v3.26.1
Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of reconciliation of changes in intangible assets
       
        2025
  Goodwill (i) Rights to use natural resources Others Total
 Balance at the beginning of the year 305,397 507,491 21,799 834,687
 Cost 316,087 1,810,609 49,896 2,176,592
 Accumulated amortization and impairment (10,690) (1,303,118) (28,097) (1,341,905)
 Balance at the beginning of the year 305,397 507,491 21,799 834,687
 Additions - - 1,994 1,994
 Disposals and write-offs - - (1) (1)
 Amortization - (48,122) (3,627) (51,749)
 Impairment reversal of long-lived assets - 83,817 26 83,843
 Foreign exchange effects 811 6,844 2,523 10,178
 Effect of new subsidiary acquisition - - 7 7
 Transfers - (1,184) 153 (1,031)
 Balance at the end of year 306,208 548,846 22,874 877,928
 Cost 318,239 1,844,122 51,630 2,213,991
 Accumulated amortization and impairment (12,031) (1,295,276) (28,756) (1,336,063)
 Balance at the end of year 306,208 548,846 22,874 877,928
         
 Average annual depreciation rates % -  UoP 5  
        2024
  Goodwill (i) Rights to use natural resources Others Total
 Balance at the beginning of the year 307,112 579,551 22,616 909,279
 Cost 630,787 1,859,147 53,865 2,543,799
 Accumulated amortization and impairment (323,675) (1,279,596) (31,249) (1,634,520)
 Balance at the beginning of the year 307,112 579,551 22,616 909,279
 Additions - - 5,748 5,748
 Disposals and write-offs - (226) (116) (342)
 Amortization - (65,710) (2,435) (68,145)
 Impairment reversal of long-lived assets - 9,534 - 9,534
 Foreign exchange effects (1,715) (15,433) (5,152) (22,300)
 Transfers - (225) 1,138 913
 Balance at the end of year 305,397 507,491 21,799 834,687
 Cost 316,087 1,810,609 49,896 2,176,592
 Accumulated amortization and impairment (10,690) (1,303,118) (28,097) (1,341,905)
 Balance at the end of year 305,397 507,491 21,799 834,687
         
 Average annual depreciation rates % -  UoP 5  
         

(i) As of December 31, 2025, the Company’s recognized goodwill balances were as follows: USD 95,411 (2024 - USD 95,087) allocated to Cajamarquilla CGU, USD 4,374 (2023 - USD 3,887) allocated to Juiz de Fora, and USD 206,423 (2024 - USD 206,423) allocated to the Mining Peru group of CGUs.