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EQUITY METHOD INVESTMENTS - Changes in Company's Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in the investment in MSC |  |  |
Investment, beginning of year | $ 326,147 |  |
Additional investment in McEwen Copper | 14,000 |  |
Dilution gain from investments in McEwen Copper Inc. | 5,777 |  |
Deconsolidation of McEwen Copper | 86,800 |  |
Income tax recovery | 3,048 | $ (33,859) | $ (5,806)
Investment, end of year | 298,947 | 326,147 |
McEwen Copper |  |  |
Change in the investment in MSC |  |  |
Investment, beginning of year | 326,147 |  |
Additional investment in McEwen Copper | 14,000 |  |
Dilution gain from investments in McEwen Copper Inc. | 5,777 |  |
Deconsolidation of McEwen Copper |  | 383,968 |
Attributable net income from MSC | (46,977) | (57,821) |
Investment, end of year | 298,947 | 326,147 |
Minera Santa Cruz S.A. |  |  |
Change in the investment in MSC |  |  |
Investment, beginning of year | 93,218 | 93,451 |
Attributable net income from MSC | 12,072 | 4,157 |
Amortization of fair value increments | (3,088) | (4,612) |
Income tax recovery | 37 | 517 |
Dividend distribution received | (385) | (295) |
Investment, end of year | $ 101,854 | $ 93,218 | $ 93,451

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