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Tax situation (Details 2) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets, net |  |
Deferred tax assets | $ 43,129 | $ 25,881
Minera Yanacocha SRL and subsidiary [Member] |  |
Deferred income tax assets, net |  |
Deferred tax assets | 947,802 | 896,842
Allowance of deferred income tax asset | (947,802) | (896,842)
Net deferred income tax asset | 0 | 0
Minera Yanacocha SRL and subsidiary [Member] | Property, plant and mine development [Member] |  |
Deferred income tax assets, net |  |
Deferred tax assets | 571,210 | 608,783
Minera Yanacocha SRL and subsidiary [Member] | Reclamation [Member] |  |
Deferred income tax assets, net |  |
Deferred tax assets | 233,843 | 160,261
Minera Yanacocha SRL and subsidiary [Member] | Accounts payable and accrued expenses [Member] |  |
Deferred income tax assets, net |  |
Deferred tax assets | 78,241 | 64,703
Minera Yanacocha SRL and subsidiary [Member] | Inventory [Member] |  |
Deferred income tax assets, net |  |
Deferred tax assets | 61,435 | 60,018
Minera Yanacocha SRL and subsidiary [Member] | Other [Member] |  |
Deferred income tax assets, net |  |
Deferred tax assets | $ 3,073 | $ 3,077

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