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Inventory, net (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of inventory net [Line Items] |  |  |  |
Finished goods |  | $ 7,715 | $ 6,151 | $ 0
Products in process | [1] | 73,796 | 56,190 |
Spare parts and supplies |  | 81,383 | 84,787 |
Inventory gross |  | 162,894 | 147,128 |
Provision for impairment of value of inventory | [2] | (23,163) | (11,603) |
Finished goods [Abstract] |  |  |  |
Current inventories |  | 135,919 | 132,287 |
Inventories, net |  | 3,812 | 3,238 |
Inventories |  | 139,731 | 135,525 |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Inventory gross |  | 62,042 | 77,722 |
Allowance for obsolescence of materials and supplies |  | (7,515) | (7,076) |
Finished goods [Abstract] |  |  |  |
Inventories |  | 54,527 | 70,646 |
Minera Yanacocha SRL and subsidiary [Member] | Precious metals [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Inventory gross |  | 6,878 | 15,446 |
Minera Yanacocha SRL and subsidiary [Member] | Leach in circuit [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Inventory gross |  | 1,835 | 8,057 |
Minera Yanacocha SRL and subsidiary [Member] | Mill in circuit [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Inventory gross |  | 4,002 | 2,048 |
Minera Yanacocha SRL and subsidiary [Member] | Materials and supplies [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Inventory gross |  | 49,327 | 52,171 |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of inventory net [Line Items] |  |  |  |
Products in process | [3] | 149,975 | 148,928 |
Finished goods [Abstract] |  |  |  |
Copper cathode |  | 8,035 | 4,032 |
Copper concentrate |  | 17,949 | 18,068 |
Molybdenum concentrate |  | 3,205 | 1,896 |
Less: Provision for obsolescence of materials and supplies |  | (11) | (1,237) |
Current inventories |  | 487,531 | 445,626 |
Inventories, net | [3] | 255,918 | 248,452 |
Inventories |  | 743,449 | 694,078 |
Materials and supplies |  | $ 308,378 | $ 273,939 |
[1] | Products in process include mineral deposits located in the Tajo Norte mining unit (El Brocal). The detail of this mineral as of December 31, 2018 and 2017 is presented below:
[2] | The provision for impairment of value of inventory had the following movement during the years 2018, 2017 and 2016:
[3] | 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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