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Inventories - Impairment of value of inventory (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Inventories. |  |  |
Beginning Balance | $ 30,774 | $ 31,117 | $ 25,402
Provision for finished and in progress goods, note 21(a) | (7,243) | (6,877) | (8,920)
Reversal for finished and in progress goods, note 21(a) | (8,314) | (12,348) | (3,866)
Total of provision (reversal) for finished and in progress goods | (1,071) | (5,471) | 5,054
Provision for spare parts and supplies, note 28(a) | 22,533 | 22,394 | 17,266
Reversal for spare parts and supplies, note 28(a) | (22,394) | (17,266) | (15,762)
Provision (reversal) for impairment of spare parts and supplies | 139 | 5,128 | 1,504
Provision for Spare parts and supplies, note 1(e) | 0 | 0 | 1,220
Reversal for spare parts and supplies, note 1(e) | 0 | 0 | (843)
Provision reversal for impairment of inventory of spare parts and supplies | 0 | 0 | 377
Sale of discontinued mining unit, note 1(e) | 0 | 0 | (1,220)
Final balance | $ 29,842 | $ 30,774 | $ 31,117

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