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9. PROPERTY, PLANT AND EQUIPMENT (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 3,217,052 R$ 3,282,436
Logistics [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 81,944 89,595
Logistics [Member] | Current investments [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description Current investments for maintenance of current operations.    
Construction in progress R$ 81,944 89,595
Mining [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 1,577,217 1,859,108
Mining [Member] | Current investments [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description Current investments for maintenance of current operations.    
Construction in progress R$ 389,510 725,616
Mining [Member] | Expansion of Mine Capacity [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description [1] Expansion of Casa de Pedra Mine capacity production.    
Start date [1] 2007  
Completion date [1] 2020  
Construction in progress [1] R$ 883,742 844,194
Mining [Member] | Expansion of Export Capacity [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description [2] Expansion of TECAR export capacity.    
Start date [2] 2009  
Completion date [2] 2022  
Construction in progress [2] R$ 303,965 289,298
Steel [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 886,631 653,842
Steel [Member] | Current investments [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description [3] Current investments for maintenance of current operations.    
Construction in progress [3] R$ 811,049 558,922
Steel [Member] | Supply [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description Supply of 16 torpedo’s cars for operation in the steel industry  
Start date 2008  
Completion date 2020  
Construction in progress R$ 75,582 94,920
Cement [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 671,260 679,891
Cement [Member] | Current investments [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description Current investments for maintenance of current operations.    
Construction in progress R$ 93,548 94,728
Cement [Member] | Construction of Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Project description [4] Construction of cement plants.    
Start date [4] 2011  
Completion date [4] 2023  
Construction in progress [4] R$ 577,712 R$ 585,163
[1] Estimated completion date of the Central Plant Step 1;
[2] Estimated completion date of phase 60 Mtpa;
[3] Refers substantially to the technological modernization of the continuous running machines; increased efficiency in zinc plating lines and contractual agreement signed for the supply of new equipment;
[4] Refers substantially to the acquisition of new Integrated Cement Plants.