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Tax situation - Income tax expense (benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income tax      
Deferred $ (44,046) $ 15,506 $ (37,501)
Supplementary retirement fund      
Income tax expense reported in the statements of comprehensive income (23,671) 25,430 (25,590)
Sociedad Minera Cerro Verde S.A.A. [Member]      
Income tax      
Current 550,731 175,870 107,666
Deferred 30,864 25,962 139,934
income tax expense (benefit) 581,595 201,832 247,600
Mining taxes      
Current mining royalty and special mining tax 144,895 32,203 47,032
Supplementary retirement fund      
Current 8,828 2,568 1,835
Deferred 385 323 1,607
Total Supplementary retirement fund 9,213 2,891 3,442
Income tax expense reported in the statements of comprehensive income $ 735,703 $ 236,926 $ 298,074