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Subsidiaries with material non-controlling interest (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 215,590 | $ 226,122 | $ 228,170
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 3,612 | (4,322) | (58,335)
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 165,032 | 167,986 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 4,246 | (13,426) | (34,991)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 1,693 | 1,906 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | 5,827 | 6,950 | 9,244
Minera La Zanja S.R.L. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 48,642 | 55,613 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (6,006) | 2,342 | $ (32,486)
Apu Coropuna S.R.L. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 223 | 678 |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (454) | (157) |
Other minor subsidiaries [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 0 | (61) |
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ (1) | $ (31) |
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 | 38.58% | 38.67% | 45.93%
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | $ 165,032 | $ 167,986 | $ 172,542
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ 4,246 | $ (13,426) | $ (34,991)
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 | $ 1,693 | $ 1,906 | $ 2,357
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ 5,827 | $ 6,950 | $ 9,244
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 | $ 48,642 | $ 55,613 | $ 53,271
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (6,006) | 2,342 | (32,486)
Country of domicile [member] | Apu Coropuna S.R.L. [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 223 | 678 | 0
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | (454) | (157) | (102)
Foreign countries [member] | Other minor subsidiaries [Member] |  |  |
Accumulated balances of material non-controlling interest: |  |  |
Non-controlling interests | 0 | (61) | 0
Profit (loss) allocated to material non-controlling interest: |  |  |
Profit (loss), attributable to non-controlling interests | $ (1) | $ (31) | $ 0

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