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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

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