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Provisions and other liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of other provisions [abstract]  
Disclosure of other provisions [Table Text Block]
                  2019     2018  
      Restricted
share units(i)		     Deferred share units(i)     Environmental
rehabilitation(iii)		     Lease
liabilities(iii)		     Total     Restricted
share units		     Deferred share units     Total  
      $     $     $     $     $     $     $     $  
Balance - Beginning of period   32     3,462     -     -     3,494     4,343     3,325     7,668  
  Acquisition of Barkerville (Note 7)   -     -     20,549     -     20,549     -     -     -  
  Adoption of IFRS 16 (Note 4)   -     -     -     10,893     10,893     -     -     -  
  New liabilities   11     416     -     -     427     1,906     1,323     3,229  
  Accretion   -     -     89     -     89     -     -     -  
  Settlement of liabilities   (45 )   (544 )   -     (766 )   (1,355 )   (2,618 )   (499 )   (3,117 )
  RSU to be settled in equity   -     -     -     -     -     (2,426 )   -     (2,426 )
  DSU to be settled in equity   -     (3,722 )   -     -     (3,722 )   -     -     -  
  Revision of estimates   2     388     (111 )   -     279     (1,173 )   (687 )   (1,860 )
Balance - End of period   -     -     20,527     10,127     30,654     32     3,462     3,494  
Current portion   -     -     493     796     1,289     32     3,462     3,494  
Non-current portion   -     -     20,034     9,331     29,365     -     -     -  
      -     -     20,527     10,127     30,654     32     3,462     3,494  

(i) Additional information on the Deferred Share Units ("DSU") and Restricted Share Units ("RSU") are presented in Note 21.

(ii) The environmental rehabilitation provision represents the legal and contractual obligations associated with the eventual closure of the Company's mining interests, plant and equipment and exploration and evaluation assets. As at December 31, 2019, the estimated inflation-adjusted undiscounted cash flows required to settle the environmental rehabilitation amounts to $23.4 million. The weighted average actualization rate used is 4.2% and the disbursements are expected to be made between 2020 and 2024 as per the current closure plans.

(iii) The lease liabilities are described in Note 4.