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Subsidiaries with material non-controlling interest - Statements of profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Revenues $ 867,888 $ 1,150,715 $ 1,237,642
Net profit (loss) (28,459) (11,654) 64,435
Attributable to non-controlling interests (16,251) 1,791 3,612
Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Revenues 299,252 332,298 322,653
Net profit (loss) (32,855) 6,305 10,386
Attributable to non-controlling interests (13,432) 2,880 4,246
Minera La Zanja S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Revenues 43,520 96,611 165,319
Net profit (loss) (19,364) (13,519) (12,795)
Attributable to non-controlling interests (9,090) (6,346) (6,006)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Revenues 22,297 20,385 20,739
Net profit (loss) 15,715 14,168 14,568
Attributable to non-controlling interests 6,286 5,667 5,827
Apu Coropuna S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Revenues 0 0 0
Net profit (loss) (48) (1,369) (1,515)
Attributable to non-controlling interests (14) (410) (454)
Other minor subsidiaries [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Revenues 0 0 0
Net profit (loss) (17) 0 386
Attributable to non-controlling interests $ (1) $ 0 $ (1)