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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
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Net income (loss) $ 29,004 $ 76,106
Net (income) loss attributable to non-controlling interest 809 (8,543)
Net income (loss) attributable to shareholders of SSR Mining 29,813 67,563
Interest saving on 2019 Notes, net of tax 1,221 1,215
Net income (loss) used in the calculation of diluted net income per share $ 31,034 $ 68,778
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Weighted average number of common shares outstanding (in shares) 206,778 212,423
Adjustments for dilutive instruments, 2019 Notes (in shares) 12,611 12,216
Diluted weighted average number of shares outstanding (in shares) 219,403 224,736
Net income (loss) per share attributable to common shareholders    
Basic (in dollars per share) $ 0.14 $ 0.32
Diluted (in dollars per share) $ 0.14 $ 0.31
Stock options    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Adjustments for dilutive instruments (in shares) 0 9
Restricted share units    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Adjustments for dilutive instruments (in shares) 14 88