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Net sales (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | $ 1,122,995,000 | $ 1,223,942,000 | $ 1,015,670,000
Revenue from rendering of services | 24,001,000 | 29,697,000 | 28,782,000
Gold | 411,926,000 | 511,434,000 | 440,603,000
Silver | 369,167,000 | 409,775,000 | 385,989,000
Copper | 274,761,000 | 268,527,000 | 2,390,840,000
Zinc | 174,048,000 | 188,023,000 | 142,425,000
Lead | 89,059,000 | 94,955,000 | 58,690,000
Manganese sulfate | 6,655,000 | 6,317,000 | 5,982,000
Revenue from sale of goods before commercial deductions | 1,325,616,000 | 1,479,097,000 | 1,258,338,000
Commercial deductions | (195,865,000) | (253,939,000) | (244,414,000)
Indium | 0 | 66,000 | 0
Royalty income | 20,385,000 | 20,739,000 | 24,339,000
Revenue from contracts with customers | 1,174,137,000 | 1,275,594,000 | 1,067,045,000
America [member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | 370,624,000 | 471,863,000 | 397,795,000
Revenue from rendering of services | 289,000 | 14,794,000 | 0
Peru [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | 537,816,000 | 551,243,000 | 396,733,000
Revenue from rendering of services | 23,712,000 | 14,903,000 | 28,782,000
Royalty income | 20,385 | 20,739 | 24,339
Europe [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | 100,792,000 | 81,333,000 | 121,929,000
Asia [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | $ 120,519,000 | $ 120,719,000 | $ 97,467,000

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