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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH | 3 Months Ended
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Mar. 31, 2023
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:
| March 31, 2023 |  | December 31, 2022
Asset retirement obligations, beginning of period | $ | 9,595 |  |  | $ | 13,687 |
Revision of estimate | — |  |  | (238) |
Accretion of liabilities | 346 |  |  | 1,556 |
Held for sale(1) | (79) |  |  | (5,410) |
Asset retirement obligations, end of period | $ | 9,862 |  |  | $ | 9,595 |
(1)Asset retirement obligations held for sale as of December 31, 2022 are related to Alta Mesa and are included as asset retirement obligation and other liabilities held for sale on the Condensed Consolidated Balance Sheets. Asset retirement obligations held for sale as of March 31, 2023 are related to the accretion expense on Alta Mesa through the closing date and is included within Gain on sale of assets on the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss). See Note 5 – Property, Plant and Equipment and Mineral Properties 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. 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, Texas, 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, Alta Mesa 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 12 – Commitments and Contingencies for more information. The following table summarizes the Company’s restricted cash:
| March 31, 2023 |  | December 31, 2022
Restricted cash, beginning of period | $ | 17,449 |  |  | $ | 20,305 |
Additional collateral posted | 59 |  |  | 734 |
Held for sale(1) | — |  |  | (3,590) |
Restricted cash, end of period | $ | 17,508 |  |  | $ | 17,449 |
(1)Restricted cash held for sale is related to Alta Mesa and is included as Asset retirement obligation and other liabilities held for sale on the Condensed Consolidated Balance Sheets. As of March 31, 2023, $3.48 million has been released and reclassified from Asset retirement obligation and other liabilities held for sale to cash and cash equivalents on the Condensed Consolidated Balance Sheets. The remaining $0.11 million was reclassified Restricted cash on the Condensed Consolidated Balance Sheets. See Note 5 – Property, Plant and Equipment and Mineral Properties for more information.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=2175671 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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