NORTHERN DYNASTY MINERALS LTD (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
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3 Document And Entity Information Abstract NDM:DocumentAndEntityInformationAbstract
4 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
5 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
6 Document Type Concept (Submission Type) For Period dei:DocumentType
7 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
8 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
9 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
10 Entity's Reporting Status Current Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
11 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
12 Entity Ex Transition Period Concept (Yes/No) For Period dei:EntityExTransitionPeriod
13 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
14 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
15 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
16 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
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20 ASSETS Abstract ifrs-full:AssetsAbstract
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22 Restricted Cash Concept (Monetary) As Of Debit ifrs-full:RestrictedCashAndCashEquivalents
23 Mineral property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
24 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
25 Current assets Abstract ifrs-full:CurrentAssetsAbstract
26 Amounts receivable and prepaid expenses Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
27 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
28 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
29 Total Assets Concept (Monetary) As Of Debit ifrs-full:Assets
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31 Capital and reserves Abstract ifrs-full:EquityAbstract
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33 Reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
34 Deficit Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
35 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
36 LIABILITIES Abstract ifrs-full:LiabilitiesAbstract
37 Non-current liabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
38 Non-refundable early option price installment Concept (Monetary) As Of Credit NDM:NonrefundableEarlyOptionPriceInstallment
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42 Payables to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesToRelatedParties
43 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
44 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
45 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
46 Total Equity and Liabilities Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
47 Commitments (note 14) Concept (Monetary) As Of Credit NDM:Commitments
48 00000003 - Statement - Consolidated Statements of Comprehensive Loss Network

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49 Implied Table Table

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50 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
51 Expenses Abstract ifrs-full:ProfitLossAbstract
52 Exploration and evaluation expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
53 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
54 Legal, accounting and audit Concept (Monetary) For Period Debit ifrs-full:AuditorsRemunerationForAuditServices
55 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
56 Loss from operating activities Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
57 Foreign exchange (gain) loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
58 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
59 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
60 Gain on sale of royalty Concept (Monetary) For Period Credit NDM:GainonSaleOfRoyalty
61 Receipt of royalty income Concept (Monetary) For Period Credit ifrs-full:RevenueFromRoyalties
62 Recognition of non-refundable early option price installment Concept (Monetary) For Period Credit NDM:RecognitionofNonrefundableEarlyOptionPriceInstallment
63 Loss before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
64 Deferred Income tax (recovery) expense Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
65 Net loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
66 Other comprehensive (income) loss Abstract ifrs-full:OtherComprehensiveIncomeAbstract
67 Items that may be subsequently reclassified to net loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
68 Foreign exchange translation difference Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
69 Other comprehensive (income) loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeAttributableToOwnersOfParent
70 Total comprehensive loss Concept (Monetary) For Period Debit NDM:ComprehensiveLoss
71 Basic and diluted loss per common share Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
72 00000004 - Statement - Consolidated Statements of Cash Flows Network

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73 Implied Table Table

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74 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
75 Operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
76 Net loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
77 Non-cash or non operating items Abstract ifrs-full:ClassesOfCashPaymentsAbstract
78 Depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
79 Gain on sale of royalty Concept (Monetary) For Period Credit NDM:GainonSaleOfRoyalty
80 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
81 Non-current legal fees payable Concept (Monetary) For Period Debit NDM:NoncurrentLegalFeesPayable
82 Non-refundable early option price installment Concept (Monetary) For Period Debit NDM:NonrefundableEarlyOptionPriceInstallment1
83 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
84 Unrealized exchange loss Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
85 Changes in working capital items Abstract NDM:IncreaseDecreaseInWorkingCapitalAbstract
86 Restricted cash Concept (Monetary) For Period Credit NDM:IncreaseDecreasesInRestrictedCash
87 Amounts receivable and prepaid expenses Concept (Monetary) For Period Credit NDM:IncreaseDecreaseInAmountsReceivableAndPrepaidExpenses
88 Trade and other payables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
89 Payables to related parties Concept (Monetary) For Period Debit NDM:AdjustmentsForIncreaseDecreaseInPayablesToRelatedParties
90 Net cash used in operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
91 Investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
92 Acquisition of plant and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
93 Proceeds from sale of royalty Concept (Monetary) For Period Debit NDM:ProceedsfromSaleOfRoyalty
94 Interest received on cash and cash equivalents Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnCashAndCashEquivalents
95 Net cash from (used in) investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
96 Financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
97 Net proceeds from private placement of special warrants Concept (Monetary) For Period Debit NDM:NetProceedsFromPrivatePlacementOfSpecialWarrants
98 Net proceeds from bought deal financing Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
99 Cash settlement of equity-settled restricted share units Concept (Monetary) For Period Debit NDM:CashSettlementOfEquitysettledRestrictedShareUnits
100 Withholding taxes paid on equity-settled restricted share units Concept (Monetary) For Period Debit NDM:WitholdingTaxesPaidOnEquitysettledRestrictedShareUnits
101 Non-refundable early option price installment Concept (Monetary) For Period Debit NDM:NonrefundableEarlyOptionPriceInstallmentPayments
102 Proceeds from the exercise of share purchase options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
103 Proceeds from the exercise of warrants Concept (Monetary) For Period Debit NDM:ProceedsFromExerciseOfWarrants
104 Net cash from financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
105 Net (decrease) increase in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
106 Effect of exchange rate fluctuations on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
107 Cash and cash equivalents - beginning balance Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
108 Cash and cash equivalents - ending balance Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
109 Supplementary cash flow information (note 6(a)) Abstract us-gaap:SupplementalCashFlowInformationAbstract
110 00000005 - Statement - Consolidated Statements of Changes in Equity Network

