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DECOMMISSIONING AND RESTORATION LIABILITY (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Decommissioning And Restoration Liability [Abstract]  
Disclosure of detailed information about decommissioning and restoration liability assumptions [Text Block]
The GK mine decommissioning and restoration liability was calculated using the following assumptions as at December 31, 2017 and 2016:
 
 
 
December 31,
 
December 31,
 
 
 
2017
 
2016
 
Expected undiscounted cash flows
 
$
30,045
 
$
24,937
 
Discount rate
 
 
2.26
%
 
2.31
%
Inflation rate
 
 
1.99
%
 
2.08
%
Periods
 
 
2028
 
 
2028
 
Disclosure of detailed information about decommissioning and restoration liability activity [Text Block]
The continuity of the decommissioning and restoration liability at December 31, 2017 and 2016 is as follows:
 
 
 
December 31,
 
December 31,
 
 
 
2017
 
2016
 
Balance, beginning of year
 
$
24,266
 
$
23,045
 
Change in estimate of discounted cash flows
 
 
4,372
 
 
726
 
Accretion recorded during the year
 
 
562
 
 
495
 
Balance, end of the year
 
$
29,200
 
$
24,266