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Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2025
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Contingencies Reserve Balance | For the quarter and six months ended June 30, 2025 the following undiscounted activity was recorded in connection with the New Idria Mercury Mine:
|  | For the Quarter Ended June 30, |  |  | For the Six Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Beginning reserve balance |  | $ | 11,719 |  |  | $ | 12,315 |  |  | $ | 12,425 |  |  | $ | 13,182 |
Changes in estimated environmental liability |  |  | — |  |  |  | 800 |  |  |  | — |  |  |  | 800 |
Payments made |  |  | (478 | ) |  |  | (623 | ) |  |  | (1,184 | ) |  |  | (1,490 | )
Ending reserve balance (1) |  | $ | 11,241 |  |  | $ | 12,492 |  |  | $ | 11,241 |  |  | $ | 12,492 |
Beginning receivable balance |  | $ | 7,487 |  |  | $ | 7,020 |  |  | $ | 8,404 |  |  | $ | 7,245 |
Changes in estimated insurance recovery |  |  | — |  |  |  | 700 |  |  |  | — |  |  |  | 1,000 |
Insurance recovery reimbursements |  |  | (437 | ) |  |  | (606 | ) |  |  | (1,354 | ) |  |  | (1,131 | )
Ending receivable balance (2) |  | $ | 7,050 |  |  | $ | 7,114 |  |  | $ | 7,050 |  |  | $ | 7,114 |
(1) As of June 30, 2025, Buckhorn has a total ending reserve balance of $11.2 million related to the New Idria Mine, of which $6.4 million is classified in Other current liabilities and $4.8 million in Other liabilities (long-term). (2) As of June 30, 2025, Buckhorn has a total receivable balance related to the probable insurance recovery of $7.0 million, of which $2.8 million is classified in Other a ccounts receivable and $4.2 million is classified in Other assets (long-term).

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