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REHABILITATION PROVISIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of other provisions [abstract]  
Schedule of changes in the carrying amount of rehabilitation provisions
The changes in the carrying amount of the rehabilitation provisions are as follows:
 
For the Years Ended 
 December 31,
 
2017
 
2016
Beginning balance
$
77,382

 
$
79,685

Accretion of rehabilitation provisions
1,245

 
1,368

Changes in estimates
(1,923
)
 
1,856

Cost of reclamation work performed
(5,992
)
 
(5,527
)
Balance at the end of the period
$
70,712

 
$
77,382

 
 
 
 
Current portion
$
6,566

 
$
5,515

Long term portion
64,146

 
71,867

Total
$
70,712

 
$
77,382