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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2018
Classes of current inventories [abstract] |
Schedule of Inventories |
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Concentrates |  | $ | 1,230 |  |  | $ | 1,391 |
Ore stockpiles |  |  | 1,436 |  |  |  | 2,877 |
Spare parts and supplies |  |  | 5,584 |  |  |  | 5,098 |
|  | $ | 8,250 |  |  | $ | 9,366 |

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