Document and Entity Information [Abstract] Document and Entity Information [Abstract] Statements [Table] Statement [Table] Legal Entity [Axis] Statements [Line Items] Statement [Line Items] Document Type Amendment Flag Document Period End Date Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Emerging Growth Company Entity Ex Transition Period Entity Filer Category Entity Common Stock, Shares Outstanding Entity Current Reporting Status Document Fiscal Year Focus Document Fiscal Period Focus Statement of Financial Position Assets Current assets Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of year Receivables Current receivables due from related parties Receivable due from related party Prepaid expenses and deposits Prepaid expenses and deposits Total current assets Current assets Total current assets Non-current assets Non-current financial assets Financial assets Investments in joint ventures Interest in Joint Venture Total equity investment including cash investment Balance, beginning of year Balance, end of year Right-of-use assets Right-of-use asset Balance, beginning of year Balance, end of year Property, plant and equipment Mineral properties, plant and equipment Total non-current assets Non-current assets Total non-current assets Total assets Total assets Total assets Liabilities Current Liabilities Abstract Current liabilities Accounts payable and accrued liabilities Accounts payable and accrued liabilities Accounts payable and accrued liabilities Accounts payable and accrued liabilities Current lease liabilities Less: current lease liability Lease liability Less: current lease liability Current liabilities Current liabilities Total current liabilities Noncurrent Liabilities Abstract Non-current liabilities Long Term Incentive Plan Cash Settled Long-term incentive plan (cash-settled awards) Long-term incentive plan liability Amount of long-term incentive plan cash settled. Non-current lease liabilities Total non-current lease liability Lease liability Non-current liabilities Non-current liabilities Total non-current liabilities Total liabilities Total liabilities Total liabilities Equity Abstract Equity Share capital Equity reserves Accumulated deficit Accumulated deficit Equity Total equity Beginning Balance Ending Balance Total liabilities and equity Total liabilities and equity Income Statement Revenue Revenue Revenue recognized Revenues Cost Of Sales [Abstract] Cost of sales Cost of sales: Cost of sales Production Cost Total Production costs Production costs Production costs Production costs Total production costs Total production costs Depreciation and amortisation expense Depreciation and depletion expense Depreciation and depletion Depreciation and depletion Royalties Royalties Royalties Total cost of sales Total cost of sales Total cost of sales Total cost of sales Income from mine operations Income from mine operations Income (loss) from mine operations Income from mine operations Share of profit (loss) of joint ventures accounted for using equity method Share of net loss related to joint venture Company's share of net loss of the JV for the year Company's share of net loss of joint venture Company's share of net loss of the JV for the year Service Fee Income Net Earned As Operators Of Joint Venture Service fee earned as operators of joint venture Service fee earned as operators of joint venture Represent the amount of net service fees and income earned as operators of Joint venture. Exploration and evaluation expenditures Exploration and evaluation expenditures Exploration and evaluation expenditures General and administrative expenses Total General and administrative expenses General and administrative expenses Total Income from operations Income (Loss) from operations and joint venture Income from operations (Loss) income from operations and joint venture Gains (losses) recognised when control of subsidiary is lost Loss due to loss of control of subsidiaries Loss associated with loss of control of former Ghanaian subsidiaries Fair value adjustment associated with JV Transaction Loss associated with loss of control of former Ghanaian subsidiaries Loss associated with loss of control of former Ghanaian subsidiaries Loss due to loss of control of subsidiaries Finance expense Total Finance expense Total finance expense Finance expense Total finance expense Total finance expense Finance income Finance income Total finance income Foreign exchange gain (loss) Foreign exchange (loss) gain Foreign exchange loss Net loss before taxes Income (loss) before income taxes Income (loss) before income taxes Loss before income taxes Current income tax expenses Current tax expense Current income tax expense Current income tax expense Current income tax expense Deferred tax expense (income) Deferred tax expense Deferred income tax expense Deferred income tax expense Deferred income tax expense Net income (loss) and comprehensive income (loss) for the year Net loss and comprehensive loss for the year Net income (loss) and comprehensive income (loss) for the period Net loss and comprehensive loss for the year Net income (loss) attributable to: Net income (loss) attributable to: Common shareholders of the Company Common shareholders of the Company Common shareholders of the Company Net income (loss) attributable to common Non-controlling interest (ProfitLossAttributableToNoncontrollingInterests) Non-controlling interest Net earnings attributable to non-controlling interest Net loss after tax for the year Net loss for the period Net loss for the year Earnings (loss) per share attributable