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Production costs
 12 Months Ended
Dec. 31, 2018
Expenses by nature [abstract]  
Production costs
29. Production costs
 
2018

 
2017

 
 
 
 
Labour
$
74,023

 
$
52,670

Fuel
14,910

 
23,241

Reagents
40,587

 
40,839

Electricity
14,288

 
12,132

Mining contractors
17,107

 
12,575

Operating and maintenance supplies and services
31,772

 
56,342

Site general and administrative costs
33,667

 
23,621

Inventory change
33,459

 
(36,501
)
Royalties, production taxes and selling expenses
8,167

 
7,821

 
$
267,980

 
$
192,740