EQUITY METHOD INVESTMENTS - Reconciliation of the Company's equity method investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Total equity method investments	$ 450,006	$ 428,641
Investment in McEwen Copper Inc.
Schedule of Equity Method Investments [Line Items]
Total equity method investments	272,115	274,189
Investment in Minera Santa Cruz S.A.
Schedule of Equity Method Investments [Line Items]
Total equity method investments	164,650	140,733
Investment in Paragon Advanced Labs Inc.
Schedule of Equity Method Investments [Line Items]
Total equity method investments	$ 13,241	$ 13,719

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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