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INVENTORIES (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Inventories    
Material on leach pads $ 10,588 $ 9,188
In-process inventory 4,669 5,486
Stockpiles 634 1,168
Precious metals 8,520 12,902
Materials and supplies 3,395 3,207
Current Inventories 27,806 31,951
Other assets    
Inventories    
Non-current portion of ore on leach pads $ 5,800 $ 10,400