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Production costs
 12 Months Ended
Dec. 31, 2019
Expenses by nature [abstract]  
Production costs
30. Production costs
 
2019

 
2018

 
 
 
 
Labour
$
100,908

 
$
70,336

Fuel
12,931

 
16,454

Reagents
29,871

 
49,222

Electricity
16,330

 
13,864

Mining contractors
30,162

 
14,782

Operating and maintenance supplies and services
89,828

 
62,544

Site general and administrative costs
42,919

 
33,614

Royalties, production taxes and selling expenses
11,890

 
8,629

 
$
334,839

 
$
269,445