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Exploration and Evaluation Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Exploration and Evaluation:    
Exploration and evaluation assets $ 26,449 $ 26,446
Commercial Plant Evaluation (Lanxess 1A)    
Acquisition:    
Balance, beginning of period 6,000  
Option payments 0  
Balance, period end 6,000  
Exploration and Evaluation:    
Balance, beginning period 20,446  
Lanxess 1A evaluation costs 3  
Balance, period end 20,449  
Exploration and evaluation assets $ 26,449 $ 26,446