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DECOMMISSIONING AND RESTORATION LIABILITY (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
 
 
December 31,

2018
 
 
December 31,

2017
 
Expected undiscounted cash flows
 
$
56,122
 
 
$
30,045
 
Discount rate
 
 
2.18
%
 
 
2.26
%
Inflation rate
 
 
1.95
%
 
 
1.99
%
Periods
 
 
2029
 
 
 
2028
 
 
The Kennady North Project mine decommissioning and restoration liability was calculated using the following assumptions as at December 31, 2018:
 
 
 
December 31,

2018
 
Expected undiscounted cash flows
 
$
175
 
Discount rate
 
 
1.86
%
Inflation rate
 
 
1.95
%
Periods
 
 
2021
 
Disclosure of detailed information about decommissioning and restoration liability activity [Text Block]
The continuity of the decommissioning and restoration liability at December 31, 2018 and 2017 is as follows:
 
 
 
GK Mine
 
 
KNP
 
 
Total
 
Balance, at January 1, 2017
 
$
24,266
 
 
$
-
 
 
$
24,266
 
Change in estimate of discounted cash flows
 
 
4,372
 
 
 
-
 
 
 
4,372
 
Accretion recorded during the year
 
 
562
 
 
 
-
 
 
 
562
 
Balance, at December 31, 2017
 
$
29,200
 
 
$
-
 
 
$
29,200
 
Addition of balance at the time of KDI acquisition (Note 6)
 
 
-
 
 
 
173
 
 
 
173
 
Change in estimate of discounted cash flows
 
 
24,900
 
 
 
(8
)
 
 
24,892
 
Accretion recorded during the year
 
 
656
 
 
 
1
 
 
 
657
 
Balance, at December 31, 2018
 
$
54,756
 
 
$
166
 
 
$
54,922