Document and Entity Information [Abstract] Entity Addresses [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact Business Contact Entity Addresses [Line Items] Document Type Document Registration Statement Document Annual Report Document Period End Date Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Primary SIC Number Entity Tax Identification Number Contact Personnel Name Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Country Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Annual Information Form Audited Annual Financial Statements Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Interactive Data Current Entity Emerging Growth Company Entity Ex Transition Period ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction Entity Central Index Key Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Auditor Name Auditor Firm ID Auditor Location Consolidated Statements of Financial Position Assets Abstract ASSETS Current Assets Abstract Current assets Cash and cash equivalents Cash and cash equivalents at end of year Cash and cash equivalents at beginning of year Cash and cash equivalents Trade and other current receivables Receivables Receivables Current inventories Inventories Total Current investments Investments, end of year Investments, beginning of year Investments Total Investments Amount of prepaid expenses and deposits classified as current. Current Prepayments And Deposits Prepayments and deposits The amount of instruments representing indebtedness, including instruments called debt securities, held by the entity, classified as current. Debt Instruments Held, Current Secured notes Current assets Total current assets Non-current assets [abstract] Non-current assets Property, plant and equipment. Balance at the end of the year Balance at the beginning of the year Property, plant and equipment Assets arising from exploration for and evaluation of mineral resources Exploration and evaluation assets at end of the year Exploration and evaluation assets at beginning of the year Exploration and evaluation assets Goodwill Goodwill Investments in associates accounted for using equity method Investment in KLDC - ending Investment in KLDC - Beginning Investment in Kirkland Lake Discoveries Corp. Other non-current financial assets Other assets Assets Segment assets Total assets Total assets acquired Liabilities [abstract] Liabilities and Equity Current liabilities [abstract] Current liabilities The amount of trade accounts payable and accrued liabilities. Trade Accounts Payable And Accrued Liabilities Accounts payable and accrued liabilities The amount of flow-through share premium classified as current. Flow-Through Share Premium Liability, Current Flow-through share premium Other current liabilities. Other current liabilities Other current liabilities Current liabilities Total current liabilities Non-current liabilities [abstract] Non-current liabilities Non-current portion of non-current borrowings Loans payable Non-current lease liabilities Lease liabilities Deferred tax liabilities Deferred income tax liabilities Deferred income tax liabilities Non-current provision for decommissioning, restoration and rehabilitation costs Reclamation and closure cost provisions Non-current portion of reclamation and closure cost provisions Liabilities Liabilities Total liabilities Segment liabilities Equity [abstract] Shareholders' equity Issued capital Share capital Other reserves Reserves Warrant reserve Warrants Retained earnings Accumulated deficit Deficit Equity Balance at end of period Balance at beginning of period Shareholders' equity Total shareholders' equity Components of equity consisting of common shares, stock options and warrants, and deficit Equity and liabilities Total liabilities and shareholders' equity Consolidated Statements of Loss and Comprehensive Loss Revenue. Revenue No definition available. Cost of Sales Operating expense Operating expenses Total operating expense Selling expense Selling expenses Cost of sales. Cost of sales Cost of sales Gross profit Income from mine operations Expenses by nature [abstract] Expenses Expense arising from exploration for and evaluation of mineral resources Exploration and evaluation expenditures Exploration and evaluation General and administrative expense General and administrative General and administrative Total general and administrative expenses Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets Share-based compensation Share-based compensation Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination Transaction costs Transaction costs Expenses, by nature Expenses Profit (loss) from operating activities Loss from operations No definition available. ifrs_Other Non Operating Income (Expense) [Abstract] Other income (expenses) Amount of settlement of flow-through share premium. Settlement Of Flow-Through Share Premium Settlement of flow-through share premium Settlement of flow-through share premium Amount of gain (loss) on investments measured at fair value with changes in fair value recognized in profit or loss. Gain (Loss) On Investments Measured At Fair Value Through Profit Or Loss Gains (losses) on investments The amount of interest, accretion and financing expenses. Interest, Accretion And Financing Expenses Interest, accretion and financing expenses Interest income Interest income Impairment loss recognised in profit or loss Impairment reversal