to common shareholders: Loss per share attributable to common shareholders: Basic (in dollars per share) Diluted (in dollars per share) Weighted average number of shares outstanding: Weighted average number of shares outstanding: Basic (WeightedAverageShares) Basic (in shares) Weighted average number of ordinary shares - basic Diluted (AdjustedWeightedAverageShares) Diluted (in shares) Weighted average number of ordinary shares - diluted Statement Of Changes In Equity [Abstract] Components of equity [Axis] Share capital [Member] Equity reserves [Member] Accumulated deficit [Member] Non-controlling interest [Member] Equity components [Domain] Beginning Balance (shares) Beginning Balance (shares) Ending Balance (shares) Exercise of share-based options Issued pursuant to exercise of share-based options Issuance of common shares on exercise of share-based options Increase Decrease Through Exercise Of Options Shares Issued pursuant to exercise of share-based options (shares) Issuance of common shares on exercise of share-based options (shares) Exercise of share-based options (shares) Shares Issued During Period Value For Private Placement Net Of Share Issuance Cost Issued pursuant to private placement, net of share issuance cost Issuance of common shares for private placement, net of share issuance costs Amount of share issued pursuant to private placement, net of share issuance cost. Shares Issued During Period Shares For Private Placement Net Of Share Issuance Cost Number of common shares issued for private placement Issued pursuant to private placement, net of share issuance cost (shares) Issuance of common shares for private placement, net of share issuance costs (shares) Number of shares issued to to private placement, net of share issuance cost. Share Based Payments Share-based payments Share-based payments Share-based payments Shares Repurchased And Cancelled Under Normal Course Issuer Bid Value Shares repurchased and cancelled under normal course issuer bid Value of shares repurchased and cancelled under normal course issuer bid. Shares repurchased and cancelled under normal course issuer bid Shares Repurchased And Cancelled Under Normal Course Issuer Bid Shares repurchased and cancelled under normal course issuer bid (shares) Number of shares repurchased and cancelled under normal course issuer bid. Shares repurchased and cancelled under normal course issuer bid (shares) Derecognition Of Non Controlling Interest On Loss Of Control Derecognition of non-controlling interest on loss of control Derecognition of non-controlling interest on loss of control Statement of Cash Flows Operating activities: Adjustments for: Adjustments for gain (loss) on disposal of investments in subsidiaries, joint ventures and associates Loss due to loss of control of subsidiaries Loss due to loss of control of subsidiaries Adjustments For Share Of Net Loss Related To Joint Venture Share of net loss related to joint venture Adjustments for gains (losses) on Share of net loss related to joint venture. Depreciation and depletion (AdjustmentsForDepreciationAndAmortisationExpense) Depreciation and depletion Share-based payments Interest and other income Interest and other income Finance expense (AdjustmentsForFinanceCosts) Finance expense Deferred income tax expense Unrealized foreign exchange loss (gain) Operating cash flow before working capital changes Change in non-cash working capital Operating cash flow before working capital changes Operating cash flow before working capital changes Change in non-cash working capital Cash provided by operating activities Net cash provided by operating activities after working capital changes Operating activities Cash provided by (used in) operating activities Investing activities: Expenditures on mineral properties, plant and equipment Expenditures on mineral properties, plant and equipment Other cash payments to acquire interests in joint ventures, classified as investing activities Gold Fields investment in joint venture Gold Fields investment in joint venture Other cash receipts from sales of interests in joint ventures, classified as investing activities Redemption of preferred shares in joint venture Gold Fields investment in joint venture Joint Venture Transaction Costs Paid Classified As Investing Activities Joint venture transaction costs paid The cash outflow for the Joint venture transaction costs paid. Joint venture transaction costs paid Cash And Cash Equivalents Derecognized On Loss Of Control Classified As Investing Activities Cash and cash equivalents derecognized on loss of control Represents cash and cash equivalents derecognized on loss of control classified as investing activities. Interest received Cash provided by (used for) investing activities Net cash used in investing activities Investing activities Cash provided by investing activities Financing activities: Shares issued for cash, net of share issuance costs Shares issued for cash under private placement, net of share issuance costs Proceeds from issuing shares Proceeds from exercise of options Shares issued for cash on exercise of share-based options Proceeds from exercise of options Payments to acquire or redeem entity's shares Shares repurchased under normal course issuer bid Shares repurchased under normal course issuer bid Payments of lease liabilities, classified as financing activities Lease payments made during the year Office lease payments Lease payments made during the year Office lease payments Repayments of non-current borrowings Repayment of long-term debt Repayment of long-term debt Interest