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Net sales - geographic region (Details) - USD ($)
$ in Thousands
 12 Months Ended
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