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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Income Taxes      
Federal tax rate 21.00%    
Minerals tax rate 5.00%    
Mining and income tax expense $ 1,548 $ 426  
Uncertain tax positions 0    
Valuation allowance $ 0   $ 0