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ACQUISITIONS AND DIVESTITURES - Pro Forma (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Combination and Asset Acquisition [Abstract]    
Revenue $ 1,215,145 $ 1,077,093
Net income attributable to SSR Mining shareholders $ 264,390 $ 219,068