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Subsidiaries with material non-controlling interest - Statements of profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Sales of goods $ 676,542 $ 867,888 $ 1,150,715
Net profit (loss) (150,339) (28,459) (11,654)
Attributable to non-controlling interests (14,621) (16,251) 1,791
Sociedad Minera El Brocal S.A.A      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Sales of goods 255,275 299,252 332,298
Net profit (loss) (31,541) (32,855) 6,305
Attributable to non-controlling interests (12,895) (13,432) 2,880
Minera La Zanja S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Sales of goods 33,033 43,520 96,611
Net profit (loss) (14,712) (19,364) (13,519)
Attributable to non-controlling interests (6,905) (9,090) (6,346)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Sales of goods 18,638 22,297 20,385
Net profit (loss) 13,004 15,715 14,168
Attributable to non-controlling interests 5,201 6,286 5,667
Apu Coropuna S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Sales of goods 0 0 0
Net profit (loss) (44) (48) (1,369)
Attributable to non-controlling interests (22) (14) (410)
Other minor subsidiaries [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Sales of goods 0 0 0
Net profit (loss) 0 (17) 0
Attributable to non-controlling interests $ 0 $ (1) $ 0