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Inventories
 12 Months Ended
Dec. 31, 2022
Inventories Abstract  
Inventories

 

8.Inventories

 

   
  2022 2021
Consumables                26,494 20,585
Parts and maintenance materials              365,659 201,470
Advances to suppliers                46,712 47,530
Total              438,865 269,585

 

The changes in the provision for obsolescence are as follows:

 

   
  2022 2021
Balances at the beginning of the year                 (6,176) (12,862)
Additions                 (4,876) (687)
Write-offs                  1,441 7,373
Balances at the end of the year                 (9,611) (6,176)