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OPERATING SEGMENT REPORTING - Reportable Operating Segments (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
Operating Segment Reporting            
Revenue from gold and silver sales $ 59,234   $ 46,700   $ 133,283 $ 82,396
Depreciation and depletion (8,009)   (6,686)   (14,919) (12,707)
Gross profit 20,080   12,281   51,575 22,351
Exploration (11,400)   (5,392)   (16,859) (9,073)
Net income loss on investment in McEwen Copper $ 11,212   $ (3,382)   $ 41,550 $ (11,450)
Segment Reporting, Other Segment Item, Composition, Description Other segment items include   Other segment items include   Other segment items include Other segment items include
General and administrative $ (7,931)   $ (5,046)   $ (17,395) $ (8,415)
Depreciation (178)   (167)   (345) (317)
Other expenses (1,441)   7,050   (7,941) 8,627
Income (loss) before income and mining taxes $ 5,790   1,929   $ 38,995 (5,420)
Number Of Reportable Segments Not Disclosed Flag true       true  
Paragon Advanced Labs Inc.            
Operating Segment Reporting            
Revenue from gold and silver sales   $ 1,608   $ 1,920    
Other expenses   $ 452   $ 221    
Subsidiary (as a percent) 100.00%       100.00%  
Operating segment            
Operating Segment Reporting            
Revenue from gold and silver sales $ 59,234   46,700   $ 133,283 82,396
Production costs applicable to sales (31,145)   (27,733)   (66,789) (47,338)
Depreciation and depletion (8,009)   (6,686)   (14,919) (12,707)
Gross profit 20,080   12,281   51,575 22,351
Advanced projects (3,363)   (895)   (8,142) (2,579)
Exploration (11,400)   (5,392)   (16,859) (9,073)
Net income loss on investment in McEwen Copper 11,872   (3,382)   42,549 (11,450)
Other segment items (2,774)   (3,504)   (7,098) (5,200)
Segment profit (loss) 14,415   (892)   62,025 (5,951)
Dilution loss from investments in Paragon Advanced Labs Inc. (Note 9)         (1,170)  
General and administrative         (10,886) (6,408)
Depreciation         (237) (221)
Interest and other finance expenses, net         (1,972) (2,724)
Other expenses         (8,765) 9,884
Income (loss) before income and mining taxes         38,995 (5,420)
Capital expenditures 21,058   9,649   37,943 24,183
Corporate non segment            
Operating Segment Reporting            
Net income loss on investment in McEwen Copper (669)          
General and administrative (5,285)   (3,998)      
Depreciation (123)   (111)      
Interest and other finance expenses, net (383)   (1,414)      
Other expenses (2,165)   8,344      
Income (loss) before income and mining taxes $ 5,790   $ 1,929      
McEwen Copper and MSC reportable segments in aggregate            
Operating Segment Reporting            
Subsidiary (as a percent) 100.00%   100.00%      
Gold Bar Mine Complex | Operating segment            
Operating Segment Reporting            
Revenue from gold and silver sales $ 26,015   $ 27,523   63,732 49,913
Production costs applicable to sales (15,871)   (14,020)   (35,250) (23,113)
Depreciation and depletion (1,578)   (1,137)   (3,891) (2,315)
Gross profit 8,566   12,366   24,591 24,485
Exploration (6,507)   (2,529)   (9,648) (3,950)
Other segment items (1,591)   (418)   (3,726) (836)
Segment profit (loss) 468   9,419   11,217 19,699
Capital expenditures 3,294   870   5,369 9,133
Fox Complex | Operating segment            
Operating Segment Reporting            
Revenue from gold and silver sales 28,867   19,177   54,183 32,483
Production costs applicable to sales (14,232)   (13,713)   (28,943) (24,225)
Depreciation and depletion (6,431)   (5,549)   (11,028) (10,392)
Gross profit 8,204   (85)   14,212 (2,134)
Advanced projects (491)       (1,616)  
Exploration (2,570)   (2,863)   (3,955) (5,123)
Other segment items (1,066)   (1,406)   (3,092) (1,753)
Segment profit (loss) 4,077   (4,354)   5,549 (9,010)
Capital expenditures 17,595   8,758   32,306 15,012
Tartan Lake | Operating segment            
Operating Segment Reporting            
Exploration (2,323)       (3,256)  
Other segment items 34       (42)  
Segment profit (loss) (2,289)       (3,298)  
El Gallo | Operating segment            
Operating Segment Reporting            
Revenue from gold and silver sales 4,352       15,368  
Production costs applicable to sales (1,042)       (2,596)  
Gross profit 3,310       12,772  
Advanced projects (2,872)   (895)   (6,526) (2,579)
Other segment items (151)   (1,680)   (238) (2,611)
Segment profit (loss) 287   (2,575)   6,008 (5,190)
Capital expenditures 169   21   268 38
MSC | Operating segment            
Operating Segment Reporting            
Net income loss on investment in McEwen Copper 17,306   3,596   50,057 4,106
Segment profit (loss) 17,306   3,596   50,057 4,106
McEwen Copper | Operating segment            
Operating Segment Reporting            
Net income loss on investment in McEwen Copper (5,434)   (6,978)   (7,508) (15,556)
Segment profit (loss) $ (5,434)   $ (6,978)   $ (7,508) $ (15,556)