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111 Statement of changes in equity [table] Table

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112 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
113 Equity [member] Member ifrs-full:EquityMember
114 Share Capital [Member] Member ifrs-full:IssuedCapitalMember
115 Equity Settled Share-Based Compensation Reserve [Member] Member NDM:EquitySettledShareBasedCompensationReserveMember
116 Foreign Currency Translation Reserve [Member] Member NDM:ForeignCurrencyTranslationReserveMember
117 Investment Revaluation Reserve [Member] Member NDM:InvestmentRevaluationReserveMember
118 Share Purchase Warrants [Member] Member NDM:SharePurchaseWarrantMember
119 Deficit [Member] Member NDM:DeficitMember
120 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
121 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
122 Balance, shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
123 Shares issued pursuant to bought deal financing, net of transaction costs Concept (Monetary) For Period Credit NDM:SharesIssuedPursuantToBoughtDealFinancingNetOfTransactionCosts
124 Shares issued pursuant to bought deal financing, net of transaction costs, shares Concept (Shares) For Period NDM:SharesIssuedPursuantToBoughtDealFinancingNetOfTransactionCostsShares
125 Shares issued on exercise of options per option plan Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise
126 Shares issued on exercise of options per option plan, shares Concept (Shares) For Period NDM:SharesIssuedOnExerciseOfOptionsPerOptionPlanShares
127 Shares issued on exercise of options not under option plan Concept (Monetary) For Period Credit NDM:SharesIssuedUponExerciseOfOptionsNotUnderOptionPlan
128 Shares issued on exercise of options not under option plan, shares Concept (Shares) For Period NDM:SharesIssuedUponExerciseOfOptionsNotUnderOptionPlanShares
129 Shares issued upon exercise of warrants Concept (Monetary) For Period Debit NDM:SharesIssuedUponExerciseOfWarrants
130 Shares issued upon exercise of warrants, shares Concept (Shares) For Period NDM:SharesIssuedUponExerciseOfWarrantsShares
131 Shares issued pursuant to restricted share unit plan Concept (Monetary) For Period Credit NDM:SharesIssuedPursuantToRestrictedShareUnitPlan
132 Shares issued pursuant to restricted share unit plan, shares Concept (Shares) For Period NDM:SharesIssuedPursuantToRestrictedShareUnitPlanShares
133 Cash settlement of tax on issue of equity-settled restricted share units Concept (Monetary) For Period Credit NDM:CashSettlementOfTaxOnIssueOfEquitysettledRestrictedShareUnits
134 Cash settlement of equity-settled restricted share units Concept (Monetary) For Period Debit NDM:CashSettlementOfEquitysettledRestrictedShareUnits
135 Fair value allocated to shares issued on options exercised per plan Concept (Monetary) For Period Credit NDM:FairValueAllocatedToSharesIssuedOnOptionsExercisedPerPlan
136 Fair value allocated to shares issued on options exercised not under option plan Concept (Monetary) For Period Credit NDM:FairValueAllocatedToSharesIssuedOnOptionsExercisedNotUnderOptionPlan
137 Fair value and costs transferred to share capital on exercise of warrants Concept (Monetary) For Period Debit NDM:FairValueAndCostsTransferredToShareCapitalOnExerciseOfWarrants
138 Fair value transferred to reserve on expiry of warrants Concept (Monetary) For Period Credit NDM:FairValueTransferredToReserveOnExpiryOfWarrants
139 Share-based compensation Concept (Monetary) For Period Debit NDM:ShareBasedCompensationExpense
140 Special warrants issued net of transaction costs Concept (Monetary) For Period Credit NDM:SpecialWarrantsIssuedNetOfTransactionCosts
141 Effect of change in accounting policy for IFRS 9 Concept (Monetary) For Period Credit NDM:EffectofChangeInAccountingPolicy
142 Net loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
143 Other comprehensive (loss) income net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeAttributableToOwnersOfParent
144 Total comprehensive (loss) income Concept (Monetary) For Period Debit NDM:ComprehensiveLoss
145 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
146 Balance, shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
147 00000006 - Disclosure - Nature and Continuance of Operations Network

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150 Nature and Continuance of Operations Concept (Text Block (HTML)) For Period NDM:DisclosureOfNatureAndContinuanceOfOperationsTextBlock
151 00000007 - Disclosure - Significant Accounting Policies Network

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153 Significant Accounting Policies Abstract NDM:SignificantAccountingPracticesAbstract
154 Significant Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
155 00000008 - Disclosure - Other Income Items Network

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156 Implied Table Table

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157 Other Income Items Abstract NDM:OtherIncomeItemsAbstract
158 Other Income Items Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExplanatory
159 00000009 - Disclosure - Mineral Property, Plant and Equipment Network

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160 Implied Table Table

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161 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
162 Mineral Property, Plant and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
163 00000010 - Disclosure - Amounts Receivable and Prepaid Expenses Network

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164 Implied Table Table

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165 Amounts Receivable And Prepaid Expenses Abstract NDM:AmountsReceivableAndPrepaidExpensesAbstract
166 Amounts Receivable and Prepaid Expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExpensesExplanatory
167 00000011 - Disclosure - Cash and Cash Equivalents and Restricted Cash Network

