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Tax situation (Details 6) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax |  |  |
Current | $ 16,928 | $ 23,837 | $ 39,444
Deferred | 9,998 | (5,825) | 14,060
Supplementary retirement fund |  |  |
Income tax expense reported in the statements of comprehensive income | (26,926) | (18,012) | (53,504)
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Income tax |  |  |
Current | (325,170) | 430,974 | 141,153
Deferred | 0 | (167,541) | 81,441
Current and deferred tax relating to items credited (charged) directly to equity | 256,569 | 263,433 | 222,594
Mining taxes |  |  |
Current Mining Royalty and Special Mining Tax | 65,055 | 213,280 | 37,763
Supplementary retirement fund |  |  |
Current | 1,499 | 10,897 | 2,205
Deferred | 760 | (1,567) | 520
Total Supplementary retirement fund | 3,546 | 9,330 | 2,725
Income tax expense reported in the statements of comprehensive income | $ 325,170 | $ (486,043) | $ (263,082)

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