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Provision for Site Reclamation and Closure (Tables)
 12 Months Ended
Dec. 31, 2020
Provision For Site Reclamation And Closure  
Disclosure of site reclamation and closure provision
    Québec     Committee Bay     Total  
Balance at December 31, 2018   $ -     $ 1,891     $ 1,891  
Accretion     -       40       40  
Change in estimate     -       203       203  
Balance at December 31, 2019   $ -     $ 2,134     $ 2,134  
Provision, assumed on acquisition of Eastmain (note 4ii)     1,849       -       1,849  
Accretion     5       29       34  
Change in estimate     -       273       273  
Balance at December 31, 2020   $ 1,854     $ 2,436     $ 4,290