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INVENTORIES (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Inventories    
Material on leach pads $ 21,122 $ 10,370
In-process inventory 3,919 3,446
Stockpiles 1,839 1,272
Precious metals 2,404 3,421
Materials and supplies 3,703 3,530
Current Inventories 32,987 22,039
Other assets    
Inventories    
Non-current portion of ore on leach pads $ 1,800 $ 4,600