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INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Profit (loss), attributable to ordinary equity holders of parent entity    
Net income $ 140,468 $ 55,757 [1]
Net income attributable to NCI (6,974) 1,558
Equity holders of SSR Mining 133,494 57,315
Interest saving on convertible notes, net of tax 9,868 0
Net income used in the calculation of diluted net income per share $ 143,362 $ 57,315
Weighted average ordinary shares and adjusted weighted average ordinary shares    
Weighted average number of common shares issued (in shares) 151,144 121,769
Stock options (in shares) 752 892
Performance share units (in shares) 93 0
Restricted share units (in shares) 3 0
Convertible instruments (in shares) 12,445 0
Diluted weighted average number of shares outstanding (in shares) 164,437 122,661
Net income per share attributable to equity holders of SSR Mining    
Basic (usd per share) $ 0.88 $ 0.47
Diluted (usd per share) $ 0.87 $ 0.47
[1] See note 2(r)