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Subsidiaries with material non-controlling interest (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | $ 1,167,381 | $ 1,274,378 | $ 1,068,791
Net profit (loss) | (11,654) | 64,435 | (327,814)
Attributable to non-controlling interests | 1,791 | 3,612 | (4,322)
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 332,298 | 322,653 | 230,611
Net profit (loss) | 6,305 | 10,386 | (32,782)
Attributable to non-controlling interests | 2,880 | 4,246 | (13,426)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 20,385 | 20,739 | 24,339
Net profit (loss) | 14,168 | 14,568 | 17,366
Attributable to non-controlling interests | 5,667 | 5,827 | 6,950
Minera La Zanja S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 96,611 | 165,319 | 178,922
Net profit (loss) | (13,519) | (12,795) | 4,865
Attributable to non-controlling interests | (6,346) | (6,006) | 2,342
Apu Coropuna S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 0 | 0 | 0
Net profit (loss) | (1,369) | (1,515) | (523)
Attributable to non-controlling interests | (410) | (454) | (157)
Other minor subsidiaries [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 0 | 0 | 0
Net profit (loss) | 0 | 386 | (410)
Attributable to non-controlling interests | $ 0 | $ (1) | $ (31)

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