POLYMET MINING CORP (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

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6 Document Type Concept (Submission Type) For Period dei:DocumentType
7 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
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21 Amounts receivable Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
22 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
23 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
24 Non-Current Abstract ifrs-full:NoncurrentAssetsAbstract
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26 Amounts receivable Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivables
27 Mineral Property, Plant and Equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
28 Intangible Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
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34 Non-convertible debt Concept (Monetary) As Of Credit PLM:NonConvertibleDebtInstrumentCurrent
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45 Total Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:Equity
46 Total Liabilities and Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
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62 Loss on modification of debentures Concept (Monetary) For Period Debit PLM:LossOnModificationOfDebentures
63 Loss on land exchange Concept (Monetary) For Period Debit PLM:LossOnLandExchange
64 Gain on disposal of financial instrument Concept (Monetary) For Period Credit ifrs-full:CumulativeGainLossOnDisposalOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncome
65 Loss on disposal of intangible Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill
66 Loss on disposal of lands Concept (Monetary) For Period Debit PLM:LossOnDisposalOfLands
67 Loss on financial instrument fair value Concept (Monetary) For Period Debit ifrs-full:LossesOnChangeInFairValueOfDerivatives
68 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
69 Total Other Expenses Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
70 Loss for the Period Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
71 Other Comprehensive Loss Abstract ifrs-full:OtherComprehensiveIncomeAbstract
72 Reclass on disposal of financial instrument Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments
73 Items that may be subsequently reclassified to profit or loss: Abstract ifrs-full:OtherComprehensiveIncomeBeforeTaxNetMovementInRegulatoryDeferralAccountBalancesRelatedToItemsThatWillBeReclassifiedToProfitOrLossAbstract
74 Unrealized loss on financial instrument Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxNetMovementInRegulatoryDeferralAccountBalancesRelatedToItemsThatWillBeReclassifiedToProfitOrLoss
75 Other Comprehensive Loss for the Period Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax
76 Total Comprehensive Loss for the Period - Net of Tax Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
77 Basic and Diluted Loss per Share Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
78 Weighted Average Number of Shares - basis and diluted Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
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82 Equity [member] Member ifrs-full:EquityMember
83 Shares Capital [Member] Member ifrs-full:IssuedCapitalMember
84 Share Premium [Member] Member ifrs-full:SharePremiumMember
85 Contributed Surplus [Member] Member ifrs-full:RevaluationSurplusMember
86 Accumulated Other Comp Inc / (Loss) [Member] Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
87 Equity Reserves [Member] Member ifrs-full:CapitalReserveMember
88 Deficit [Member] Member ifrs-full:RetainedEarningsMember
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90 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
91 Balance share Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
92 Total comprehensive loss for the period Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
93 Debenture refinancing warrants Concept (Monetary) For Period Credit PLM:DebentureRefinancingWarrants
94 Private placement and issuance costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
95 Private placement and issuance costs, shares Concept (Shares) For Period PLM:PrivatePlacementAndIssuanceCostsShares
96 Refinance of debentures Concept (Monetary) For Period Credit PLM:IncreaseDecreasethroughRefinanceOfDebenturesEquity
97 Payment of land purchase options Concept (Monetary) For Period Credit PLM:DecreaseThroughPaymentOfLandPurchaseOptionsEquity
98 Payment of land purchase options, shares Concept (Shares) For Period PLM:DecreaseThroughPaymentOfLandPurchaseOptionsEquityShares
99 Exercise of share options Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
100 Exercise of share options, shares Concept (Shares) For Period PLM:IncreaseDecreaseThroughSharesExerciseOfOptions
101 Exercise of warrants Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfWarrantsEquity
102 Exercise of warrants, shares Concept (Shares) For Period PLM:IncreaseDecreaseThroughExerciseOfWarrantsEquityShares
103 Vesting of restricted shares and RSU's Concept (Monetary) For Period Credit PLM:VestingOfRestrictedSharesAndRestrictedStockUnitEquity
104 Vesting of restricted shares and RSU's, shares Concept (Shares) For Period PLM:VestingOfRestrictedSharesAndRestrictedStockUnitEquityShares
105 Share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
106 Share-based compensation, shares Concept (Shares) For Period PLM:IncreaseDecreaseThroughSharebasedPaymentTransactionsShares
107 Bonus share cost amortization (forfeiture) Concept (Monetary) For Period Credit PLM:IncreaseDecreaseDuringPeriodBonusShareCostAmortizationEquity
108 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
109 Balance share Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
110 00000005 - Statement - Consolidated Statements of Cash Flows Network

