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RELATED PARTY TRANSACTIONS (Details) $ in Thousands										3 Months Ended
RELATED PARTY TRANSACTIONS (Details) $ in Thousands	Feb. 06, 2026 USD ($) shares	Jan. 07, 2026 USD ($) t	Jan. 05, 2026 USD ($) shares	Jul. 11, 2025 shares	May 06, 2025 shares	Apr. 28, 2025 shares	Mar. 27, 2025	Feb. 21, 2025 USD ($)	Jan. 31, 2025 USD ($) shares	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 15, 2025	Dec. 14, 2025	Dec. 09, 2025
Related Party Transactions
Accounts payable										$ 31,780		$ 214
Long-term debt										123,367		126,168
Due from McEwen Copper Inc. (Note 14)										$ 1,934		$ 3,169
Paragon Advanced Labs Inc.
Related Party Transactions
Percentage of interest acquired										27.00%			27.00%	27.30%	27.32%
Credit agreement
Related Party Transactions
Long-term debt									$ 40,000
Extension term for repayment of debt									24 months
Amount of principal of debt repaid								$ 20,000
Shares issued \| shares					53,160
Debt instrument, shares issued					2.00%
Debt interest expense										$ 500	$ 800
Stated interest rate (as a percent)										9.75%	9.75%
McEwen Copper
Related Party Transactions
Number of warrants issued \| shares	203,280
Outstanding warrants	$ 3,400
Robert R. McEwen
Related Party Transactions
Consideration fair value										$ 31,200
Adjustment of consideration										1,300
Purchase of ore inventory \| t		9,865
Accounts payable										31,177
Affiliate of Robert McEwen
Related Party Transactions
Ownership interest in Canadian Gold							32.50%
Affiliate of Robert McEwen \| Third amended loan agreement
Related Party Transactions
Long-term debt										40,000
Affiliate of Robert McEwen \| Credit agreement
Related Party Transactions
Long-term debt									$ 40,000
Extension term for repayment of debt									24 months
Amount of principal of debt repaid									$ 20,000
Shares issued \| shares									53,160
Debt instrument, shares issued									2.00%
Debt interest expense										$ 500	$ 800
Stated interest rate (as a percent)										9.75%
McEwen Copper
Related Party Transactions
Principal amount	13,600
Principal amount of previously advanced funds	6,100
New advances	$ 7,500
Loan receivable interest rate	12.00%
Interest income										$ 200	0
Effective interest rate										24.00%
Amount of contractual interest										$ 200
Amortization of loan origination fee										36
Total carrying value										12,300	0
Inventus Mining Corp.
Related Party Transactions
Payments to acquire ore inventory		$ 1,600
Accounts payable		$ 400								404
Number of warrants exercised \| shares				800,000		9,200,000
Number of warrants held \| shares						10,000,000
Andes Corporation Minera S.A
Related Party Transactions
Principal amount										$ 2,100
Loan receivable interest rate										12.00%
Interest income										$ 37	$ 0
Canadian Gold
Related Party Transactions
Common shares issued \| shares			2,943,766
Subscription rights issued \| shares			1,526,786
Canadian Gold \| Robert R. McEwen
Related Party Transactions
Common shares issued \| shares			3,208,481
Subscription rights issued \| shares			1,526,786
Shareholder approval not obtained subscription receipts in cash			$ 29,900