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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRS 16 on Impact on consolidated statement of profit or loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating costs |  |  |
Cost of sales of goods, excluding depreciation and amortization | $ 393,888 | $ 512,874 | $ 613,381
Depreciation and amortization | (189,620) | (226,335) | (238,879)
Operating profit |  |  |
Administrative expenses. | 67,185 | 76,297 | 77,099
Operating expenses, net. | (2,690) | 14,715 | 1,308
Operating profit (loss) | (81,274) | (58,013) | 58,298
Other income (expense), net |  |  |
Finance costs | 37,822 | 42,173 | 38,422
Profit (loss) before income tax | (130,318) | (43,535) | 27,033
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Operating costs |  |  |
Cost of sales of goods, excluding depreciation and amortization | 666,456 | 692,721 | 619,424
Operating profit |  |  |
Administrative expenses. | 1,227 | 1,744 | 2,783
Operating expenses, net. | 34,322 | 35,987 | 76,155
Operating profit (loss) | (85,012) | 5,968 | (22,588)
Other income (expense), net |  |  |
Finance costs | 36,699 | 57,629 | 39,024
Profit (loss) before income tax | $ (112,431) | $ (30,329) | $ (52,220)

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