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168 Implied Table Table

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170 Cash and Cash Equivalents and Restricted Cash Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRestrictedCashAndCashEquivalentsExplanatory
171 00000012 - Disclosure - Capital and Reserves Network

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172 Implied Table Table

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174 Capital and Reserves Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
175 00000013 - Disclosure - Related Party Balances and Transactions Network

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178 Related Party Balances and Transactions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
179 00000014 - Disclosure - Trade and Other Payables Network

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182 Trade and Other Payables Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
183 00000015 - Disclosure - Basic and Diluted Loss Per Share Network

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185 Basic and diluted earnings per share [abstract] Abstract ifrs-full:BasicAndDilutedEarningsPerShareAbstract
186 Basic and Diluted Loss Per Share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
187 00000016 - Disclosure - Employment Costs Network

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191 00000017 - Disclosure - Income Tax Expense Network

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195 00000018 - Disclosure - Financial Risk Management Network

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199 00000019 - Disclosure - Commitments and Contingencies Network

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202 Commitments and Contingencies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
203 00000020 - Disclosure - Events After the Reporting Date Network

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207 00000021 - Disclosure - Significant Accounting Policies (Policies) Network

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211 Basis of Preparation Concept (Text Block (HTML)) For Period NDM:DescriptionOfAccountingPolicyForBasisOfPreparation
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213 Basis of Consolidation Concept (Text Block (HTML)) For Period NDM:DescriptionOfAccountingPolicyForBasisOfConsolidation
214 Foreign Currencies Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
215 Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
216 Exploration and Evaluation Expenditure Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForExplorationAndEvaluationExpenditures
217 Mineral Property, Plant and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
218 Impairment of Non-Financial Assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
219 Share Capital, Special Warrants and Warrants Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForWarrantsExplanatory
220 Share-based Payment Transactions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
221 Income Taxes Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
222 Restoration, Rehabilitation, and Environmental Obligations Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDecommissioningRestorationAndRehabilitationProvisionsExplanatory
223 Loss Per Share Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
224 Segment Reporting Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
225 Significant Accounting Estimates and Judgments Concept (Text Block (HTML)) For Period NDM:DescriptionOfAccountingPolicyForSignificantAccountingEstimatesAndJudgments
226 Accounting Standards, Amendments and Revised Standards Not Yet Effective Concept (Text Block (HTML)) For Period NDM:DescriptionOfAccountingPolicyForAccountingStandardsAmendmentsAndRevisedStandardsNotYetEffective
227 00000022 - Disclosure - Significant Accounting Policies (Tables) Network

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231 00000023 - Disclosure - Mineral Property, Plant and Equipment (Tables) Network

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235 00000024 - Disclosure - Amounts Receivable and Prepaid Expenses (Tables) Network

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239 00000025 - Disclosure - Cash and Cash Equivalents and Restricted Cash (Tables) Network

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243 00000026 - Disclosure - Capital and Reserves (Tables) Network

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249 Schedule of Share Purchase Warrants and Options Not Issued Under the Group's Incentive Plan Concept (Text Block (HTML)) For Period NDM:ScheduleOfSharePurchaseWarrantsAndOptionsNotIssuedUnderGroupsIncentivePlan
250 Schedule of Options Outstanding and Exercisable Concept (Text Block (HTML)) For Period NDM:ScheduleOfOptionsOutstandingAndExercisableTableTextBlock
251 Summary of Options Outstanding Concept (Text Block (HTML)) For Period NDM:SummaryOfOptionsOutstanding
252 Schedule of Fair Value Assumptions Using Black Scholes Option Pricing Concept (Text Block (HTML)) For Period NDM:ScheduleOfFairValueAssumptionsUsingBlackScholesOptionPricing
253 Schedule of Options Exercised Concept (Text Block (HTML)) For Period NDM:ScheduleOfOptionsExercised
254 Schedule of Restricted Share Units Outstanding Concept (Text Block (HTML)) For Period NDM:ScheduleOfRestrictedShareUnitsOutstanding
255 Schedule of Foreign Currency Translation Reserve Concept (Text Block (HTML)) For Period NDM:ScheduleOfForeignCurrencyTranslationReserveTableTextBlock
256 00000027 - Disclosure - Related Party Balances and Transactions (Tables) Network

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264 Schedule of Outstanding Balances Concept (Text Block (HTML)) For Period NDM:ScheduleOfOutstandingBalances
265 00000028 - Disclosure - Trade and Other Payables (Tables) Network

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269 00000029 - Disclosure - Basic and Diluted Loss Per Share (Tables) Network

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271 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
272 Schedule of Basic and Diluted Loss Per Share Concept (Text Block (HTML)) For Period NDM:ScheduleOfBasicAndDilutedLossPerShare
273 00000030 - Disclosure - Income Tax Expense (Tables) Network

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274 Implied Table Table

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275 Income Tax Expense Abstract NDM:DisclosureOfIncomeTaxExpenseAbstract
276 Schedule of Current and Deferred Expenses Concept (Text Block (HTML)) For Period NDM:ScheduleOfCurrentAndDeferredExpenses
277 Schedule of Reconciliation of Effective Tax Rate Concept (Text Block (HTML)) For Period NDM:ScheduleOfReconciliationOfEffectiveTaxRate
278 Schedule of Deferred Income Tax Assets (Liabilities) Concept (Text Block (HTML)) For Period NDM:ScheduleOfDeferredIncomeTaxAssetsLiabilities
279 Schedule of Taxable Temporary Differences on Investments Concept (Text Block (HTML)) For Period NDM:ScheduleOfTaxableTemporaryDifferencesOnInvestments
280 00000031 - Disclosure - Financial Risk Management (Tables) Network

