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Administrative expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of administrative expense [Line Items]      
Administrative expenses $ 83,597 $ 81,692 $ 84,372
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses 4,760 8,780 20,028
Management expenses [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses 3,395 7,191 18,108
Others [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,365 1,589 1,920
Personnel expenses      
Disclosure of administrative expense [Line Items]      
Administrative expenses 36,265 29,617 33,036
Sundry charges      
Disclosure of administrative expense [Line Items]      
Administrative expenses 12,510 15,531 21,248
Professional fees      
Disclosure of administrative expense [Line Items]      
Administrative expenses 12,663 11,696 10,364
Rentals      
Disclosure of administrative expense [Line Items]      
Administrative expenses 5,412 4,870 4,009
Donations      
Disclosure of administrative expense [Line Items]      
Administrative expenses 3,006 4,280 3,336
Insurance      
Disclosure of administrative expense [Line Items]      
Administrative expenses 3,911 3,023 5,105
Allowance for doubtful accounts      
Disclosure of administrative expense [Line Items]      
Administrative expenses 676 5,087 903
Communications      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,376 1,557 1,281
Canons and tributes.      
Disclosure of administrative expense [Line Items]      
Administrative expenses 602 1,460 824
Maintenance and repairs      
Disclosure of administrative expense [Line Items]      
Administrative expenses 2,657 1,076 973
Board of Directors’ participation      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,422 1,140 1,055
Travel and mobility      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,053 914 787
Subscriptions and quotes      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,428 697 540
Consumption of materials and supplies      
Disclosure of administrative expense [Line Items]      
Administrative expenses 616 416 1,032
Provision (reversal) of stock appreciation’s rights      
Disclosure of administrative expense [Line Items]      
Administrative expenses $ 0 $ 328 $ (121)