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112 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
113 Operating Activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
114 Loss for the period Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
115 Items not involving cash: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
116 Depreciation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
117 Environmental rehabilitation provision accretion Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
118 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
119 Unrealized loss on foreign exchange Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
120 Loss on modification of debentures Concept (Monetary) For Period Debit PLM:LossOnModificationOfDebentures
121 Loss on land exchange Concept (Monetary) For Period Debit PLM:LossOnLandExchange
122 Loss on disposal of intangible Concept (Monetary) For Period Credit PLM:AdjustmentsForGainLossOnDisposalsIntangibleAssets
123 Loss on disposal of lands Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
124 Gain on disposal of financial instrument Concept (Monetary) For Period Credit ifrs-full:GainLossOnDesignationOfFinancialInstrumentAsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRisk
125 Loss on financial instrument fair value Concept (Monetary) For Period Debit ifrs-full:LossesOnChangeInFairValueOfDerivatives
126 Changes in non-cash working capital: Abstract PLM:ChangesInAssetAndLiabilityItemsAbstract
127 Amounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
128 Prepaid expenses Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherCurrentAssets
129 Accounts payable and accruals Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable
130 Net cash used in operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
131 Financing Activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
132 Share issuance proceeds, net of costs Concept (Monetary) For Period Credit ifrs-full:PaymentsForShareIssueCosts
133 Debenture funding, net of costs Concept (Monetary) For Period Credit ifrs-full:PaymentsForDebtIssueCosts
134 RSU's settled for cash Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities
135 Net cash provided by financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
136 Investing Activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
137 Property, plant and equipment purchases Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
138 Intangible purchases Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
139 Financial instrument disposal proceeds Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities
140 Land disposal proceeds Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets
141 Restricted cash deposits Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents
142 Net cash used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
143 Net Increase (Decrease) in Cash Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
144 Effect of foreign exchange on Cash Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
145 Cash - Beginning of period Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
146 Cash - End of period Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
147 Supplemental information - non-cash investing and financing Abstract PLM:SupplementaryInformationOnInvestingAndFinancingActivitiesNotInvolvingCashFlowsAbstract
148 Accounts payable and accruals Concept (Monetary) For Period Debit PLM:AccountsPayableAndAccrualsNonCashItems
149 Transfer from PP&E to Intangible Concept (Monetary) For Period Debit PLM:TransferFromPropertyPlanAndEquipmentToIntangiblesNonCash
150 Debt accretion and capitalized interest Concept (Monetary) For Period Debit PLM:DebtAccretionAndCapitalizedInterestNonCash
151 Share-based compensation Concept (Monetary) For Period Debit PLM:SharebasedCompensationNonCash
152 Bonus share amortization and forfeiture Concept (Monetary) For Period Debit PLM:BonusShareAmortizationNonCash
153 Fair value of shares issued for land options Concept (Monetary) For Period Debit PLM:FairValueOfSharesIssuedForLandOptionsNonCash
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539 Warrant [Member] Member PLM:WarrantsMember
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542 Expected dividend yield Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
543 Expected forfeiture rate Concept (Percent) For Period PLM:ExpectedForfeiturerateShareOptionsGranted
544 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
545 Expected life in years Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
546 Weighted average fair value of each option Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
547 00000054 - Disclosure - Share Capital (Schedule of Stock Options Outstanding and Exercisable) (Details) Network

