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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations Our obligations associated with the retirement of long-lived assets are recognized at fair value at the time the legal obligations are incurred. Upon initial recognition of a liability, a corresponding amount is capitalized as part of the carrying value of the related long-lived asset and is depreciated either by the straight-line method or the units-of-production method. The liability is accreted each period until the liability is settled, at which time the liability is removed. If the liability is settled for an amount other than the recorded amount, a gain or loss is recognized. Our asset retirement obligations are principally for costs to close our consolidated surface mines and reclaim the land as a result of our normal mining activities. Management’s estimate involves a high degree of subjectivity. In particular, the obligation’s fair value is determined using a discounted cash flow technique and is based upon mining permit requirements and various assumptions including credit adjusted risk-free-rates, estimates of disturbed acreage, life of the mine, estimated reclamation costs, the application of various environmental laws and regulations and assumptions regarding equipment productivity. We review our asset retirement obligations at each mine site at least annually and makes necessary adjustments for permit changes and for revisions of estimates of the timing and extent of reclamation activities and cost estimates. The accretion of the liability is being recognized over the estimated life of each individual asset retirement obligation and is recorded in the line Cost of sales in the accompanying Consolidated Statements of Operations. The associated asset is recorded in Property, Plant and Equipment, net in the accompanying Consolidated Balance Sheets. The depreciation of the asset is recorded in the line Cost of sales in the accompanying Consolidated Statements of Operations. A reconciliation of our beginning and ending aggregate carrying amount of the asset retirement obligations are as follows:
|  | Coal Mining |  |  |  | Unallocated Items |  | NACCO Consolidated
Balance at January 1, 2023 |  | $ | 28,460 |  |  |  |  | $ | 17,542 |  |  | $ | 46,002 |
Liabilities incurred during the period |  | 1,920 |  |  |  |  | — |  |  | 1,920 |
Liabilities settled during the period |  | (852) |  |  |  |  | (1,048) |  |  | (1,900) |
Accretion expense |  | 2,170 |  |  |  |  | 1,358 |  |  | 3,528 |
Revision of estimated cash flows |  | 1,346 |  |  |  |  | 1,717 |  |  | 3,063 |
Balance at December 31, 2023 |  | $ | 33,044 |  |  |  |  | $ | 19,569 |  |  | $ | 52,613 |
Liabilities settled during the period |  | (6,115) |  |  |  |  | (960) |  |  | (7,075) |
Accretion expense |  | 2,530 |  |  |  |  | 1,510 |  |  | 4,040 |
Revision of estimated cash flows |  | 79 |  |  |  |  | (130) |  |  | (51) |
Balance at December 31, 2024 |  | $ | 29,538 |  |  |  |  | $ | 19,989 |  |  | $ | 49,527 |
During 2023, we acquired 100% of the membership interests in the Marshall Mine. We received $2.2 million of cash, assumed the asset retirement obligation estimated to be approximately $1.9 million and recognized a gain of approximately $0.3 million in the line Other, net in the accompanying Consolidated Statements of Operations. The asset retirement obligation’s fair value was determined using a discounted cash flow technique and is based upon permit requirements and various estimates and assumptions that would be used by market participants, including estimates of disturbed acreage, reclamation costs and assumptions regarding equipment productivity. Bellaire's legacy liabilities include obligations for water treatment and other environmental remediation that arose as part of the normal course of closing these underground mining operations. Since Bellaire's properties are no longer active operations, no associated asset has been capitalized. Bellaire’s asset retirement obligation is included in the table above in the Unallocated Items column. Prior to 2023, Bellaire established a $5.0 million Mine Water Treatment Trust to provide a financial assurance mechanism in order to assure the long-term treatment of post-mining discharges. The fair value of Bellaire's Mine Water Treatment assets, which are recognized as a component of Equity securities on the Consolidated Balance Sheets, are $12.3 million and $11.2 million at December 31, 2024 and December 31, 2023, respectively, and are legally restricted for purposes of settling the Bellaire asset retirement obligation. See Note 9 for further discussion of the Mine Water Treatment Trust.

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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 -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-2 + Details
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