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Inventory, net (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventory, net |
Schedule of detailed information of inventories | This caption is made up as follows:
|  | 2020 |  | 2019
|  | US$(000) |  | US$(000)
Finished goods |  | 2,525 |  | 2,084
Products in process (b) |  | 52,619 |  | 47,652
Spare parts and supplies |  | 76,937 |  | 74,033
|  | 132,081 |  | 123,769
Provision for impairment of value of inventory (c) |  | (31,117) |  | (25,402)
|  | 100,964 |  | 98,367
Classification by use: |  |  |  |
Current portion |  | 77,327 |  | 97,973
Non-current portion |  | 23,637 |  | 394
|  | 100,964 |  | 98,367
(b)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$31.2 million as of December 31, 2019). (c)The provision for impairment of value of inventory had the following movement:
Schedule of impairment of assets | The provision for impairment of value of inventory had the following movement:
|  | 2020 |  | 2019 |  | 2018
|  | US$(000) |  | US$(000) |  | US$(000)
Beginning balance |  | 25,402 |  | 23,163 |  | 11,603
Continuing operations: |  |  |  |  |  |
Provision for impairment of finished and in progress goods, note 21(a) |  | 8,920 |  | 7,329 |  | 4,640
Reversal for impairment of finished and in progress goods, note 21(a) |  | (3,866) |  | (9,472) |  | (119)
Provision for impairment of spare parts and supplies, note 26(a) |  | 17,266 |  | 15,703 |  | 11,704
Reversal for impairment of spare parts and supplies, note 26(a) |  | (15,762) |  | (11,641) |  | (4,665)
Sale of mining unit, note 1(e) |  | (1,220) |  | — |  | —
Discontinued operations, note 1(e): |  |  |  |  |  |
Provision for impairment of spare parts and supplies |  | 1,220 |  | 843 |  | —
Reversal for impairment of spare parts and supplies |  | (843) |  | (523) |  | —
Final balance |  | 31,117 |  | 25,402 |  | 23,163
Minera Yanacocha SRL and subsidiary [Member] |
Inventory, net |
Schedule of detailed information of inventories | (a)This caption is made up as follows:
|  | 2020 |  | 2019
|  | US$(000) |  | US$(000)
Precious metals |  | 12,559 |  | 8,021
Leach in-circuit |  | 3,117 |  | 5,158
Mill in-circuit |  | 2,093 |  | 1,332
Materials and supplies |  | 41,123 |  | 45,832
|  | 58,892 |  | 60,343
Allowance for obsolescence of materials and supplies (b) |  | (6,595) |  | (6,098)
|  | 52,297 |  | 54,245
Schedule Of Detailed Information About Mineral Deposits Inventory | The allowance for obsolescence of material and supplies had the following movement during the years 2020, 2019 and 2018:
|  | 2020 |  | 2019 |  | 2019
|  | US$(000) |  | US$(000) |  | US$(000)
Opening balance |  | 6,098 |  | 7,515 |  | 7,076
Provision for impairment of materials and supplies |  | 1,459 |  | 1,898 |  | 1,887
Reversal of provision for impairment of materials and supplies |  | (962) |  | (3,315) |  | (1,448)
Ending balance |  | 6,595 |  | 6,098 |  | 7,515
Sociedad Minera Cerro Verde S.A.A. [Member] |
Inventory, net |
Schedule of detailed information of inventories | This item is made up as follows:
|  | December 31, 2020 |  | December 31, 2019
|  | US$(000) |  | US$(000)
Current |  |  |  |
Materials and supplies |  | 368,996 |  | 348,035
Work-in-process (WIP) (a) |  | 176,813 |  | 173,190
Finished goods: |  |  |  |
Copper concentrate |  | 16,563 |  | 23,890
Copper cathode |  | 3,826 |  | 6,321
Molybdenum concentrate |  | 700 |  | 1,268
Less: Provision for obsolescence of materials and supplies |  | (104) |  | (507)
|  | 566,794 |  | 552,197
Non-current |  |  |  |
Work-in-process (WIP) (a) |  | 301,075 |  | 255,123
Total inventories |  | 867,869 |  | 807,320
(a)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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