3.19.1 html 285 253 1 true 77 0 false 10 false false R1.htm 001 - Document - Document and Entity Information Sheet http://www.gigametals.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 002 - Statement - Consolidated Statements of Financial Position Sheet http://www.gigametals.com/role/BalanceSheet Consolidated Statements of Financial Position Statements 2 false false R3.htm 003 - Statement - Consolidated Statements of Comprehensive Income (Loss) Sheet http://www.gigametals.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss Consolidated Statements of Comprehensive Income (Loss) Statements 3 false false R4.htm 004 - Statement - Consolidated Statement of Changes in Equity Sheet http://www.gigametals.com/role/StockholdersEquity Consolidated Statement of Changes in Equity Statements 4 false false R5.htm 005 - Statement - Consolidated Statements of Cash Flows Sheet http://www.gigametals.com/role/CashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 006 - Disclosure - Nature and continuance of operations Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfNatureAndContinuanceOfOperationsExplanatoryTextBlock Nature and continuance of operations Notes 6 false false R7.htm 007 - Disclosure - Significant accounting policies and basis of preparation Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlock Significant accounting policies and basis of preparation Notes 7 false false R8.htm 008 - Disclosure - Adoption of new accounting standards and standards issued but not yet effective Sheet http://www.gigametals.com/role/AdoptionOfNewAccountingStandardsAndStandardsIssuedButNotYetEffective Adoption of new accounting standards and standards issued but not yet effective Notes 8 false false R9.htm 009 - Disclosure - Receivables Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherReceivablesExplanatoryTextBlock Receivables Notes 9 false false R10.htm 010 - Disclosure - Marketable securities Sheet http://www.gigametals.com/role/MarketableSecurities Marketable securities Notes 10 false false R11.htm 011 - Disclosure - Equipment Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlock Equipment Notes 11 false false R12.htm 012 - Disclosure - Exploration and evaluation assets Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlock Exploration and evaluation assets Notes 12 false false R13.htm 013 - Disclosure - Trade payables and accrued liabilities Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherPayablesExplanatoryTextBlock Trade payables and accrued liabilities Notes 13 false false R14.htm 014 - Disclosure - Lease obligations Sheet http://www.gigametals.com/role/LeaseObligations Lease obligations Notes 14 false false R15.htm 015 - Disclosure - Income taxes and mining tax credits Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlock Income taxes and mining tax credits Notes 15 false false R16.htm 016 - Disclosure - Share capital Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlock Share capital Notes 16 false false R17.htm 017 - Disclosure - Share-based payment reserve Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfSharebasedPaymentArrangementsExplanatoryTextBlock Share-based payment reserve Notes 17 false false R18.htm 018 - Disclosure - Related party transactions Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock Related party transactions Notes 18 false false R19.htm 019 - Disclosure - Financial instruments and financial risk management Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlock Financial instruments and financial risk management Notes 19 false false R20.htm 020 - Disclosure - Capital management Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatoryTextBlock Capital management Notes 20 false false R21.htm 021 - Disclosure - Supplemental cash flow information Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock Supplemental cash flow information Notes 21 false false R22.htm 022 - Disclosure - Segmented information Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfEntitysReportableSegmentsExplanatoryTextBlock Segmented information Notes 22 false false R23.htm 023 - Disclosure - Subsequent events Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfEventsAfterReportingPeriodExplanatoryTextBlock Subsequent events Notes 23 false false R24.htm 024 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies Summary of Significant Accounting Policies (Policies) Policies 24 false false R25.htm 025 - Disclosure - Significant accounting policies and basis of preparation (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlockTables Significant accounting policies and basis of preparation (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlock 25 false false R26.htm 026 - Disclosure - Receivables (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherReceivablesExplanatoryTextBlockTables Receivables (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherReceivablesExplanatoryTextBlock 26 false false R27.htm 027 - Disclosure - Marketable securities (Tables) Sheet http://www.gigametals.com/role/MarketablesecuritiesTables Marketable securities (Tables) Tables http://www.gigametals.com/role/MarketableSecurities 27 false false R28.htm 028 - Disclosure - Equipment (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlockTables Equipment (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlock 28 false false R29.htm 029 - Disclosure - Exploration and evaluation assets (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlockTables