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Net sales - Sales of goods (Details) S/ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 PEN (S/) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 PEN (S/) | Dec. 31, 2018 USD ($)
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper |  | $ 181,311 |  | $ 238,304 |  | $ 274,761
Less: Royalty contributions (see Note 2(k)) |  | (11,749) |  | (12,832) |  | (21,388)
Revenue from sale of goods |  | 637,619 |  | 821,930 |  | 1,106,329
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper |  | 2,538,593 |  | 2,896,894 |  | 3,061,930
Less: Royalty contributions (see Note 2(k)) |  | (2,000) |  | (2,923) |  | (2,743)
Revenue from sale of goods |  | 2,538,593 |  | 2,896,894 |  | 3,061,930
Sociedad Minera Cerro Verde S.A.A. [Member] | Copper concentrate [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | S/ 743,274 | 2,088,167 | S/ 912,974 | 2,294,249 | S/ 962,113 | 2,458,088
Sociedad Minera Cerro Verde S.A.A. [Member] | Copper cathode [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | S/ 83,870 | 241,808 | S/ 88,875 | 244,277 | S/ 86,346 | 251,908
Sociedad Minera Cerro Verde S.A.A. [Member] | Other primarily silver and molybdenum concentrate [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper |  | $ 208,618 |  | $ 358,368 |  | $ 351,934

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