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 http://polymetmining.com/role/ShareCapitalScheduleOfStockOptionsOutstandingAndExercisableDetails
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 ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable
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551 0.61 to 0.80 [Member] Member PLM:RangeOneMember
552 0.80 to 1.00 [Member] Member PLM:RangeTwoMember
553 1.00 to 1.50 [Member] Member PLM:RangeThreeMember
554 1.50 to 2.00 [Member] Member PLM:RangeFourMember
555 2.00 to 3.07 [Member] Member PLM:RangeFiveMember
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557 Range of Exercise Prices Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
558 Number of options outstanding Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
559 Number of options Exercisable Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
560 Expiry Date Concept (Text/String) For Period PLM:ExpiryDate
561 Weighted Average Exercise Price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
562 Weighted Average Remaining Life Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
563 00000055 - Disclosure - Share Capital (Schedule of Restricted Shares And Share Purchase Warrant Activities) (Details) Network

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 http://polymetmining.com/role/ShareCapitalScheduleOfRestrictedSharesAndSharePurchaseWarrantActivitiesDetails
564 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
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567 RestrictedShareUnit (RSU) [Member] Member PLM:RestrictedShareUnitMember
568 Warrant [Member] Member PLM:WarrantsMember
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571 Issued Concept (Decimal) For Period PLM:NumberOfShareOptionsIssuedInSharebasedPaymentArrangement
572 Forfeited Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
573 Vested Concept (Decimal) For Period PLM:NumberOfShareOptionsVestedInSharebasedPaymentArrangement
574 Exercised Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
575 Expired Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExpiredInSharebasedPaymentArrangement
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577 Weighted average exercise price outstanding at December 31, 2018 Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
578 Issued Concept (Monetary) For Period Debit PLM:WeightedAverageExercisePriceOfShareOptionsIssuedInSharebasedPaymentArrangement
579 Forfeited Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
580 Vested Concept (Monetary) For Period Debit PLM:WeightedAverageExercisePriceOfShareOptionsVestedInSharebasedPaymentArrangement
581 Excercised Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
582 Expired Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement
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 http://polymetmining.com/role/ShareCapitalScheduleOfBonusShareDetails
585 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
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587 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
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589 Unissued Bonus Shares [Member] Member PLM:UnissuedBonusSharesMember
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591 Outstanding share authorized Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
592 Forfeited Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
593 Outstanding share authorized Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
594 00000057 - Disclosure - Finance Costs - Net (Schedule of Finance Costs Net) (Details) Network

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 http://polymetmining.com/role/FinanceCosts-NetScheduleOfFinanceCostsNetDetails
595 Implied Table Table

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597 Debt accretion and capitalized interest: Abstract PLM:DebtAccretionAndCapitalizedInterestAbstract
598 Convertible debt (Notes 8) Concept (Monetary) For Period Debit PLM:IncreaseDecreaseInConvertibleDebtAndCapitalizedInterest
599 Non-convertible debt (Notes 9) Concept (Monetary) For Period Debit PLM:IncreaseDecreaseInNonconvertibleDebt
600 Environmental rehabilitation provision accretion (Note 6) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
601 Other finance costs Concept (Monetary) For Period Debit PLM:OtherFinanceCosts
602 Less: amounts capitalized on qualifying assets Concept (Monetary) For Period Credit PLM:AmountsCapitalizedOnQualifyingAssets
603 Finance costs Concept (Monetary) For Period Debit PLM:FinanceCostsGross
604 Interest income: Abstract ifrs-full:InterestIncomeOnImpairedFinancialAssetsAccruedAbstract
605 Bank deposits Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDepositsFromBanks
606 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
607 Finance costs - net Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
608 00000058 - Disclosure - Related Party Transactions (Narriative) (Details) Network

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609 Disclosure of transactions between related parties [table] Table

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612 Technical Services Agreement [Member] Member PLM:TechnicalServicesAgreementMember
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614 Services received Concept (Monetary) For Period Debit ifrs-full:ServicesReceivedRelatedPartyTransactions
615 00000059 - Disclosure - Related Party Transactions (Schedule of Key Management Personnel Compensation) (Details) Network

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 http://polymetmining.com/role/RelatedPartyTransactionsScheduleOfKeyManagementPersonnelCompensationDetails
616 Implied Table Table

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617 Related party transactions [abstract] Abstract ifrs-full:RelatedPartyTransactionsAbstract
618 Salaries and other short-term benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
619 Other long-term benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationOtherLongtermBenefits
620 Share-based payment Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
621 Total Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
622 00000060 - Disclosure - Income Taxes (Schedule of Reconciliation of Effective Income Tax Rate) (Details) Network

