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DESCRIPTION OF BUSINESS (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended |  |  |  |  |
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Dec. 31, 2023 | Jun. 30, 2023 | Dec. 22, 2022 | Nov. 24, 2022 | Oct. 07, 2022 | Jul. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Description of production process | As a pioneer in the use of technologies that result in the possibility of stacking the tailings generated in the iron ore production process, CSN Mineração has had its iron ore production, since January 2020, 100% independent of tailings dams. After significant investments in recent years to increase the level of reliability, decharacterization and dry stacking, CSN Mineração has moved towards a scenario in which 100% of its waste goes through a dry filtration process and is arranged in geotechnically controlled piles, in areas exclusively intended for stacking. |  |  |  |  |
Increase in capital |  | R$ 2,383,276 |  |  |  |
Percentage of sale |  |  |  |  |  | 100.00%
Shares issued |  |  |  |  |  | 6,381,908
Percentage of equivalent |  |  |  |  |  | 66.23%
Number of common shares issued |  |  |  | 1,271 |  |
Number of preferred shares issued |  |  |  | 338 |  |
Companhia Florestal do Brasil [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Percentage of interest |  |  | 99.00% |  |  |
Companhia Energetica Chapeco [Member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Percentage of interest |  |  |  |  | 100.00% |

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