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281 Implied Table Table

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282 Financial Risk Management Abstract NDM:DisclosureOfFinancialRiskManagementAbstract
283 Schedule of Financial Assets and Liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory
284 00000032 - Disclosure - Commitments and Contingencies (Tables) Network

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285 Implied Table Table

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286 Capital commitments [abstract] Abstract ifrs-full:CapitalCommitmentsAbstract
287 Schedule of Maturity of Leases Concept (Text Block (HTML)) For Period NDM:ScheduleOfMaturityOfLeases
288 00000033 - Disclosure - Nature and Continuance of Operations (Details Narrative) Network

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289 SignificantAccountingPracticesTable [Table] Table

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290 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
291 Risks [member] Member ifrs-full:TypesOfRisksMember
292 U.S. $ [Member] Member NDM:USMember
293 SignificantAccountingPracticesLineItems [Line Items] LineItems NDM:SignificantAccountingPracticesLineItems
294 Aggregate proceeds from issuance of shares and warrants Concept (Monetary) For Period Debit NDM:ProceedsFromIssuanceSharesAndWarrants
295 Proceeds from exercise of share purchase options and warrants Concept (Monetary) For Period Credit NDM:ProceedsFromExerciseOfSharePurchaseOptionsAndWarrants
296 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
297 Net loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
298 Retained earnings deficit Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
299 Net proceeds from bought deal financing Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
300 Proceeds from private placement Concept (Monetary) For Period Debit NDM:ProceedsFromPrivatePlacement
301 00000034 - Disclosure - Significant Accounting Policies (Details Narrative) Network

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302 SignificantAccountingPracticesTable [Table] Table

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303 Range [axis] Axis ifrs-full:RangeAxis
304 Ranges [member] Member ifrs-full:RangesMember
305 Minimum [Member] Member ifrs-full:BottomOfRangeMember
306 Maximum [Member] Member ifrs-full:TopOfRangeMember
307 SignificantAccountingPracticesLineItems [Line Items] LineItems NDM:SignificantAccountingPracticesLineItems
308 Impairment losses Concept (Monetary) For Period Debit ifrs-full:ImpairmentLoss
309 Percentage on write off cost of plant and equipment Concept (Percent) For Period NDM:PercentageOnWriteOffCostOfPlantAndEquipment
310 Reporting segments Concept (Integer) For Period NDM:ReportingSegments
311 00000035 - Disclosure - Significant Accounting Policies - Schedule of Subsidiaries Consolidated Financial Statements (Details) Network

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312 SignificantAccountingPracticesTable [Table] Table

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313 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
314 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
315 Canada Inc [Member] Member NDM:CanadaIncMember
316 Pebble Services Inc. [Member] Member NDM:PebbleServicesIncMember
317 Northern Dynasty Partnership [Member] Member NDM:NorthernDynastyPartnershipMember
318 Pebble Limited Partnership [Member] Member NDM:PebbleLimitedPartnershipMember
319 Pebble Mines Corp. [Member] Member NDM:PebbleMinesCorpMember
320 Pebble West Claims Corporation [Member] Member NDM:PebbleWestClaimsCorporationMember
321 Pebble East Claims Corporation [Member] Member NDM:PebbleEastClaimsCorporationMember
322 U5 Resources Inc. [Member] Member NDM:UFiveResourcesIncMember
323 Cannon Point Resources Ltd. [Member] Member NDM:CannonPointResourcesLtdMember
324 MGL Subco Ltd. [Member] Member NDM:MGLSubcoLtdMember
325 Delta Minerals Inc. [Member] Member NDM:DeltaMineralsIncMember
326 Imperial Gold Corporation [Member] Member NDM:ImperialGoldCorporationMember
327 Yuma Gold Inc. [Member] Member NDM:YumaGoldIncMember
328 SignificantAccountingPracticesLineItems [Line Items] LineItems NDM:SignificantAccountingPracticesLineItems
329 Name of Subsidiary Concept (Text/String) For Period ifrs-full:NameOfSubsidiary
330 Place of Incorporation Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOrResidenceOfSubsidiary
331 Principal Activity Concept (Text/String) For Period NDM:NameOfPrincipalActivity
332 Ownership Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
333 00000037 - Disclosure - Other Income Items (Details Narrative) Network

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334 FrameworkAgreementWithACompanyTable [Table] Table

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335 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
336 Risks [member] Member ifrs-full:TypesOfRisksMember
337 U.S. $ [Member] Member NDM:USMember
338 FrameworkAgreementWithACompanyLineItems [Line Items] LineItems NDM:FrameworkAgreementWithACompanyLineItems
339 Ownership interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
340 Non-refundable early option price installment payment Concept (Monetary) For Period Debit NDM:NonrefundableEarlyOptionPriceInstallmentPayment
341 Proceeds from sale of royalty Concept (Monetary) For Period Debit NDM:ProceedsfromSaleOfRoyalty
342 Receipt of royalty income Concept (Monetary) For Period Credit ifrs-full:RevenueFromRoyalties
343 00000038 - Disclosure - Mineral Property, Plant and Equipment - Schedule of Exploration and Evaluation Assets (Details) Network

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344 PropertyPlantAndEquipmentTable [Table] Table

