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Net sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Sales of goods [Line Items]      
Revenue from sale of goods $ 637,619 $ 821,930 $ 1,106,329
Revenue from rendering of services 20,285 23,661 24,001
Gold 229,590 254,194 411,877
Silver 230,498 298,171 362,122
Copper 181,311 238,304 274,761
Zinc 120,546 149,317 164,666
Lead 48,426 89,141 85,555
Manganese sulfate 4,051 6,046 6,655
Revenue from sale of goods before commercial deductions 814,422 1,035,173 1,305,636
Commercial deductions (179,748) (220,306) (192,684)
Royalty income 18,638 22,297 20,385
Revenue from contracts with customers 673,597 860,825 1,157,338
Revenue 676,542 867,888 1,150,715
Contracts with customers for sale of goods 634,674 814,867 1,112,952
Hedge Operations (6,464) 4,322 (1,398)
Fair Value of accounts receivables. 5,154 2,347 (6,013)
Adjustments to prior period liquidations 4,255 394 788
Peru [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from rendering of services 20,173 23,501 23,712
Royalty income 18,638 22,297 20,385
Revenue from contracts with customers   22,297  
Contracts with customers for sale of goods 389,854 476,978 521,017
America      
Disclosure of Sales of goods [Line Items]      
Revenue from rendering of services 92 130 289
Contracts with customers for sale of goods 163,500 171,769 370,624
Asia [Member]      
Disclosure of Sales of goods [Line Items]      
Contracts with customers for sale of goods 39,110 105,645 120,519
Europe [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from rendering of services 20 30  
Contracts with customers for sale of goods $ 42,210 $ 60,475 $ 100,792