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Financial - risk management objectives and policies (Details 3) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2007
--- | --- | --- | ---
Financial - risk management [Line Items] |  |  |
Total | $ 83,991 | $ 40,110 |
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Financial - risk management [Line Items] |  |  |
Accounts payable | 53,070 | 44,634 | $ 43,108
Accounts payable to related parties |  | 9,052 | 9,962
Remuneration and similar benefits payable |  | 8,516 | $ 27,419
Total | $ 80,489 | $ 62,202 |

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