EQUITY METHOD INVESTMENTS (Details) $ / shares in Units, $ in Thousands, $ in Billions						1 Months Ended		12 Months Ended
	Dec. 15, 2025 USD ($) shares	Dec. 11, 2025 $ / shares shares	Dec. 09, 2025 USD ($) $ / shares shares	Oct. 24, 2024 USD ($)	Jul. 12, 2024 USD ($) shares	Oct. 31, 2023 USD ($) shares	Oct. 31, 2023 ARS ($) shares	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 14, 2025	Dec. 10, 2025	Oct. 25, 2024	Jul. 11, 2024	Oct. 10, 2023 USD ($)
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
Initial carrying amount of the equity investment								428,641	$ 400,801
Deferred tax liability								14,737	36,630
Gain on deconsolidation of McEwen Copper Inc. (Note 9)										$ 222,157
Dilution gain								789	5,777
Price per common share for each warrant | $ / shares		$ 35
Total assets								820,218	664,623
Current assets								107,886	41,192
Total liabilities								273,981	169,648
Current liabilities								63,809	47,693
Difference in proportionate share of net assets								$ 199,100
McEwen Copper Inc.
EQUITY METHOD INVESTMENTS
Initial carrying amount of the equity investment															$ 384,000
Private placement
EQUITY METHOD INVESTMENTS
Shares issued | shares					466,667
Proceeds from issuance of common stock					$ 14,000
Chairman and Chief Executive Officer
EQUITY METHOD INVESTMENTS
Number of warrants exercised | shares		100,000
McEwen Copper Inc.
EQUITY METHOD INVESTMENTS
Subsidiary ownership interest (as a percent)		46.30%		48.30%	48.30%			46.30%				46.40%	46.40%	47.70%	47.70%
Dilution gain								$ 789	5,777
Paragon Advanced Labs Inc.
EQUITY METHOD INVESTMENTS
Subsidiary ownership interest (as a percent)	27.00%		27.32%					27.00%			27.30%
Difference in proportionate share of net assets			$ 12,500
McEwen Copper Inc.
EQUITY METHOD INVESTMENTS
Deconsolidation of McEwen Copper										$ 86,820
Deferred tax liability															$ 37,800
Dilution gain								$ 800
Total assets								203,277	226,329
Current assets								7,089	34,067
Total liabilities								41,759	14,856
Current liabilities								$ 11,365	$ 14,656
McEwen Copper Inc. | Nuton LLC
EQUITY METHOD INVESTMENTS
Shares issued | shares						152,615	152,615
Proceeds from issuance of common stock						$ 4,000
Number of shares sold | shares						232,000	232,000
Aggregate purchase price						$ 6,000
McEwen Copper Inc. | 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. | Private placement
EQUITY METHOD INVESTMENTS
Shares issued | shares					166,667
Proceeds from issuance of common stock				$ 37,000	$ 5,000
McEwen Copper Inc. | Private placement | Nuton LLC
EQUITY METHOD INVESTMENTS
Proceeds from issuance of common stock				$ 35,000
Paragon Advanced Labs Inc.
EQUITY METHOD INVESTMENTS
Number of shares acquired | shares			8,742,880
Shares issued for acquisition of mineral property interests (in shares) | shares			709,992
Fair value of transaction			$ 13,700
Closing share price | $ / shares			$ 19.35
Net assets			$ 4,600
Total assets			36,900
Current assets			7,300
Total liabilities			32,300
Current liabilities			$ 9,900
Dilution loss	$ 200
Paragon Advanced Labs Inc. | Shareholder
EQUITY METHOD INVESTMENTS
Number of warrants exercised | shares	400,000