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Investments in associates (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Investments in associates [Line Items] |  |  |
Proportion of ownership interest in associate | 45.95% | 43.65% |
Investments in associates | $ 1,536,887 | $ 1,536,607 | $ 2,043,983
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of Investments in associates [Line Items] |  |  |
Proportion of ownership interest in associate | 19.584% | 19.584% |
Investments in associates | $ 1,124,008 | $ 1,055,488 |
Compania Minera Coimolache S.A. [Member] |  |  |
Disclosure of Investments in associates [Line Items] |  |  |
Proportion of ownership interest in associate | 40.095% | 40.095% |
Investments in associates | $ 86,183 | $ 74,734 | 0
Minera Yanacocha S.R.L. [Member] |  |  |
Disclosure of Investments in associates [Line Items] |  |  |
Proportion of ownership interest in associate | 45.95% | 43.65% |
Investments in associates | $ 324,861 | $ 402,866 | $ 0
Other minor investments [Member] |  |  |
Disclosure of Investments in associates [Line Items] |  |  |
Investments in associates | $ 1,835 | $ 3,519 |

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