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Royalty, stream and other interests (Tables)
 12 Months Ended
Dec. 31, 2019
Royalty, Stream And Other Interests [Abstract]  
Disclosure of detailed information about royalty interests [Table Text Block]
            2019  
      Royalty
interests		     Stream
interests		     Offtake
interests		     Total  
      $     $     $     $  
Balance - January 1   707,723     606,410     100,535     1,414,668  
  Acquisitions   41,529     48,573     -     90,102  
  NSR royalty on the Cariboo properties owned prior
    to the acquisition of Barkerville (Note 7)		   (56,070 )   -     -     (56,070 )
  Transfer   (10,000 )   10,000     -     -  
  Disposal   (2,277 )   -     (47,116 )   (49,393 )
  Depletion   (20,908 )   (23,335 )   (2,766 )   (47,009 )
  Impairment   (27,689 )   (138,689 )   (27,213 )   (193,591 )
  Translation adjustments   (4,741 )   (19,795 )   (3,659 )   (28,195 )
 
Balance - December 31		   627,567     483,164     19,781     1,130,512  
                           
  Producing                        
    Cost   604,950     509,179     18,792     1,132,921  
    Accumulated depletion and impairment   (345,521 )   (141,826 )   (13,001 )   (500,348 )
    Net book value - December 31   259,429     367,353     5,791     632,573  
                             
  Development                        
    Cost   185,636     168,290     31,881     385,807  
    Accumulated depletion and impairment   -     (52,479 )   (27,070 )   (79,549 )
    Net book value - December 31   185,636     115,811     4,811     306,258  
                             
  Exploration and evaluation                        
    Cost   182,502     -     9,179     191,681  
    Accumulated depletion   -     -     -     -  
    Net book value - December 31   182,502     -     9,179     191,681  
 
Total net book value - December 31		   627,567     483,164     19,781     1,130,512  
 
              2018  
        Royalty
interests		     Stream interests     Offtake interests     Total  
        $     $     $     $  
Balance - January 1   770,530     700,078     105,164     1,575,772  
    Acquisitions   109,670     31,431     -     141,101  
    Conversion   -     4,278     (4,278 )   -  
    Disposal   -     (150,289 )   -     (150,289 )
    Depletion   (26,972 )   (21,217 )   (4,423 )   (52,612 )
    Impairment   (153,639 )   -     (4,561 )   (158,200 )
    Translation adjustments   8,134     42,129     8,633     58,896  
 
Balance - December 31		   707,723     606,410     100,535     1,414,668  
                             
  Producing                        
    Cost   510,738     489,407     68,072     1,068,217  
    Accumulated depletion and impairment   (297,137 )   (33,502 )   (10,665 )   (341,304 )
    Net book value - December 31   213,601     455,905     57,407     726,913  
                             
  Development                        
    Cost   270,066     150,505     33,486     454,057  
    Accumulated depletion   -     -     -     -  
    Net book value - December   270,066     150,505     33,486     454,057  
                             
  Exploration and evaluation                        
    Cost   224,056     -     9,642     233,698  
    Accumulated depletion   -     -     -     -  
    Net book value - December 31   224,056     -     9,642     233,698  
 
Total net book value - December 31		   707,723     606,410     100,535     1,414,668