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Inventory and Ore on Leach Pads - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Inventory [Line Items] |  |  |  |
Inventory Write-down | $ 13,966 | $ 30,787 | $ 41,285 | $ 30,787
Silvertip [Member] |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory Write-down |  |  | $ 41,300 |

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