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Tax situation - Income tax expense (benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax      
Deferred $ 15,506 $ (37,501) $ 9,997
Supplementary retirement fund      
Income tax expense reported in the statements of comprehensive income 25,430 (25,590) 26,879
Sociedad Minera Cerro Verde S.A.A. [Member]      
Income tax      
Current 175,870 107,666 254,767
Deferred 25,962 139,934 61,483
income tax expense (benefit) 201,832 247,600 316,250
Mining taxes      
Current mining royalty and special mining tax 32,203 47,032 6,661
Supplementary retirement fund      
Current 2,568 1,835 1,499
Deferred 323 1,607 760
Total Supplementary retirement fund 2,891 3,442 2,259
Income tax expense reported in the statements of comprehensive income $ 236,926 $ 298,074 $ 325,170