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Net sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Net Sales [Line Items]      
Revenue from sale of goods $ 1,223,942 $ 1,015,670 $ 846,269
Revenue from rendering of services 29,697 28,782 50,839
Revenue arising from rendering of services, sale of goods 1,253,639 1,044,452 897,108
Gold 511,434 440,603 419,541
Silver 409,775 385,989 313,418
Copper 268,527 224,649 131,356
Zinc 188,023 142,425 102,110
Lead 94,955 58,690 55,445
Manganese sulfate 6,317 5,982 3,649
Revenue from sale of goods before commercial deductions 1,479,097 1,258,338 1,025,519
Commercial deductions (253,939) (244,414) (196,145)
Adjustments to prior period liquidations 919 4,611 7,467
Embedded derivatives from sale of concentrate 8,786 880 (388)
Hedge operations (10,921) (3,745) 9,816
Indium 66 0 0
America [Member]      
Disclosure Of Net Sales [Line Items]      
Revenue from sale of goods 464,000 410,154 419,359
Revenue from rendering of services 14,794 0 0
Peru [Member]      
Disclosure Of Net Sales [Line Items]      
Revenue from sale of goods 591,185 401,372 345,146
Revenue from rendering of services 14,903 28,782 50,839
Europe [Member]      
Disclosure Of Net Sales [Line Items]      
Revenue from sale of goods 91,414 109,788 60,549
Asia [Member]      
Disclosure Of Net Sales [Line Items]      
Revenue from sale of goods $ 77,343 $ 94,356 $ 21,215