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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 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                
Net income (loss) $ 57,092 $ 80,362 $ 54,446 $ 6,251 $ 2,464 $ (358,162) $ 191,900 $ (349,447)
Net (income) loss attributable to non-controlling interest 8,349     4,306     22,397 82,615
Net income (loss) attributable to SSR Mining shareholders 65,441     10,557     214,297 (266,832)
Interest saving on 2019 Notes, net of tax 1,248     0     3,727 0
Net income (loss) used in the calculation of diluted net income per share $ 66,689     $ 10,557     $ 218,024 $ (266,832)
Weighted average number of common shares issued (in shares) 202,783     202,140     202,660 202,209
Adjustments for dilutive instruments, convertible notes (in shares) 13,011     0     12,981 0
Diluted weighted average number of shares outstanding (in shares) 217,464     202,447     217,018 202,209
Net income (loss) per share attributable to SSR Mining shareholders                
Basic (in dollars per share) $ 0.32     $ 0.05     $ 1.06 $ (1.32)
Diluted (in dollars per share) $ 0.31     $ 0.05     $ 1.00 $ (1.32)
Restricted share units                
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                
Adjustments for dilutive instruments (in shares) 1,670     307     1,377 0