| Asset Retirement Obligation | 9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Asset Retirement Obligation Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Asset Retirement Obligation | Asset Retirement Obligation The following table summarizes changes in the Company’s Asset retirement obligation (in thousands): 
 For both the three and nine months ended September 30, 2025, the Company recognized a decrease in its Asset retirement obligation in accordance with the change in estimate of $2.7 million due to the change in timing of the anticipated reclamation activities. During the three and nine months ended September 30, 2024, the Company recognized an Asset retirement obligation adjustment of $2.3 million and $6.3 million, respectively. The Company does not have mineral reserves, and accordingly, all related costs are expensed until mineral reserves are established. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||