Deferred exploration and evaluation expenditure (Tables)

12 Months Ended

Dec. 31, 2025

Notes and other explanatory information [abstract]

Schedule of exploration costs

	12/31/2025		12/31/2024
Opening balance		47,141		56,016
Exploration and feasibility investments		1,194		3,186
Share based compensation of exploration and feasibility personnel		530		1,267
Additions		1,724		4,453
Disposal		—		(342	)
Asset retirement cost		67		(100	)
Foreign currency translation adjustment of subsidiaries		5,942		(12,886	)
Closing balance		54,874		47,141