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Flow-through Share Premium Liability (Tables)
 12 Months Ended
Dec. 31, 2020
September 22, 2017 [member]  
Disclosure of flow-through share liability activity
    Flow-through funding and expenditures     Flow-through  
    Québec     Nunavut     British Columbia     Total     premium liability  
Balance at December 31, 2018   $ -     $ 433     $ 737     $ 1,170     $ 317  
Flow-through funds raised     -       1,900       -       1,900       557  
Flow-through eligible expenditures     -       (2,309 )     (737 )     (3,046 )     (867 )
Balance at December 31, 2019   $ -     $ 24     $ -     $ 24     $ 7  
Flow-through liability assumed     2,391       -       -       2,391       590  
Flow-through funds raised     17,500       -       -       17,500       7,500  
Flow-through eligible expenditures     (1,812 )     (24 )     -       (1,836 )     (453 )
Balance at December 31, 2020   $ 18,079     $ -     $ -     $ 18,079     $ 7,644