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Summary of Significant Accounting Policies - Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 15 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Summary of Significant Accounting Policies      
Sales     $ 0
Lower of cost or NRV adjustments $ 2,598 $ 1,139  
Cost of sales 2,598 1,139  
Gross profit (loss) (2,598) (1,139)  
Exploration and evaluation 1,044 903  
Development 9,743 11,552  
General and administration 2,173 2,569  
Accretion Expense 277 121  
Operating costs 13,237 15,145  
Operating profit (loss) (15,835) (16,284)  
Interest income 867 619  
Interest expense (266) (131)  
Mark to market gain (loss) 4,310 (2,756)  
Foreign exchange gain (loss)   12  
Other income (loss) 26 (1)  
Net income (loss) (10,898) (18,541)  
Single operating segment      
Summary of Significant Accounting Policies      
Lower of cost or NRV adjustments 2,598 1,139  
Cost of sales 2,598 1,139  
Gross profit (loss) (2,598) (1,139)  
Exploration and evaluation 1,044 903  
Development 9,743 11,552  
General and administration 2,173 2,569  
Accretion Expense 277 121  
Operating costs 13,237 15,145  
Operating profit (loss) (15,835) (16,284)  
Interest income 867 619  
Interest expense (266) (131)  
Mark to market gain (loss) 4,310 (2,756)  
Foreign exchange gain (loss)   12  
Other income (loss) 26 (1)  
Net income (loss) $ (10,898) $ (18,541)