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Asset Retirement Obligation
 3 Months Ended
Mar. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Asset Retirement Obligation
The following table summarizes changes in the Company’s Asset retirement obligation (“ARO”) (in thousands):
March 31, 2024December 31, 2023
Balance, beginning of period$7,973 $10,302 
Accretion 232 1,087 
Spending(139)(529)
Change in estimates1,991 (2,887)
Balance, end of period$10,057 $7,973 
Current$3,517 $3,172 
Non-Current$6,540 $4,801 
During the three months ended March 31, 2024, the Company recognized a change in estimate to reflect both a revised engineering design change required by the Nevada Department of Environmental Protection for impervious cover placement on the Crofoot Heap Leach Pad, and a change in timing to begin the work in 2025 and complete it by the end of 2027. In accordance with the change in estimate, the Company recorded an expense of $2.0 million as the Company does not have mineral reserves, and accordingly, all costs are expensed until such time that it declares mineral reserves.