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Operating expenses, net (Details) - Minera Yanacocha SRL and subsidiary [member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating expenses, net | $ 63,514 | $ 71,496 | $ 82,846
Exploration and advanced projects [member] |  |  |
Operating expenses, net | 51,694 | 49,580 | 64,230
Severance program [member] |  |  |
Operating expenses, net | 9,419 | 9,659 | 14,904
Write-off of fixed assets [member] |  |  |
Operating expenses, net | 1,368 | 14,036 | 2,411
Cost of fixed assets sold [member] |  |  |
Operating expenses, net | 1,632 | 160 | 1,624
Income from fixed asset sales [member] |  |  |
Operating expenses, net | (2,235) | (471) | (1,116)
Others, net [member] |  |  |
Operating expenses, net | $ 1,636 | $ (1,468) | $ 793

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- Definition The amount of operating income (expense). + References No definition available. + Details
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