NON-CONTROLLING INTERESTS (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Aug. 31, 2022	Jun. 21, 2022	Aug. 23, 2021	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Noncontrolling Interest
Issuance of equity by subsidiary (Note 18)				$ 26,850		$ 40,000		$ 41,350	$ 40,000
Net loss				(10,542)		(17,401)		(44,012)	(35,856)
Noncontrolling Interest
Noncontrolling Interest
Issuance of equity by subsidiary (Note 18)				16,114		$ 14,914	$ 7,600	23,707	$ 14,914	$ 14,900
Net loss				$ (12)				$ (300)
Additional Paid-in Capital
Noncontrolling Interest
Issuance of equity by subsidiary (Note 18)							$ 7,400			$ 25,100
McEwen Copper
Noncontrolling Interest
Percentage of ownership by company before private placement					81.40%		76.09%			100.00%
McEwen Copper | Minimum
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders										18.60%
McEwen Copper | Maximum
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders										81.40%
McEwen Copper | Noncontrolling Interest
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders				31.87%			23.91%	31.87%
McEwen Copper | Additional Paid-in Capital
Noncontrolling Interest
Issuance of equity by subsidiary (Note 18)				$ 10,800
Series B Private Placement Offering - Tranche One | McEwen Copper
Noncontrolling Interest
Sale of flow-through shares (in shares)			4,000,000
Share price			$ 10.00
Gross proceeds from private placement offering			$ 40,000
Percentage of ownership by noncontrolling shareholders										18.60%
Series B Private Placement Offering - Tranche One | McEwen Copper | Affiliate of Robert McEwen
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders			18.60%							18.60%
Series B Private Placement Offering - Tranche Two | McEwen Copper
Noncontrolling Interest
Sale of flow-through shares (in shares)		1,500,000
Share price		$ 10.00
Gross proceeds from private placement offering		$ 15,000
Series B Private Placement Offering - Tranche Two | McEwen Copper | Minimum
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders		5.31%
Series B Private Placement Offering - Tranche Two | McEwen Copper | Maximum
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders		76.09%
Series B Private Placement Offering - Tranche Two | McEwen Copper | Affiliate of Robert McEwen
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders				15.57%				15.57%
Series B Private Placement Offering - Third and final Tranche
Noncontrolling Interest
Gross proceeds from private placement offering	$ 26,900
Series B Private Placement Offering - Third and final Tranche | McEwen Copper
Noncontrolling Interest
Sale of flow-through shares (in shares)	2,685,000
Share price	$ 10.00
Series B Private Placement Offering - Third and final Tranche | McEwen Copper | Minimum
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders				7.96%				7.96%
Series B Private Placement Offering - Third and final Tranche | McEwen Copper | Maximum
Noncontrolling Interest
Percentage of ownership by noncontrolling shareholders				68.13%				68.13%