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Subsidiaries with material non-controlling interest (Details) - USD ($) $ in Thousands | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | $ 172,397 | $ 196,678 | $ 221,237 | $ 172,397
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (14,621) | (16,251) | 1,791 |
Sociedad Minera El Brocal S.A.A |  |  |  |
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 144,501 | 161,917 |  | 144,501
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (12,895) | (13,432) | 2,880 |
Minera La Zanja S.R.L. [Member] |  |  |  |
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 26,121 | 33,026 |  | 26,121
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (6,905) | (9,090) | (6,346) |
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |  |
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 1,648 | 1,587 |  | 1,648
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | 5,201 | 6,286 | 5,667 |
Apu Coropuna S.R.L. [Member] |  |  |  |
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 127 | 148 |  | $ 127
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (22) | (14) | (410) |
Other minor subsidiaries [Member] |  |  |  |
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | 0 | (1) | 0 |
Country of domicile [member] | Sociedad Minera El Brocal S.A.A |  |  |  |
Equity interest held by non-controlling interests: |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  | 38.57%
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 144,501 | 161,917 | 176,978 | $ 144,501
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (12,895) | (13,432) | 2,880 |
Country of domicile [member] | Minera La Zanja S.R.L. [Member] |  |  |  |
Equity interest held by non-controlling interests: |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  | 46.94%
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 26,121 | 33,026 | 42,295 | $ 26,121
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (6,905) | (9,090) | (6,346) |
Country of domicile [member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |  |
Equity interest held by non-controlling interests: |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  | 40.00%
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 1,648 | 1,587 | 1,800 | $ 1,648
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | 5,201 | 6,286 | 5,667 |
Country of domicile [member] | Apu Coropuna S.R.L. [Member] |  |  |  |
Equity interest held by non-controlling interests: |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  | 30.00%
Accumulated balances of material non-controlling interest: |  |  |  |
Non-controlling interests | 127 | 148 | 164 | $ 127
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | (22) | (14) | (410) |
Country of domicile [member] | Other minor subsidiaries [Member] |  |  |  |
Profit (loss) allocated to material non-controlling interest: |  |  |  |
Profit (loss), attributable to non-controlling interests | $ 0 | $ (1) | $ 0 |

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