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Tax situation - Income tax provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Income Tax Explanatory      
Current income tax expense $ 9,924 $ 11,911 $ 16,882
Deferred tax expense (income) 15,506 (37,501) 9,997
Income tax expense (benefit) 25,430 (25,590) 26,879
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Income Tax Explanatory      
Current Peruvian tax returns 51,197 42,978 12,701
Royalties and mining taxes 5,065 11,444 8,888
Income tax from prior years (refunds)/payments (1,712) 8,459 8,269
Other taxes 1,363 993 510
Income tax prior years refunds (2,895) (3,002) 0
Fines from prior years 0 4,056 0
Current income tax expense 53,018 64,928 30,368
Deferred tax expense (income) 0 0 (1,071)
Income tax expense (benefit) $ 53,018 $ 64,928 $ 29,297