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Subsidiaries with material non-controlling interest (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
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