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INVENTORIES - Summary of balances (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventories    
Work in process R$ 75,377 R$ 52,882
Raw materials 1,047,433 626,150
Spare Parts and other 488,410 226,354
Inventories 4,685,595 1,853,104
Pulp | Domestic    
Inventories    
Finished goods 575,335 167,317
Pulp | Foreign    
Inventories    
Finished goods 2,229,206 485,226
Paper | Domestic    
Inventories    
Finished goods 199,635 227,303
Paper | Foreign    
Inventories    
Finished goods R$ 70,199 R$ 67,872