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Other operating expenses (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Other operational expenses [Line Items] |  |
Potential liability in the form of fines and interest | $ 14,183 |
Penalties for income tax related to disputed mining royalties |  | $ 33,800
Penalties on disputed mining royalties |  | 17,700
Profit sharing adjustments related to GEM refund |  | $ 3,600
INGEMMET |  |
Disclosure Other operational expenses [Line Items] |  |
Potential liability in the form of fines and interest | 6,800 |
SUNAT |  |
Disclosure Other operational expenses [Line Items] |  |
Potential liability in the form of fines and interest | 4,700 |
OSINERGMIN |  |
Disclosure Other operational expenses [Line Items] |  |
Potential liability in the form of fines and interest | $ 2,700 |

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