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Exploration and evaluation (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of Exploration and evaluation assets [Abstract]  
Disclosure of detailed information about exploration assets [Table Text Block]
    2021     2020  
    $     $  
             
Net book value - January 1   42,519     42,949  
Additions   3,784     201  
Impairment   (42,668 )   -  
Transfer to royalty, stream and other interests   -     (631 )
Net book value - December 31   3,635     42,519  
             
Closing balance            
Cost   104,492     100,708  
Accumulated impairments   (100,857 )   (58,189 )
Net book value   3,635     42,519