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Flow-through Share Premium Liability (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfFlowThroughSharePremiumLiabilityLineItems [Line Items]    
Balance, beginning of the year $ 7 $ 317
Flow-through liability assumed 590  
Flow-through funds raised 7,500 557
Flow-through eligible expenditures (453) (867)
Balance, end of the year 7,644 7
Québec    
DisclosureOfFlowThroughSharePremiumLiabilityLineItems [Line Items]    
Balance, beginning of the year 0 0
Flow-through liability assumed 2,391  
Flow-through funds raised 17,500 0
Flow-through eligible expenditures (1,812) 0
Balance, end of the year 18,079 0
Nunavut    
DisclosureOfFlowThroughSharePremiumLiabilityLineItems [Line Items]    
Balance, beginning of the year 24 433
Flow-through liability assumed 0  
Flow-through funds raised 0 1,900
Flow-through eligible expenditures (24) (2,309)
Balance, end of the year 0 24
British Columbia    
DisclosureOfFlowThroughSharePremiumLiabilityLineItems [Line Items]    
Balance, beginning of the year 0 737
Flow-through liability assumed 0  
Flow-through funds raised 0 0
Flow-through eligible expenditures 0 (737)
Balance, end of the year 0 0
Total    
DisclosureOfFlowThroughSharePremiumLiabilityLineItems [Line Items]    
Balance, beginning of the year 24 1,170
Flow-through liability assumed 2,391  
Flow-through funds raised 17,500 1,900
Flow-through eligible expenditures (1,836) (3,046)
Balance, end of the year $ 18,079 $ 24