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345 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
346 Assets [member] Member ifrs-full:ClassesOfAssetsMember
347 Mineral Property Interest [Member] Member NDM:MineralPropertyInterestMember
348 Plant and Equipment [Member] Member NDM:PlantAndEquipmentMember
349 PropertyPlantsAndEquipmentLineItems [Line Items] LineItems NDM:PropertyPlantsAndEquipmentLineItems
350 Cost, Beginning balance Concept (Monetary) As Of Debit NDM:Cost
351 Cost, Additions Concept (Monetary) For Period Debit NDM:CostAdditions
352 Cost, Ending balance Concept (Monetary) As Of Debit NDM:Cost
353 Accumulated depreciation, Beginning balance Concept (Monetary) As Of Credit NDM:AccumulatedDepreciation
354 Accumulated depreciation, Depreciation Concept (Monetary) For Period Credit NDM:AccumulatedDepreciationDepreciation
355 Accumulated depreciation, Ending balance Concept (Monetary) As Of Credit NDM:AccumulatedDepreciation
356 Foreign currency translation difference Concept (Monetary) For Period Credit NDM:ForeignCurrencyTranslationDifference
357 Net carrying value - Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
358 00000039 - Disclosure - Mineral Property, Plant and Equipment - Schedule of Exploration and Evaluation Assets (Details) (Parenthetical) Network

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359 PropertyPlantAndEquipmentTable [Table] Table

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361 Assets [member] Member ifrs-full:ClassesOfAssetsMember
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363 PropertyPlantsAndEquipmentItemsLineItems [Line Items] LineItems NDM:PropertyPlantsAndEquipmentItemsLineItems
364 Number of mineral claims Concept (Integer) For Period NDM:NumberOfMineralClaims
365 Area of land Concept (num:areaItemType) As Of NDM:AreasOfLand
366 Mineral claims covering area, description Concept (Text/String) For Period NDM:MineralClaimsCoveringAreaDescription
367 00000040 - Disclosure - Amounts Receivable and Prepaid Expenses - Schedule of Amounts Receivable and Prepaid Expenses (Details) Network

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368 Implied Table Table

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369 Amounts Receivable And Prepaid Expenses Abstract NDM:AmountsReceivableAndPrepaidExpensesAbstract
370 Sales tax receivable Concept (Monetary) As Of Debit ifrs-full:ReceivablesFromTaxesOtherThanIncomeTax
371 Amounts receivable Concept (Monetary) As Of Debit NDM:AmountsReceivable
372 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
373 Total Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
374 00000041 - Disclosure - Cash and Cash Equivalents and Restricted Cash (Details Narrative) Network

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375 CashAndCashEquivalentsTable [Table] Table

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376 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
377 Equity [member] Member ifrs-full:EquityMember
378 Restricted Stock Units [Member] Member NDM:RestrictedStockUnitsMember
379 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
380 Risks [member] Member ifrs-full:TypesOfRisksMember
381 U.S. $ [Member] Member NDM:USMember
382 CashAndCashEquivalentLineItems [Line Items] LineItems NDM:CashAndCashEquivalentLineItems
383 Number of common shares issued Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
384 Proceeds from purchase of special warrants Concept (Monetary) For Period Credit NDM:ProceedsFromPurchaseOfSpecialWarrants
385 Number of purchase shares of special warrants Concept (Shares) For Period NDM:NumberOfPurchaseSharesOfSpecialWarrants
386 Cash deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
387 Total income Concept (Monetary) For Period Credit ifrs-full:InvestmentIncome
388 Reclamation liability Concept (Monetary) As Of Credit NDM:ReclamationLiability
389 00000042 - Disclosure - Cash and Cash Equivalents and Restricted Cash - Schedule of Cash and Cash Equivalents (Details) Network

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390 CashAndCashEquivalentsTable [Table] Table

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391 Cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis
392 Entity's total for cash-generating units [member] Member ifrs-full:EntitysTotalForCashgeneratingUnitsMember
393 Business and Savings Accounts [Member] Member NDM:BusinessAndSavingsAccountsMember
394 Guaranteed Investment Certificates [Member] Member NDM:GuaranteedInvestmentCertificatesMember
395 CashAndCashEquivalentLineItems [Line Items] LineItems NDM:CashAndCashEquivalentLineItems
396 Total Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
397 00000046 - Disclosure - Capital and Reserves - Summary of Options Outstanding (Details) Network

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398 Implied Table Table

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399 Capital commitments [abstract] Abstract ifrs-full:CapitalCommitmentsAbstract
400 Number of options, Beginning Balance Concept (Shares) For Period NDM:NumberOfOptionsBeginningBalance
401 Number of options, Granted Concept (Shares) For Period NDM:NumberOfOptionsGranted
402 Number of options, Expired Concept (Shares) For Period NDM:NumberOfOptionsExpired
403 Number of options, Exercised Concept (Shares) For Period NDM:NumberOfOptionsExercised
404 Number of options, Forfeited Concept (Shares) For Period NDM:NumberOfOptionsForfeited
405 Number of options, Cancelled Concept (Decimal) For Period NDM:NumberOfSharesOptionsCancelled
406 Number of options, Ending Balance Concept (Shares) For Period NDM:NumberOfOptionsEndingBalance
407 Weighted average exercise price, Beginning Balance Concept (Share) For Period NDM:WeightedAverageExercisePriceBeginningBalance
408 Weighted average exercise price, Granted Concept (Share) For Period NDM:WeightedAverageExercisePriceGranted
409 Weighted average exercise price, Expired Concept (Share) For Period NDM:WeightedAverageExercisePriceExpired
410 Weighted average exercise price, Exercised Concept (Share) For Period NDM:WeightedAverageExercisePriceExercised
411 Weighted average exercise price, Forfeited Concept (Share) For Period NDM:WeightedAverageExercisePriceForfeited
412 Weighted average exercise price, Cancelled Concept (Share) For Period NDM:WeightedAverageExercisePriceOptionCancelled
413 Weighted average exercise price, Ending Balance Concept (Share) For Period NDM:WeightedAverageExercisePriceEndingBalance
414 00000047 - Disclosure - Capital and Reserves - Schedule of Fair Value Assumptions Using Black Scholes Option Pricing (Details) Network

