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Subsidiaries with material non-controlling interest - 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
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Sales of goods | $ 676,542 | $ 867,888 | $ 1,150,715
Net profit (loss) | (150,339) | (28,459) | (11,654)
Attributable to non-controlling interests | (14,621) | (16,251) | 1,791
Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Sales of goods | 255,275 | 299,252 | 332,298
Net profit (loss) | (31,541) | (32,855) | 6,305
Attributable to non-controlling interests | (12,895) | (13,432) | 2,880
Minera La Zanja S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Sales of goods | 33,033 | 43,520 | 96,611
Net profit (loss) | (14,712) | (19,364) | (13,519)
Attributable to non-controlling interests | (6,905) | (9,090) | (6,346)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Sales of goods | 18,638 | 22,297 | 20,385
Net profit (loss) | 13,004 | 15,715 | 14,168
Attributable to non-controlling interests | 5,201 | 6,286 | 5,667
Apu Coropuna S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Sales of goods | 0 | 0 | 0
Net profit (loss) | (44) | (48) | (1,369)
Attributable to non-controlling interests | (22) | (14) | (410)
Other minor subsidiaries [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Sales of goods | 0 | 0 | 0
Net profit (loss) | 0 | (17) | 0
Attributable to non-controlling interests | $ 0 | $ (1) | $ 0

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