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Additional information on the consolidated statements of loss (Tables)
 12 Months Ended
Dec. 31, 2019
Additional Information On Consolidated Statements Of Loss Abstract  
Disclosure of detailed information about consolidated statements of loss [Table Text Block]

    2019     2018  
    $     $  
Revenues            
             
Royalty interests   97,146     92,110  
Stream interests   42,976     35,457  
Offtake interests   252,477     362,905  
    392,599     490,472  
             
Cost of sales            
             
Royalty interests   272     245  
Stream interests   13,437     13,181  
Offtake interests   249,172     357,879  
    262,881     371,305  

Operating expenses by nature            
             
Impairment of assets   243,576     166,316  
Depletion and depreciation   48,270     52,786  
Employee benefit expenses (see next page)   20,701     14,015  
Professional fees   3,453     3,827  
Travel expenses   1,108     1,363  
Communication and promotional expenses   1,006     1,166  
Rent and office expenses   828     1,704  
Public company expenses   822     639  
Gain on disposal of stream and offtake interests   (7,636 )   (9,094 )
Cost recoveries from associates   (595 )   (677 )
Other expenses   1,411     653  
    312,944     232,698  
Employee benefit expenses            
             
Salaries and wages   15,122     12,705  
Share-based compensation   8,328     5,791  
Cost recoveries from associates   (2,749 )   (4,481 )
    20,701     14,015  

             
    2019     2018  
    $     $  
Other gains (losses), net            
             
Change in fair value of financial assets at fair value through profit and loss   (1,089 )   (7,837 )
Net gain (loss) on dilution of investments in associates   (3,687 )   1,545  
Net gain on acquisition of investments(i)   1,006     1,934  
Net gain (loss) on disposal of investments(ii)   (27,391 )   6,956  
Impairment of an investment in an associate (Note 12)   (12,500 )   -  
Impairment of other assets   (4,724 )   -  
    (48,385 )   2,598  

(i) Represents changes in the fair value of the underlying investments between the respective subscription dates and the closing dates.

(ii) In 2019, the net loss on disposal of investments includes the net losses realized on the deemed disposal of associates (Note 12). In 2018, the net gain on disposal of investments includes the gain realized on the deemed disposal of the Dalradian shares (Note 13).