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Schedule of depreciation, amortization and depletion (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Production costs R$ 25,837,475 R$ 19,124,901 R$ 17,263,264
Sales expenses 2,372,298 2,004,417 2,342,805
General and Administrative Expenses 587,148 504,458 511,065
Other income and expenses (1,534,602) (5,224,682) (4,631,236)
Net 1,716,032 3,270,056 2,406,851
Depreciation Amortization And Depletion [Member]      
IfrsStatementLineItems [Line Items]      
Production costs [1] (2,075,488) (2,374,046) (1,385,306)
Sales expenses (11,227) (13,978) (11,539)
General and Administrative Expenses (27,966) (33,434) (24,859)
Total (2,114,681) (2,421,458) (1,421,704)
Other income and expenses [2] (97,725) (95,270) (97,627)
Net R$ (2,212,406) R$ (2,516,728) R$ (1,519,331)
[1] (i) The Company’s iron ore extraction in 2020 started using dry waste filtering and stacking in 100% of its production process. As a normal consequence of the operation, the use of dams has become obsolete, and consequently, the assets of dams reached the end of their useful lives on December 31, 2020. As a result of the technical and functional obsolescence of the dams, the book balance of these assets in their entirety, (R$515,491), was fully depreciated in 2020 and appropriated to the cost of production.
[2] They mainly refer to the depreciation of investment properties, paralyzed equipment and amortization of the SWT Client Portfolio, see note 28.