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Subsidiaries with material non-controlling interest - Statements of financial position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | $ 589,152 | $ 648,619 |  |
Non-current assets | 3,390,465 | 3,458,655 |  |
Current liabilities | (360,436) | (565,357) |  |
Non-current liabilities | (819,324) | (573,717) |  |
Total shareholders' equity, net | 2,799,857 | 2,968,200 | $ 3,029,565 | $ 3,063,627
Shareholders of the parent | 2,627,460 | 2,771,522 |  |
Non-controlling interests | 172,397 | 196,678 | $ 221,237 |
Sociedad Minera El Brocal S.A.A |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 166,396 | 149,945 |  |
Non-current assets | 553,754 | 576,028 |  |
Current liabilities | (170,896) | (118,965) |  |
Non-current liabilities | (195,809) | (210,904) |  |
Total shareholders' equity, net | 353,445 | 396,104 |  |
Shareholders of the parent | 208,944 | 234,187 |  |
Non-controlling interests | 144,501 | 161,917 |  |
Minera La Zanja S.R.L. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 104,076 | 112,420 |  |
Non-current assets | 30,486 | 26,038 |  |
Current liabilities | (22,329) | (20,170) |  |
Non-current liabilities | (56,587) | (47,930) |  |
Total shareholders' equity, net | 55,646 | 70,358 |  |
Shareholders of the parent | 29,525 | 37,332 |  |
Non-controlling interests | 26,121 | 33,026 |  |
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 6,814 | 6,252 |  |
Non-current assets | 0 | 0 |  |
Current liabilities | (2,694) | (2,286) |  |
Non-current liabilities | 0 | 0 |  |
Total shareholders' equity, net | 4,120 | 3,966 |  |
Shareholders of the parent | 2,472 | 2,379 |  |
Non-controlling interests | 1,648 | 1,587 |  |
Apu Coropuna S.R.L. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 2,064 | 2,141 |  |
Non-current assets | 169 | 185 |  |
Current liabilities | (1,071) | (1,094) |  |
Non-current liabilities | (740) | (740) |  |
Total shareholders' equity, net | 422 | 492 |  |
Shareholders of the parent | 295 | 344 |  |
Non-controlling interests | $ 127 | $ 148 |  |

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