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Fair value of financial instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of fair value measurement of assets [abstract]  
Disclosure of significant observable inputs used in fair value measurement [Table Text Block]
                December 31, 2021  
    Level 1     Level 2     Level 3     Total  
    $     $     $     $  
                         
Recurring measurements                        
                         
Financial assets at fair value through profit or loss(i)                        
Warrants on equity securities and convertible debentures and notes                        
Publicly traded mining exploration and development companies                        
Precious metals   -     -     24,327     24,327  
Other minerals   13,048     -     10,607     23,655  
Financial assets at fair value through other comprehensive (loss) income(i)                        
Equity securities                        
Publicly traded mining exploration and development companies                        
Precious metals   46,668     -     -     46,668  
Other minerals   47,563     -     -     47,563  
    107,279     -     34,934     142,213  
                   
                December 31, 2020  
    Level 1     Level 2     Level 3     Total  
    $     $     $     $  
                         
Recurring measurements                        
                         
Financial assets at fair value through profit or loss(i)                        
Warrants on equity securities and convertible debentures and notes                        
Publicly traded mining exploration and development companies                        
Precious metals   -     -     23,904     23,904  
Other minerals   -     -     1,159     1,159  
Financial assets at fair value through other comprehensive (loss) income (i)                        
Equity securities                        
Publicly traded mining exploration and development companies                        
Precious metals   95,796     -     -     95,796  
Other minerals   19,794     -     -     19,794  
    115,590     -     25,063     140,653  

(i) On the basis of its analysis of the nature, characteristics and risks of equity securities, the Company has determined that presenting them by industry and type of investment is appropriate.
Disclosure of detailed information about changes in fair value of level 3 investments [Table Text Block]
    2021     2020  
    $     $  
Balance - January 1   25,063     1,700  
Acquisitions   12,754     4,782  
Amendment of a note receivable (Note 13)   -     16,541  
Warrants exercised   (1,122 )   (347 )
Change in fair value - warrants exercised(i)   300     102  
Change in fair value - warrants expired(i)   (15 )   (48 )
Change in fair value - investments held at the end of the period(i)   (2,046 )   2,333  
Balance - December 31   34,934     25,063  

(i) Recognized in the consolidated statements of income (loss) under other gains (losses), net.
Disclosure of detailed information about fair value of long-term debt [Table Text Block]
          December 31, 2021           December 31, 2020  
    Fair     Carrying     Fair     Carrying  
    value     amount     value     amount  
    $     $              
Long-term debt - Level 1   303,000     293,281     318,000     286,903  
Long-term debt - Level 2   -     -     49,928     49,866  
Balance   303,000     293,281     367,928     336,769