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Commitments and contingencies - Outstanding signed commitments (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | $ 639,027 | $ 583,317 | $ 539,251
Scotiabank [member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | 259,027 | 253,317 | 235,000
BBVA Continental [member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount |  |  | 190,000
Banco de Credito del Peru [member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount |  |  | $ 114,251
Pacfico Zurich [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | 200,000 | 200,000 |
La Positiva [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | 70,000 | 70,000 |
Rimac (Travelers) [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | 60,000 | $ 60,000 |
Santander [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | 25,000 |  |
MUFG Bank [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee outstanding, amount | $ 25,000 |  |

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