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Inventories, net (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Inventory, net |  |  |  |  |
Finished goods |  | $ 2,525 | $ 2,084 | $ 4,640 |
Products in process | [1] | 52,619 | 47,652 |  |
Spare parts and supplies |  | 76,937 | 74,033 |  |
Inventory gross |  | 132,081 | 123,769 |  |
Provision for impairment of value of inventory |  | (31,117) | (25,402) |  |
Finished goods [Abstract] |  |  |  |  |
Current portion |  | 77,327 | 97,973 |  |
Inventories, net |  | 23,637 | 394 |  |
Inventories |  | 100,964 | 98,367 |  |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Inventory, net |  |  |  |  |
Inventory gross |  | 58,892 | 60,343 |  |
Allowance for obsolescence of materials and supplies (b) |  | (6,595) | (6,098) | $ (7,515) | $ (7,076)
Finished goods [Abstract] |  |  |  |  |
Current portion |  | 52,297 | 54,245 |  |
Inventories |  | 52,297 | 54,245 |  |
Minera Yanacocha SRL and subsidiary [Member] | Precious metals [Member] |  |  |  |  |
Inventory, net |  |  |  |  |
Inventory gross |  | 12,559 | 8,021 |  |
Minera Yanacocha SRL and subsidiary [Member] | Leach in circuit [Member] |  |  |  |  |
Inventory, net |  |  |  |  |
Inventory gross |  | 3,117 | 5,158 |  |
Minera Yanacocha SRL and subsidiary [Member] | Mill in circuit [Member] |  |  |  |  |
Inventory, net |  |  |  |  |
Inventory gross |  | 2,093 | 1,332 |  |
Minera Yanacocha SRL and subsidiary [Member] | Supplies |  |  |  |  |
Inventory, net |  |  |  |  |
Inventory gross |  | 41,123 | 45,832 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Inventory, net |  |  |  |  |
Products in process | [2] | 176,813 | 173,190 |  |
Finished goods [Abstract] |  |  |  |  |
Copper cathode |  | 3,826 | 6,321 |  |
Copper concentrate |  | 16,563 | 23,890 |  |
Molybdenum concentrate |  | 700 | 1,268 |  |
Less: Provision for obsolescence of materials and supplies |  | (104) | (507) |  |
Current portion |  | 566,794 | 552,197 |  |
Inventories, net | [2] | 301,075 | 255,123 |  |
Inventories |  | 867,869 | 807,320 |  |
Materials and supplies |  | $ 368,996 | $ 348,035 |  |
[1] | Products in process include mainly to mineral in process of El Brocal for 1,527,521 Dried Metric Ton (DMT) amounting to US$32.2 million (1,592,905 DMT amounting to US$31.2 million as of December 31, 2019).
[2] | WIP 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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