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Other assets (Tables)
 12 Months Ended
Dec. 31, 2018
Other Assets1 [Abstract]  
Schedule of Other Assets
 
 
2018

 
2017

 
 
$

 
$

 
 
 
 
 
Low-grade stockpile
 
18,237

 
11,727

Debt service reserve account (Note 10)
 
13,736

 
12,918

Loan receivable, including accrued interest
 
5,053

 
7,718

Reclamation deposits
 
2,485

 
2,353

Derivative instruments at fair value (Note 14)
 
—

 
2,768

Other
 
840

 
2,364

 
 
40,351

 
39,848