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415 Implied Table Table

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416 Capital commitments [abstract] Abstract ifrs-full:CapitalCommitmentsAbstract
417 Risk-free interest rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
418 Expected life Concept (xbrli:durationItemType) For Period NDM:ExpectedLifeOfShareOptionsGranted
419 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
420 Grant date share price Concept (Share) As Of NDM:GrantDateSharePrice
421 Expected dividend yield Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
422 00000049 - Disclosure - Capital and Reserves - Schedule of Restricted Share Units Outstanding (Details) Network

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423 Implied Table Table

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424 Capital commitments [abstract] Abstract ifrs-full:CapitalCommitmentsAbstract
425 Number of RSUs, Beginning Balance Concept (Shares) As Of NDM:NumberOfRestrictedStockUnitsBalance
426 Number of RSUs, Granted Concept (Shares) For Period NDM:NumberOfRestrictedStockUnitsGranted
427 Number of RSUs, Cash settled Concept (Shares) For Period NDM:NumberOfRestrictedStockUnitsCashSettled
428 Number of RSUs, Withheld Concept (Shares) For Period NDM:NumberOfRestrictedStockUnitsWithheld
429 Number of RSUs, Shares issued Concept (Shares) For Period NDM:NumberOfRestrictedStockUnitsSharesIssued
430 Number of RSUs, Ending Balance Concept (Shares) As Of NDM:NumberOfRestrictedStockUnitsBalance
431 Weighted average fair value, Beginning Balance Concept (Share) As Of NDM:RestrictedStockUnitsWeightedAverageFairValueBalance
432 Weighted average fair value, Granted Concept (Share) For Period NDM:RestrictedStockUnitsWeightedAverageFairValueGranted
433 Weighted average fair value, Cash settled Concept (Share) For Period NDM:RestrictedStockUnitsWeightedAverageFairValueCashSettled
434 Weighted average fair value, Withheld Concept (Share) For Period NDM:RestrictedStockUnitsWeightedAverageFairValueWithheld
435 Weighted average fair value, Shares issued Concept (Share) For Period NDM:RestrictedStockUnitsWeightedAverageFairValueSharesIssued
436 Weighted average fair value, Ending Balance Concept (Share) As Of NDM:RestrictedStockUnitsWeightedAverageFairValueBalance
437 00000051 - Disclosure - Capital and Reserves - Schedule of Foreign Currency Translation Reserve (Details) Network

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438 Implied Table Table

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439 Capital commitments [abstract] Abstract ifrs-full:CapitalCommitmentsAbstract
440 Beginning balance Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslation
441 Gain (loss) on translation of foreign subsidiaries Concept (Monetary) For Period Credit NDM:LossGainOnTranslationOfForeignSubsidiaries
442 Ending balance Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslation
443 00000052 - Disclosure - Related Party Balances and Transactions (Details Narrative) Network

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444 RelatedPartyTransactionsTable [Table] Table

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445 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
446 Counterparties [member] Member ifrs-full:CounterpartiesMember
447 Key Management Personnel [Member] Member NDM:KeyManagementPersonnelMember
448 RelatedPartyTransactionsLineItems [Line Items] LineItems NDM:RelatedPartyTransactionsLineItems
449 Number of restricted stock vested Concept (Shares) For Period NDM:NumberOfRestrictedStockVested
450 Equity obligation payment Concept (Monetary) For Period Credit NDM:EquityObligationPayment
451 Number of options exercised Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
452 Weighted average exercise price Concept (Share) As Of NDM:KeyManagementPersonnelWeightedAverageExercisePrice
453 Weighted average market price on exercise Concept (Share) As Of NDM:WeightedAverageMarketPriceOnExercise
454 Proceeds from KMP Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
455 00000053 - Disclosure - Related Party Balances and Transactions - Schedule of Related Party Balances and Transactions (Details) Network

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456 RelatedPartyTransactionsTable [Table] Table

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457 Related Party [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
458 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
459 Hunter Dickinson Services Inc. [Member] Member NDM:HunterDickinsonServicesIncMember
460 Key Management Personnel [Member] Member NDM:KeyManagementPersonnelMember
461 RSU liability [Member] Member NDM:RSUliabilityMember
462 RelatedPartyTransactionsLineItems [Line Items] LineItems NDM:RelatedPartyTransactionsLineItems
463 Payables to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesToRelatedParties
464 00000054 - Disclosure - Related Party Balances and Transactions - Schedule of Outstanding Balances (Details) Network

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465 RelatedPartyTransactionsTable [Table] Table

