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Provision for Site Reclamation and Closure (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Balance, beginning of the year $ 2,134 $ 1,891
Provision, assumed on acquisition of Eastmain 1,849  
Accretion 34 40
Change in estimate 273 203
Balance, end of the year 4,290 2,134
Québec    
Disclosure of other provisions [line items]    
Balance, beginning of the year 0 0
Provision, assumed on acquisition of Eastmain 1,849  
Accretion 5 0
Change in estimate 0 0
Balance, end of the year 1,854 0
Committee Bay    
Disclosure of other provisions [line items]    
Balance, beginning of the year 2,134 1,891
Provision, assumed on acquisition of Eastmain 0  
Accretion 29 40
Change in estimate 273 203
Balance, end of the year $ 2,436 $ 2,134