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Tax situation - Income tax provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income Tax Explanatory      
Current income tax expense $ 11,911 $ 16,882 $ 23,713
Deferred income tax expense (benefit) (37,501) 9,997 (5,825)
Income tax expense (benefit) 25,590 (26,879) (17,888)
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Income Tax Explanatory      
Current Peruvian tax returns 42,978 12,525 3,877
Royalties and mining taxes 11,444 8,822 4,944
Other taxes 993 121 211
Income tax prior year adjustments 8,459 8,900 (2,006)
Fines from prior years, note 24 4,056 0 0
Income tax prior years refunds (3,002) 0 0
Current income tax expense 64,928 30,368 7,026
Deferred income tax expense (benefit) 0 (1,071) 0
Income tax expense (benefit) $ 64,928 $ 29,297 $ 7,026