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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
INVENTORIES    
Ore in stockpiles and on leach pads $ 108,161 $ 90,536
Concentrates and dore bars 123,047 108,193
Supplies 269,768 244,985
Total current inventories 500,976 443,714
Non-current ore in stockpiles and on leach pads 69,587 62,780
Total inventories 570,563 506,494
Inventory write-down $ 2,500 $ 6,600