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RECLAMATION PROVISION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclamation Provision      
Balance at beginning of the year $ 11,638 $ 6,963  
Changes in estimates (437) 3,900  
Unwinding of discount 378 248  
Effect of movements in exchange rates (780) 527  
Balance at end of the year 10,799 11,638  
Less: current portion (296)
Non-current portion $ 10,503 $ 11,638