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INVENTORIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Inventories |  |
Material on leach pads | $ 12,970 | $ 10,370
In-process inventory | 6,128 | 3,446
Stockpiles | 1,401 | 1,272
Precious metals | 6,432 | 3,421
Materials and supplies | 3,751 | 3,530
Current Inventories | 30,682 | 22,039
Other assets |  |
Inventories |  |
Non-current portion of ore on leach pads | $ 3,400 | $ 4,600

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