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Administrative expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of administrative expense [Line Items]      
Administrative expenses $ 78,760 $ 83,597 $ 81,692
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses 2,783 4,760 8,780
Management expenses [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,317 3,395 7,191
Others [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,466 1,365 1,589
Personnel expenses      
Disclosure of administrative expense [Line Items]      
Administrative expenses 34,656 36,265 29,617
Professional fees      
Disclosure of administrative expense [Line Items]      
Administrative expenses 15,324 12,663 11,696
Sundry charges      
Disclosure of administrative expense [Line Items]      
Administrative expenses 7,450 10,375 15,295
Rentals      
Disclosure of administrative expense [Line Items]      
Administrative expenses 5,818 5,412 4,870
Board of Directors' participation      
Disclosure of administrative expense [Line Items]      
Administrative expenses 3,252 1,422 1,140
Maintenance and repairs      
Disclosure of administrative expense [Line Items]      
Administrative expenses 2,732 2,657 1,076
Subscriptions and quotes      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,938 1,428 697
Donations      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,617 3,006 4,280
Communications      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,512 1,376 1,557
Depreciation and amortization      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,295 1,146 254
Transport      
Disclosure of administrative expense [Line Items]      
Administrative expenses 1,212 989 310
Insurance      
Disclosure of administrative expense [Line Items]      
Administrative expenses 645 3,911 3,023
Travel and mobility      
Disclosure of administrative expense [Line Items]      
Administrative expenses 467 1,053 914
Consumption of materials and supplies      
Disclosure of administrative expense [Line Items]      
Administrative expenses 436 616 416
Canons and tributes.      
Disclosure of administrative expense [Line Items]      
Administrative expenses 388 602 1,460
Allowance for doubtful accounts      
Disclosure of administrative expense [Line Items]      
Administrative expenses $ 18 $ 676 $ 5,087