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RECLAMATION AND REMEDIATION LIABILITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Asset Retirement Obligation [Line Items]
Reclamation and remediation costs	$ 69,850	$ 2,414		$ 74,170	$ 277,732
Incurred remediation costs			$ 272,900
Changes in estimates				62,927	11,054
Total reclamation costs
Asset Retirement Obligation [Line Items]
Reclamation and remediation costs	16,293	2,414		20,609	16,058
Reclamation adjustments and other	9,419	0		9,419	11,229
Changes in estimates				9,420	11,054
Total remediation costs
Asset Retirement Obligation [Line Items]
Reclamation and remediation costs	53,557	0		53,561	261,674
Reclamation adjustments and other	53,557	$ 0		53,561	261,674
Changes in estimates				53,507	$ 0
Çöpler Incident
Asset Retirement Obligation [Line Items]
Incurred remediation costs			22,500
Reclamation adjustments and other	62,900
Changes in estimates				12,900
Çöpler Incident | Total reclamation costs
Asset Retirement Obligation [Line Items]
Reclamation adjustments and other	$ 9,400
Changes in estimates				9,400
Çöpler Incident | Total remediation costs
Asset Retirement Obligation [Line Items]
Changes in estimates				$ 53,500
Çöpler Incident | Minimum
Asset Retirement Obligation [Line Items]
Reclamation and remediation costs			250,000
Çöpler Incident | Maximum
Asset Retirement Obligation [Line Items]
Reclamation and remediation costs			$ 300,000

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Amount of asset retirement obligations incurred during the period.

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

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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