Mr. Rod Antal reports

SSR MINING ANNOUNCES EXPERT FINDINGS ON CAUSE OF THE COPLER INCIDENT

SSR Mining Inc. has provided an update on the Feb. 13, 2024, incident at Copler (the Copler incident).

Following the Copler incident, the company commissioned Call & Nicholas Inc. (CNI), an international mining consulting firm that specializes in geological engineering, geotechnical engineering and hydrology, to conduct an independent review of the heap leach failure at Copler. After analysis of the engineering design, construction and operation of the heap leach facility, and comprehensive reverse-engineering of the failure, CNI determined that the most likely cause of the Copler incident was a deeply rooted flaw in the third party engineered design of the heap leach pad.

The review found that in the third party engineered design, the assessment of the test data overestimated the shear strength properties of the liner system at the base of the heap leach, which inflated the calculated factor of safety values in the third party engineered design. This error resulted in insufficient shear strength along the liner interface to support the as-designed heap leach facility.

Importantly, CNI also determined that in all material respects, the heap leach pad construction and operation was carried out in conformance with the issued-for-construction engineered design parameters. In addition, CNI's review did not find any substantiation that excess water, ground vibrations from blasting, nor stacking beyond the design caused the event.

Rod Antal, executive chairman, said: "The independent expert review of the Copler incident has been an important body of work for the company to determine the cause of the Copler incident. Knowing now that the failure was the result of an engineering design flaw, and not the result of a failure in our operation or construction of the pad, provides clarity and some reassurance to the team on the ground as we seek to restart the Copler mine. We remain deeply saddened by the profound impact of this tragedy and we remain committed to Copler, the local communities and Turkey."

SSR Mining continues to work closely with the relevant authorities to advance the required permits for the restart of the Copler mine. At this time, the company is not able to estimate or predict when and under what conditions it will resume operations at Copler.

For additional information on the Copler incident, including a discussion of the associated risks, see the company's annual report on Form 10-K for the year ended Dec. 31, 2023, filed on Feb. 27, 2024, as well as the company's quarterly reports on Form 10-Q for the quarter ended March 31, 2024, filed on May 8, 2024, for the quarter ended June 30, 2024, filed on July 31, 2024, and for the quarter ended Sept. 30, 2024, filed on Nov. 6, 2024. Further updates on the Copler incident, as and when available, will continue to be provided through press releases and posts to the company's website.

About SSR Mining Inc.

SSR Mining is listed under the ticker symbol SSRM on the Nasdaq and the Toronto Stock Exchange, and SSR on the Australian Securities Exchange.

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