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INVENTORIES (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventory, Current |
| December 31, 2019 |  | December 31, 2018
Concentrates and work-in-progress (1) | $ | 20,893 |  |  | $ | 14,746 |
Inventory of ore in stockpiles | 241 |  |  | 883 |
Raw materials and consumables | 2,823 |  |  | 2,693 |
| $ | 23,957 |  |  | $ | 18,322 |
Inventories - by duration |  |  |
Current | $ | 22,808 |  |  | $ | 16,550 |
Long term - raw materials and consumables | $ | 1,149 |  |  | $ | 1,772 |
| $ | 23,957 |  |  | $ | 18,322 |
(1) | For the year ended December 31, 2019, the Company recorded an impairment loss of $14.35 million in the statement of operations related to concentrates and work in progress inventories (December 31, 2018 - $4.58 million).

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