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Royalty, stream and other interests (Tables)
 12 Months Ended
Dec. 31, 2021
Royalty, Stream And Other Interests [Abstract]  
Disclosure of detailed information about royalty interests [Table Text Block]
                      Year ended  
                December 31, 2021  
    Royalty     Stream     Offtake        
    interests     interests     interests     Total  
    $     $     $     $  
Balance - January 1   656,661     440,941     18,526     1,116,128  
Additions   77,702     13,234     -     90,936  
Conversion of an offtake into a stream   -     4,682     (4,682 )   -  
Depletion   (28,958 )   (19,403 )   -     (48,361 )
Impairment   (2,288 )   -     -     (2,288 )
Translation adjustments   (4 )   (1,422 )   (188 )   (1,614 )
                         
Balance - December 31   703,113     438,032     13,656     1,154,801  
                         
Producing                        
Cost   626,345     518,934     -     1,145,279  
Accumulated depletion and impairment   (395,874 )   (210,884 )   -     (606,758 )
Net book value - December 31   230,471     308,050     -     538,521  
                         
Development                        
Cost   226,438     181,209     31,120     438,767  
Accumulated depletion and impairment   (572 )   (51,227 )   (26,424 )   (78,223 )
Net book value - December 31   225,866     129,982     4,696     360,544  
                         
Exploration and evaluation                        
Cost   247,680     -     8,960     256,640  
Accumulated depletion   (904 )   -     -     (904 )
Net book value - December 31   246,776     -     8,960     255,736  
                         
Total net book value - December 31   703,113     438,032     13,656     1,154,801  
                      Year ended  
                December 31, 2020  
    Royalty     Stream     Offtake        
    interests     interests     interests     Total  
    $     $     $     $  
Balance - January 1   627,567     483,164     19,781     1,130,512  
Additions   54,276     11,917     -     66,193  
Disposal   (357 )   -     -     (357 )
Depletion   (23,159 )   (21,532 )   (914 )   (45,605 )
Impairment   -     (26,300 )   -     (26,300 )
Translation adjustments   (1,666 )   (6,308 )   (341 )   (8,315 )
                         
Balance - December 31   656,661     440,941     18,526     1,116,128  
                         
Producing                        
Cost   621,503     512,019     18,422     1,151,944  
Accumulated depletion and impairment   (367,232 )   (188,281 )   (13,609 )   (569,122 )
Net book value - December 31   254,271     323,738     4,813     582,822  
                         
Development                        
Cost   185,170     168,648     31,252     385,070  
Accumulated depletion and impairment   (501 )   (51,445 )   (26,537 )   (78,483 )
Net book value - December 31   184,669     117,203     4,715     306,587  
                         
Exploration and evaluation                        
Cost   218,395     -     8,998     227,393  
Accumulated depletion   (674 )   -     -     (674 )
Net book value - December 31   217,721     -     8,998     226,719  
                         
Total net book value - December 31   656,661     440,941     18,526     1,116,128