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7. INVENTORIES (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
InventoriesLineItems [Line Items]    
(-) Provision for losses R$ (109,038) R$ (134,553)
Inventoy, net 5,164,890 5,427,249
Current 4,817,586 5,282,750
Non-current 347,304 144,499
Work in progress [member]    
InventoriesLineItems [Line Items]    
Inventory gross [1] 1,358,905 1,438,868
Finished goods [member]    
InventoriesLineItems [Line Items]    
Inventory gross 1,627,676 1,691,842
Raw materials [member]    
InventoriesLineItems [Line Items]    
Inventory gross 1,289,653 1,493,129
Spare parts [member]    
InventoriesLineItems [Line Items]    
Inventory gross 928,158 902,135
Advances to suppliers [member]    
InventoriesLineItems [Line Items]    
Inventory gross R$ 69,536 R$ 35,828
[1] Long-term iron ore inventories that will be used after the construction of the processing plant, which will produce pellet feed, In 2020, the Company defined the construction project for the new plant for processing Itabirito, which until then was considered as waste, and started to be incorporated into the long-term ore inventory.