XML 576 R134.htm IDEA: XBRL DOCUMENT v3.22.1
Inventories - Impairment of value of inventory (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Inventories.      
Beginning Balance $ 31,117 $ 25,402 $ 23,163
Provision for finished and in progress goods, note 21(a) (6,877) (8,920) (7,329)
Reversal for finished and in progress goods, note 21(a) (12,348) (3,866) (9,472)
Total of provision (reversal) for finished and in progress goods (5,471) 5,054 (2,143)
Provision for spare parts and supplies, note 28(a) 22,394 17,266 15,703
Reversal for spare parts and supplies, note 28(a) (17,266) (15,762) (11,641)
Provision (Reversal) For Impairment Of Spare Parts And Supplies 5,128 1,504 4,062
Provision for spare parts and supplies 0 1,220 843
Reversal Spare parts and supplies 0 (843) (523)
Provision Reversal For Impairment Of Inventory Of Spare Parts And Supplies 0 377 320
Sale of mining unit, note 1(e) 0 (1,220) 0
Final balance $ 30,774 $ 31,117 $ 25,402