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Inventory, net (Details 1) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) lb | Dec. 31, 2016 USD ($) lb | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Disclosure of inventory net [Line Items] |  |  |  |
Mineral deposits inventory gross | $ 19,435 | $ 18,244 |  |
Impairment of mineral deposits | (1,467) | (123) | $ 20,472 | $ 7,735
Mineral deposits invenory, net | 17,968 | 18,121 |  |
Mineral deposits inventory, current | 14,730 | 5,586 |  |
Mineral deposits inventory, noncurrent | $ 3,238 | $ 12,535 |  |
Inventory units in dry metric tonne | lb | 1,329,469 | 1,184,585 |  |
Mineral in stock piles [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Mineral deposits inventory gross | $ 7,173 | $ 16,793 |  |
Inventory units in dry metric tonne | lb | 463,746 | 1,085,696 |  |
Fresh mineral in plant [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Mineral deposits inventory gross | $ 11,983 | $ 1,248 |  |
Inventory units in dry metric tonne | lb | 835,613 | 74,260 |  |
Tail Mineral [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Mineral deposits inventory gross | $ 279 | $ 203 |  |
Inventory units in dry metric tonne | lb | 30,110 | 24,629 |  |

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