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_30"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_31"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_32"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_33"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AnnualInformationForm" xlink:label="loc_dei_AnnualInformationForm_34"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AuditedAnnualFinancialStatements" xlink:label="loc_dei_AuditedAnnualFinancialStatements_35"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentAnnualReport" xlink:label="loc_dei_DocumentAnnualReport_36"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentRegistrationStatement" xlink:label="loc_dei_DocumentRegistrationStatement_37"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_38"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_39"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_ContactPersonnelName" xlink:label="loc_dei_ContactPersonnelName_40"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressCountry" xlink:label="loc_dei_EntityAddressCountry_41"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AuditorFirmId" xlink:label="loc_dei_AuditorFirmId_42"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AuditorName" xlink:label="loc_dei_AuditorName_43"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AuditorLocation" xlink:label="loc_dei_AuditorLocation_44"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentFinStmtErrorCorrectionFlag" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag_45"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityAddressesTable_1" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_1" xlink:to="loc_dei_AddressTypeDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_1" xlink:to="loc_dei_BusinessContactMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_1" xlink:to="loc_dei_AddressTypeDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityRegistrantName_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityCentralIndexKey_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityCurrentReportingStatus_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_CurrentFiscalYearEndDate_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentType_10" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentPeriodEndDate_11" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_12" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AmendmentFlag_13" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AmendmentDescription_14" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_TradingSymbol_15" order="100" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentFiscalYearFocus_16" order="110" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentFiscalPeriodFocus_17" order="120" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityEmergingGrowthCompany_18" order="130" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityExTransitionPeriod_19" order="140" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityFilerCategory_20" order="150" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityInteractiveDataCurrent_21" order="160" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityVoluntaryFilers_22" order="170" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_23" order="180" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityPublicFloat_24" order="190" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityFileNumber_25" order="200" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityIncorporationStateCountryCode_26" order="210" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressAddressLine1_27" order="220" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressAddressLine2_28" order="230" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressCityOrTown_29" order="240" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressStateOrProvince_30" order="250" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressPostalZipCode_31" order="260" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_CityAreaCode_32" order="270" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_LocalPhoneNumber_33" order="280" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AnnualInformationForm_34" order="290" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AuditedAnnualFinancialStatements_35" order="300" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentAnnualReport_36" order="310" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentRegistrationStatement_37" order="320" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_SecurityExchangeName_38" order="330" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_Security12bTitle_39" order="340" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_ContactPersonnelName_40" order="350" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_EntityAddressCountry_41" order="360" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AuditorFirmId_42" order="370" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AuditorName_43" order="380" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_AuditorLocation_44" order="390" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_0" xlink:to="loc_dei_DocumentFinStmtErrorCorrectionFlag_45" order="400" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/StockholdersEquity">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IssuedCapitalMember" xlink:label="loc_ifrs-full_IssuedCapitalMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherReservesMember" xlink:label="loc_ifrs-full_OtherReservesMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RetainedEarningsMember" xlink:label="loc_ifrs-full_RetainedEarningsMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_4"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCosts" xlink:label="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCosts_11"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCostsShares" xlink:label="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCostsShares_12"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_13"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughExerciseOfOptionsShares" xlink:label="loc_gau_IncreaseDecreaseThroughExerciseOfOptionsShares_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughNoncontrollingInterestAssumedInAcquisition" xlink:label="loc_gau_IncreaseDecreaseThroughNoncontrollingInterestAssumedInAcquisition_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_17"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_1" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_1" xlink:to="loc_ifrs-full_IssuedCapitalMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_1" xlink:to="loc_ifrs-full_OtherReservesMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_1" xlink:to="loc_ifrs-full_RetainedEarningsMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_1" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_1" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_Equity_9" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_10" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCosts_11" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCostsShares_12" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_13" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughExerciseOfOptionsShares_14" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughNoncontrollingInterestAssumedInAcquisition_15" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_16" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_ComprehensiveIncome_17" order="90" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/CommitmentsAndContingencies">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfCashFlowStatementExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCashFlowStatementExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfCashFlowStatementExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlock">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:label="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/InvestmentinJointVentureTables">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesLineItems" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesTable" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineMember" xlink:label="loc_gau_AsankoGoldMineMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutInvestmentInJointVentureExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutInvestmentInJointVentureExplanatory_6"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesTable_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1" xlink:to="loc_gau_AsankoGoldMineMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutInvestmentInJointVentureExplanatory_6" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlockTables">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_EarningsPerShareExplanatory" xlink:label="loc_ifrs-full_EarningsPerShareExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_EarningsPerShareExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/CommitmentsAndContingenciesTables">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutCommitmentsExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutCommitmentsExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutCommitmentsExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlockTables">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfChangesInNoncashWorkingCapitalExplanatory" xlink:label="loc_gau_DisclosureOfChangesInNoncashWorkingCapitalExplanatory_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutCashFlowInformationExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutCashFlowInformationExplanatory_6"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_DisclosureOfChangesInNoncashWorkingCapitalExplanatory_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutCashFlowInformationExplanatory_6" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NotesToFinancialStatementsDisclosureOfFairValueOfFinancialInstrumentsExplanatoryTextBlockTables">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_ifrs-full_CurrencyRiskMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutFinancialInstrumentsByCategoryExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutFinancialInstrumentsByCategoryExplanatory_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutLossesOnDerivativesExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutLossesOnDerivativesExplanatory_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutFinancialLiabilitiesForDecreaseIncreaseInUnderlyingDiscountRateExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutFinancialLiabilitiesForDecreaseIncreaseInUnderlyingDiscountRateExplanatory_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_TypesOfRisksAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_1" xlink:to="loc_ifrs-full_TypesOfRisksDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_1" xlink:to="loc_ifrs-full_CurrencyRiskMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_1" xlink:to="loc_ifrs-full_TypesOfRisksDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutFinancialInstrumentsByCategoryExplanatory_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutLossesOnDerivativesExplanatory_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutFinancialLiabilitiesForDecreaseIncreaseInUnderlyingDiscountRateExplanatory_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory_9" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/Notestofinancialstatementsdisclosureofrelatedpartyexplanatorytextblocktables">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_5"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_dei_LegalEntityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1" xlink:to="loc_dei_EntityDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_5" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NatureOfOperationsNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesLineItems" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesTable" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineMember" xlink:label="loc_gau_AsankoGoldMineMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ProportionOfOwnershipInterestsHeldByGovernmentOfGhana" xlink:label="loc_gau_ProportionOfOwnershipInterestsHeldByGovernmentOfGhana_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AsankoGoldMineMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_ProportionOfOwnershipInterestsHeldByGovernmentOfGhana_8" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EarningsLossPerShareAttributableToCommonShareholdersNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareLineItems" xlink:label="loc_ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareTable" xlink:label="loc_ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfAntidilutiveInstrumentsAxis" xlink:label="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfAntidilutiveInstrumentsDomain" xlink:label="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ShareOptionsMember" xlink:label="loc_ifrs-full_ShareOptionsMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfAntidilutiveInstrumentsDomain" xlink:label="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfInstrumentsThatAreAntidilutiveInPeriodPresented" xlink:label="loc_ifrs-full_NumberOfInstrumentsThatAreAntidilutiveInPeriodPresented_6"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareTable_1" xlink:to="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_1" xlink:to="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_1" xlink:to="loc_ifrs-full_ShareOptionsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_1" xlink:to="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareLineItems_0" xlink:to="loc_ifrs-full_NumberOfInstrumentsThatAreAntidilutiveInPeriodPresented_6" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/FinancialAssetsNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_4"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_4"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_4"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedemptionDateAxis" xlink:label="loc_gau_RedemptionDateAxis_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedemptionDateDomain" xlink:label="loc_gau_RedemptionDateDomain_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedeemablePreferenceShareWithDeterminableRedemptionDateMember" xlink:label="loc_gau_RedeemablePreferenceShareWithDeterminableRedemptionDateMember_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedeemablePreferenceSharesWithNoFixedRedemptionDateMember" xlink:label="loc_gau_RedeemablePreferenceSharesWithNoFixedRedemptionDateMember_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedemptionDateDomain" xlink:label="loc_gau_RedemptionDateDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueOfPreferenceSharesSubscribed" xlink:label="loc_gau_FairValueOfPreferenceSharesSubscribed_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueAdjustmentRedeemablePreferenceShares" xlink:label="loc_gau_FairValueAdjustmentRedeemablePreferenceShares_15"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedemptionOfPreferredSharesAmount" xlink:label="loc_gau_RedemptionOfPreferredSharesAmount_16"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_4" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_4" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_4" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_4" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_4" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_4" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" xlink:to="loc_gau_RedemptionDateAxis_8" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_RedemptionDateAxis_8" xlink:to="loc_gau_RedemptionDateDomain_8" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_RedemptionDateDomain_8" xlink:to="loc_gau_RedeemablePreferenceShareWithDeterminableRedemptionDateMember_8" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_RedemptionDateDomain_8" xlink:to="loc_gau_RedeemablePreferenceSharesWithNoFixedRedemptionDateMember_9" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_RedemptionDateAxis_8" xlink:to="loc_gau_RedemptionDateDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_FairValueOfPreferenceSharesSubscribed_14" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_FairValueAdjustmentRedeemablePreferenceShares_15" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_RedemptionOfPreferredSharesAmount_16" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SharePurchaseWarrantsIssuedToRedKiteInConjunctionWithDrawdownOfFinalTwoZeroZeroMillionOfLoanFacilityMember" xlink:label="loc_gau_SharePurchaseWarrantsIssuedToRedKiteInConjunctionWithDrawdownOfFinalTwoZeroZeroMillionOfLoanFacilityMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RestrictedShareUnitsMember" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitsMember" xlink:label="loc_gau_PerformanceShareUnitsMember_3"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitsMember" xlink:label="loc_gau_DeferredShareUnitsMember_4"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PhantomShareUnitsMember" xlink:label="loc_gau_PhantomShareUnitsMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeDomain" xlink:label="loc_ifrs-full_RangeDomain_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeDomain" xlink:label="loc_ifrs-full_RangeDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionForNumberOfSharesIssuableUnderTwoPlans" xlink:label="loc_gau_DescriptionForNumberOfSharesIssuableUnderTwoPlans_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ExplanationOfShareOptionsInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_ExplanationOfShareOptionsInSharebasedPaymentArrangement_16"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ForefeitureRateRestrictedShareUnitsGranted" xlink:label="loc_gau_ForefeitureRateRestrictedShareUnitsGranted_17"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DescriptionOfVestingRequirementsForSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_DescriptionOfVestingRequirementsForSharebasedPaymentArrangement_18"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PercentageOfPerformanceMultiplier" xlink:label="loc_gau_PercentageOfPerformanceMultiplier_19"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ShareBasedPaymentsCapitalizedToMineralProperties" xlink:label="loc_gau_ShareBasedPaymentsCapitalizedToMineralProperties_20"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilities" xlink:label="loc_ifrs-full_FinancialLiabilities_21"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitsSettledInCash" xlink:label="loc_gau_DeferredShareUnitsSettledInCash_22"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PhantomSharesGranted" xlink:label="loc_gau_PhantomSharesGranted_23"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_SharePurchaseWarrantsIssuedToRedKiteInConjunctionWithDrawdownOfFinalTwoZeroZeroMillionOfLoanFacilityMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_PerformanceShareUnitsMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_DeferredShareUnitsMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_PhantomShareUnitsMember_5" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_ifrs-full_RangeAxis_9" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_9" xlink:to="loc_ifrs-full_RangeDomain_9" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_9" xlink:to="loc_ifrs-full_BottomOfRangeMember_9" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_9" xlink:to="loc_ifrs-full_TopOfRangeMember_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_9" xlink:to="loc_ifrs-full_RangeDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_DescriptionForNumberOfSharesIssuableUnderTwoPlans_15" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_ExplanationOfShareOptionsInSharebasedPaymentArrangement_16" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_ForefeitureRateRestrictedShareUnitsGranted_17" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DescriptionOfVestingRequirementsForSharebasedPaymentArrangement_18" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PercentageOfPerformanceMultiplier_19" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_ShareBasedPaymentsCapitalizedToMineralProperties_20" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_FinancialLiabilities_21" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_DeferredShareUnitsSettledInCash_22" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PhantomSharesGranted_23" order="90" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfCommitmentsExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsLineItems" xlink:label="loc_gau_StatementsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_StatementsTable" xlink:label="loc_gau_StatementsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldGhanaLimitedMember" xlink:label="loc_gau_AsankoGoldGhanaLimitedMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts" xlink:label="loc_ifrs-full_ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfZeroCostCollarHedges" xlink:label="loc_gau_DescriptionOfZeroCostCollarHedges_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ContingentPaymentsToGoldFields" xlink:label="loc_gau_ContingentPaymentsToGoldFields_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_StatementsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_StatementsTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AsankoGoldGhanaLimitedMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_ifrs-full_ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_DescriptionOfZeroCostCollarHedges_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_StatementsLineItems_0" xlink:to="loc_gau_ContingentPaymentsToGoldFields_8" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/InvestmentinJointVentureDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesLineItems" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesTable" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PercentageOfInterestAccountedForUsingEquityMethod" xlink:label="loc_gau_PercentageOfInterestAccountedForUsingEquityMethod_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NetEarningsInJV" xlink:label="loc_gau_NetEarningsInJV_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueOfGainOnDerecognitionOfEquityInvestment" xlink:label="loc_gau_FairValueOfGainOnDerecognitionOfEquityInvestment_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesTable_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_PercentageOfInterestAccountedForUsingEquityMethod_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_NetEarningsInJV_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_FairValueOfGainOnDerecognitionOfEquityInvestment_8" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfFinancialRiskManagementExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CapitalManagementLineItems" xlink:label="loc_gau_CapitalManagementLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CapitalManagementTable" xlink:label="loc_gau_CapitalManagementTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AgreementAxis" xlink:label="loc_gau_AgreementAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AgreementDomain" xlink:label="loc_gau_AgreementDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AtMarketOfferingMember" xlink:label="loc_gau_AtMarketOfferingMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AgreementDomain" xlink:label="loc_gau_AgreementDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_HcWainwrightAndCompanyAndCormarkSecuritiesMember" xlink:label="loc_gau_HcWainwrightAndCompanyAndCormarkSecuritiesMember_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ValueOfSharesApprovedUnderAtMarketOffering" xlink:label="loc_gau_ValueOfSharesApprovedUnderAtMarketOffering_11"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_CapitalManagementLineItems_0" xlink:to="loc_gau_CapitalManagementTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_CapitalManagementTable_1" xlink:to="loc_gau_AgreementAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_AgreementAxis_1" xlink:to="loc_gau_AgreementDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AgreementDomain_1" xlink:to="loc_gau_AtMarketOfferingMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_AgreementAxis_1" xlink:to="loc_gau_AgreementDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_CapitalManagementTable_1" xlink:to="loc_dei_LegalEntityAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5" xlink:to="loc_dei_EntityDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5" xlink:to="loc_gau_HcWainwrightAndCompanyAndCormarkSecuritiesMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5" xlink:to="loc_dei_EntityDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CapitalManagementLineItems_0" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CapitalManagementLineItems_0" xlink:to="loc_gau_ValueOfSharesApprovedUnderAtMarketOffering_11" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfFairValueOfFinancialInstrumentsExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrencySwapContractMember" xlink:label="loc_ifrs-full_CurrencySwapContractMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ForwardContractMember" xlink:label="loc_ifrs-full_ForwardContractMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CreditRiskMember" xlink:label="loc_ifrs-full_CreditRiskMember_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_InterestRateRiskMember" xlink:label="loc_ifrs-full_InterestRateRiskMember_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_ifrs-full_CurrencyRiskMember_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CommodityPriceRiskMember" xlink:label="loc_ifrs-full_CommodityPriceRiskMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesMember" xlink:label="loc_ifrs-full_JointVenturesMember_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PreferenceSharesMember" xlink:label="loc_ifrs-full_PreferenceSharesMember_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ValueAddedTaxReceivables" xlink:label="loc_ifrs-full_ValueAddedTaxReceivables_23"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_InterestReceivable" xlink:label="loc_ifrs-full_InterestReceivable_24"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferenceSharesRedeemableShareSubscribed" xlink:label="loc_gau_PreferenceSharesRedeemableShareSubscribed_25"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_MaximumExposureToCreditRisk" xlink:label="loc_ifrs-full_MaximumExposureToCreditRisk_26"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="loc_ifrs-full_CashAndCashEquivalents_27"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrentLiabilities" xlink:label="loc_ifrs-full_CurrentLiabilities_28"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseInAfterTaxNetLossDueToChangeInAnnualizedInterest" xlink:label="loc_gau_IncreaseInAfterTaxNetLossDueToChangeInAnnualizedInterest_29"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DecreaseInAfterTaxNetLossDueToChangeInAnnualizedInterestRate" xlink:label="loc_gau_DecreaseInAfterTaxNetLossDueToChangeInAnnualizedInterestRate_30"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MineralResourcesOuncesOfGold" xlink:label="loc_gau_MineralResourcesOuncesOfGold_31"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AverageInterestRateEarnedOnCashAndCashEquivalents" xlink:label="loc_gau_AverageInterestRateEarnedOnCashAndCashEquivalents_32"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ValueAtRisk" xlink:label="loc_ifrs-full_ValueAtRisk_33"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferenceSharesValueDeterminingCreditRisk" xlink:label="loc_gau_PreferenceSharesValueDeterminingCreditRisk_34"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ValueOfPreferenceSharesRelatedToCreditRisk" xlink:label="loc_gau_ValueOfPreferenceSharesRelatedToCreditRisk_35"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ReceivablesFromPreciousMetalSales" xlink:label="loc_gau_ReceivablesFromPreciousMetalSales_36"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NoncurrentReceivablesDueFromJointVentures" xlink:label="loc_ifrs-full_NoncurrentReceivablesDueFromJointVentures_37"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PrincipalRepaymentsOfAmendedTermSheet" xlink:label="loc_gau_PrincipalRepaymentsOfAmendedTermSheet_38"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BorrowingsInterestRateBasis" xlink:label="loc_ifrs-full_BorrowingsInterestRateBasis_39"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DerivativeFinancialLiabilities" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities_40"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" xlink:to="loc_ifrs-full_CurrencySwapContractMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" xlink:to="loc_ifrs-full_ForwardContractMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_TypesOfRisksAxis_7" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_7" xlink:to="loc_ifrs-full_TypesOfRisksDomain_7" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_7" xlink:to="loc_ifrs-full_CreditRiskMember_7" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_7" xlink:to="loc_ifrs-full_InterestRateRiskMember_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_7" xlink:to="loc_ifrs-full_CurrencyRiskMember_9" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_7" xlink:to="loc_ifrs-full_CommodityPriceRiskMember_10" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_7" xlink:to="loc_ifrs-full_TypesOfRisksDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_JointVenturesAxis_14" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_14" xlink:to="loc_ifrs-full_JointVenturesDomain_14" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_14" xlink:to="loc_ifrs-full_JointVenturesMember_14" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_14" xlink:to="loc_ifrs-full_JointVenturesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_18" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_18" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_18" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_18" xlink:to="loc_ifrs-full_PreferenceSharesMember_18" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_18" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_ValueAddedTaxReceivables_23" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_InterestReceivable_24" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_PreferenceSharesRedeemableShareSubscribed_25" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_MaximumExposureToCreditRisk_26" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_CashAndCashEquivalents_27" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_CurrentLiabilities_28" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_IncreaseInAfterTaxNetLossDueToChangeInAnnualizedInterest_29" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_DecreaseInAfterTaxNetLossDueToChangeInAnnualizedInterestRate_30" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_MineralResourcesOuncesOfGold_31" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_AverageInterestRateEarnedOnCashAndCashEquivalents_32" order="100" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_ValueAtRisk_33" order="110" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_PreferenceSharesValueDeterminingCreditRisk_34" order="120" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_ValueOfPreferenceSharesRelatedToCreditRisk_35" order="130" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_ReceivablesFromPreciousMetalSales_36" order="140" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_NoncurrentReceivablesDueFromJointVentures_37" order="150" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_PrincipalRepaymentsOfAmendedTermSheet_38" order="160" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_BorrowingsInterestRateBasis_39" order="170" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilities_40" order="180" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfSignificantInvestmentsInSubsidiariesExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GalianoGoldSouthAfricaPtyLtdMember" xlink:label="loc_gau_GalianoGoldSouthAfricaPtyLtdMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GalianoInternationalIsleOfManLimitedMember" xlink:label="loc_gau_GalianoInternationalIsleOfManLimitedMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GalianoGoldIsleOfManLimitedMember" xlink:label="loc_gau_GalianoGoldIsleOfManLimitedMember_3"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GalianoGoldMaliExplorationSarlMember" xlink:label="loc_gau_GalianoGoldMaliExplorationSarlMember_4"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GalianoGoldExplorationGhanaLtdMember" xlink:label="loc_gau_GalianoGoldExplorationGhanaLtdMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_BUKWestAfricaLimitedMember" xlink:label="loc_gau_BUKWestAfricaLimitedMember_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldGhanaLimitedMember" xlink:label="loc_gau_AsankoGoldGhanaLimitedMember_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AdansiGoldCompanyGhanaLimitedMember" xlink:label="loc_gau_AdansiGoldCompanyGhanaLimitedMember_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ShikaGroupFinanceLimitedMember" xlink:label="loc_gau_ShikaGroupFinanceLimitedMember_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GalianoGoldNetherlandsBVMember" xlink:label="loc_gau_GalianoGoldNetherlandsBVMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_15"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_GalianoGoldSouthAfricaPtyLtdMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_GalianoInternationalIsleOfManLimitedMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_GalianoGoldIsleOfManLimitedMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_GalianoGoldMaliExplorationSarlMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_GalianoGoldExplorationGhanaLtdMember_5" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_BUKWestAfricaLimitedMember_6" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AsankoGoldGhanaLimitedMember_7" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AdansiGoldCompanyGhanaLimitedMember_8" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_ShikaGroupFinanceLimitedMember_9" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_GalianoGoldNetherlandsBVMember_10" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_15" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfDetailedInformationAboutEstimatedUsefulLifeOrDepreciationRateExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ProcessingPlantRelatedComponentsAndInfrastructureMember" xlink:label="loc_gau_ProcessingPlantRelatedComponentsAndInfrastructureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_MiningPropertyMember" xlink:label="loc_ifrs-full_MiningPropertyMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComputerEquipmentMember" xlink:label="loc_ifrs-full_ComputerEquipmentMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RightofuseAssetsMember" xlink:label="loc_ifrs-full_RightofuseAssetsMember_4"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_UsefulLivesOrDepreciationRatesEquipment" xlink:label="loc_gau_UsefulLivesOrDepreciationRatesEquipment_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1" xlink:to="loc_gau_ProcessingPlantRelatedComponentsAndInfrastructureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1" xlink:to="loc_ifrs-full_MiningPropertyMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1" xlink:to="loc_ifrs-full_ComputerEquipmentMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1" xlink:to="loc_ifrs-full_RightofuseAssetsMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_gau_UsefulLivesOrDepreciationRatesEquipment_9" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfDeferredTaxesExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfIncomeTaxLineItems" xlink:label="loc_gau_DisclosureOfIncomeTaxLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfIncomeTaxTable" xlink:label="loc_gau_DisclosureOfIncomeTaxTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis" xlink:label="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain" xlink:label="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredFinancingCostsMember" xlink:label="loc_gau_DeferredFinancingCostsMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_MiscellaneousOtherProvisionsMember" xlink:label="loc_ifrs-full_MiscellaneousOtherProvisionsMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RightOfUseAssetMember" xlink:label="loc_gau_RightOfUseAssetMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_UnusedTaxLossesMember" xlink:label="loc_ifrs-full_UnusedTaxLossesMember_4"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NonCapitalLossesMember" xlink:label="loc_gau_NonCapitalLossesMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AcceleratedCapitalDeductionMember" xlink:label="loc_gau_AcceleratedCapitalDeductionMember_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AssetRetirementProvisionsMember" xlink:label="loc_gau_AssetRetirementProvisionsMember_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LeaseLiabilityMember" xlink:label="loc_gau_LeaseLiabilityMember_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_OtherDeferredTaxLiabilitiesMember" xlink:label="loc_gau_OtherDeferredTaxLiabilitiesMember_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain" xlink:label="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DeferredTaxAssets" xlink:label="loc_ifrs-full_DeferredTaxAssets_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DeferredTaxLiabilities" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NetDeferredTaxAssets" xlink:label="loc_ifrs-full_NetDeferredTaxAssets_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NetDeferredTaxLiabilities" xlink:label="loc_ifrs-full_NetDeferredTaxLiabilities_17"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_gau_DisclosureOfIncomeTaxTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_DisclosureOfIncomeTaxTable_1" xlink:to="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1" xlink:to="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_DeferredFinancingCostsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_MiscellaneousOtherProvisionsMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_RightOfUseAssetMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_UnusedTaxLossesMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_NonCapitalLossesMember_5" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_AcceleratedCapitalDeductionMember_6" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_AssetRetirementProvisionsMember_7" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_LeaseLiabilityMember_8" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_OtherDeferredTaxLiabilitiesMember_9" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1" xlink:to="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_DeferredTaxAssets_14" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_15" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_NetDeferredTaxAssets_16" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_NetDeferredTaxLiabilities_17" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfIncomeTaxLineItems" xlink:label="loc_gau_DisclosureOfIncomeTaxLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfIncomeTaxTable" xlink:label="loc_gau_DisclosureOfIncomeTaxTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis" xlink:label="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain" xlink:label="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_UnusedTaxCreditsMember" xlink:label="loc_ifrs-full_UnusedTaxCreditsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MineralInterestsMember" xlink:label="loc_gau_MineralInterestsMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_InvestmentInAssociateMember" xlink:label="loc_gau_InvestmentInAssociateMember_3"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AccountsPayablesAndAccruedLiabilitiesMember" xlink:label="loc_gau_AccountsPayablesAndAccruedLiabilitiesMember_4"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LeaseLiabilityMember" xlink:label="loc_gau_LeaseLiabilityMember_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ContingentLiabilityForDecommissioningRestorationAndRehabilitationCostsMember" xlink:label="loc_ifrs-full_ContingentLiabilityForDecommissioningRestorationAndRehabilitationCostsMember_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CapitalLossesMember" xlink:label="loc_gau_CapitalLossesMember_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_OtherPropertyPlantAndEquipmentMember_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ShareIssuanceCostsMember" xlink:label="loc_gau_ShareIssuanceCostsMember_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ForeignExchangeLossCarriedForwardMember" xlink:label="loc_gau_ForeignExchangeLossCarriedForwardMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_UnrealisedForeignExchangeGainsLossesMember" xlink:label="loc_ifrs-full_UnrealisedForeignExchangeGainsLossesMember_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherTemporaryDifferencesMember" xlink:label="loc_ifrs-full_OtherTemporaryDifferencesMember_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain" xlink:label="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:label="loc_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_17"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_gau_DisclosureOfIncomeTaxTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_DisclosureOfIncomeTaxTable_1" xlink:to="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1" xlink:to="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_UnusedTaxCreditsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_MineralInterestsMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_InvestmentInAssociateMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_AccountsPayablesAndAccruedLiabilitiesMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_LeaseLiabilityMember_5" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_ContingentLiabilityForDecommissioningRestorationAndRehabilitationCostsMember_6" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_CapitalLossesMember_7" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_OtherPropertyPlantAndEquipmentMember_8" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_ShareIssuanceCostsMember_9" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_gau_ForeignExchangeLossCarriedForwardMember_10" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_UnrealisedForeignExchangeGainsLossesMember_11" order="100" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_1" xlink:to="loc_ifrs-full_OtherTemporaryDifferencesMember_12" order="110" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsAxis_1" xlink:to="loc_gau_SignificantComponentsOfDeferredTaxLiabilitiesAndAssetsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_17" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureOfDetailedInformatonAboutRedeemablePreferenceSharesWithNoFixedRedemptionDateDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferenceSharesHeldAxis" xlink:label="loc_gau_PreferenceSharesHeldAxis_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferenceSharesHeldDomain" xlink:label="loc_gau_PreferenceSharesHeldDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferenceSharesHeldInJointVentureMember" xlink:label="loc_gau_PreferenceSharesHeldInJointVentureMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferenceSharesHeldDomain" xlink:label="loc_gau_PreferenceSharesHeldDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NumberOfPreferenceShares" xlink:label="loc_gau_NumberOfPreferenceShares_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialAssets" xlink:label="loc_ifrs-full_FinancialAssets_11"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueAdjustmentRedeemablePreferenceShares" xlink:label="loc_gau_FairValueAdjustmentRedeemablePreferenceShares_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedemptionOfPreferredSharesDuringYearShares" xlink:label="loc_gau_RedemptionOfPreferredSharesDuringYearShares_13"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RedemptionOfPreferredSharesAmount" xlink:label="loc_gau_RedemptionOfPreferredSharesAmount_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DerecognitionOnClosingOfAcquisitionShares" xlink:label="loc_gau_DerecognitionOnClosingOfAcquisitionShares_15"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DerecognitionOnClosingOfAcquisitionAmout" xlink:label="loc_gau_DerecognitionOnClosingOfAcquisitionAmout_16"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_1" xlink:to="loc_gau_PreferenceSharesHeldAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_PreferenceSharesHeldAxis_5" xlink:to="loc_gau_PreferenceSharesHeldDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_PreferenceSharesHeldDomain_5" xlink:to="loc_gau_PreferenceSharesHeldInJointVentureMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_PreferenceSharesHeldAxis_5" xlink:to="loc_gau_PreferenceSharesHeldDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_NumberOfPreferenceShares_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_ifrs-full_FinancialAssets_11" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_FairValueAdjustmentRedeemablePreferenceShares_12" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_RedemptionOfPreferredSharesDuringYearShares_13" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_RedemptionOfPreferredSharesAmount_14" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_DerecognitionOnClosingOfAcquisitionShares_15" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_0" xlink:to="loc_gau_DerecognitionOnClosingOfAcquisitionAmout_16" order="70" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CZeroZeroZeroCOneZeroZeroMember" xlink:label="loc_gau_CZeroZeroZeroCOneZeroZeroMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_COneZeroZeroCTwoZeroZeroMember" xlink:label="loc_gau_COneZeroZeroCTwoZeroZeroMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CTwoZeroOneCThreeZeroZeroMember" xlink:label="loc_gau_CTwoZeroOneCThreeZeroZeroMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeDomain" xlink:label="loc_ifrs-full_RangeDomain_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeDomain" xlink:label="loc_ifrs-full_RangeDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:label="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_13"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" xlink:label="loc_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_17"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_WeightedAverageRemainingContractualLifeOfExercisableShareOptions" xlink:label="loc_gau_WeightedAverageRemainingContractualLifeOfExercisableShareOptions_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019_19"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_1" xlink:to="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_1" xlink:to="loc_gau_CZeroZeroZeroCOneZeroZeroMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_1" xlink:to="loc_gau_COneZeroZeroCTwoZeroZeroMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_1" xlink:to="loc_gau_CTwoZeroOneCThreeZeroZeroMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_1" xlink:to="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_ifrs-full_RangeAxis_7" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_7" xlink:to="loc_ifrs-full_RangeDomain_7" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_7" xlink:to="loc_ifrs-full_BottomOfRangeMember_7" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_7" xlink:to="loc_ifrs-full_TopOfRangeMember_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_7" xlink:to="loc_ifrs-full_RangeDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_13" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOutstandingShareOptions_14" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_15" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_16" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_17" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_WeightedAverageRemainingContractualLifeOfExercisableShareOptions_18" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019_19" order="70" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfDetailedInformationAboutCommitmentsExplanatoryTableTextBlockDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesTable" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="loc_ifrs-full_MaturityDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="loc_ifrs-full_MaturityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AccountsPayableAndAccruedLiabilitieExcludingCommitments" xlink:label="loc_gau_AccountsPayableAndAccruedLiabilitieExcludingCommitments_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ZccGoldHedges" xlink:label="loc_gau_ZccGoldHedges_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LongTermIncentivePlanCashSettledAwardsContractualObligationsExcludingCommitments" xlink:label="loc_gau_LongTermIncentivePlanCashSettledAwardsContractualObligationsExcludingCommitments_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MiningAndOtherServicesContracts" xlink:label="loc_gau_MiningAndOtherServicesContracts_11"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AssetRetirementProvisionsUndiscounted" xlink:label="loc_gau_AssetRetirementProvisionsUndiscounted_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredAndContingentConsiderationUndiscounted" xlink:label="loc_gau_DeferredAndContingentConsiderationUndiscounted_13"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CorporateOperatingLeases" xlink:label="loc_gau_CorporateOperatingLeases_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ContractualObligations" xlink:label="loc_gau_ContractualObligations_15"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_1" xlink:to="loc_ifrs-full_MaturityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_1" xlink:to="loc_ifrs-full_MaturityDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_1" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_1" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_1" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_1" xlink:to="loc_ifrs-full_MaturityDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_AccountsPayableAndAccruedLiabilitieExcludingCommitments_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_ZccGoldHedges_9" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_LongTermIncentivePlanCashSettledAwardsContractualObligationsExcludingCommitments_10" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_MiningAndOtherServicesContracts_11" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_AssetRetirementProvisionsUndiscounted_12" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_DeferredAndContingentConsiderationUndiscounted_13" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_CorporateOperatingLeases_14" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_0" xlink:to="loc_gau_ContractualObligations_15" order="80" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureOfDetailedInformationAboutInvestmentInJointVentureUsingEquityMethodDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_InvestmentsInJointVentures" xlink:label="loc_ifrs-full_InvestmentsInJointVentures_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueAdjustmentOnDerecognition" xlink:label="loc_gau_FairValueAdjustmentOnDerecognition_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DerecognitionOnClosingOfAcquisition" xlink:label="loc_gau_DerecognitionOnClosingOfAcquisition_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0" xlink:to="loc_ifrs-full_InvestmentsInJointVentures_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0" xlink:to="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0" xlink:to="loc_gau_FairValueAdjustmentOnDerecognition_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0" xlink:to="loc_gau_DerecognitionOnClosingOfAcquisition_9" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfGeographicAllocationOfTotalAssetsAndLiabilitiesExplanatoryTableTextBlockDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="loc_ifrs-full_GeographicalAreasAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="loc_ifrs-full_GeographicalAreasDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_CA" xlink:label="loc_country_CA_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_GH" xlink:label="loc_country_GH_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_AfricaMember" xlink:label="loc_srt_AfricaMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="loc_ifrs-full_GeographicalAreasDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrentAssets" xlink:label="loc_ifrs-full_CurrentAssets_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PropertyPlantAndEquipmentAndRightOfUseAssets" xlink:label="loc_gau_PropertyPlantAndEquipmentAndRightOfUseAssets_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherNoncurrentAssets" xlink:label="loc_ifrs-full_OtherNoncurrentAssets_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_Assets" xlink:label="loc_ifrs-full_Assets_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrentLiabilities" xlink:label="loc_ifrs-full_CurrentLiabilities_12"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NoncurrentLiabilities" xlink:label="loc_ifrs-full_NoncurrentLiabilities_13"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_Liabilities" xlink:label="loc_ifrs-full_Liabilities_14"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1" xlink:to="loc_ifrs-full_GeographicalAreasAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_1" xlink:to="loc_ifrs-full_GeographicalAreasDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_country_CA_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_country_GH_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_srt_AfricaMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_1" xlink:to="loc_ifrs-full_GeographicalAreasDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_CurrentAssets_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_gau_PropertyPlantAndEquipmentAndRightOfUseAssets_9" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_OtherNoncurrentAssets_10" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_Assets_11" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_CurrentLiabilities_12" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_NoncurrentLiabilities_13" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_Liabilities_14" order="70" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfGeographicAllocationOfTheStatementOfOperationsAndComprehensiveIncomeLossExplanatoryTableTextBlockDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="loc_ifrs-full_GeographicalAreasAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="loc_ifrs-full_GeographicalAreasDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_CA" xlink:label="loc_country_CA_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_GH" xlink:label="loc_country_GH_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_AfricaMember" xlink:label="loc_srt_AfricaMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="loc_ifrs-full_GeographicalAreasDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CostOfSalesAbstract" xlink:label="loc_gau_CostOfSalesAbstract_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ProductionCost" xlink:label="loc_gau_ProductionCost_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DepreciationExpense" xlink:label="loc_ifrs-full_DepreciationExpense_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RoyaltyExpense" xlink:label="loc_ifrs-full_RoyaltyExpense_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GrossProfit" xlink:label="loc_ifrs-full_GrossProfit_13"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_TerminationOfOfftakeAgreement" xlink:label="loc_gau_TerminationOfOfftakeAgreement_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:label="loc_ifrs-full_SellingGeneralAndAdministrativeExpense_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources" xlink:label="loc_ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources_17"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_18"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ServiceFeeIncomeNetEarnedAsOperatorsOfJointVenture" xlink:label="loc_gau_ServiceFeeIncomeNetEarnedAsOperatorsOfJointVenture_19"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GainsLossesOnDerecognitionOfEquityInvestmentInJointVenture" xlink:label="loc_gau_GainsLossesOnDerecognitionOfEquityInvestmentInJointVenture_20"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_21"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ReversalOfImpairmentLoss" xlink:label="loc_ifrs-full_ReversalOfImpairmentLoss_22"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ImpairmentOfExplorationAndEvaluationAssets" xlink:label="loc_gau_ImpairmentOfExplorationAndEvaluationAssets_23"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:label="loc_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_24"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinanceIncome" xlink:label="loc_ifrs-full_FinanceIncome_25"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinanceCosts" xlink:label="loc_ifrs-full_FinanceCosts_26"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_27"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_28"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1" xlink:to="loc_ifrs-full_GeographicalAreasAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_1" xlink:to="loc_ifrs-full_GeographicalAreasDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_country_CA_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_country_GH_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_srt_AfricaMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_1" xlink:to="loc_ifrs-full_GeographicalAreasDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_Revenue_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_gau_CostOfSalesAbstract_9" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CostOfSalesAbstract_9" xlink:to="loc_gau_ProductionCost_9" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CostOfSalesAbstract_9" xlink:to="loc_ifrs-full_DepreciationExpense_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CostOfSalesAbstract_9" xlink:to="loc_ifrs-full_RoyaltyExpense_11" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_GrossProfit_13" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_14" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_gau_TerminationOfOfftakeAgreement_15" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_SellingGeneralAndAdministrativeExpense_16" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources_17" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_18" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_gau_ServiceFeeIncomeNetEarnedAsOperatorsOfJointVenture_19" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_gau_GainsLossesOnDerecognitionOfEquityInvestmentInJointVenture_20" order="100" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_21" order="110" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_ReversalOfImpairmentLoss_22" order="120" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_gau_ImpairmentOfExplorationAndEvaluationAssets_23" order="130" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_24" order="140" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_FinanceIncome_25" order="150" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_FinanceCosts_26" order="160" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_27" order="170" