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INVENTORY (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Write-downs (reversals of write-downs) of inventories $ 0 $ (5,710)
Finished goods 23,433 19,262
Stockpiled ore 18,195 6,806
Leach pad inventory 162,335 128,783
Materials and supplies 28,785 27,730
Current inventories 232,748 182,581
Non-current materials and supplies (note 8) 2,006 3,973
Inventories 234,754 186,554
Inventory write-down $ 3,436 7,250
Puna Operations    
Disclosure of operating segments [line items]    
Write-downs (reversals of write-downs) of inventories   $ (6,342)