v3.26.3
Segment Reporting - Schedule of Segment Expense and Reconciled to Net Loss Before Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Operating expenses:          
Exploration expenses $ 11,614   $ 1,755 $ 18,245 $ 1,920
General and administrative expenses 3,946   2,697 14,836 3,215
Depreciation expense 62   4 121 7
Total operating expenses 15,622   4,546 33,202 5,389
Operating loss (15,622)   (4,546) (33,202) (5,389)
Corporate and other expenses (3,782)   (2,487) (14,109) (2,803)
Transaction costs 0   (90) 0 (247)
Interest income 364   52 994 52
Interest expense (19)   (79) (93) (138)
Foreign currency transaction gain/(loss) 0   0 (3) 0
Change in fair value of SAFE 0   0 (4,625) 0
Change in fair value of warrants 4,437   61 (3,482) 61
Loss before income taxes (10,840) $ (10,840) (4,512) (40,411) (5,414)
Operating Segments          
Operating expenses:          
Exploration expenses 11,614   1,755 18,245 1,920
General and administrative expenses 166   210 729 412
Depreciation expense 60   4 119 7
Total operating expenses 11,840   1,969 19,093 2,339
Operating loss (11,840)   (1,969) (19,093) (2,339)
United States Mining Operations | Operating Segments          
Operating expenses:          
Exploration expenses 3,537   578 9,153 578
General and administrative expenses 32   7 61 7
Depreciation expense 55   3 109 3
Total operating expenses 3,624   588 9,323 588
Operating loss (3,624)   (588) (9,323) (588)
Brazil Mining Operations | Operating Segments          
Operating expenses:          
Exploration expenses 8,077   1,177 9,092 1,342
General and administrative expenses 134   203 668 405
Depreciation expense 5   1 10 4
Total operating expenses 8,216   1,381 9,770 1,751
Operating loss $ (8,216)   $ (1,381) $ (9,770) $ (1,751)