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Inventory, net (Details 3) - Minera Yanacocha SRL and subsidiary [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of inventory net [Line Items] |  |  |
Provision for impairment of materials and supplies | $ 2,896 | $ 3,104 | $ 5,060
Reversal of provision for impairment of materials and supplies | (1,092) | (3,713) | (4,011)
Opening balance | 5,272 | 5,881 | 4,832
Ending balance | $ 7,076 | $ 5,272 | $ 5,881

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