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Inventory, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of inventory net [Line Items] |  |  |
Finished goods |  | $ 6,151 | $ 12,763
Products in process |  | 56,190 | 66,651
Spare parts and supplies |  | 84,787 | 63,946
Provision for impairment of value of inventory (b) |  | (11,603) | (8,386)
Inventory gross |  | 147,128 | 143,360
Finished goods [Abstract] |  |  |
Current inventories |  | 132,287 | 120,947
Inventories, net |  | 3,238 | 14,027
Inventories |  | 135,525 | 134,974
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure of inventory net [Line Items] |  |  |
Inventory gross |  | 77,722 | 76,570
Allowance for obsolescence of materials and supplies |  | (7,076) | (5,272)
Finished goods [Abstract] |  |  |
Inventories |  | 70,646 | 71,298
Minera Yanacocha SRL and subsidiary [Member] | Precious metals [Member] |  |  |
Disclosure of inventory net [Line Items] |  |  |
Inventory gross |  | 15,446 | 15,012
Minera Yanacocha SRL and subsidiary [Member] | Leach in circuit [Member] |  |  |
Disclosure of inventory net [Line Items] |  |  |
Inventory gross |  | 8,057 | 6,378
Minera Yanacocha SRL and subsidiary [Member] | Mill in circuit [Member] |  |  |
Disclosure of inventory net [Line Items] |  |  |
Inventory gross |  | 2,048 | 2,493
Minera Yanacocha SRL and subsidiary [Member] | Materials and supplies [Member] |  |  |
Disclosure of inventory net [Line Items] |  |  |
Inventory gross |  | 52,171 | 52,687
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of inventory net [Line Items] |  |  |
Products in process | [1] | 148,928 | 148,178
Finished goods [Abstract] |  |  |
Copper cathode |  | 4,032 | 8,220
Copper concentrate |  | 18,068 | 15,073
Molybdenum concentrate |  | 1,896 | 2,763
Less: Provision for obsolescence of materials and supplies |  | (1,237) | (303)
Current inventories |  | 445,626 | 425,566
Inventories, net | [1] | 248,452 | 300,614
Inventories |  | 694,078 | 726,180
Materials and supplies |  | $ 273,939 | $ 251,635
[1] | Work-in-process inventories represent mill and leach stockpiles which contain higher grade ores (mill stockpiles) and medium and lower grade ores (leach stockpiles) that have been extracted from the open pit and are available for copper recovery. Based on the future mine plan production, the Company identifies the portion of inventory that is classified as current or long term. For mill stockpiles, recovery is through milling and concentrating. For leach stockpiles, recovery is through exposure to acidic solutions that dissolve copper and deliver it in a solution to extraction processing facilities.

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