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Investments in associates and joint venture - Statements of profit or loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments in associates and joint ventures |  |  |
Sales of goods | $ 676,542 | $ 867,888 | $ 1,150,715
Sales of goods | 637,619 | 821,930 | 1,106,329
Other comprehensive profit (loss): | (163,074) | (30,696) | 10,947
Net loss from continued operations | (150,339) | (28,459) | (11,654)
Share in results | (9,517) | 47,710 | (1,144)
Minera Yanacocha S.R.L. [Member] |  |  |
Investments in associates and joint ventures |  |  |
Sales of goods | 620,162 | 739,302 | 680,618
Sales of goods | 592,394 | 734,526 | 658,653
Other comprehensive profit (loss): | 123 | 1,246 | (91)
Net loss from continued operations | (165,449) | (95,257) | (81,517)
Share in results | (72,219) | (41,580) | (35,582)
Sociedad Minera Cerro Verde Saa [Member] |  |  |
Investments in associates and joint ventures |  |  |
Net loss from continued operations | $ 274,544 | $ 390,377 | $ 119,710

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