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_0" xlink:to="loc_ifrs-full_ComprehensiveIncome_28" order="180" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DisclosureDisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_ifrs-full_CurrencyRiskMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AmountsHeldInForeignCurrenciesAxis" xlink:label="loc_gau_AmountsHeldInForeignCurrenciesAxis_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AmountsHeldInForeignCurrenciesDomain" xlink:label="loc_gau_AmountsHeldInForeignCurrenciesDomain_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_CAD" xlink:label="loc_currency_CAD_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_GHS" xlink:label="loc_currency_GHS_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_ZAR" xlink:label="loc_currency_ZAR_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_XOF" xlink:label="loc_currency_XOF_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_USD" xlink:label="loc_currency_USD_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AmountsHeldInForeignCurrenciesDomain" xlink:label="loc_gau_AmountsHeldInForeignCurrenciesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="loc_ifrs-full_CashAndCashEquivalents_14"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherCurrentReceivables" xlink:label="loc_ifrs-full_OtherCurrentReceivables_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ValueAddedTaxReceivables" xlink:label="loc_ifrs-full_ValueAddedTaxReceivables_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TradeAndOtherCurrentPayables" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables_17"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LongTermIncentivePlanLiabilities" xlink:label="loc_gau_LongTermIncentivePlanLiabilities_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_LeaseLiabilities" xlink:label="loc_ifrs-full_LeaseLiabilities_19"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ValueAtRisk" xlink:label="loc_ifrs-full_ValueAtRisk_20"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_TypesOfRisksAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_1" xlink:to="loc_ifrs-full_TypesOfRisksDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_1" xlink:to="loc_ifrs-full_CurrencyRiskMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_1" xlink:to="loc_ifrs-full_TypesOfRisksDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_gau_AmountsHeldInForeignCurrenciesAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesAxis_5" xlink:to="loc_gau_AmountsHeldInForeignCurrenciesDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesDomain_5" xlink:to="loc_currency_CAD_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesDomain_5" xlink:to="loc_currency_GHS_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesDomain_5" xlink:to="loc_currency_ZAR_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesDomain_5" xlink:to="loc_currency_XOF_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesDomain_5" xlink:to="loc_currency_USD_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesAxis_5" xlink:to="loc_gau_AmountsHeldInForeignCurrenciesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_CashAndCashEquivalents_14" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_OtherCurrentReceivables_15" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_ValueAddedTaxReceivables_16" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_TradeAndOtherCurrentPayables_17" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_LongTermIncentivePlanLiabilities_18" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_LeaseLiabilities_19" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_ValueAtRisk_20" order="70" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/IncomeTaxNarrativeDetails">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfIncomeTaxLineItems" xlink:label="loc_gau_DisclosureOfIncomeTaxLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfIncomeTaxTable" xlink:label="loc_gau_DisclosureOfIncomeTaxTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_CA" xlink:label="loc_country_CA_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GhanaMember" xlink:label="loc_gau_GhanaMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:label="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures" xlink:label="loc_ifrs-full_TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_gau_DisclosureOfIncomeTaxTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_DisclosureOfIncomeTaxTable_1" xlink:to="loc_srt_StatementGeographicalAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_1" xlink:to="loc_srt_SegmentGeographicalDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1" xlink:to="loc_country_CA_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1" xlink:to="loc_gau_GhanaMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_1" xlink:to="loc_srt_SegmentGeographicalDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_7" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DisclosureOfIncomeTaxLineItems_0" xlink:to="loc_ifrs-full_TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures_8" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesDisclosureOfNumberRSUsDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RestrictedShareUnitsMember" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NumberOfUnitAssumedInAcquisition" xlink:label="loc_gau_NumberOfUnitAssumedInAcquisition_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NumberOfOtherEquityInstrumentsDerecognizedOnClosingOfJointVentureTransaction" xlink:label="loc_gau_NumberOfOtherEquityInstrumentsDerecognizedOnClosingOfJointVentureTransaction_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NumberOfOtherEquityInstrumentsSettledInCash" xlink:label="loc_gau_NumberOfOtherEquityInstrumentsSettledInCash_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_12"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_NumberOfUnitAssumedInAcquisition_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_NumberOfOtherEquityInstrumentsDerecognizedOnClosingOfJointVentureTransaction_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_NumberOfOtherEquityInstrumentsSettledInCash_10" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_11" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_12" order="70" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesDisclosureOfMovementInRSULiabilityDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RestrictedShareUnitsMember" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitLiability" xlink:label="loc_gau_RestrictedStockUnitLiability_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitLiabilityAssumedInAcquisition" xlink:label="loc_gau_RestrictedStockUnitLiabilityAssumedInAcquisition_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitAwardsVestedDuringYearNetOfCancelledExpiredAwards" xlink:label="loc_gau_RestrictedStockUnitAwardsVestedDuringYearNetOfCancelledExpiredAwards_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitLiabilitySettledInCash" xlink:label="loc_gau_RestrictedStockUnitLiabilitySettledInCash_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitLiabilityDerecognizedOnClosingJointVentureTransaction" xlink:label="loc_gau_RestrictedStockUnitLiabilityDerecognizedOnClosingJointVentureTransaction_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitLiabilityCurrent" xlink:label="loc_gau_RestrictedStockUnitLiabilityCurrent_11"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RsuLiabilityNoncurrent" xlink:label="loc_gau_RsuLiabilityNoncurrent_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RestrictedStockUnitLiabilityNoncurrent" xlink:label="loc_gau_RestrictedStockUnitLiabilityNoncurrent_13"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitLiability_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitLiabilityAssumedInAcquisition_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitAwardsVestedDuringYearNetOfCancelledExpiredAwards_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitLiabilitySettledInCash_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitLiabilityDerecognizedOnClosingJointVentureTransaction_10" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitLiabilityCurrent_11" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RsuLiabilityNoncurrent_12" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_RestrictedStockUnitLiabilityNoncurrent_13" order="80" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfReconciliationOfTheMovementInPSUsDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitsMember" xlink:label="loc_gau_PerformanceShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NumberOfOtherEquityInstrumentsAddedShareBasedPaymentArrangement" xlink:label="loc_gau_NumberOfOtherEquityInstrumentsAddedShareBasedPaymentArrangement_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_10"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_PerformanceShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_NumberOfOtherEquityInstrumentsAddedShareBasedPaymentArrangement_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_10" order="50" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfReconciliationOfTheMovementInDSUsDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitsMember" xlink:label="loc_gau_DeferredShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_DeferredShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_9" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInPSUsLiabilityDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitsMember" xlink:label="loc_gau_PerformanceShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitsLiability" xlink:label="loc_gau_PerformanceShareUnitsLiability_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards" xlink:label="loc_gau_PerformanceShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitsLiabilitySettledInCash" xlink:label="loc_gau_PerformanceShareUnitsLiabilitySettledInCash_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitLiabilityCurrent" xlink:label="loc_gau_PerformanceShareUnitLiabilityCurrent_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PerformanceShareUnitLiabilityNoncurrent" xlink:label="loc_gau_PerformanceShareUnitLiabilityNoncurrent_10"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_PerformanceShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PerformanceShareUnitsLiability_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PerformanceShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PerformanceShareUnitsLiabilitySettledInCash_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PerformanceShareUnitLiabilityCurrent_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PerformanceShareUnitLiabilityNoncurrent_10" order="50" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInDSUsLiabilityDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitsMember" xlink:label="loc_gau_DeferredShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitsLiability" xlink:label="loc_gau_DeferredShareUnitsLiability_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards" xlink:label="loc_gau_DeferredShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredShareUnitLiabilitySettledInCash" xlink:label="loc_gau_DeferredShareUnitLiabilitySettledInCash_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_DeferredShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_DeferredShareUnitsLiability_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_DeferredShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_DeferredShareUnitLiabilitySettledInCash_8" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/EquityReservesAndLongtermIncentivePlanAwardsDisclosureOfMovementInPhantomShareUnitLiabilityDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfReservesWithinEquityTable" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsAxis" xlink:label="loc_gau_EquityTransactionsAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PhantomShareUnitsMember" xlink:label="loc_gau_PhantomShareUnitsMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EquityTransactionsDomain" xlink:label="loc_gau_EquityTransactionsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PhantomShareUnitsLiability" xlink:label="loc_gau_PhantomShareUnitsLiability_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PhantomShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards" xlink:label="loc_gau_PhantomShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards_7"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityTable_1" xlink:to="loc_gau_EquityTransactionsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_EquityTransactionsDomain_1" xlink:to="loc_gau_PhantomShareUnitsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_EquityTransactionsAxis_1" xlink:to="loc_gau_EquityTransactionsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PhantomShareUnitsLiability_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems_0" xlink:to="loc_gau_PhantomShareUnitsAwardsVestedDuringYearNetOfCancelledExpiredAwards_7" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/FinancialInstrumentsDisclosureOfDetailedInformationAboutFinancialInstrumentsByCategoryDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FinancialLiabilitiesCarryingValueMember" xlink:label="loc_gau_FinancialLiabilitiesCarryingValueMember_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueMember" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueMember_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_15"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_16"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FinancialAssetsCarryingValueMember" xlink:label="loc_gau_FinancialAssetsCarryingValueMember_17"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAbstract" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="loc_ifrs-full_CashAndCashEquivalents_22"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherReceivables" xlink:label="loc_ifrs-full_OtherReceivables_23"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialAssetsAvailableforsale" xlink:label="loc_ifrs-full_FinancialAssetsAvailableforsale_24"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PreferredSharesInJointVentureValue" xlink:label="loc_gau_PreferredSharesInJointVentureValue_25"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialAssets" xlink:label="loc_ifrs-full_FinancialAssets_26"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TradeAndOtherPayables" xlink:label="loc_ifrs-full_TradeAndOtherPayables_28"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LongTermIncentivePlanLiabilities" xlink:label="loc_gau_LongTermIncentivePlanLiabilities_29"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_LeaseLiabilities" xlink:label="loc_ifrs-full_LeaseLiabilities_30"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsideration" xlink:label="loc_gau_DeferredConsideration_31"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ContingentConsideration" xlink