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Tax situation - Effective income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income Tax Explanatory      
Profit before income tax $ (43,535) $ 27,033 $ 92,667
Income tax rate 29.50% 32.00% 32.00%
Expected income tax expense $ 25,766 $ (22,462) $ (12,796)
Others (9,958) (3,466) (16,549)
Tax expense (income), continuing operations 25,590 (26,879) (17,888)
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure Of Income Tax Explanatory      
Profit before income tax $ 688,451 $ 444,880 $ 835,924
Income tax rate 32.00% 32.00% 32.00%
Expected income tax expense $ 220,304 $ 142,362 $ 267,496
Non - deductible expenses 28,181 25,352 25,217
Royalty case 0 143,728 (12,029)
Uncertain tax positions - IFRIC 23 20,767 0 0
Special mining tax and mining royalties (15,660) (25,165) (21,704)
Special mining burden (GEM) 0 (22,334) 0
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 32% to 31.18%) (2,746) (1,958) (1,632)
Income tax true - ups (10,255) (10,312) 10,210
Others 7,620 4,896 (4,125)
Current and deferred income tax charges to results 248,211 256,569 263,433
Mining taxes charged to results 48,036 65,055 213,280
Supplementary retirement fund charged to results 1,827 3,546 9,330
Tax expense (income), continuing operations $ 298,074 $ 325,170 $ 486,043
Effective income tax 43.30% 73.09% 58.14%