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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INVENTORIES    
Material on leach pads $ 37,328 $ 14,961
In-process inventory 3,847 3,446
Stockpiles 1,384 1,272
Precious metals 1,038 3,421
Materials and supplies 4,382 3,530
Inventories 47,979 26,630
Current portion 38,376 22,039
Long-term portion 9,603 4,591
Inventory write-down $ 1,700