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RECLAMATION AND REMEDIATION LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Reclamation and Remediation Liabilities | Changes in Reclamation and remediation liabilities during the nine months ended September 30, 2025 and 2024, were as follows (in thousands):
| Nine Months Ended September 30, 2025 |  | Nine Months Ended September 30, 2024
| Reclamation |  | Remediation |  | Total |  | Reclamation |  | Remediation |  | Total
Balance as of January 1 | $ | 209,923 |  |  | $ | 135,914 |  |  | $ | 345,837 |  |  | $ | 173,819 |  |  | $ | — |  |  | $ | 173,819 |
Additions (1) |  | 220,974 |  |  |  | — |  |  |  | 220,974 |  |  |  | — |  |  |  | 261,674 |  |  |  | 261,674 |
Changes in estimate and other (2) |  | 11,856 |  |  |  | 53,507 |  |  |  | 65,363 |  |  |  | 11,054 |  |  |  | — |  |  |  | 11,054 |
Expenditures |  | (4,259) |  |  |  | (13,032) |  |  |  | (17,291) |  |  |  | (1,913) |  |  |  | (125,306) |  |  |  | (127,219) |
Accretion expense |  | 18,249 |  |  |  | — |  |  |  | 18,249 |  |  |  | 7,243 |  |  |  | — |  |  |  | 7,243 |
Balance as of September 30 | $ | 456,743 |  |  | $ | 176,389 |  |  | $ | 633,132 |  |  | $ | 190,203 |  |  | $ | 136,368 |  |  | $ | 326,571 |
Less: current portion |  | (13,228) |  |  |  | (15,079) |  |  |  | (28,307) |  |  |  | (11,765) |  |  |  | (82,345) |  |  |  | (94,110) |
Non-current reclamation and remediation liabilities | $ | 443,515 |  |  | $ | 161,310 |  |  | $ | 604,825 |  |  | $ | 178,438 |  |  | $ | 54,023 |  |  | $ | 232,461 |
(1)During the nine months ended September 30, 2025, reclamation changes were primarily comprised of an increase of $221.0 million as a result of the acquisition of CC&V. During the nine months ended September 30, 2024, the Company recorded a remediation liability of $261.7 million as a result of the Çöpler Incident. The remediation activities include movement of the displaced heap leach material out of the Sabırlı Valley and Manganese pit, sloping and stabilization of the heap leach pad in preparation for permanent closure, construction of a permanent storage facility for the displaced heap leach material, and management of surface and ground water in the Sabırlı Valley. (2)During the nine months ended September 30, 2025, reclamation and remediation at Çöpler increased $9.4 million and $53.5 million, respectively, due to the revised estimate related to the closure of the Çöpler heap leach pad and construction estimate for the permanent storage facility during the second quarter of 2025. At Marigold, reclamation increased by $2.5 million during the nine months ended September 30, 2025, primarily due to additional disturbance and an increase in labor unit cost rates. During the nine months ended September 30, 2024, reclamation changes were comprised of an $11.1 million revision in the timing primarily related to the closure of the heap leach pad as a result of the Çöpler Incident. The following table includes the components of Reclamation and remediation costs for the three and nine months ended September 30, 2025 and 2024 (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024
Reclamation adjustments and other |  | $ | — |  |  | $ | — |  |  | $ | 9,419 |  |  | $ | 11,229 |
Reclamation accretion |  |  | 7,059 |  |  |  | 2,414 |  |  |  | 18,249 |  |  |  | 7,243 |
Total reclamation costs |  |  | 7,059 |  |  |  | 2,414 |  |  |  | 27,668 |  |  |  | 18,472 |
Remediation adjustments and other |  |  | 76 |  |  |  | — |  |  |  | 53,637 |  |  |  | 261,674 |
Total remediation costs |  |  | 76 |  |  |  | — |  |  |  | 53,637 |  |  |  | 261,674 |
Total reclamation and remediation costs |  | $ | 7,135 |  |  | $ | 2,414 |  |  | $ | 81,305 |  |  | $ | 280,146 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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