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OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating Segment Reporting    
Revenue from gold and silver sales $ 34,752,000 $ 25,542,000
Depreciation and depletion (6,896,000) (3,712,000)
Gross profit 4,443,000 (5,994,000)
Advanced projects - Other (1,680,000) (1,379,000)
Impairment loss on mineral property interests and plant and equipment (Note 8) 0  
Loss from investment in Minera Santa Cruz S.A. (3,461,000) (1,120,000)
Loss before income and mining taxes (36,946,000) (21,878,000)
United States Reportable Segment [Member]    
Operating Segment Reporting    
Revenue from gold and silver sales 11,587,000 11,742,000
Depreciation and depletion (1,260,000) (818,000)
Gross profit 986,000 (3,248,000)
Advanced projects - Other (289,000) (45,000)
Segment loss (76,000) (4,742,000)
Capital expenditures 2,991,000 277,000
Canada    
Operating Segment Reporting    
Revenue from gold and silver sales 23,165,000 12,896,000
Depreciation and depletion (5,636,000) (2,894,000)
Gross profit 3,457,000 1,355,000
Advanced projects - Other   (91,000)
Segment loss (1,283,000) (436,000)
Capital expenditures 2,773,000 3,546,000
Mexico Reportable Segment [Member]    
Operating Segment Reporting    
Revenue from gold and silver sales   904,000
Gross profit   (4,101,000)
Advanced projects - Other (1,391,000) (1,243,000)
Segment loss (1,391,000) (5,345,000)
MSC    
Operating Segment Reporting    
Loss from investment in Minera Santa Cruz S.A. (3,461,000) (1,120,000)
Segment loss (3,461,000) (1,120,000)
McEwen Copper    
Operating Segment Reporting    
Advanced projects - Other (31,880,000) (9,756,000)
Segment loss (32,267,000) (9,816,000)
Capital expenditures 954,000 234,000
Total Segment    
Operating Segment Reporting    
Revenue from gold and silver sales 34,752,000 25,542,000
Depreciation and depletion (6,896,000) (3,712,000)
Gross profit 4,443,000 (5,994,000)
Advanced projects - Other (33,560,000) (11,135,000)
Loss from investment in Minera Santa Cruz S.A. (3,461,000) (1,120,000)
Segment loss (38,478,000) (21,459,000)
General and Administrative and other 1,532,000 (419,000)
Loss before income and mining taxes (36,946,000) (21,878,000)
Capital expenditures 6,718,000 4,057,000
Gold and silver sales    
Operating Segment Reporting    
Revenue from gold and silver sales 34,752,000 25,542,000
Product [Member] | United States Reportable Segment [Member]    
Operating Segment Reporting    
Production costs applicable to sales (9,341,000) (14,172,000)
Product [Member] | Canada    
Operating Segment Reporting    
Production costs applicable to sales (14,072,000) (8,647,000)
Product [Member] | Mexico Reportable Segment [Member]    
Operating Segment Reporting    
Production costs applicable to sales   (5,005,000)
Product [Member] | Total Segment    
Operating Segment Reporting    
Production costs applicable to sales (23,413,000) (27,824,000)
Exploration | United States Reportable Segment [Member]    
Operating Segment Reporting    
Production costs applicable to sales (773,000) (1,449,000)
Exploration | Canada    
Operating Segment Reporting    
Production costs applicable to sales (4,740,000) (1,700,000)
Exploration | Mexico Reportable Segment [Member]    
Operating Segment Reporting    
Production costs applicable to sales   (1,000)
Exploration | McEwen Copper    
Operating Segment Reporting    
Production costs applicable to sales (387,000) (60,000)
Exploration | Total Segment    
Operating Segment Reporting    
Production costs applicable to sales $ (5,900,000) $ (3,210,000)