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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventories [abstract] |
Schedule of Inventories |
|  | December 31, |  | December 31,
|  | 2018 |  | 2017
Concentrate stockpiles |  | $ | 1,671 |  | $ | 2,594
Ore stockpiles |  |  | 3,166 |  |  | 4,144
Materials and supplies |  |  | 9,549 |  |  | 11,015
Inventories |  | $ | 14,386 |  | $ | 17,753

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