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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Unaudited supplementary quarterly information                      
Revenues                 $ 136,541 $ 104,789 $ 117,019
Gross profit (loss) $ (5,897) $ 344 $ 4,059 $ (4,986) $ (13,687) $ (701) $ (8,875) $ (3,685) (6,480) (26,948) 8,986
Net loss         $ (23,542) $ (9,778) $ (19,814) $ (99,191) (56,712) (152,325) (59,747)
Net loss attributable to McEwen shareholders $ (21,028) $ (17,401) $ (5,989) $ (12,466)         $ (56,884) $ (152,325) $ (59,747)
Net (loss) per share:                      
Basic and diluted (in dollars per share) $ (0.05) $ (0.04) $ (0.01) $ (0.03) $ (0.06) $ (0.02) $ (0.05) $ (0.25) $ (0.12) $ (0.38) $ (0.17)
Weighted average shares outstanding:                      
Basic and diluted (in shares) 454,899 459,187 459,187 441,794 408,959 403,887 400,513 400,370 454,899 403,457 361,845
Gold and silver sales                      
Unaudited supplementary quarterly information                      
Revenues $ 34,966 $ 37,129 $ 40,706 $ 23,740 $ 27,703 $ 27,395 $ 18,291 $ 31,400 $ 136,541 $ 104,789 $ 117,019