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Accounts payable and accrued liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Trade and other payables [abstract]  
Disclosure of detailed information about trade and other payables [Table Text Block]
    December 31,     December 31,  
    2019     2018  
    $     $  
             
Payables on metals received from offtakes   -     5,190  
Trade payables   6,836     217  
Other payables   6,044     5,246  
Accrued interests on long-term debt   265     46  
Other accrued liabilities   5,627     1,033  
    18,772     11,732