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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unaudited supplementary quarterly information                      
Revenues $ 28,240 $ 25,988 $ 30,647 $ 25,542 $ 34,966 $ 37,129 $ 40,706 $ 23,740 $ 110,417 $ 136,541 $ 104,789
Gross profit (loss) (288) 1,503 4,235 (5,994) (5,897) 344 4,059 (4,986) (544) (6,480) (26,948)
Net loss $ (37,364) $ (9,976) $ (14,409) $ (19,327) $ (20,856) $ (17,401) $ (5,989) $ (12,466) (81,075) (56,712) (152,325)
Net loss attributable to McEwen shareholders                 $ (86,094) $ (56,884) $ (152,325)
Net (loss) per share:                      
Basic (in dollars per share) $ (0.79) $ (0.21) $ (0.30) $ (0.41) $ (0.46) $ (0.38) $ (0.13) $ (0.28) $ (1.71) $ (1.25) $ (3.78)
Diluted (in dollars per share) $ (0.79) $ (0.21) $ (0.30) $ (0.41) $ (0.46) $ (0.38) $ (0.13) $ (0.28) $ (1.71) $ (1.25) $ (3.78)
Weighted average shares outstanding:                      
Basic (in shares) 47,428 47,427 47,428 47,369 45,490 45,919 45,919 44,179 47,427 45,490 40,346
Diluted (in shares) 47,428 47,427 47,428 47,369 45,490 45,919 45,919 44,179 47,427 45,490 40,346
Minera Santa Cruz S.A.                      
Unaudited supplementary quarterly information                      
Revenues                 $ 254,698 $ 271,863 $ 219,020
Net loss                 12,863 269 5,602
Gold and silver sales                      
Unaudited supplementary quarterly information                      
Revenues                 $ 110,417 $ 136,541 $ 104,789