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Additional information on the cash flow statement (Tables)
12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of non-cash effects
          
   12/31/2025  12/31/2024
Addition to property, plant, and equipment in exchange for:          
Lease   2,673    2,213 
Suppliers   5,662       
Stock-based compensation   (74)      
Related parties         163 
Asset retirement obligation - ARO   305    614 
    8,566    2,990 
           
Addition to exploration and evaluation assets in exchange for:          
Stock-based compensation   530    1,267 
Asset retirement obligation - ARO   67    (100)
Depreciation and depletion of assets   199    40 
           
    796    1,207 
Non-cash effects   9,362    4,197