on equity investment Other expense, by function Other income (expenses) Amount of other nonoperating income (expense) IFRS Other Nonoperating Income (Expense) Other income (expenses) Total other income (expenses) Profit (loss) before tax Segment net loss Loss before income and mining taxes Tax expense (income) Income and mining tax recoveries - deferred Income tax expense (recovery) Profit (loss) Loss for the year Loss for the year Net loss and comprehensive loss for the year Loss and comprehensive loss for the year Basic earnings (loss) per share Loss per share - basic Diluted earnings (loss) per share Loss per share - diluted Weighted average number of ordinary shares outstanding Weighted average number of common shares outstanding - basic Weighted average number of common shares outstanding - basic Adjusted weighted average number of ordinary shares outstanding Weighted average number of common shares outstanding - diluted Weighted average number of common shares outstanding - diluted Consolidated Statements of Cash Flows Cash flows from operating activities Operating cash flows Adjustments for: Adjustments for: Adjustments for depreciation expense Depreciation Adjustments for gain (loss) on investments to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustments For Gain (Loss) On Investments Gains (losses) on investments Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss Impairment reversal on equity investment Adjustments for deferred income and mining tax recoveries to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustment For Deferred Income And Mining Tax Recoveries Income and mining tax recoveries - deferred Adjustments for change in estimate of reclamation and closure cost provisions to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustment For Change in Estimate Of Reclamation And Closure Cost Provisions Change in estimate of reclamation and closure cost provisions Amount of accretion on provision for decommissioning, reclamation and closure cost to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustments For Accretion On Provision For Decommissioning, Reclamation And Closure Cost Accretion on reclamation and closure cost provisions Adjustments for interest income Interest income Adjustments for interest expense Interest expense Amount of gain (loss) on secured note to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustments For Gain (Loss) On Secured Notes Gain on secured notes Gains (losses) on litigation settlements Settlement of legal claim Adjustments for unrealised foreign exchange losses (gains) Unrealized foreign exchange loss (gain) Adjustments for settlement of reclamation obligations to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustment For Settlement Of Reclamation Obligations Settlement of reclamation obligations Interest received, classified as operating activities Interest received Adjustments for share-based payments Share-based compensation Cash flows from (used in) operations Operating cash flow before changes in non-cash working capital Increase (decrease) in working capital Change in non-cash working capital (Note 24) Change in non-cash working capital Cash flows from (used in) operating activities Negative cash flow from operating activities Net cash and cash equivalents used in operating activities Cash flows from investing activities Investing cash flows Cash and cash equivalents in subsidiary or businesses acquired or disposed Cash acquired from Maritime acquisition Cash flows from (used in) exploration for and evaluation of mineral resources, classified as investing activities Purchases of exploration and evaluation assets Proceeds from sales or maturity of financial instruments, classified as investing activities Proceeds from sale of secured notes Proceeds of disposal Proceeds from sales of investments other than investments accounted for using equity method Disposal of investments Proceeds on disposal of investments Purchase of property, plant and equipment, classified as investing activities Purchases of property, plant and equipment Interest received, classified as investing activities Interest received on secured notes Other inflows (outflows) of cash, classified as investing activities Other assets Cash flows from (used in) investing activities Net cash and cash equivalents from (used in) investing activities Cash flows from financing activities Financing cash flows Proceeds from issue of ordinary shares Proceeds from issuance of common shares Gross proceeds from issuance of shares Payments for share issue costs Share issue costs Share issuance costs paid Proceeds from exercise of options Stock options exercised Gross proceeds from stock options exercised Proceeds from exercise of warrants Warrants exercised Repayments of borrowings, classified as financing activities Repayment of loans The cash outflow for payment of lease liabilities, principal portion, classified as financing activities. Payments of Lease Liabilities, Principal, Classified as Financing Activities Lease principal payments Interest paid, classified as financing activities Loan and lease interest payments Cash flows from (used in) financing activities Net cash and cash equivalents from financing activities Effect of exchange rate changes on cash and cash equivalents Effect of exchange rate fluctuations on cash and cash equivalents Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Net