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Commitments and contingencies - Yanacocha - Tax Dispute related to the amortization of the contractual rights (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 18, 2019 Vote | Dec. 31, 2003 | Dec. 31, 2002 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($)
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |
Withholding tax rate |  | 12.00% | 30.00% |  |  |  |
Withholding tax, Old Tax Rate |  |  |  | 12.00% |  |  |
Contingent liability |  |  |  |  |  | S/ 43,462,000 | $ 11,993,000
Minera Yanacocha S.R.L |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |
Withholding tax rate |  | 12.00% |  |  |  |  |
Withholding tax, New Tax Rate |  |  |  | 30.00% |  |  |
Payment to acquire contractual positions in mining concession agreements |  |  |  | $ 29,000,000 |  |  |
Number of votes cast against | Vote | 3 |  |  |  |  |  |
Number of votes in favorable | Vote | 2 |  |  |  |  |  |
Minimum number of votes required for winning the case | Vote | 4 |  |  |  |  |  |
Contingent liability |  |  |  |  | $ 8,000,000 |  |
Interest payable |  |  |  |  | 16,800,000 |  |
Penalty payable |  |  |  |  | 4,000,000 |  |
Potential liability in the form of fines and interest |  |  |  |  | 61,000,000 |  |
Amount related to workers participation |  |  |  | $ 2,100,000 |  |  |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |
Payment to acquire contractual positions in mining concession agreements |  |  |  |  | $ 29,000,000 |  |

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