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Mineral exploration and project evaluation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]      
Mineral exploration $ (48,855) $ (57,988) $ (61,925)
Project evaluation (19,121) (41,624) (36,876)
Mineral exploration and Project development  $ (67,976) $ (99,612) $ (98,801)