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Sales - geographic region (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Sales of goods [Line Items]      
Less: Royalty contributions (see Note 2(k)) $ (12,974) $ (11,749) $ (12,832)
Revenue from sale of goods 863,470 637,619 821,930
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of goods before deducting royalty expense 4,199,448 2,538,593 2,896,894
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 3,223,191 2,096,084 2,374,350
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 429,330 120,865 265,599
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 232,502 106,489 168,077
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 314,425 207,954 77,716
Sociedad Minera Cerro Verde S.A.A. [Member] | Central America      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of goods before deducting royalty expense $ 0 $ 7,201 $ 11,152