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INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net Income $ 425,922 $ 157,162 $ 101,218
Net (income) loss attributable to non-controlling interest (57,846) (5,627) 1,558
Net income attributable to stockholders of SSR Mining 368,076 151,535 102,776
Interest saving on convertible notes, net of tax 4,889 4,883 3,392
Net income used in the calculation of diluted net income per share $ 372,965 $ 156,418 $ 106,168
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average number of common shares issued (in shares) 215,993 151,144 121,769
Adjustments for dilutive instruments, convertible notes (in shares) 12,152 12,101 12,445
Diluted weighted average number of shares outstanding (in shares) 228,241 163,699 135,443
Net income per share attributable to SSR Mining shareholders      
Basic (in dollars per share) $ 1.70 $ 1.00 $ 0.84
Diluted (in dollars per share) $ 1.63 $ 0.96 $ 0.78
Stock options      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Adjustments for dilutive instruments (in shares) 38 453 1,224
PSUs and PSU Replacement Units      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Adjustments for dilutive instruments (in shares) 0 0 5
RSUs and RSU Replacement Units      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Adjustments for dilutive instruments (in shares) 58 1 0