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Tax situation - Effective income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income Tax Explanatory        
Profit before income tax   $ 101,129 $ (58,099) $ (1,955)
Income tax rate 29.50% 32.00% 32.00% 32.00%
Expected income tax expense   $ 72,237 $ (23,716) $ 25,766
Non - deductible expenses   (3,931) (11,097) (13,091)
Tax expense (income), continuing operations   (23,671) 25,430 (25,590)
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure Of Income Tax Explanatory        
Profit before income tax   $ 1,927,177 $ 511,470 $ 688,451
Income tax rate   32.00% 32.00% 32.00%
Expected income tax expense   $ 616,697 $ 163,670 $ 220,304
Special mining tax and mining royalties   (46,366) (10,305) (15,660)
Provision (gain) for uncertainty about treatments of income taxes   (14,379) 1,313 7,060
Non - deductible expenses   14,609 16,925 24,129
Income tax true - ups   6,345 5,292 2,915
Moratorium interest   1,019 24,652 4,052
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 32% to 30.85%)   840 (2,750) (2,746)
Others   2,830 3,035 7,546
Current and deferred income tax charges to results   581,595 201,832 247,600
Mining taxes charged to results   144,895 32,203 47,032
Supplementary retirement fund charged to results   9,213 2,891 3,442
Tax expense (income), continuing operations   $ 735,703 $ 236,926 $ 298,074
Effective income tax   38.18% 46.32% 43.30%