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Fair value of financial instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of fair value measurement of assets [abstract]  
Disclosure of significant observable inputs used in fair value measurement of equity [Table Text Block]
                  December 31, 2019  
      Level 1     Level 2     Level 3     Total  
      $     $     $     $  
Recurring measurements                        
                           
Financial assets at fair value through profit or loss(i)                    
Warrants on equity securities                        
  Publicly traded mining exploration and development companies                        
  Precious metals   -     -     1,067     1,067  
  Other minerals   -     -     633     633  
Financial assets at fair value through other                        
  comprehensive income (loss)(i)                        
Equity securities                        
  Publicly traded mining exploration and development companies                        
  Precious metals   48,295     -     -     48,295  
  Other minerals   9,114     -     -     9,114  
      57,409     -     1,700     59,109  
 
                  December 31, 2018  
      Level 1     Level 2     Level 3     Total  
      $     $     $     $  
Recurring measurements                        
                           
Financial assets at fair value through profit or loss(i)                    
Warrants on equity securities                        
  Publicly traded mining exploration and development companies                        
  Precious metals   -     -     3,322     3,322  
  Other minerals   -     -     26     26  
Financial assets at fair value through other                        
  comprehensive income (loss)(i)                        
Equity securities                        
  Private mining exploration and development
        companies - precious metals		   -     -     56,252     56,252  
  Publicly traded mining exploration and development
companies		                        
  Precious metals   35,544     -     -     35,544  
  Other minerals   12,259     -     -     12,259  
      47,803     -     59,600     107,403  

(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 investments [Table Text Block]
      2019     2018  
      $     $  
               
Balance - January 1   59,600     8,092  
  Acquisitions   2,885     3,093  
  Deemed acquisition (Note 13)   -     46,625  
  Disposal (Note 21)   (58,641 )   -  
  Warrants exercised   (1,055 )   -  
  Change in fair value - warrants exercised(i)   (250 )   -  
  Change in fair value - warrants expired(i)   (165 )   (1,180 )
  Change in fair value - investments held at the end of the period(i)   (674 )   2,970  
Balance - December 31   1,700     59,600  
 

(i)  Recognized in the consolidated statements of loss under other losses, net for the warrants and in the consolidated statements of other comprehensive loss under changes in fair value of financial assets at fair value through comprehensive income (loss) for the investments in common shares in private companies.
Disclosure of detailed information about fair value of long-term debt [Table Text Block]
    December 31, 2019  
    Fair
value		     Carrying amount  
    $     $  
             
Long-term debt - Level 1   303,240     280,807  
Long-term debt - Level 2   68,585     68,235  
Balance - December 31   371,825     349,042