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Commitments and contingencies - Subsidiaries - Sociedad Minera El Brocal S.A.A (Details) |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Nov. 28, 2022 USD ($) | Nov. 28, 2022 PEN (S/) | Aug. 31, 2022 USD ($) item | Aug. 31, 2022 PEN (S/) item | May 21, 2021 USD ($) | May 21, 2021 PEN (S/) | Dec. 30, 2020 USD ($) item | Dec. 30, 2020 PEN (S/) item | Dec. 18, 2020 USD ($) | Dec. 18, 2020 PEN (S/) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 PEN (S/) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 PEN (S/) item | Dec. 31, 2022 PEN (S/) | Dec. 28, 2022 USD ($) | Dec. 28, 2022 PEN (S/) | Nov. 30, 2022 USD ($) | Nov. 30, 2022 PEN (S/) | Oct. 25, 2022 USD ($) | Oct. 25, 2022 PEN (S/) | Dec. 31, 2021 PEN (S/) | Jan. 07, 2021 USD ($) | Jan. 07, 2021 PEN (S/) | Jan. 05, 2021 USD ($) | Jan. 05, 2021 PEN (S/) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 PEN (S/) | Dec. 30, 2020 PEN (S/) | Jan. 27, 2020 USD ($) | Jan. 27, 2020 PEN (S/) | Jan. 08, 2015 USD ($) | Jan. 08, 2015 PEN (S/) | Jun. 18, 2014 USD ($) | Jun. 18, 2014 PEN (S/)
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  | $ 10,827,000 |  | $ 10,364,000 |  | S/ 41,358,000 |  |  |  |  |  |  | S/ 39,590,000 |  |  |  |  |  |  |  |  |  |  |  |  |
La Zanja [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount disbursed recorded as an account receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,353,000 | S/ 8,959,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
El Brocal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  | 2,188,000 |  | 1,062,000 |  | 8,333,000 |  |  |  |  |  |  | S/ 4,044,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount disbursed recorded as an account receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,067,000 | S/ 7,871,000 |  |  |  |  |  |  |  |  |  |  |
Rio seco |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount disbursed recorded as an account receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 609,000 | S/ 2,318,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SUNAT. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax assessment value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 394,227,000 | S/ 1,505,948,000 |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  | 2,749,000 |  |  |  | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SUNAT. | Development cost of Smelter Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of fine returned |  |  |  |  |  |  |  |  |  |  | 789,000 | S/ 3,003,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  | 1,278,000 |  |  |  | 4,868,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SUNAT. | El Brocal | Development cost of Smelter Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation of the tailings |  |  |  |  | $ 1,575,000 | S/ 6,018,000 |  |  | $ 1,575,000 | S/ 6,108,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of fine returned |  |  |  |  |  |  |  |  |  |  | 121,000 | S/ 459,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  | $ 262,000 |  |  |  | S/ 997,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development cost |  |  |  |  | $ 1,410,000 | S/ 5,384,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 2011 [Member] | SUNAT. | El Brocal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,188,000 | S/ 8,067,533
Year 2012 [Member] | SUNAT. | El Brocal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax assessment value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,108,000 | S/ 4,030,000 |  |
Year 2014 [Member] | SUNAT. | El Brocal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tailings depreciation rate questioned |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 2014 [Member] | SUNAT. | El Brocal | Development cost of Smelter Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  | $ 2,854,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | S/ 10,902,000 |  |  |  |  |  |
Development cost |  |  |  |  |  |  | $ 4,341,000 | S/ 16,582,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 2015 [Member] | SUNAT. | El Brocal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tailings depreciation rate questioned |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount disbursed recorded as an account receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 382,000 | S/ 1,456,000 |  |  |  |
Year 2015 [Member] | SUNAT. | El Brocal | Development cost of Smelter Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 893,000 | S/ 3,412,000 |  |  |  |  |  |  |
Development cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,647,000 | S/ 13,930,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ifrs Tax Year 2018 [Member] | SUNAT. | La Zanja [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation of the tailings | $ 2,036,000 | S/ 7,777,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development cost | $ 1,240,000 | S/ 4,738,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 2020 [Member] | SUNAT. | Rio seco |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 754,000 | S/ 2,882,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 2016 [Member] | SUNAT. | El Brocal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tailings depreciation rate questioned |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 2016 [Member] | SUNAT. | El Brocal | Development cost of Smelter Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development cost |  |  | $ 5,335,000 | S/ 20,380,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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