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467 Counterparties [member] Member ifrs-full:CounterpartiesMember
468 Key Management Personnel [Member] Member NDM:KeyManagementPersonnelMember
469 Hunter Dickinson Services Inc. [Member] Member NDM:HunterDickinsonServicesIncMember
470 RelatedPartyTransactionsLineItems [Line Items] LineItems NDM:RelatedPartyTransactionsLineItems
471 Amounts paid and payable to HDSI for services of KMP employed by HDSI Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
472 Amounts paid and payable to KMP Concept (Monetary) For Period Debit NDM:KeyManagementPersonnelCompensationAmountPaid
473 Bonuses paid to KMP Concept (Monetary) For Period Debit NDM:KeyManagementPersonnelCompensationBonustPaid
474 Compensation gross Concept (Monetary) For Period Debit NDM:KeyManagementPersonnelCompensationGross
475 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
476 Total compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
477 Services rendered by HDSI Concept (Monetary) For Period Debit NDM:ServicesRendered
478 Technical Concept (Monetary) For Period Debit NDM:Technical
479 Engineering Concept (Monetary) For Period Debit NDM:Engineering
480 Environmental Concept (Monetary) For Period Debit NDM:Environmental
481 Socioeconomic Concept (Monetary) For Period Debit NDM:Socioeconomic
482 Other technical services Concept (Monetary) For Period Debit NDM:OtherTechnicalServices
483 General and administrative Concept (Monetary) For Period Debit NDM:GeneralAndAdministrativeExpenses
484 Management, corporate communications, secretarial, financial and administration Concept (Monetary) For Period Debit NDM:ManagementCorporateCommunicationsSecretarialFinancialAndAdministration
485 Shareholder communication Concept (Monetary) For Period Debit NDM:ShareholderCommunication
486 Reimbursement of third party expenses Concept (Monetary) For Period Debit NDM:ReimbursementOfThirdPartyExpensesIncurred
487 Conferences and travel Concept (Monetary) For Period Debit ifrs-full:TravelExpense
488 Insurance Concept (Monetary) For Period Debit ifrs-full:InsuranceExpense
489 Office supplies and information technology Concept (Monetary) For Period Debit NDM:OfficeSuppliesAndInformationTechnology
490 Total value of transactions with HDSI Concept (Monetary) For Period Debit NDM:RelatedPartyTransactionsValue
491 00000056 - Disclosure - Trade and Other Payables - Schedule of Trade and Other Payables (Details) Network

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492 Implied Table Table

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493 Trade and other payables [abstract] Abstract ifrs-full:TradeAndOtherPayablesAbstract
494 Trade, current Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
495 Total, current Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
496 Trade, noncurrent Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesToTradeSuppliers
497 Total, noncurrent Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayables
498 00000057 - Disclosure - Basic and Diluted Loss Per Share (Details Narrative) Network

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499 IncomeStatementTable [Table] Table

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500 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
501 Equity [member] Member ifrs-full:EquityMember
502 Employee Share Purchase Options [Member] Member NDM:EmployeeSharePurchaseOptionsMember
503 Non Employee Share Purchase Options [Member] Member NDM:NonEmployeeSharePurchaseOptionsMember
504 Deferred Share Units [Member] Member NDM:DeferredShareUnitsMember
505 Restricted Share Units [Member] Member NDM:RestrictedShareUnitsMember
506 IncomeStatementLineItems [Line Items] LineItems NDM:IncomeStatementLineItems
507 Anti-dilutive securities excluded from computation of diluted loss per share Concept (Shares) For Period NDM:AntidilutiveSecuritiesExcludedFromComputationOfDilutedLossPerShare
508 00000058 - Disclosure - Basic and Diluted Loss Per Share - Schedule of Basic and Diluted Loss Per Share (Details) Network

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509 Implied Table Table

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510 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
511 Loss attributable to common shareholders Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
512 Weighted average number of common shares outstanding Concept (Shares) For Period ifrs-full:WeightedAverageShares
513 00000059 - Disclosure - Employment Costs (Details Narrative) Network

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514 Implied Table Table

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515 Employment Costs Abstract NDM:DisclosureOfEmploymentCostsAbstract
516 Salaries and benefits Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
517 Share-based payments Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
518 00000060 - Disclosure - Income Tax Expense (Details Narrative) Network

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519 Implied Table Table

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521 Domestic tax rate, percent Concept (Percent) For Period ifrs-full:ApplicableTaxRate
522 Investments in foreign subsidiaries Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiaries
523 00000061 - Disclosure - Income Tax Expense - Schedule of Current and Deferred Expenses (Details) Network

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524 Implied Table Table

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525 Income Tax Expense Abstract NDM:DisclosureOfIncomeTaxExpenseAbstract
526 Current tax : Current year (recovery) expense Concept (Monetary) For Period Debit NDM:CurrentYearRecoveryExpense
527 Current income tax (recovery) expense Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
528 Deferred income tax : Current year (recovery) expense Concept (Monetary) For Period Debit NDM:DeferredCurrentYearRecoveryExpense
529 Deferred income tax (recovery) expense Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
530 00000062 - Disclosure - Income Tax Expense - Schedule of Reconciliation of Effective Tax Rate (Details) Network

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531 Implied Table Table

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532 Income Tax Expense Abstract NDM:DisclosureOfIncomeTaxExpenseAbstract
533 Net loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
534 Total income tax (recovery) expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
535 Loss excluding income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
536 Income tax recovery using the Company's domestic tax rate Concept (Monetary) For Period Debit NDM:IncomeTaxDomesticTaxRate
537 Non-deductible expenses and other Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
538 Change in tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
539 Deferred income tax assets not recognized Concept (Monetary) For Period Debit NDM:DeferredIncomeTaxAssetsNotRecognized
540 Deferred income tax (recovery) expense Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
541 00000063 - Disclosure - Income Tax Expense - Schedule of Deferred Income Tax Assets (Liabilities) (Details) Network

