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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

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