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RECLAMATION PROVISION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
RECLAMATION PROVISION    
Long-term, beginning of year $ 265,308  
Current, beginning of year 9,193  
Reclassification from long-term to current, end of year (10,038) $ (9,193)
Long-term, end of year 345,268 265,308
Asset retirement obligation    
RECLAMATION PROVISION    
Long-term, beginning of year 259,706 269,068
Current, beginning of year 5,953 4,443
Current year additions and changes in estimate, net 58,891 (9,112)
Current year accretion 5,247 3,847
Liabilities settled (1,115) (1,113)
Foreign exchange revaluation 21,004 (1,474)
Reclassification from long-term to current, end of year (8,609) (5,953)
Long-term, end of year 341,077 259,706
Environmental remediation liability    
RECLAMATION PROVISION    
Long-term, beginning of year 5,602 7,231
Current, beginning of year 3,240 1,802
Current year additions and changes in estimate, net 850 243
Liabilities settled (4,559) (1,606)
Foreign exchange revaluation 487 1,172
Reclassification from long-term to current, end of year (1,429) (3,240)
Long-term, end of year $ 4,191 $ 5,602
Minimum    
RECLAMATION PROVISION    
Discount rate used in reclamation provision 1.14% 0.74%
Maximum    
RECLAMATION PROVISION    
Discount rate used in reclamation provision 2.39% 2.35%