increase (decrease) in cash and cash equivalents Consolidated Statements of Changes in Equity Statement of changes in equity [table] Components of equity [axis] Components of equity [domain] Share capital [Member] Share Capital Reserves - Equity settled share-based payments [Member] Reserves - Equity settled share-based payments This member stands for a component of equity resulting from warrants. Reserves - Warrants [Member] Reserves - Warrants Deficit [Member] Deficit Statement of changes in equity [line items] Statements of Changes in Equity Number of shares outstanding Balance at ending (in shares) Balance at beginning (in shares) Value of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination. IFRS Stock Issued During Period, Value, Purchase of Assets Issued on acquisition of the Kingsway Project Issued pursuant to acquisition, Value Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination. IFRS Stock Issued During Period, Shares, Purchase of Assets Issued on acquisition of the Kingsway Project (in shares) Issued pursuant to acquisition, Shares The increase in equity through the issue of shares pursuant to acquisition of exploration and evaluation assets. Issue of Shares Pursuant to Acquisition of Exploration and Evaluation Assets, Value Issued on acquisition of exploration and evaluation assets Number of shares issued pursuant to acquisition of exploration and evaluation assets during the period. Issue of Shares Pursuant to Acquisition of Exploration and Evaluation Assets, Shares Issued on acquisition of exploration and evaluation assets (in shares) Amount of increase (decrease) through prospectus offering. Increase Decrease Through Prospectus Offering Issued in prospectus offering Number of shares issued in prospectus offering. Number of Shares Issued in Prospectus Offering Issued in prospectus offering (in shares) Issue of equity Issued in private placement Value of shares issued during the period Number of new stock issued during the period. Ifrs Stock Issued During Period Shares New Issues Issued in private placement (in shares) Common shares issued The increase (decrease) in equity resulting from flow-through share premium. Increase Decrease Through Flow-Through Share Premium Flow-through premium Share issue related cost Share issue costs Increase (decrease) through acquisition of subsidiary, equity Acquisition of Maritime Resources Corp Number of shares of stock issued during the period pursuant to acquisitions. IFRS Stock Issued During Period, Shares, Acquisitions Acquisition of Maritime Resources Corp ( in shares) The increase in value of equity shares, resulting from shares issued for debt settlement.. Increase Through Shares Issued For Debt Settlement, Values Issued pursuant to share - for - debt settlement Settlement agreement, Fair value of shares issued The increase in number of equity shares, resulting from shares issued for debt settlement.. Increase Through Shares Issued For Debt Settlement, Shares Issued pursuant to share - for - debt settlement (in shares) The increase (decrease) in equity resulting from the acquisition of assets. Increase (Decrease) Through Acquisition Of Assets Acquisition of Exploits property claims Number of shares issued upon acquisition of assets. Number Of Shares Issued Upon Acquisition Of Assets Acquisition of Exploits property claims (in shares) Number of shares issued upon acquisition of assets The increase (decrease) in equity resulting from the settlement of legal claims. Increase (Decrease) Through Settlement of Legal Claims Issued in settlement of legal claim Number of shares issued pursuant to settlement of legal claims during the period. Issue of Shares Pursuant to Settlement of Legal Claims, Shares Issued in settlement of legal claim (in shares) Increase (decrease) through exercise of options, equity Stock options exercised Number of share options (or share units) exercised during the current period. IFRS Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock options exercised (in shares) Increase (decrease) through exercise of warrants, equity Warrants exercised Number of warrants exercised during the current period. Number of Warrants Exercised Warrants exercised (in shares) Increase (decrease) through share-based payment transactions, equity Share-based compensation Comprehensive income Loss and comprehensive loss for the year No definition available. NATURE OF OPERATIONS AND GOING CONCERN Disclosure of general information about financial statements [text block] NATURE OF OPERATIONS AND GOING CONCERN The entire disclosure of basis of presentation. BASIS OF PRESENTATION Disclosure of basis of preparation of financial statements [text block] BASIS OF PRESENTATION No definition available. MATERIAL ACCOUNTING POLICY INFORMATION. Disclosure of material accounting policy information [text block] MATERIAL ACCOUNTING POLICY INFORMATION No definition available. AREAS OF SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS Disclosure of accounting judgements and estimates [text block] AREAS OF SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS ACQUISITION OF MARITIME RESOURCES CORP. Disclosure of business combinations [text block] ACQUISITION OF MARITIME RESOURCES CORP. RECEIVABLES Disclosure of trade and other receivables [text block] RECEIVABLES INVENTORIES Disclosure of inventories [text block] INVENTORIES No definition available. INVESTMENTS