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Subsidiaries with material non-controlling interest (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | $ 1,274,378 | $ 1,068,791 | $ 929,522
Cost of sales | (980,254) | (824,973) | (922,572)
Administrative expenses | (83,597) | (81,692) | (84,372)
Sales expenses | (24,088) | (21,733) | (19,365)
Exploration in non-operating areas | (18,262) | (26,589) | (30,610)
Other operating expense, net | (13,589) | 18,957 | (5,340)
Provision for contingencies | (13,879) | (565) | (395)
Impairment loss of long-lived assets | (21,620) | 0 | (3,803)
Finance income | 5,517 | 6,830 | 11,026
Finance costs | (34,623) | (31,580) | (27,572)
Net gain (loss) for exchange difference | 2,928 | 2,638 | (13,693)
Profit (loss) before income tax | 92,545 | (255,237) | (340,549)
Income tax | 18,012 | 53,504 | 14,763
Net profit (loss) | 64,435 | (327,814) | (375,545)
Attributable to non-controlling interests | 3,612 | (4,322) | (58,335)
Dividends paid to non-controlling interests | (6,036) | (7,400) | (10,488)
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 322,653 | 230,611 | 171,294
Cost of sales | (254,390) | (234,594) | (204,556)
Administrative expenses | (13,061) | (11,802) | (19,168)
Sales expenses | (10,914) | (10,650) | (9,056)
Exploration in non-operating areas | (1,975) | (1,939) | (2,366)
Other operating expense, net | (2,923) | 309 | (2,657)
Provision for contingencies | 0 |  |
Impairment loss of long-lived assets | (13,573) |  | 0
Finance income | 179 | 256 | 154
Finance costs | (12,017) | (12,554) | (10,096)
Net gain (loss) for exchange difference | 310 | (270) | (3,847)
Profit (loss) before income tax | 14,289 | (40,633) | (80,298)
Income tax | (3,903) | 7,851 | 4,109
Net profit (loss) | 10,386 | (32,782) | (76,189)
Attributable to non-controlling interests | 4,246 | (13,426) | (34,991)
Dividends paid to non-controlling interests | 0 | 0 | 0
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 20,739 | 24,339 | 32,414
Cost of sales | 0 | (16) | (54)
Administrative expenses | (90) | (112) | (106)
Sales expenses | 0 | 0 | 0
Exploration in non-operating areas | 0 | 0 | 0
Other operating expense, net | (1) | 11 | 0
Provision for contingencies | 0 |  |
Impairment loss of long-lived assets | 0 |  | 0
Finance income | 7 | 0 | 0
Finance costs | (2) | (2) | (4)
Net gain (loss) for exchange difference | (41) | (93) | 45
Profit (loss) before income tax | 20,612 | 24,127 | 32,295
Income tax | (6,044) | (6,761) | (9,186)
Net profit (loss) | 14,568 | 17,366 | 23,109
Attributable to non-controlling interests | 5,827 | 6,950 | 9,244
Dividends paid to non-controlling interests | 6,036 | 7,400 | 10,488
Minera La Zanja S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 165,319 | 178,922 | 161,007
Cost of sales | (153,230) | (150,039) | (213,372)
Administrative expenses | (2,814) | (1,980) | (2,251)
Sales expenses | (881) | (938) | (1,207)
Exploration in non-operating areas | (2,871) | (4,619) | (8,954)
Other operating expense, net | (969) | 4,237 | (687)
Provision for contingencies | (1,370) |  |
Impairment loss of long-lived assets | (21,620) |  | (3,803)
Finance income | 670 | 87 | 16
Finance costs | (1,918) | (2,614) | (3,684)
Net gain (loss) for exchange difference | 48 | 65 | (1,973)
Profit (loss) before income tax | (19,636) | 23,121 | (74,908)
Income tax | 6,841 | (18,256) | 5,702
Net profit (loss) | (12,795) | 4,865 | (69,206)
Attributable to non-controlling interests | (6,006) | 2,342 | (32,486)
Dividends paid to non-controlling interests | 0 | 0 | 0
Apu Coropuna S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 0 | 0 |
Cost of sales | 0 | 0 |
Administrative expenses | (92) | (4) |
Sales expenses | 0 | 0 |
Exploration in non-operating areas | (680) | (524) |
Other operating expense, net | (744) | 0 |
Provision for contingencies | 1 |  |
Impairment loss of long-lived assets | 0 |  |
Finance income | 0 | 0 |
Finance costs | (1) | 0 |
Net gain (loss) for exchange difference | 1 | 5 |
Profit (loss) before income tax | (1,515) | (523) |
Income tax | 0 | 0 |
Net profit (loss) | (1,515) | (523) |
Attributable to non-controlling interests | (454) | (157) |
Dividends paid to non-controlling interests | 0 | 0 |
Other minor subsidiaries [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 0 | 0 |
Cost of sales | 0 | 0 |
Administrative expenses | (24) | 0 |
Sales expenses | 0 | 0 |
Exploration in non-operating areas | 0 | 0 |
Other operating expense, net | 0 | (410) |
Provision for contingencies | 0 |  |
Impairment loss of long-lived assets | 0 |  |
Finance income | 0 | 0 |
Finance costs | 0 | 0 |
Net gain (loss) for exchange difference | 410 | 0 |
Profit (loss) before income tax | 386 | (410) |
Income tax | 0 | 0 |
Net profit (loss) | 386 | (410) |
Attributable to non-controlling interests | (1) | (31) |
Dividends paid to non-controlling interests | 0 | 0 |
Subsidiaries with material non-controlling interests [member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Revenues | 508,711 | 433,872 | 364,715
Cost of sales | (407,620) | (384,649) | (417,982)
Administrative expenses | (16,081) | (13,898) | (21,525)
Sales expenses | (11,795) | (11,588) | (10,263)
Exploration in non-operating areas | (5,526) | (7,082) | (11,320)
Other operating expense, net | (4,637) | 4,147 | (3,344)
Provision for contingencies | (1,369) |  |
Impairment loss of long-lived assets | (35,193) |  | (3,803)
Finance income | 856 | 343 | 170
Finance costs | (13,938) | (15,170) | (13,784)
Net gain (loss) for exchange difference | 728 | (293) | (5,775)
Profit (loss) before income tax | 14,136 | 5,682 | (122,911)
Income tax | (3,106) | (17,166) | 625
Net profit (loss) | 11,030 | (11,484) | (122,286)
Attributable to non-controlling interests | 3,612 | (4,322) | (58,335)
Dividends paid to non-controlling interests | $ 6,036 | $ 7,400 | $ 10,488

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