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Net sales - geographic region (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Sales of goods [Line Items]      
Less: Royalty contributions (see Note 2(k)) $ (12,832) $ (21,388) $ (30,884)
Revenue from sale of goods 821,930 1,106,329 1,187,206
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of goods before deducting royalty expense 2,896,894 3,061,930 3,211,266
Less: Royalty contributions (see Note 2(k)) (6,828) (7,904) (8,335)
Revenue from sale of goods 2,890,066 3,054,026 3,202,931
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 2,374,350 2,404,530 2,416,826
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 265,599 295,448 287,174
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 168,077 136,400 193,174
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 77,716 209,894 314,092
Sociedad Minera Cerro Verde S.A.A. [Member] | America - other than Peru [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of goods before deducting royalty expense $ 11,152 $ 15,658 $ 0