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INCOME (LOSS) PER SHARE - Calculation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]            
Net income (loss) $ 122,376 $ 29,004 $ 67,519 $ 76,106 $ 151,380 $ 143,625
Net (income) loss attributable to non-controlling interest (47,510)   (9,031)   (46,701) (17,574)
Net income (loss) attributable to SSR Mining shareholders 74,866   58,488   104,679 126,051
Interest saving on 2019 Notes, net of tax 1,236   1,230   2,456 2,446
Net income (loss) used in the calculation of diluted net income per share $ 76,102   $ 59,718   $ 107,135 $ 128,497
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Weighted average number of common shares outstanding (in shares) 204,680   212,600   205,723 212,512
Adjustments for dilutive instruments, 2019 Notes (in shares) 12,624   12,367   12,611 12,353
Diluted weighted average number of shares outstanding (in shares) 217,320   225,084   218,347 224,962
Net income (loss) per share attributable to SSR Mining shareholders            
Basic (in dollars per share) $ 0.37   $ 0.28   $ 0.51 $ 0.59
Diluted (in dollars per share) $ 0.35   $ 0.27   $ 0.49 $ 0.57
Stock options            
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Adjustments for dilutive instruments (in shares) 0   7   0 6
Restricted share units            
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Adjustments for dilutive instruments (in shares) 16   110   13 91