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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)