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DECOMMISSIONING AND RESTORATION LIABILITY
 12 Months Ended
Dec. 31, 2017
Disclosure Of Decommissioning And Restoration Liability [Abstract]  
Disclosure of contingent liabilities [text block]
9.
Decommissioning and restoration liability
 
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
 
 
The decommissioning and restoration liability has been calculated using expected cash flows that are current dollars, with inflation.
  
During the year ended December 31, 2017, the decommissioning and restoration liability was increased by $4,372 (2016 - $726) for a change in estimate, reflecting primarily an increase in estimated reclamation and restoration costs due to the construction work completed at the GK mine site, and the mining operations on the property. Estimation of the amount of the effect of the change in estimate in future periods is impracticable to determine.
 
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