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Commitments and contingencies - Associates - Cerro Verde (Details) - Sociedad Minera Cerro Verde S.A.A. $ in Millions, S/ in Billions |  | 12 Months Ended
--- | --- | ---
Jun. 23, 2004 | Dec. 31, 2014 PEN (S/) | Dec. 31, 2014 USD ($)
SUNAT. | December 2006 to December 2013 |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Payment of Litigation Settlement Amount |  | S/ 2.9 | $ 791.9
Minimum |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Royalty rate on net sales | 1.00% |  |
Maximum |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Royalty rate on net sales | 3.00% |  |
New guarantee contract |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Royalty rate on net sales | 1.00% |  |
New guarantee contract | Minimum |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Royalty rate on net sales | 1.00% |  |
New guarantee contract | Maximum |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Royalty rate on net sales | 12.00% |  |

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