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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating expenses, net | $ 76,155 | $ 63,514 | $ 71,496
Exploration and advanced projects [member] |  |  |
Operating expenses, net | 62,643 | 51,694 | 49,580
Severance program [member] |  |  |
Operating expenses, net | 8,678 | 9,419 | 9,659
Write-off of fixed assets [member] |  |  |
Operating expenses, net | 0 | 1,368 | 14,036
Cost of fixed assets sold [member] |  |  |
Operating expenses, net | 5,445 | 1,632 | 160
Income from fixed asset sales [member] |  |  |
Operating expenses, net | (4,821) | (2,235) | (471)
Others, net [member] |  |  |
Operating expenses, net | 256 | 1,636 | (1,468)
Tax fine [Member] |  |  |
Operating expenses, net | $ 3,954 | $ 0 | $ 0

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