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Mine restoration provisions (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Provisions [Abstract]  
Disclosure of other provisions
The following table shows the movement in the provision for mine restoration provisions:
 
 
2018

 
2017

 
 
$

 
$

 
 
 
 
 
Balance, beginning of year
 
98,446

 
81,162

Reclamation spending
 
(1,040
)
 
(320
)
Accretion expense
 
2,641

 
1,855

Change in obligation
 
17,174

 
15,749

Balance, end of year
 
117,221

 
98,446

Less: current portion
 
(3,170
)
 
(1,819
)
 
 
114,051

 
96,627