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Subsidiaries with material non-controlling interest (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 221,237 | $ 215,590 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 1,791 | 3,612 | $ (4,322)
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 176,978 | 165,032 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 2,880 | 4,246 | (13,426)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 1,800 | 1,693 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 5,667 | 5,827 | 6,950
Minera La Zanja S.R.L. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 42,296 | 48,642 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (6,346) | (6,006) | 2,342
Apu Coropuna S.R.L. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 163 | 223 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (410) | (454) | (157)
Other minor subsidiaries [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 0 | 0 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 0 | (1) | (31)
Country of domicile [member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 221,237 | $ 215,590 | $ 226,122
Country of domicile [member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Equity interest held by non-controlling interests: |  |  |
Proportion of ownership interests held by non-controlling interests | 38.57% | 38.57% | 38.67%
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 176,978 | $ 165,032 | $ 167,986
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ 2,880 | $ 4,246 | $ (13,426)
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% | 40.00% | 40.00%
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 1,800 | $ 1,693 | $ 1,906
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ 5,667 | $ 5,827 | $ 6,950
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% | 46.94% | 46.94%
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 42,295 | $ 48,642 | $ 55,613
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ (6,346) | $ (6,006) | $ 2,342
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% | 30.00% | 30.00%
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 164 | $ 223 | $ 678
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (410) | (454) | (157)
Country of domicile [member] | Other minor subsidiaries [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 0 | 0 | (61)
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ 0 | $ (1) | $ (31)

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