Exploration and evaluation assets (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlock 29 false false R30.htm 030 - Disclosure - Trade payables and accrued liabilities (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherPayablesExplanatoryTextBlockTables Trade payables and accrued liabilities (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherPayablesExplanatoryTextBlock 30 false false R31.htm 031 - Disclosure - Lease obligations (Tables) Sheet http://www.gigametals.com/role/LeaseobligationsTables Lease obligations (Tables) Tables http://www.gigametals.com/role/LeaseObligations 31 false false R32.htm 033 - Disclosure - Income taxes and mining tax credits (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlockTables Income taxes and mining tax credits (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlock 32 false false R33.htm 034 - Disclosure - Share capital (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlockTables Share capital (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlock 33 false false R34.htm 035 - Disclosure - Related party transactions (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlockTables Related party transactions (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock 34 false false R35.htm 036 - Disclosure - Financial instruments and financial risk management (Tables) Sheet http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlockTables Financial instruments and financial risk management (Tables) Tables http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlock 35 false false R36.htm 037 - Disclosure - Nature and continuance of operations (Narrative) (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfNatureAndContinuanceOfOperationsExplanatoryTextBlockDetails Nature and continuance of operations (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfNatureAndContinuanceOfOperationsExplanatoryTextBlock 36 false false R37.htm 038 - Disclosure - Adoption of new accounting standards and standards issued but not yet effective (Narrative) (Details) Sheet http://www.gigametals.com/role/AdoptionOfNewAccountingStandardsAndStandardsIssuedButNotYetEffectiveNarrativeDetails Adoption of new accounting standards and standards issued but not yet effective (Narrative) (Details) Details http://www.gigametals.com/role/AdoptionOfNewAccountingStandardsAndStandardsIssuedButNotYetEffective 37 false false R38.htm 039 - Disclosure - Marketable securities (Narrative) (Details) Sheet http://www.gigametals.com/role/MarketableSecuritiesNarrativeDetails Marketable securities (Narrative) (Details) Details http://www.gigametals.com/role/MarketablesecuritiesTables 38 false false R39.htm 040 - Disclosure - Exploration and evaluation assets (Narrative) (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfExplorationAndEvaluationAssetsExplanatoryDetails Exploration and evaluation assets (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlockTables 39 false false R40.htm 041 - Disclosure - Share capital (Narrative) (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfIssuedCapitalExplanatoryDetails Share capital (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlockTables 40 false false R41.htm 042 - Disclosure - Related party transactions (Narrative) (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfRelatedPartyExplanatoryDetails Related party transactions (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlockTables 41 false false R42.htm 043 - Disclosure - Financial instruments and financial risk management (Narrative) (Details) Sheet http://www.gigametals.com/role/FinancialInstrumentsAndFinancialRiskManagementNarrativeDetails Financial instruments and financial risk management (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTextBlockTables 42 false false R43.htm 044 - Disclosure - Supplemental cash flow information (Narrative) (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfCashFlowStatementExplanatoryDetails Supplemental cash flow information (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock 43 false false R44.htm 045 - Disclosure - Subsequent events (Narrative) (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfEventsAfterReportingPeriodExplanatoryDetails Subsequent events (Narrative) (Details) Details http://www.gigametals.com/role/NotesToFinancialStatementsDisclosureOfEventsAfterReportingPeriodExplanatoryTextBlock 44 false false R45.htm 046 - Disclosure - Disclosure of detailed information about estimated useful life or depreciation rate (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDetailedInformationAboutEstimatedUsefulLifeOrDepreciationRateExplanatoryDetails Disclosure of detailed information about estimated useful life or depreciation rate (Details) Details 45 false false R46.htm 047 - Disclosure - Disclosure of detailed information about receivables (Details) Sheet http://www.gigametals.com/role/DisclosureOfDetailedInformationAboutReceivablesDetails Disclosure of detailed information about receivables (Details) Details 46 false false R47.htm 048 - Disclosure - Disclosure of detailed information about marketable securities (Details) Sheet http://www.gigametals.com/role/DisclosureOfDetailedInformationAboutMarketableSecuritiesDetails Disclosure of detailed information about marketable securities (Details) Details 47 false false R48.htm 049 - Disclosure - Disclosure of detailed information about property, plant and equipment (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatoryDetails Disclosure of detailed information about property, plant and equipment (Details) Details 48 false false R49.htm 050 - Disclosure - Disclosure of detailed information about deferred exploration costs (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDetailedInformationAboutDeferredExplorationCostsExplanatoryDetails Disclosure of detailed information about deferred exploration costs (Details) Details 49 false false R50.htm 051 - Disclosure - Disclosure of detailed information about proceeds of sale of NSR (Details) Sheet http://www.gigametals.com/role/DisclosureOfDetailedInformationAboutProceedsOfSaleOfNsrDetails Disclosure of detailed information about proceeds of sale of NSR (Details) Details 50 false false R51.htm 052 - Disclosure - Disclosure of detailed information about trade and other payables (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDetailedInformationAboutTradeAndOtherPayablesExplanatoryDetails Disclosure of detailed information about trade and other payables (Details) Details 51 false false R52.htm 053 - Disclosure - Disclosure of lease prepayments (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfLeasePrepaymentsExplanatoryDetails Disclosure of lease prepayments (Details) Details 52 false false R53.htm 054 - Disclosure - Disclosure of detailed information about effective income tax expense recovery (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDetailedInformationAboutEffectiveIncomeTaxExpenseRecoveryExplanatoryDetails Disclosure of detailed information about effective income tax expense recovery (Details) Details 53 false false R54.htm 055 - Disclosure - Disclosure of deferred taxes (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDeferredTaxesExplanatoryDetails Disclosure of deferred taxes (Details) Details 54 false false R55.htm 056 - Disclosure - Disclosure of detailed information about tax pools available (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfDetailedInformationAboutTaxPoolsAvailableExplanatoryDetails Disclosure of detailed information about tax pools available (Details) Details 55 false false R56.htm 057 - Disclosure - Disclosure of earnings per share (Details) Sheet http://www.gigametals.com/role/DisclosureOfEarningsPerShareDetails Disclosure of earnings per share (Details) Details 56 false false R57.htm 058 - Disclosure - Disclosure of number and weighted average exercise prices of share options (Details) Sheet http://www.gigametals.com/role/DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsDetails Disclosure of number and weighted average exercise prices of share options (Details) Details 57 false false R58.htm 059 - Disclosure - Disclosure of number and weighted average remaining contractual life of outstanding share options (Details) Sheet http://www.gigametals.com/role/DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsDetails Disclosure of number and weighted average remaining contractual life of outstanding share options (Details) Details 58 false false R59.htm 060 - Disclosure - Disclosure of detailed information about options, valuation assumptions (Details) Sheet http://www.gigametals.com/role/DisclosureOfDetailedInformationAboutOptionsValuationAssumptionsDetails Disclosure of detailed information about options, valuation assumptions (Details) Details 59 false false R60.htm 061 - Disclosure - Disclosure of detailed information about warrants, activity (Details) Sheet http://www.gigametals.com/role/DisclosureOfDetailedInformationAboutWarrantsActivityDetails Disclosure of detailed information about warrants, activity (Details) Details 60 false false R61.htm 062 - Disclosure - Disclosure of detailed information about warrants outstanding (Details) Sheet http://www.gigametals.com/role/DisclosureOfDetailedInformationAboutWarrantsOutstandingDetails Disclosure of detailed information about warrants outstanding (Details) Details 61 false false R62.htm 063 - Disclosure - Disclosure of information about key management personnel (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfInformationAboutKeyManagementPersonnelExplanatoryDetails Disclosure of information about key management personnel (Details) Details 62 false false R63.htm 064 - Disclosure - Disclosure of maturity analysis for derivative financial liabilities (Details) Sheet http://www.gigametals.com/role/DisclosureMaturityAnalysisForDerivativeFinancialLiabilitiesDetails Disclosure of maturity analysis for derivative financial liabilities (Details) Details 63 false false R64.htm 065 - Disclosure - Disclosure of financial assets (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfFinancialAssetsExplanatoryDetails Disclosure of financial assets (Details) Details 64 false false R65.htm 066 - Disclosure - Disclosure of financial liabilities (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfFinancialLiabilitiesExplanatoryDetails Disclosure of financial liabilities (Details) Details 65 false false R66.htm 067 - Disclosure - Disclosure of fair value measurement of assets (Details) Sheet http://www.gigametals.com/role/DisclosureDisclosureOfFairValueMeasurementOfAssetsExplanatoryDetails Disclosure of fair value measurement of assets (Details) Details 66 false false All Reports Book All Reports giga-20181231.xml giga-20181231.xsd giga-20181231_cal.xml giga-20181231_def.xml giga-20181231_lab.xml giga-20181231_pre.xml http://xbrl.ifrs.org/taxonomy/2018-03-16/ifrs-full http://xbrl.sec.gov/dei/2018-01-31 true true