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Inventories (Tables)
 6 Months Ended
Jun. 30, 2023
Notes and other explanatory information [abstract]  
Schedule of inventories
       
     
    June 30, 2023   December 31, 2022
Finished products        
Iron Solutions   2,638   2,126
Energy Transition Metals   638   651
    3,276   2,777
         
Work in progress   901   800
Consumable inventory   1,157   1,010
         
Allowance to net realizable value (i)   (141)   (105)
Total of inventories   5,193   4,482

 

(i) In the six-month period ended June 30, 2023, the effect of allowance to net realizable value was US$47 (2022: US$22).