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542 Implied Table Table

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543 Income Tax Expense Abstract NDM:DisclosureOfIncomeTaxExpenseAbstract
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545 Net deferred income tax assets Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
546 Resource property/investment in Pebble Partnership Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
547 Equipment Concept (Monetary) As Of Debit NDM:Equipment
548 Net deferred income tax liability Concept (Monetary) As Of Credit ifrs-full:NetDeferredTaxLiabilities
549 00000065 - Disclosure - Financial Risk Management (Details Narrative) Network

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 http://northerndynastyminerals.com/role/FinancialRiskManagementDetailsNarrative
550 DisclosureOfFinancialRiskManagementTable [Table] Table

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 NDM:DisclosureOfFinancialRiskManagementTable
551 Financial instruments measured at fair value through profit or loss because credit derivative is used to manage credit risk [axis] Axis ifrs-full:FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis
552 Financial instruments measured at fair value through profit or loss because credit derivative is used to manage credit risk [member] Member ifrs-full:FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskMember
553 Foreign Exchange Risk [Member] Member NDM:ForeignExchangeRiskMember
554 DisclosureOfFinancialRiskManagementLineItems [Line Items] LineItems NDM:DisclosureOfFinancialRiskManagementLineItems
555 Foreign exchange risk, percent Concept (Percent) For Period NDM:ForeignExchangeRiskPercent
556 Gain (Loss) on foreign exchange Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
557 Increase decrease in interest rates, percentage Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
558 Increase decrease in foreign exchange loss Concept (Monetary) For Period Debit ifrs-full:NetForeignExchangeLoss
559 00000066 - Disclosure - Financial Risk Management - Schedule of Financial Assets and Liabilities (Details) Network

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 http://northerndynastyminerals.com/role/FinancialRiskManagement-ScheduleOfFinancialAssetsAndLiabilitiesDetails
560 Statement Table [Table] Table

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 NDM:IfrsStatementTable
561 Financial instruments measured at fair value through profit or loss because credit derivative is used to manage credit risk [axis] Axis ifrs-full:FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis
562 Financial instruments measured at fair value through profit or loss because credit derivative is used to manage credit risk [member] Member ifrs-full:FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskMember
563 Credit Risk [Member] Member ifrs-full:CreditRiskMember
564 Foreign Exchange Risk [Member] Member NDM:ForeignExchangeRiskMember
565 Statement Line Items [Line Items] LineItems NDM:IfrsStatementLineItems
566 Amounts receivable Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
567 Restricted cash Concept (Monetary) As Of Debit ifrs-full:RestrictedCashAndCashEquivalents
568 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
569 Cash and cash equivalents and restricted cash Concept (Monetary) As Of Debit NDM:CashAndCashEquivalentsAndRestrictedCash
570 Total exposure Concept (Monetary) As Of Debit NDM:FinancialAssetsExposure
571 Total Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
572 Non-current trade payables Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayables
573 Current trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
574 Payables to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesToRelatedParties
575 Total Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
576 Net financial (liabilities) assets exposed to foreign currency risk Concept (Monetary) As Of Debit NDM:NetFinancialAssetsExposedToForeignCurrencyRisk
577 00000067 - Disclosure - Commitments and Contingencies - Schedule of Maturity of Leases (Details) Network

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 http://northerndynastyminerals.com/role/CommitmentsAndContingencies-ScheduleOfMaturityOfLeasesDetails
578 Statement Table [Table] Table

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 NDM:IfrsStatementTable
579 Maturity [axis] Axis ifrs-full:MaturityAxis
580 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
581 Less Than 1 Year [Member] Member ifrs-full:NotLaterThanOneYearMember
582 Between 1 and 5 Years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
583 Later Than 5 Years [Member] Member ifrs-full:LaterThanFiveYearsMember
584 Arrangements involving legal form of lease [axis] Axis ifrs-full:ArrangementsInvolvingLegalFormOfLeaseAxis
585 Arrangements involving legal form of lease [member] Member ifrs-full:ArrangementsInvolvingLegalFormOfLeaseMember
586 Anchorage Office Lease [Member] Member NDM:AnchorageOfficeLeaseMember
587 Pebble Project Site Leases [Member] Member NDM:PebbleProjectSiteLeasesMember
588 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
589 Risks [member] Member ifrs-full:TypesOfRisksMember
590 U.S. $ [Member] Member NDM:USMember
591 Statement Line Items [Line Items] LineItems NDM:IfrsStatementLineItems
592 Total Concept (Monetary) As Of Credit ifrs-full:LeaseLiabilities
593 Total in Canadian dollars Concept (Monetary) As Of Credit NDM:LeaseLiabilitiesTotal
594 00000068 - Disclosure - Commitments and Contingencies - Schedule of Maturity of Leases (Details) (Parenthetical) Network

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 http://northerndynastyminerals.com/role/CommitmentsAndContingencies-ScheduleOfMaturityOfLeasesDetailsParenthetical
595 CapitalCommitmentsTable [Table] Table

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 NDM:CapitalCommitmentsTable
596 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
597 Risks [member] Member ifrs-full:TypesOfRisksMember
598 U.S. $ [Member] Member NDM:USMember
599 CapitalCommitmentsLineItems [Line Items] LineItems NDM:CapitalCommitmentsLineItems
600 Conversion price per dollar Concept (Share) As Of NDM:ConversionPricePerDollar

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