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Net sales - geographic region (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Sales of goods [Line Items] |  |  |
Less: Royalty contributions (see Note 2(k)) | $ (11,749) | $ (12,832) | $ (21,388)
Revenue from sale of goods | 637,619 | 821,930 | 1,106,329
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 2,538,593 | 2,896,894 | 3,061,930
Sociedad Minera Cerro Verde S.A.A. [Member] | Asia [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 2,096,084 | 2,374,350 | 2,404,530
Sociedad Minera Cerro Verde S.A.A. [Member] | North America [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 120,865 | 265,599 | 295,448
Sociedad Minera Cerro Verde S.A.A. [Member] | South America primarily Peru [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 106,489 | 168,077 | 136,400
Sociedad Minera Cerro Verde S.A.A. [Member] | Europe [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 207,954 | 77,716 | 209,894
Sociedad Minera Cerro Verde S.A.A. [Member] | America |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | $ 7,201 | $ 11,152 | $ 15,658

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