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EQUITY METHOD INVESTMENTS - Summary of the operating results of McEwen Copper (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Equity Investments |  |  |  |
Advanced projects | $ (2,468) | $ (1,966) | $ (7,912) | $ (4,308)
Foreign currency gain (loss) | 62 | (23,705) | (333) | (58,818)
Interest and other income | (1,084) | 10,331 | (3,688) | 38,372
Loss before income and mining taxes | (1,267) | (28,617) | (39,578) | (110,873)
Net loss and comprehensive loss attributable to McEwen shareholders | (2,081) | (18,451) | (35,459) | (83,154)
Net loss on investment in McEwen Copper | (3,080) | $ (2,672) | $ (31,929) | $ (7,047)
McEwen Copper Inc. |  |  |  |
Equity Investments |  |  |  |
Subsidiary (as a percent) |  |  | 100.00% |
Advanced projects | (6,147) |  | $ (91,877) |
Other expenses | (678) |  | (4,529) |
Foreign currency gain (loss) | (308) |  | (3,990) |
Interest and other income | 3,295 |  | 23,590 |
Loss before income and mining taxes | (3,838) |  | (76,806) |
Net loss and comprehensive loss attributable to McEwen shareholders | $ (3,838) |  | $ (76,806) |
Subsidiary ownership interest (as a percent) | 48.30% |  | 48.30% |
Net loss on investment in McEwen Copper | $ (1,852) |  | $ (36,680) |

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