v3.26.1
Share-Based Compensation - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Share-Based Compensation      
Aggregate vested units outstanding 81,761   81,198
Restricted Stock Units ("RSUs")      
Share-Based Compensation      
Granted 543,920 11,999,006 35,381,992
Total unrecognized share-based compensation expense $ 71.2   $ 91.5
Share based compensation expense 20.1 $ 5.4  
Restricted Stock Units ("RSUs") | General and administration expenses      
Share-Based Compensation      
Share based compensation expense 14.6 3.5  
Restricted Stock Units ("RSUs") | Exploration and evaluation activities      
Share-Based Compensation      
Share based compensation expense $ 5.5 $ 1.9  
Vesting Immediately | Restricted Stock Units ("RSUs")      
Share-Based Compensation      
Granted 543,920 2,619,585  
Shares issued 539,437 2,469,585  
Amount to settle liabilities $ 3.2 $ 4.1  
Weighted average grant date fair value $ 5.87 $ 1.68  
Vesting Immediately | Restricted Stock Units ("RSUs") | Consultant      
Share-Based Compensation      
Granted   150,000  
Share based compensation expense   $ 0.3  
Vesting fully within and on first anniversary of the grant date | Restricted Stock Units ("RSUs")      
Share-Based Compensation      
Granted   60,000  
Vesting in thirds on each anniversary of the grant date | Restricted Stock Units ("RSUs")      
Share-Based Compensation      
Granted   8,818,935  
Vesting in fourths on each anniversary of the grant date | Restricted Stock Units ("RSUs")      
Share-Based Compensation      
Granted   176,302  
Vesting based on market conditions | Restricted Stock Units ("RSUs")      
Share-Based Compensation      
Granted   324,184