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Mineral Property Interests (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfMineralPropertyInterestsLineItems [Line Items]    
Balance, beginning of the year $ 39,714 $ 39,072
Additions   960
Eastmain acquisition, mineral property interests acquired 125,606  
Impairment of mineral property interests   (337)
Option payment received (252)  
Dispositions (8,949)  
Change in estimate of provision for site reclamation and closure 273 203
Currency translation adjustment 134 (184)
Balance, end of the year 160,772 39,714
Québec    
DisclosureOfMineralPropertyInterestsLineItems [Line Items]    
Balance, beginning of the year 0 0
Additions   0
Eastmain acquisition, mineral property interests acquired 125,606  
Impairment of mineral property interests   0
Option payment received (252)  
Dispositions 0  
Change in estimate of provision for site reclamation and closure 0 0
Currency translation adjustment 0 0
Balance, end of the year 125,354 0
Nunavut    
DisclosureOfMineralPropertyInterestsLineItems [Line Items]    
Balance, beginning of the year 19,085 18,871
Additions   11
Eastmain acquisition, mineral property interests acquired 0  
Impairment of mineral property interests   0
Option payment received 0  
Dispositions 0  
Change in estimate of provision for site reclamation and closure 273 203
Currency translation adjustment 0 0
Balance, end of the year 19,358 19,085
British Columbia    
DisclosureOfMineralPropertyInterestsLineItems [Line Items]    
Balance, beginning of the year 16,060 16,060
Additions   0
Eastmain acquisition, mineral property interests acquired 0  
Impairment of mineral property interests   0
Option payment received 0  
Dispositions 0  
Change in estimate of provision for site reclamation and closure 0 0
Currency translation adjustment 0 0
Balance, end of the year 16,060 16,060
Peru    
DisclosureOfMineralPropertyInterestsLineItems [Line Items]    
Balance, beginning of the year 4,569 4,141
Additions   949
Eastmain acquisition, mineral property interests acquired 0  
Impairment of mineral property interests   (337)
Option payment received 0  
Dispositions (8,949)  
Change in estimate of provision for site reclamation and closure 0 0
Currency translation adjustment 134 (184)
Balance, end of the year $ 0 $ 4,569