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Tax situation - Effective income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Income Tax Explanatory        
Profit before income tax   $ (130,318) $ (43,535) $ 27,033
Income tax rate 29.50% 32.00% 32.00% 32.00%
Expected income tax expense   $ (23,716) $ 25,766 $ (22,462)
Non - deductible expenses   (11,789) (6,877) (1,095)
Tax expense (income), continuing operations   25,430 (25,590) 26,879
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure Of Income Tax Explanatory        
Profit before income tax   $ 511,470 $ 688,451 $ 444,880
Income tax rate   32.00% 32.00% 32.00%
Expected income tax expense   $ 163,670 $ 220,304 $ 142,362
Moratorium interest   24,652 4,052 1,367
Non - deductible expenses   16,925 24,129 23,985
Royalty case   0 0 143,728
IFRIC 23 adoption   0 20,767  
Special mining tax and mining royalties   (10,305) (15,660) (25,165)
Special mining burden (GEM)   0 0 (22,334)
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%)   (2,750) (2,746) (1,958)
Income tax true - ups   7,293 (10,255) (10,312)
Others   4,348 7,620 4,896
Current and deferred income tax charges to results   203,833 248,211 256,569
Mining taxes charged to results   31,535 48,036 65,055
Supplementary retirement fund charged to results   1,558 1,827 3,546
Tax expense (income), continuing operations   $ 236,926 $ 298,074 $ 325,170
Effective income tax   46.32% 43.30% 73.09%