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 http://polymetmining.com/role/IncomeTaxesScheduleOfReconciliationOfEffectiveIncomeTaxRateDetails
623 Implied Table Table

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 implied:Table
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626 Canadian statutory tax rate Concept (Percent) For Period ifrs-full:TaxRateEffectOfForeignTaxRates
627 Expected tax recovery Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfTaxLosses
628 Difference in foreign tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
629 Non-deductible items Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
630 Change in tax rate Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
631 Change in unrecognized deferred tax and other items Concept (Monetary) For Period Debit PLM:ChangeInUnrecognizedDeductibleTemporaryDifferences
632 Income Tax Expense / (Recovery) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
633 00000061 - Disclosure - Income Taxes (Schedule of Components of Deferred Tax Assets And Liabilities) (Details) Network

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 http://polymetmining.com/role/IncomeTaxesScheduleOfComponentsOfDeferredTaxAssetsAndLiabilitiesDetails
634 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
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637 Non-capital loss [Member] Member ifrs-full:UnusedTaxLossesMember
638 Property and equipment [Member] Member ifrs-full:PropertyPlantAndEquipmentMember
639 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
640 Non-capital loss carry forward assets Concept (Monetary) As Of Credit PLM:NonCapitalLossCarryForwardDeferredTaxAssets
641 Mineral property acquisition, exploration and development costs Concept (Monetary) As Of Credit PLM:MineralPropertyAcquisitionExplorationAndDevelopmentCostsDeferredTax
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643 Net deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
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 http://polymetmining.com/role/IncomeTaxesScheduleOfUnrecognizedDeferredIncomeTaxAssetsDetails
645 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
646 Temporary difference, unused tax losses and unused tax credits [Axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
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652 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
653 Unrecognized deferred income tax assets Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
654 Expiry date Concept (Text/String) For Period ifrs-full:DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits
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 http://polymetmining.com/role/CommitmentsAndContingenciesScheduleOfContractualObligationsDetails
657 Disclosure of finance lease and operating lease by lessee [table] Table

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 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
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661 Contractual Cash Flow [Member] Member PLM:ContractualCashFlowMember
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667 LMC Minerals Year 5+ [Member] Member ifrs-full:LaterThanFiveYearsMember
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671 Non-convertible debt (Note 9) Concept (Monetary) As Of Credit PLM:NonConvertibleDebtInstrumentCurrent
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673 Total Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
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675 00000064 - Disclosure - Financial Instruments and Risk Management (Schedule of Financial Instrument) (Details) Network

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676 Disclosure of information about credit exposures designated as measured at fair value through profit or loss [table] Table

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685 Cash and Restricted Cash Deposits Concept (Monetary) As Of Debit ifrs-full:RestrictedCashAndCashEquivalents
686 Amounts receivable Concept (Monetary) As Of Debit ifrs-full:InterestReceivable
687 Total financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
688 Financial liabilities Abstract PLM:FinancialLiabilitiesAbstract
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693 00000065 - Disclosure - Financial Instruments and Risk Management (Schedule of Interest Rate Risk) (Details) Network

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694 Disclosure of risk management strategy related to hedge accounting [table] Table

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702 Net carrying value of debt Concept (Monetary) For Period Credit ifrs-full:ChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
703 Foreign currency net monetary asset position Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationNetOfTax
704 Each 1% change in US dollar to Canadian dollar foreign exchange gain/loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInValueOfForeignCurrencyBasisSpreadsNetOfTax
705 Maximum exposure to credit risk Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
706 00000066 - Disclosure - Subsequent Event (Details) Network

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707 Disclosure of non-adjusting events after reporting period [table] Table

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711 Categories Of Related Parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
712 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
713 Glencore [Member] Member PLM:GlencoreMember
714 Disclosure of non-adjusting events after reporting period [line items] LineItems ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
715 Common stock called by warrant Concept (Shares) As Of PLM:NumberOfSecuritiesCalledByWarrants

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