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Costs applicable to sales (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Depreciation and amortization $ (213,722,000) $ (192,647,000) $ (232,583,000)
Reclamation expenses related to leach pads, note 12(b) 109 78,000,000  
Cost of sales of goods, excluding depreciation and amortization (980,254,000) (824,973,000) (922,572,000)
Minera Yanacocha SRL and subsidiary [Member]      
Beginning balance of finished goods and in-process 446,503,000 544,325,000 660,763,000
Beginning balance of provision for net realizable value, note 8(b) (84,374,000) (90,298,000) (163,094,000)
Consumption of supplies 240,881,000 228,376,000 210,384,000
Personnel expenses 99,702,000 87,258,000 102,867,000
Other services 66,408,000 73,779,000 82,787,000
Maintenance 24,033,000 36,213,000 38,646,000
Power 23,565,000 27,270,000 27,713,000
Depreciation and amortization 87,783,000 140,712,000 223,142,000
Workers' profit participation 1,242,000 12,394,000 28,852,000
Reclamation expenses related to leach pads, note 12(b) 124,124,000 78,494,000 0
Ending balance of provision for net realizable value, note 8(b) 62,540,000 (84,374,000) (90,298,000)
Ending balance of finished goods and in-process (345,489,000) 446,503,000 544,325,000
Cost of sales of goods, excluding depreciation and amortization $ 746,918,000 $ 776,394,000 $ 758,033,000