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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations and Restricted Cash ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH
Asset Retirement Obligations
The following table summarizes the Company’s asset retirement obligations:
December 31,
 20242023
Asset retirement obligations, beginning of period$10,922 $9,595 
Revision of estimate165 214 
Accretion of liabilities2,068 1,192 
Additions(1)
34,168 — 
Settlements(3,206)— 
Disposal of Alta Mesa asset retirement obligations(2)
— (79)
Asset retirement obligations, end of period$44,117 $10,922 
(1)    ARO assumed from Base Resources upon acquisition. See Note – 3 Transactions for more information.
(2)    Disposal of Alta Mesa asset retirement obligations is related to the accretion expense incurred on these obligations through the closing date and is included within Gain on sale of assets on the Consolidated Statements of Operations and Comprehensive Income (Loss). See Note 7 – Mineral Properties and Property, Plant and Equipment for more information.

The Company’s asset retirement obligations are subject to legal and regulatory requirements. Estimates of the costs of reclamation are reviewed periodically by the Company and the applicable regulatory authorities. The above provision represents the Company’s estimate of the present value of future reclamation costs, discounted using credit adjusted risk-free interest rates ranging from 11.62% to 13.76% and inflation rates ranging from 2.25% to 4.10% for the year ended December 31, 2024. For the year ended December 31, 2023, the interest rates ranged from 11.62% to 12.88% and inflation rates ranged from 2.25% to 3.97%. The total undiscounted decommissioning liability as of December 31, 2024 and 2023 is $74.27 million and $33.38 million, respectively.
Restricted Cash
The Company has cash, cash equivalents and fixed income securities as collateral for various bonds posted in favor of the applicable state regulatory agencies in Arizona, Colorado, New Mexico, Utah and Wyoming, and the U.S. Bureau of Land Management and U.S. Forest Service for estimated reclamation costs associated with the White Mesa Mill, Nichols Ranch and other mining properties. The restricted cash will be released when the Company has reclaimed a mineral property, sold a mineral property to a party having assumed the applicable bond requirements, or restructured the surety and collateral arrangements. See Note 15 – Commitments and Contingencies for more information.
The following table summarizes the Company’s restricted cash:
December 31,
 20242023
Restricted cash, beginning of period$17,579 $17,449 
Additional collateral posted1,896 130 
Restricted cash acquired527 — 
Restricted cash, end of period$20,002 $17,579