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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2022
Inventories |
Schedule of detailed information of inventories | ​
​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
​ | ​ | US$(000) | ​ | US$(000)
​ | ​ | ​ | ​ | ​
Finished goods |  | 1,267 |  | 1,396
Products in process (b) |  | 27,212 |  | 41,619
Spare parts and supplies |  | 89,708 |  | 86,825
​ |  | 118,187 |  | 129,840
Provision for impairment of inventory (c) |  | (29,842) |  | (30,774)
​ | ​ | ​ | ​ | ​
​ |  | 88,345 |  | 99,066
​ | ​ | ​ | ​ | ​
Classification by use: | ​ | ​ | ​ | ​
Current portion |  | 88,345 |  | 86,264
Non-current portion |  | — |  | 12,802
​ | ​ | ​ | ​ | ​
​ |  | 88,345 |  | 99,066
​
| (b) | Products in process primarily relate to mineral in process of El Brocal amounting to US$3.9 million (935,448 Dried Metric Ton amounting to US$29.1 million as of December 31, 2021). See note 1(b).
​
| (c) | The provision for impairment of inventory had the following movements:
Schedule of changes in provisions for impairment of inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | US$(000) | ​ | US$(000) | ​ | US$(000)
​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance |  | 30,774 |  | 31,117 |  | 25,402
Continuing operations: | ​ | ​ | ​ | ​ | ​ | ​
Finished and in progress goods, note 21(a) - |  | ​ |  | ​ |  | ​
Provision |  | 7,243 |  | 6,877 |  | 8,920
Reversal |  | (8,314) |  | (12,348) |  | (3,866)
​ | ​ | (1,071) |  | (5,471) |  | 5,054
Spare parts and supplies, note 28(a) - |  | ​ | ​ | ​ | ​ | ​
Provision | ​ | 22,533 | ​ | 22,394 | ​ | 17,266
Reversal |  | (22,394) |  | (17,266) |  | (15,762)
​ |  | 139 |  | 5,128 |  | 1,504
Discontinued operations: | ​ | ​ | ​ | ​ | ​ | ​
Spare parts and supplies, note 1(e) - | ​ | ​ | ​ | ​ | ​ | ​
Provision | ​ | — | ​ | — | ​ | 1,220
Reversal | ​ | — |  | — |  | (843)
​ |  | — | ​ | — | ​ | 377
Sale of discontinued mining unit, note 1(e) - | ​ | — | ​ | — | ​ | (1,220)
Final balance |  | 29,842 |  | 30,774 |  | 31,117
​
Sociedad Minera Cerro Verde S.A.A. |
Inventories |
Schedule of detailed information of inventories | This item is made up as follows: ​
​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022 |  | December 31, 2021
​ | ​ | US$(000) | ​ | US$(000)
​ | ​ | ​ | ​ | ​
Current | ​ | ​ | ​ | ​
Materials and supplies |  | 411,656 |  | 369,324
Work-in-process (WIP) (a) |  | 200,969 |  | 170,669
Finished goods: | ​ | ​ | ​ | ​
Copper concentrate | ​ | 23,012 | ​ | 9,734
Copper cathode |  | 10,976 |  | 15,708
Molybdenum concentrate |  | 3,598 |  | 1,776
​ |  | 650,211 |  | 567,211
Non-current | ​ | ​ | ​ | ​
WIP (a) |  | 287,218 |  | 323,828
​ | ​ | ​ | ​ | ​
Total inventories |  | 937,429 |  | 891,039
| (a) | WIP inventories represent mill and 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 non-current. 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. During 2022, the Company recorded metal inventory adjustments totaling US$7.7 million associated with the write-off of certain long-term mill and leach stockpiles. No metal inventory adjustments were recorded in 2021.

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