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EQUITY METHOD INVESTMENTS - Changes in Company's Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Change in the investment in MSC |  |  |  |  |
Investment, beginning of year |  |  | $ 326,147 |  |
Additional investment in McEwen Copper |  |  | 14,000 |  |
Income tax recovery | $ (814) | $ 244 | 4,119 | $ 2,829 |
Investment, end of year | 303,467 |  | 303,467 |  | $ 326,147
McEwen Copper |  |  |  |  |
Change in the investment in MSC |  |  |  |  |
Investment, beginning of year |  |  | 326,147 |  |
Additional investment in McEwen Copper |  |  | 14,000 |  |
Deconsolidation of McEwen Copper |  |  |  |  | 383,968
Attributable net loss from McEwen Copper |  |  | (36,680) |  | (57,821)
Investment, end of year | 303,467 |  | 303,467 |  | 326,147
Minera Santa Cruz S.A. |  |  |  |  |
Change in the investment in MSC |  |  |  |  |
Investment, beginning of year |  |  | 93,218 | $ 93,451 | 93,451
Attributable net loss from McEwen Copper |  |  | 6,271 |  | 4,157
Amortization of fair value increments |  |  | (2,209) |  | (4,612)
Income tax recovery |  |  | 689 |  | 517
Dividend distribution received |  |  | (383) |  | (295)
Investment, end of year | $ 97,586 |  | $ 97,586 |  | $ 93,218

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