EQUITY METHOD INVESTMENTS (Details) $ in Thousands, $ in Billions			1 Months Ended		12 Months Ended
	Oct. 24, 2024 USD ($)	Jul. 12, 2024 USD ($) shares	Oct. 31, 2023 USD ($) shares	Oct. 31, 2023 ARS ($) shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 25, 2024	Jul. 11, 2024	Oct. 10, 2023 USD ($)
EQUITY METHOD INVESTMENTS
Derecognition of cash on the date of deconsolidation					$ 45,700
Derecognition of investments on the date of deconsolidation					44,200
Derecognition of mineral property interests and plant and equipment on the date of deconsolidation					171,900
Derecognition of accounts payable and accrued liabilities on the date of deconsolidation					7,900
Deconsolidation of McEwen Copper					86,800
Deferred tax liability					36,630	$ 40,572
Gain on deconsolidation of McEwen Copper Inc. (Note 9)						222,157
Dilution gain from investments in McEwen Copper Inc.					5,777
Nuton LLC | McEwen Copper
EQUITY METHOD INVESTMENTS
Number of shares sold | shares			232,000	232,000
Aggregate purchase price			$ 6,000
McEwen Copper | Nuton LLC
EQUITY METHOD INVESTMENTS
Shares issued | shares			152,615	152,615
Proceeds from issuance of common stock			$ 4,000
McEwen Copper | FCA Argentina S.A
EQUITY METHOD INVESTMENTS
Shares issued | shares			1,900,000	1,900,000
Gross proceeds from private placement offering				$ 42
McEwen Copper Inc.
EQUITY METHOD INVESTMENTS
Initial carrying amount of the equity investment									$ 384,000
Deferred tax liability									$ 37,800
Private placement
EQUITY METHOD INVESTMENTS
Shares issued | shares		466,667
Proceeds from issuance of common stock		$ 14,000
McEwen Copper
EQUITY METHOD INVESTMENTS
Percentage of interest acquired									47.70%
Deconsolidation of McEwen Copper						383,968
Dilution gain from investments in McEwen Copper Inc.					$ 5,777
McEwen Copper
EQUITY METHOD INVESTMENTS
Deconsolidation of McEwen Copper						$ 86,820
Subsidiary ownership interest (as a percent)	48.30%	48.30%			46.40%		46.40%	47.70%
Dilution gain from investments in McEwen Copper Inc.					$ 5,800
McEwen Copper | Private placement
EQUITY METHOD INVESTMENTS
Shares issued | shares		166,667
Proceeds from issuance of common stock	$ 37,000	$ 5,000
McEwen Copper | Private placement | Nuton LLC
EQUITY METHOD INVESTMENTS
Proceeds from issuance of common stock	$ 35,000