and associated withholding tax paid Interest and associated withholding tax paid Interest and associated withholding tax paid Cash provided by (used for) financing activities Financing activities Net cash provided by (used in) financing activities Cash used in financing activities Impact of foreign exchange on cash and cash equivalents Impact of foreign exchange on cash and cash equivalents Increase (decrease) in cash and cash equivalents for the year Increase (decrease) in cash and cash equivalents during the year Increase (decrease) in cash and cash equivalents during the year Entity [Domain] Disclosure Of Nature Of Operations Explanatory Nature of operations [Text Block] Nature of operations [Text Block] Basis of presentation [Text Block] Significant accounting policies [Text Block] Changes in accounting standards [Text Block] Disclosure of transactions between related parties [abstract] Disclosure of transactions between related parties [text block] Receivable due from related party [Text Block] Significant accounting judgements and estimates [Text Block] Disclosure of joint ventures [abstract] Disclosure of joint ventures [text block] Joint venture transaction [Text Block] Revenue [abstract] Revenue [Text Block] Production costs by nature [Text Block] Selling, general and administrative expense [abstract] General and administrative expenses [Text Block] Disclosure Of Finance Income [Abstract] Disclosure of finance income [text block] Finance income [Text Block] Finance expense [Text Block] Income Tax [Abstract] Income Tax [Table] Income Tax [Line Items] Income tax [Text Block] Earnings Per Shares [Abstract] Earnings (loss) per share attributable to common shareholders [Text Block] Supplemental Cash Flows Information [Abstract] Supplemental cash flow information [Text Block] Disclosure of cash flows Disclosure of financial assets [abstract] Disclosure Of Financial Assets [Text Block] Financial assets [Text Block] Disclosure of reserves within equity [abstract] Disclosure of reserves within equity [text block] Equity reserves [Text Block] Disclosure of contingent liabilities [abstract] Disclosure of commitments and contingent liabilities [text block] Commitments and contingencies [Text Block] Investment In Joint Venture [Abstract] Investment in joint venture explanatory Investment In Joint Venture Explanatory [Text Block] Investment in joint venture [Text Block] The disclosure of investment in joint venture. Presentation of leases for lessee [abstract] Disclosure of leases [text block] Right-of-use asset and lease liability [Text Block] Segmented information [Text Block] Capital Management [Abstract] Capital management [Text Block] Disclosure of detailed information about financial instruments [abstract] Financial instruments [Text Block] Related party transactions [Text Block] Disclosure of non-adjusting events after reporting period [abstract] Disclosure of events after reporting period [text block] Subsequent event [Text Block] Disclosure of classes of share capital [abstract] Business combinations [Policy Text Block] Description of accounting policy for investments in joint ventures [text block] Investments in joint arrangements [Policy Text Block] Foreign currency translation [Policy Text Block] Cash and cash equivalents [Policy Text Block] Inventories [Policy Text Block] Mineral properties, plant and equipment [Policy Text Block] Description of accounting policy for leases [text block] Leases [Policy text block] Provisions General [Policy Text Block] Revenue from contracts with customers [Text Block] Revenue from contracts with customers [Policy Text Block] Description Of Accounting Policy For Royalties And Mining Taxes Explanatory Royalties and mining taxes [Policy Text Block] Description of Accounting Policy for Royalties and mining taxes Financial instruments [Policy Text Block] Share-based compensation [Policy Text Block] Income taxes [Policy Text Block] Income (loss) per share [Policy Text Block] Disclosure of subsidiaries [Table Text Block] Disclosure Of Detailed Information About Estimated Useful Life Or Depreciation Rate Explanatory Disclosure of detailed information about estimated useful life or depreciation rate [Table Text Block] Disclosure of detailed information about estimated useful life or depreciation rate [Table Text Block] Disclosure of associates [text block] Disclosure of recognized associates [Table Text Block] Disclosure Of Loss Associated With Loss Of Control Of Former Subsidiaries Explanatory Disclosure of loss associated with the loss of control of assets and liabilities [Table Text Block] Disclosure Of Loss Associated With Loss Of Control Of Former Subsidiaries Explanatory Disclosure of loss associated with joint venture. Disclosure of revenue from contracts with customers [text block] Disclosure of receivables from contracts with customers [Table Text Block] Disclosure of expenses by nature [Table Text Block] Disclosure Of Detailed Information About General And Administrative Expense Explanatory Disclosure of detailed information about general and administrative expense [Table Text Block] Disclosure of detailed information about general and administrative expense Disclosure Of Detailed Information About Finance Income Explanatory Disclosure of detailed information about finance income [Table Text Block] Information about finance income. Disclosure Of Detailed Information About Finance Expense Explanatory Disclosure of detailed information about finance expense [Table Text Block] Disclosure of detailed information about finance expense [Table Text Block]