:label="loc_gau_ContingentConsideration_32"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranRoyaltyPayable" xlink:label="loc_gau_NkranRoyaltyPayable_33"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_OtherNoncurrentLiabilities" xlink:label="loc_ifrs-full_OtherNoncurrentLiabilities_34"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilities" xlink:label="loc_ifrs-full_FinancialLiabilities_35"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5" xlink:to="loc_gau_FinancialLiabilitiesCarryingValueMember_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_11" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_11" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_11" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_11" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueMember_11" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_11" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_15" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_15" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_15" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_15" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_15" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_15" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_16" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_15" xlink:to="loc_gau_FinancialAssetsCarryingValueMember_17" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_15" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22" xlink:to="loc_ifrs-full_CashAndCashEquivalents_22" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22" xlink:to="loc_ifrs-full_OtherReceivables_23" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22" xlink:to="loc_ifrs-full_FinancialAssetsAvailableforsale_24" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22" xlink:to="loc_gau_PreferredSharesInJointVentureValue_25" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAbstract_22" xlink:to="loc_ifrs-full_FinancialAssets_26" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_ifrs-full_TradeAndOtherPayables_28" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_gau_LongTermIncentivePlanLiabilities_29" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_ifrs-full_LeaseLiabilities_30" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_gau_DeferredConsideration_31" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_gau_ContingentConsideration_32" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_gau_NkranRoyaltyPayable_33" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_ifrs-full_OtherNoncurrentLiabilities_34" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract_28" xlink:to="loc_ifrs-full_FinancialLiabilities_35" order="70" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/AcquisitionOfControlOfTheAGMDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GoldFieldsLimitedMember" xlink:label="loc_gau_GoldFieldsLimitedMember_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashTransferred" xlink:label="loc_ifrs-full_CashTransferred_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_EquityInterestsOfAcquirer" xlink:label="loc_ifrs-full_EquityInterestsOfAcquirer_11"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsideration" xlink:label="loc_gau_DeferredConsideration_12"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate_13"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranRoyaltyRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_NkranRoyaltyRecognisedAsOfAcquisitionDate_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueOfConsiderationPaid" xlink:label="loc_gau_FairValueOfConsiderationPaid_15"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueOfEquityInterestsPreviouslyHeld" xlink:label="loc_gau_FairValueOfEquityInterestsPreviouslyHeld_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_17"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_ifrs-full_JointVenturesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_5" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_GoldFieldsLimitedMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_5" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_CashTransferred_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_EquityInterestsOfAcquirer_11" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DeferredConsideration_12" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate_13" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_NkranRoyaltyRecognisedAsOfAcquisitionDate_14" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_FairValueOfConsiderationPaid_15" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_FairValueOfEquityInterestsPreviouslyHeld_16" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_17" order="80" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/AcquisitionOfControlOfTheAGMDetails1">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GoldFieldsLimitedMember" xlink:label="loc_gau_GoldFieldsLimitedMember_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AssetsAcquiredAbstract" xlink:label="loc_gau_AssetsAcquiredAbstract_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AccountsReceivableRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_AccountsReceivableRecognisedAsOfAcquisitionDate_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_InventoryRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_InventoryRecognisedAsOfAcquisitionDate_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ValueAddedTaxReceivablesRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_ValueAddedTaxReceivablesRecognisedAsOfAcquisitionDate_13"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PrepaidExpensesAndOtherRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_PrepaidExpensesAndOtherRecognisedAsOfAcquisitionDate_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ReclamationDepositsRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_ReclamationDepositsRecognisedAsOfAcquisitionDate_15"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MineralPropertiesPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_MineralPropertiesPlantAndEquipmentRecognisedAsOfAcquisitionDate_16"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LiabilitiesAssumedAbstract" xlink:label="loc_gau_LiabilitiesAssumedAbstract_18"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_18"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LeaseLiabilitiesRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_LeaseLiabilitiesRecognisedAsOfAcquisitionDate_19"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AssetRetirementProvisionsRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_AssetRetirementProvisionsRecognisedAsOfAcquisitionDate_20"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NetAssetsAcquiredRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_NetAssetsAcquiredRecognisedAsOfAcquisitionDate_22"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate" xlink:label="loc_ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate_23"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_24"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_ifrs-full_JointVenturesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_5" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_GoldFieldsLimitedMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_5" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_AssetsAcquiredAbstract_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_10" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_gau_AccountsReceivableRecognisedAsOfAcquisitionDate_11" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_ifrs-full_InventoryRecognisedAsOfAcquisitionDate_12" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_gau_ValueAddedTaxReceivablesRecognisedAsOfAcquisitionDate_13" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_gau_PrepaidExpensesAndOtherRecognisedAsOfAcquisitionDate_14" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_gau_ReclamationDepositsRecognisedAsOfAcquisitionDate_15" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AssetsAcquiredAbstract_10" xlink:to="loc_gau_MineralPropertiesPlantAndEquipmentRecognisedAsOfAcquisitionDate_16" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_LiabilitiesAssumedAbstract_18" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_LiabilitiesAssumedAbstract_18" xlink:to="loc_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_18" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_LiabilitiesAssumedAbstract_18" xlink:to="loc_gau_LeaseLiabilitiesRecognisedAsOfAcquisitionDate_19" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_LiabilitiesAssumedAbstract_18" xlink:to="loc_gau_AssetRetirementProvisionsRecognisedAsOfAcquisitionDate_20" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_NetAssetsAcquiredRecognisedAsOfAcquisitionDate_22" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate_23" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_24" order="50" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/AcquisitionOfControlOfTheAGMNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_5"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GoldFieldsLimitedMember" xlink:label="loc_gau_GoldFieldsLimitedMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineMember" xlink:label="loc_gau_AsankoGoldMineMember_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldGhanaLtdAgglMember" xlink:label="loc_gau_AsankoGoldGhanaLtdAgglMember_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AdansiGoldCompanyGhLtdMember" xlink:label="loc_gau_AdansiGoldCompanyGhLtdMember_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ShikaGroupFinanceLimitedMember" xlink:label="loc_gau_ShikaGroupFinanceLimitedMember_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GfiNetherlandsBvMember" xlink:label="loc_gau_GfiNetherlandsBvMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationInstallmentAxis" xlink:label="loc_gau_DeferredConsiderationInstallmentAxis_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationInstallmentDomain" xlink:label="loc_gau_DeferredConsiderationInstallmentDomain_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FirstInstallmentMember" xlink:label="loc_gau_FirstInstallmentMember_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_SecondInstallmentMember" xlink:label="loc_gau_SecondInstallmentMember_15"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationInstallmentDomain" xlink:label="loc_gau_DeferredConsiderationInstallmentDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_20"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_21"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_22"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashTransferred" xlink:label="loc_ifrs-full_CashTransferred_23"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable" xlink:label="loc_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_24"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderations" xlink:label="loc_gau_DeferredConsiderations_25"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfDeferredConsideration" xlink:label="loc_gau_DescriptionOfDeferredConsideration_26"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ContingentsConsiderationRecognisedAsOfAcquisitionDate" xlink:label="loc_gau_ContingentsConsiderationRecognisedAsOfAcquisitionDate_27"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NetSmelterReturnRoyalty" xlink:label="loc_gau_NetSmelterReturnRoyalty_28"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ContingentConsiderationUponProductionOfGold" xlink:label="loc_gau_ContingentConsiderationUponProductionOfGold_29"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MaximumProductionOfGold" xlink:label="loc_gau_MaximumProductionOfGold_30"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfRoyaltyOnProduction" xlink:label="loc_gau_DescriptionOfRoyaltyOnProduction_31"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfDeferredConsiderationPaymentTerms" xlink:label="loc_gau_DescriptionOfDeferredConsiderationPaymentTerms_32"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfFairValueDeterminationForCommonSharesIssuedAsConsideration" xlink:label="loc_gau_DescriptionOfFairValueDeterminationForCommonSharesIssuedAsConsideration_33"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfFairValueDeterminationForDeferredConsideration" xlink:label="loc_gau_DescriptionOfFairValueDeterminationForDeferredConsideration_34"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfFairValueDeterminationForContingentConsideration" xlink:label="loc_gau_DescriptionOfFairValueDeterminationForContingentConsideration_35"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DescriptionOfFairValueDeterminationForNkranRoyalty" xlink:label="loc_gau_DescriptionOfFairValueDeterminationForNkranRoyalty_36"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueOfPreferredShares" xlink:label="loc_gau_FairValueOfPreferredShares_37"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FairValueOfCompanysPreviousEquityInvestment" xlink:label="loc_gau_FairValueOfCompanysPreviousEquityInvestment_38"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:label="loc_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_39"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RevenueFromAssetsAcquired" xlink:label="loc_gau_RevenueFromAssetsAcquired_40"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NetIncomeFromAssetsAcquired" xlink:label="loc_gau_NetIncomeFromAssetsAcquired_41"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_42"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_43"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_ifrs-full_JointVenturesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_5" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_GoldFieldsLimitedMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_AsankoGoldMineMember_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_AsankoGoldGhanaLtdAgglMember_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_AdansiGoldCompanyGhLtdMember_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_ShikaGroupFinanceLimitedMember_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_5" xlink:to="loc_gau_GfiNetherlandsBvMember_10" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_5" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_1" xlink:to="loc_gau_DeferredConsiderationInstallmentAxis_14" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_DeferredConsiderationInstallmentAxis_14" xlink:to="loc_gau_DeferredConsiderationInstallmentDomain_14" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DeferredConsiderationInstallmentDomain_14" xlink:to="loc_gau_FirstInstallmentMember_14" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_DeferredConsiderationInstallmentDomain_14" xlink:to="loc_gau_SecondInstallmentMember_15" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_DeferredConsiderationInstallmentAxis_14" xlink:to="loc_gau_DeferredConsiderationInstallmentDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_20" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_21" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_22" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_CashTransferred_23" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_24" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DeferredConsiderations_25" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfDeferredConsideration_26" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_ContingentsConsiderationRecognisedAsOfAcquisitionDate_27" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_NetSmelterReturnRoyalty_28" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_ContingentConsiderationUponProductionOfGold_29" order="100" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_MaximumProductionOfGold_30" order="110" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfRoyaltyOnProduction_31" order="120" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfDeferredConsiderationPaymentTerms_32" order="130" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfFairValueDeterminationForCommonSharesIssuedAsConsideration_33" order="140" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfFairValueDeterminationForDeferredConsideration_34" order="150" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfFairValueDeterminationForContingentConsideration_35" order="160" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_DescriptionOfFairValueDeterminationForNkranRoyalty_36" order="170" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_FairValueOfPreferredShares_37" order="180" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_FairValueOfCompanysPreviousEquityInvestment_38" order="190" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_39" order="200" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_RevenueFromAssetsAcquired_40" order="210" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_gau_NetIncomeFromAssetsAcquired_41" order="220" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_Revenue_42" order="230" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_0" xlink:to="loc_ifrs-full_ProfitLoss_43" order="240" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DeferredAndContingentConsiderationDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationMember" xlink:label="loc_gau_DeferredConsiderationMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ContingentConsiderationMember" xlink:label="loc_ifrs-full_ContingentConsiderationMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranRoyaltyMember" xlink:label="loc_gau_NkranRoyaltyMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredAndContingentConsideration" xlink:label="loc_gau_DeferredAndContingentConsideration_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CurrentPortionOfDeferredConsideration" xlink:label="loc_gau_CurrentPortionOfDeferredConsideration_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NonCurrentPortionOfDeferredAndContingentConsideration" xlink:label="loc_gau_NonCurrentPortionOfDeferredAndContingentConsideration_10"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_DeferredConsiderationMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_ifrs-full_ContingentConsiderationMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_NkranRoyaltyMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DeferredAndContingentConsideration_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_CurrentPortionOfDeferredConsideration_9" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_NonCurrentPortionOfDeferredAndContingentConsideration_10" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DeferredAndContingentConsiderationDetails1">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationMember" xlink:label="loc_gau_DeferredConsiderationMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ContingentConsiderationMember" xlink:label="loc_ifrs-full_ContingentConsiderationMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranRoyaltyMember" xlink:label="loc_gau_NkranRoyaltyMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredAndContingentConsideration" xlink:label="loc_gau_DeferredAndContingentConsideration_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredAndContingentConsiderationInitialRecognitionAtFairValue" xlink:label="loc_gau_DeferredAndContingentConsiderationInitialRecognitionAtFairValue_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AccretionExpenseDeferredAndContingentConsideration" xlink:label="loc_gau_AccretionExpenseDeferredAndContingentConsideration_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOfConsideration" xlink:label="loc_gau_ChangeInFairValueOfConsideration_11"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_DeferredConsiderationMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_ifrs-full_ContingentConsiderationMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_NkranRoyaltyMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DeferredAndContingentConsideration_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DeferredAndContingentConsiderationInitialRecognitionAtFairValue_9" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_AccretionExpenseDeferredAndContingentConsideration_10" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_ChangeInFairValueOfConsideration_11" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DeferredAndContingentConsiderationNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationMember" xlink:label="loc_gau_DeferredConsiderationMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ContingentConsiderationMember" xlink:label="loc_ifrs-full_ContingentConsiderationMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranRoyaltyMember" xlink:label="loc_gau_NkranRoyaltyMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeDomain" xlink:label="loc_ifrs-full_RangeDomain_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RangeDomain" xlink:label="loc_ifrs-full_RangeDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AggregateConsiderationPayable" xlink:label="loc_gau_AggregateConsiderationPayable_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AggregateConsiderationPayableInYearOne" xlink:label="loc_gau_AggregateConsiderationPayableInYearOne_13"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AggregateConsiderationPayableInYearTwo" xlink:label="loc_gau_AggregateConsiderationPayableInYearTwo_14"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NetSmelterReturnRoyalty" xlink:label="loc_gau_NetSmelterReturnRoyalty_15"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ContingentConsiderationUponProductionOfGold" xlink:label="loc_gau_ContingentConsiderationUponProductionOfGold_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:label="loc_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections_17"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredAndContingentConsiderationFairValueAtInitialRecognition" xlink:label="loc_gau_DeferredAndContingentConsiderationFairValueAtInitialRecognition_18"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AccretionExpenseDeferredAndContingentConsideration" xlink:label="loc_gau_AccretionExpenseDeferredAndContingentConsideration_19"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_FutureRoyaltyPaymentsOfLongTermConsensusPrices" xlink:label="loc_gau_FutureRoyaltyPaymentsOfLongTermConsensusPrices_20"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredAndContingentConsideration" xlink:label="loc_gau_DeferredAndContingentConsideration_21"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOfConsideration" xlink:label="loc_gau_ChangeInFairValueOfConsideration_22"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_LongTermConsensusPrices" xlink:label="loc_gau_LongTermConsensusPrices_23"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_DeferredConsiderationMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_ifrs-full_ContingentConsiderationMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_NkranRoyaltyMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" xlink:to="loc_ifrs-full_RangeAxis_7" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_7" xlink:to="loc_ifrs-full_RangeDomain_7" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_7" xlink:to="loc_ifrs-full_TopOfRangeMember_7" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_7" xlink:to="loc_ifrs-full_RangeDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_AggregateConsiderationPayable_12" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_AggregateConsiderationPayableInYearOne_13" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_AggregateConsiderationPayableInYearTwo_14" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_NetSmelterReturnRoyalty_15" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_ContingentConsiderationUponProductionOfGold_16" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections_17" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DeferredAndContingentConsiderationFairValueAtInitialRecognition_18" order="70" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_AccretionExpenseDeferredAndContingentConsideration_19" order="80" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_FutureRoyaltyPaymentsOfLongTermConsensusPrices_20" order="90" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DeferredAndContingentConsideration_21" order="100" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_ChangeInFairValueOfConsideration_22" order="110" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_LongTermConsensusPrices_23" order="120" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/DeferredAndContingentConsiderationTables">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DeferredConsiderationMember" xlink:label="loc_gau_DeferredConsiderationMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ContingentConsiderationMember" xlink:label="loc_ifrs-full_ContingentConsiderationMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranRoyaltyMember" xlink:label="loc_gau_NkranRoyaltyMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfDetailedInformationAboutDeferredAndContingentConsiderationExplanatory" xlink:label="loc_gau_DisclosureOfDetailedInformationAboutDeferredAndContingentConsiderationExplanatory_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_DisclosureOfCarryingAmountOfConsiderationExplanatory" xlink:label="loc_gau_DisclosureOfCarryingAmountOfConsiderationExplanatory_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_DeferredConsiderationMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_ifrs-full_ContingentConsiderationMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_1" xlink:to="loc_gau_NkranRoyaltyMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_1" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DisclosureOfDetailedInformationAboutDeferredAndContingentConsiderationExplanatory_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_0" xlink:to="loc_gau_DisclosureOfCarryingAmountOfConsiderationExplanatory_9" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/FinancialInstrumentsDisclosureOfDetailedInformationAboutLossesOnDerivativesDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AmountsHeldInForeignCurrenciesAxis" xlink:label="loc_gau_AmountsHeldInForeignCurrenciesAxis_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AmountsHeldInForeignCurrenciesDomain" xlink:label="loc_gau_AmountsHeldInForeignCurrenciesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AmountsHeldInForeignCurrenciesDomain" xlink:label="loc_gau_AmountsHeldInForeignCurrenciesDomain_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_4"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RealizedLossesOnZccGoldHedges" xlink:label="loc_gau_RealizedLossesOnZccGoldHedges_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_UnrealizedLossesOnZccGoldHedges" xlink:label="loc_gau_UnrealizedLossesOnZccGoldHedges_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_gau_AmountsHeldInForeignCurrenciesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesAxis_1" xlink:to="loc_gau_AmountsHeldInForeignCurrenciesDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_AmountsHeldInForeignCurrenciesAxis_1" xlink:to="loc_gau_AmountsHeldInForeignCurrenciesDomain_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_TypesOfRisksAxis_4" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_4" xlink:to="loc_ifrs-full_TypesOfRisksDomain_Default" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_4" xlink:to="loc_ifrs-full_TypesOfRisksDomain_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_RealizedLossesOnZccGoldHedges_8" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_UnrealizedLossesOnZccGoldHedges_9" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/FinancialInstrumentsDisclosureOfDetailedInformationAboutSensitivityFairValuesOfFinancialLiabilitiesUnderlyingDiscountRateDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOnePercentageIncreaseToDiscountRateMember" xlink:label="loc_gau_ChangeInFairValueOnePercentageIncreaseToDiscountRateMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOnePercentageDecreaseToDiscountRateMember" xlink:label="loc_gau_ChangeInFairValueOnePercentageDecreaseToDiscountRateMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="loc_ifrs-full_TypesOfRisksDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOfContingentConsiderationDueToIncreaseInInterestRate" xlink:label="loc_gau_ChangeInFairValueOfContingentConsiderationDueToIncreaseInInterestRate_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOfContingentConsiderationDueToDecreaseInInterestRate" xlink:label="loc_gau_ChangeInFairValueOfContingentConsiderationDueToDecreaseInInterestRate_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOfNkranRoyaltyDueToIncreaseInInterestRate" xlink:label="loc_gau_ChangeInFairValueOfNkranRoyaltyDueToIncreaseInInterestRate_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInFairValueOfNkranRoyaltyDueToDecreaseInInterestRate" xlink:label="loc_gau_ChangeInFairValueOfNkranRoyaltyDueToDecreaseInInterestRate_10"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_1" xlink:to="loc_ifrs-full_TypesOfRisksAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_1" xlink:to="loc_ifrs-full_TypesOfRisksDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_1" xlink:to="loc_gau_ChangeInFairValueOnePercentageIncreaseToDiscountRateMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_1" xlink:to="loc_gau_ChangeInFairValueOnePercentageDecreaseToDiscountRateMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_1" xlink:to="loc_ifrs-full_TypesOfRisksDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_ChangeInFairValueOfContingentConsiderationDueToIncreaseInInterestRate_7" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_ChangeInFairValueOfContingentConsiderationDueToDecreaseInInterestRate_8" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_ChangeInFairValueOfNkranRoyaltyDueToIncreaseInInterestRate_9" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_0" xlink:to="loc_gau_ChangeInFairValueOfNkranRoyaltyDueToDecreaseInInterestRate_10" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/BasisOfPresentationDisclosureOfSubsidiariesNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldGhanaLimitedMember" xlink:label="loc_gau_AsankoGoldGhanaLimitedMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AdansiGoldCompanyGhanaLimitedMember" xlink:label="loc_gau_AdansiGoldCompanyGhanaLimitedMember_2"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ShikaGroupFinanceLimitedMember" xlink:label="loc_gau_ShikaGroupFinanceLimitedMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AsankoGoldGhanaLimitedMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AdansiGoldCompanyGhanaLimitedMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_ShikaGroupFinanceLimitedMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_8" order="10" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/ShareCapitalDisclosureOfIssuedAndOutstandingCommonSharesDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IssuedCapitalMember" xlink:label="loc_ifrs-full_IssuedCapitalMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCostsShares" xlink:label="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCostsShares_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCosts" xlink:label="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCosts_9"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_IncreaseDecreaseThroughExerciseOfOptionsShares" xlink:label="loc_gau_IncreaseDecreaseThroughExerciseOfOptionsShares_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_11"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_1" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_1" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_1" xlink:to="loc_ifrs-full_IssuedCapitalMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_1" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_ifrs-full_Equity_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCostsShares_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughBusinessCombinationNetOfShareIssuanceCosts_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_gau_IncreaseDecreaseThroughExerciseOfOptionsShares_10" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_11" order="60" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/NoncontrollingInterestNCINarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldGhanaLimitedMember" xlink:label="loc_gau_AsankoGoldGhanaLimitedMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_6"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ProportionOfDividendsPaidToNonControllingInterests" xlink:label="loc_gau_ProportionOfDividendsPaidToNonControllingInterests_7"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_8"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:to="loc_gau_AsankoGoldGhanaLimitedMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_gau_ProportionOfDividendsPaidToNonControllingInterests_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_0" xlink:to="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_8" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/JVServiceFeeNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesLineItems" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfJointVenturesTable" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldMineJointVentureMember" xlink:label="loc_gau_AsankoGoldMineJointVentureMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_JointVenturesDomain" xlink:label="loc_ifrs-full_JointVenturesDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GrossServiceFeeFromJointVenture" xlink:label="loc_gau_GrossServiceFeeFromJointVenture_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PayablesOnSocialSecurityAndTaxesOtherThanIncomeTax" xlink:label="loc_ifrs-full_PayablesOnSocialSecurityAndTaxesOtherThanIncomeTax_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ServiceFeeIncomeNetEarnedAsOperatorsOfJointVenture" xlink:label="loc_gau_ServiceFeeIncomeNetEarnedAsOperatorsOfJointVenture_8"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_9"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AmountsPayableRelatedPartyTransactions" xlink:label="loc_ifrs-full_AmountsPayableRelatedPartyTransactions_10"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesTable_1" xlink:to="loc_ifrs-full_JointVenturesAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_1" xlink:to="loc_gau_AsankoGoldMineJointVentureMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_1" xlink:to="loc_ifrs-full_JointVenturesDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_GrossServiceFeeFromJointVenture_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_PayablesOnSocialSecurityAndTaxesOtherThanIncomeTax_7" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_gau_ServiceFeeIncomeNetEarnedAsOperatorsOfJointVenture_8" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_9" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfJointVenturesLineItems_0" xlink:to="loc_ifrs-full_AmountsPayableRelatedPartyTransactions_10" order="50" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/RevenueNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AsankoGoldGhanaLtdAgglMember" xlink:label="loc_gau_AsankoGoldGhanaLtdAgglMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AgreementAxis" xlink:label="loc_gau_AgreementAxis_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AgreementDomain" xlink:label="loc_gau_AgreementDomain_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RkMineFinanceMasterFundOneLimitedMember" xlink:label="loc_gau_RkMineFinanceMasterFundOneLimitedMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AgreementDomain" xlink:label="loc_gau_AgreementDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PercentageSellingOfFutureGoldProduction" xlink:label="loc_gau_PercentageSellingOfFutureGoldProduction_10"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MaximumFutureGoldProduction" xlink:label="loc_gau_MaximumFutureGoldProduction_11"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_PaymentForTerminatingOfftakeAgreement" xlink:label="loc_gau_PaymentForTerminatingOfftakeAgreement_12"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_RevenueFromSaleOfByProductSilverSales" xlink:label="loc_gau_RevenueFromSaleOfByProductSilverSales_13"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_1" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_1" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_1" xlink:to="loc_gau_AsankoGoldGhanaLtdAgglMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_1" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_1" xlink:to="loc_gau_AgreementAxis_5" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_gau_AgreementAxis_5" xlink:to="loc_gau_AgreementDomain_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_AgreementDomain_5" xlink:to="loc_gau_RkMineFinanceMasterFundOneLimitedMember_5" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_gau_AgreementAxis_5" xlink:to="loc_gau_AgreementDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_0" xlink:to="loc_gau_PercentageSellingOfFutureGoldProduction_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_0" xlink:to="loc_gau_MaximumFutureGoldProduction_11" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_0" xlink:to="loc_gau_PaymentForTerminatingOfftakeAgreement_12" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_0" xlink:to="loc_gau_RevenueFromSaleOfByProductSilverSales_13" order="40" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/RoyaltiesNarrativeDetails">
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CategoriesOfRoyaltyLineItems" xlink:label="loc_gau_CategoriesOfRoyaltyLineItems_0"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CategoriesOfRoyaltyTable" xlink:label="loc_gau_CategoriesOfRoyaltyTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="loc_ifrs-full_GeographicalAreasAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="loc_ifrs-full_GeographicalAreasDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_NkranMember" xlink:label="loc_gau_NkranMember_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_EsaaseMember" xlink:label="loc_gau_EsaaseMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="loc_ifrs-full_GeographicalAreasDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GrossRevenueRoyaltyPayableAsPercentage" xlink:label="loc_gau_GrossRevenueRoyaltyPayableAsPercentage_7"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AdditionalNetSmelterReturnRoyaltyPayableAsPercentage" xlink:label="loc_gau_AdditionalNetSmelterReturnRoyaltyPayableAsPercentage_8"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_GrowthAndSustainabilityLevy" xlink:label="loc_gau_GrowthAndSustainabilityLevy_9"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_gau_CategoriesOfRoyaltyLineItems_0" xlink:to="loc_gau_CategoriesOfRoyaltyTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_gau_CategoriesOfRoyaltyTable_1" xlink:to="loc_ifrs-full_GeographicalAreasAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_1" xlink:to="loc_ifrs-full_GeographicalAreasDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_gau_NkranMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_1" xlink:to="loc_gau_EsaaseMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_1" xlink:to="loc_ifrs-full_GeographicalAreasDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CategoriesOfRoyaltyLineItems_0" xlink:to="loc_gau_GrossRevenueRoyaltyPayableAsPercentage_7" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CategoriesOfRoyaltyLineItems_0" xlink:to="loc_gau_AdditionalNetSmelterReturnRoyaltyPayableAsPercentage_8" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_gau_CategoriesOfRoyaltyLineItems_0" xlink:to="loc_gau_GrowthAndSustainabilityLevy_9" order="30" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/MINERALPROPERTIESPLANTANDEQUIPMENTNarrativeDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfAssetsAxis" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfAssetsDomain" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MineralInterestsMember" xlink:label="loc_gau_MineralInterestsMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfAssetsDomain" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CapitalizedStrippingCostsAtAborePit" xlink:label="loc_gau_CapitalizedStrippingCostsAtAborePit_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DepreciationExpense" xlink:label="loc_ifrs-full_DepreciationExpense_7"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_1" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_gau_MineralInterestsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_1" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_gau_CapitalizedStrippingCostsAtAborePit_6" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_DepreciationExpense_7" order="20" use="optional"/>
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://www.asanko.com/role/MineralPropertiesPlantAndEquipmentDisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentDetails">
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfAssetsAxis" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfAssetsDomain" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_1"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_MineralInterestsMember" xlink:label="loc_gau_MineralInterestsMember_1"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ExplorationAndEvaluationAssetsMember" xlink:label="loc_ifrs-full_ExplorationAndEvaluationAssetsMember_2"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_3"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_RightofuseAssetsMember" xlink:label="loc_ifrs-full_RightofuseAssetsMember_4"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_AssetsUnderConstructionMember" xlink:label="loc_gau_AssetsUnderConstructionMember_5"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_CorporateAssetsMember" xlink:label="loc_gau_CorporateAssetsMember_6"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_ClassesOfAssetsDomain" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_10"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:label="loc_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_11"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_Default"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_16"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_17"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_18"/>
    <loc xlink:type="locator" xlink:href="gau-20241231.xsd#gau_ChangeInAssetRetirementProvisions" xlink:label="loc_gau_ChangeInAssetRetirementProvisions_19"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_20"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment_21"/>
    <loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_22"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" order="0" use="optional" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_1" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_gau_MineralInterestsMember_1" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_ifrs-full_ExplorationAndEvaluationAssetsMember_2" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_3" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_ifrs-full_RightofuseAssetsMember_4" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_gau_AssetsUnderConstructionMember_5" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_1" xlink:to="loc_gau_CorporateAssetsMember_6" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_1" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_1" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_10" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_10" xlink:to="loc_ifrs-full_CarryingAmountMember_10" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_10" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_10" order="0" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_10" xlink:to="loc_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_11" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_10" xlink:to="loc_ifrs-full_CarryingAmountMember_Default" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_16" order="10" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_17" order="20" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_18" order="30" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_gau_ChangeInAssetRetirementProvisions_19" order="40" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_20" order="50" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment_21" order="60" use="optional"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_0" xlink:to="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_22" order="70" use="optional"/>
  </definitionLink>
</linkbase>