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RELATED-PARTY BALANCES AND TRANSACTIONS (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Sales R$ 2,711,660 R$ 3,521,245  
Cost and expenses (1,754,370) (1,394,305)  
Interest 174,183 81,790  
Exchange rate variations and monetary, net (13,584)    
Financial investments [1] (1,198,164) 94,866  
Net income for the year 2,167,698 13,595,621 R$ 4,292,618
C S N Mineracao S A [Member]      
IfrsStatementLineItems [Line Items]      
Dividends receivable 59,469 320,945  
Mineracao Nacional S A [Member]      
IfrsStatementLineItems [Line Items]      
Dividends receivable 14,785 56,344  
Transnordestina Logistica [Member]      
IfrsStatementLineItems [Line Items]      
Loan receivable 1,384,773 1,123,375  
Others assets R$ 1,484,759 927,076  
Transnordestina Logistica [Member] | Bottom of range [member]      
IfrsStatementLineItems [Line Items]      
Average rate 125.00%    
Transnordestina Logistica [Member] | Top of range [member]      
IfrsStatementLineItems [Line Items]      
Average rate 130.00%    
Subsidiaries Joint Ventures Associates Exclusive Funds And Other Related Partie [Member]      
IfrsStatementLineItems [Line Items]      
Sales R$ 234,150 274,978  
Cost and expenses (66) (1,065)  
Interest   251  
Net income for the year 234,084 274,164  
Joint-ventures e joint operation [member]      
IfrsStatementLineItems [Line Items]      
Sales 34,924 2,250  
Cost and expenses (1,538,194) (1,273,740)  
Interest 144,355 49,293  
Net income for the year (1,358,915) (1,222,197)  
Other related parties [member]      
IfrsStatementLineItems [Line Items]      
Sales 2,442,586 3,244,017  
Cost and expenses (216,110) (119,500)  
Interest 29,828 32,246  
Exchange rate variations and monetary, net (13,584)    
Financial investments [1] (1,198,164) 94,866  
Net income for the year 1,044,556 3,251,629  
Related parties [member]      
IfrsStatementLineItems [Line Items]      
Net income for the year R$ (80,275) R$ 2,303,596  
[1] Financial investments: Refers mainly to investments in Usiminas shares, cash and cash equivalents and Bonds with Banco Fibra and government bonds and CDBs with the exclusive funds.