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ACQUISITIONS AND DIVESTITURES - Acquisition of Hod Maden (Details)			6 Months Ended
		May 08, 2023 USD ($) goldEquivalentOunce	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses, gross	[1]		$ 0	$ 119,925,000
Contingent consideration			29,410,000		$ 29,648,000
Long-term debt			228,040,000		$ 228,436,000
Repayments of debt			920,000	35,336,000
Lydia Mines | Hod Maden
Business Acquisition [Line Items]
Ownership percentage by parent (as a percent)		70.00%
Horizon | Hod Maden
Business Acquisition [Line Items]
Ownership percentage by noncontrolling owners (as a percent)		30.00%
Hod Maden
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 120,000,000.0		$ 120,000,000
Business acquisition, option, percentage of voting interests acquired (as a percent)		30.00%
Transaction costs		$ 400,000
Hod Maden | Completion of Operational Milestones
Business Acquisition [Line Items]
Contingent consideration		30,000,000
Hod Maden | Delineation of New Reserves
Business Acquisition [Line Items]
Contingent consideration		$ 84,000,000
Business combination, contingent consideration, liability, additional mineral reserves required | goldEquivalentOunce		500,000
Hod Maden | Horizon | Unsecured Debt
Business Acquisition [Line Items]
Advances to affiliate			$ 3,500,000
Interest rate, stated (as a percent)			4.00%
Long-term debt			$ 10,100,000
Repayments of debt			$ 0
Lydia Mines | Hod Maden
Business Acquisition [Line Items]
Voting interest acquired (as a percent)		10.00%
[1] Acquisitions, net for the six months ended June 30, 2023 is comprised of $120.0 million cash paid in the acquisition of Hod Maden Project, net of cash and cash equivalents acquired.

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