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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended			4 Months Ended	6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Revenues from External Customers and Long-Lived Assets
Non-current Assets	$ 827,319				$ 827,319		$ 680,689
Revenue	59,234		$ 46,700		133,283	$ 82,396
Paragon Advanced Labs Inc.
Revenues from External Customers and Long-Lived Assets
Revenue		$ 1,608		$ 1,920
Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Revenue	133,409		94,886		319,222	166,789
USA
Revenues from External Customers and Long-Lived Assets
Non-current Assets	141,123				141,123		114,644
Revenue	26,015		27,523		63,732	49,913
Canada
Revenues from External Customers and Long-Lived Assets
Non-current Assets	260,988				260,988		125,364
Revenue	28,867		$ 19,177		54,183	$ 32,483
Canada | Paragon Advanced Labs Inc.
Revenues from External Customers and Long-Lived Assets
Investment in Paragon, MSC or McEwen Copper	12,600				12,600		13,700
Mexico
Revenues from External Customers and Long-Lived Assets
Non-current Assets	26,017				26,017		25,759
Revenue	4,352				15,368
Argentina
Revenues from External Customers and Long-Lived Assets
Non-current Assets	399,191				399,191		414,922
Argentina | Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Investment in Paragon, MSC or McEwen Copper	132,500				132,500		140,700
Argentina | McEwen Copper Inc.
Revenues from External Customers and Long-Lived Assets
Investment in Paragon, MSC or McEwen Copper	$ 266,700				$ 266,700		$ 274,200

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