| Document and Entity Information | Feb. 23, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 23, 2022 |
| Entity Registrant Name | SSR Mining Inc. |
| Entity Incorporation, State or Country Code | A1 |
| Entity File Number | 001-35455 |
| Entity Tax Identification Number | 98-0211014 |
| Entity Address, Address Line One | Suite 800 |
| Entity Address, Address Line Two | 7001 E. Belleview Ave. |
| Entity Address, City or Town | Denver |
| Entity Address, State or Province | CO |
| Entity Address, Country | US |
| Entity Address, Postal Zip Code | 80237 |
| City Area Code | 303 |
| Local Phone Number | 292-1299 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares without par value |
| Trading Symbol | SSRM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000921638 |
| Amendment Flag | false |
