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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

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