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INCOME (LOSS) PER SHARE - Calculation of Basic and Diluted Net Income (Los) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]                
Net income $ (28,372) $ 67,519 $ 76,106 $ 64,179 $ 77,792 $ 127,451 $ 115,251 $ 269,423
Net loss (income) attributable to non-controlling interest 2,579     (7,119)     (14,995) (28,782)
Net income (loss) attributable to shareholders of SSR Mining (25,793)     57,060     100,256 240,641
Interest saving on convertible notes, net of tax 0     1,226     3,677 3,662
Net income (loss) used in the calculation of diluted net income per share $ (25,793)     $ 58,286     $ 103,933 $ 244,303
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                
Weighted average number of common shares issued (in shares) 207,983     213,426     210,986 217,392
Adjustments for dilutive instruments, convertible notes (in shares) 0     12,177     12,493 12,152
Diluted weighted average number of shares outstanding (in shares) 207,983     225,689     223,543 229,652
Net income (loss) per share attributable to common shareholders                
Basic (in dollars per share) $ (0.12)     $ 0.27     $ 0.48 $ 1.11
Diluted (in dollars per share) $ (0.12)     $ 0.26     $ 0.46 $ 1.06
Stock options                
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                
Adjustments for dilutive instruments, share based compensation (in shares) 0     46     5 53
Restricted share units                
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                
Adjustments for dilutive instruments, share based compensation (in shares) 0     40     59 55