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Schedule of Fair value of assets acquired and liabilities assumed (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Property, plant and equipment R$ 21,531,134 R$ 19,716,223 R$ 19,700,944
Carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Cash and cash equivalents 52,570 2,197  
 Trade receivables  27,571 1,027  
Receivables from related parties 96,374 9,035  
Inventories 44,157 1,017  
Recoverable taxes  18,616 931  
Short-term investments 14,689    
 Other assets  17,734 673  
Investment   40,653  
 Property, plant and equipment  373,574 15,092  
 Intangíible assets  798 500  
 Total assets acquired  646,083 71,125  
Borrowings and financing  198,778 182,402  
Trade payables 22,735 446  
 Taxes payable  19,202 37,158  
Debits with related parties    96,350  
 Other payables  44,052 7,257  
 Total liabilities assumed  284,767 323,613  
 Net equity acquired  361,316 (252,488)  
Indirect investiment (40,663)    
 Net equity acquired  320,653 (252,488)  
Property, plant and equipment 388,666    
Mining rights 500    
Licenses 798    
Total 389,964    
Fair Value Adjustments [Member]      
IfrsStatementLineItems [Line Items]      
Investment   24,845  
 Property, plant and equipment  161,367 77,089  
 Intangíible assets  59,456 269,385  
 Total assets acquired  220,823 371,319  
 Net equity acquired  220,823 371,319  
Indirect investiment (24,851)    
 Net equity acquired  195,972 371,319  
Property, plant and equipment 238,456    
Mining rights 269,385    
Licenses 59,456    
Total 567,297    
Total Fair Value [Member]      
IfrsStatementLineItems [Line Items]      
Cash and cash equivalents 52,570 2,197  
 Trade receivables  27,571 1,027  
Receivables from related parties 96,374 9,035  
Inventories 44,157 1,017  
Recoverable taxes  18,616 931  
Short-term investments 14,689    
 Other assets  17,734 673  
Investment   65,498  
 Property, plant and equipment  534,941 92,181  
 Intangíible assets  60,254 269,885  
 Total assets acquired  866,906 442,444  
Borrowings and financing  198,778 182,402  
Trade payables 22,735 446  
 Taxes payable  19,202 37,158  
Debits with related parties    96,350  
 Other payables  44,052 7,257  
 Total liabilities assumed  284,767 323,613  
 Net equity acquired  582,139 118,831  
Indirect investiment (65,514)    
 Net equity acquired  516,625 R$ 118,831  
Property, plant and equipment 627,122    
Mining rights 269,885    
Licenses 60,254    
Total R$ 957,261    
Business Property Plant And Equipment [Member]      
IfrsStatementLineItems [Line Items]      
Description of basis of valuation of assets available for benefits Valued using the "MARKET APPROACH" method, where the fair value of the asset is estimated by comparing it with similar or comparable assets that have been sold or listed for sale in the primary or secondary market.     
Business Mining Rights [Member]      
IfrsStatementLineItems [Line Items]      
Description of basis of valuation of assets available for benefits Evaluated by the MPEEM method that measures the present value of future income to be generated during the remaining useful life of a given asset. Using the analysis of the company's projected results as a reference, the pre-tax cash flows directly attributable to the asset are calculated, as of the base date stipulated in the evaluation.     
Business Licenses [Member]      
IfrsStatementLineItems [Line Items]      
Description of basis of valuation of assets available for benefits Valued using the WITH / WITHOUT method, which estimates the intangible value by the difference between discounted cash flow models with and without the asset.