Sunshine Silver Mining & Refining Company press release

Sunshine Silver Mining & Refining Announces Inclusion in Solactive Global Silver Miners Index

2026-11-02

NYSE - New York Stock Exchange · Awards & Recognition

PR Newswire

KELLOGG, Idaho, Nov. 2, 2026/PRNewswire/ -- Sunshine Silver Mining & Refining Company (NYSE:SSMR) (the "Company" or "Sunshine"), a mining company advancing the next chapter of American silver, today announced that its common stock will be added to the Solactive Global Silver Miners Index ("Silver Index") effective at market open on November 2, 2026.

The addition follows Sunshine's debut on the New York Stock Exchange on June 4, 2026, and places the Company in a global benchmark of leading businesses active in the silver sector.

"Sunshine's inclusion in the Solactive Global Silver Miners Index reflects the strong foundation we've built as a silver developer advancing toward production," said Heather White, CEO of Sunshine Silver Mining & Refining. "More than 90% of expected revenue at planned production is projected to come from silver, giving investors significant leverage to silver prices as we work toward our targeted return to production in late 2028."1

The Silver Index represents companies involved in silver mining and related activities, including silver exploration and refining. Under Solactive's methodology, the index generally includes 20 to 40 companies selected based on average daily trading volume and weighted by free-float market capitalization. Sunshine's inclusion is expected to broaden the Company's visibility among institutional investors and funds that use the index as a benchmark.

For more information on the Solactive Global Silver Miners Index, please visit: https://www.solactive.com/index/DE000A1DKEB9/.

About Sunshine Silver Mining & Refining Company

Sunshine Silver Mining & Refining Company is advancing toward silver production from the Sunshine Mine in Idaho's Silver Valley, the most prolific silver district in U.S. history. The Sunshine Mine is North America's highest-grade primary silver resource. It is characterized by exceptional size, extraordinary growth potential, existing infrastructure, and a history of proven production. Sunshine, the largest holder of mineral rights in the Silver Valley, also controls a consolidated land position with significant exploration potential and is evaluating additional value opportunities through silver/copper refining and antimony production. For more information, visit www.sunshinesilvermining.com.

Cautionary Statements

This press release contains forward-looking statements, including statements regarding the Company's planned return to production in late 2028 and the expected benefits of Sunshine's inclusion in the Solactive Global Silver Miners Index. In some cases, forward-looking statements can be identified by words such as "anticipate," "believe," "continue," "estimate," "expect," "intend," "may," "will," "could," "predict" and similar expressions or terminology. These statements are not historical facts but rather are based on the Company's current expectations and projections regarding its business, operations and other factors relating thereto and are subject to a number of known and unknown risks, uncertainties and other factors, including the risk factors set forth in our registration statement on Form S-1 filed with the Securities and Exchange Commission ("SEC") and other filings that we make from time to time with the SEC, that may cause the actual results, levels of activity, performance or achievements of the Company to be materially different from those expressed or implied by any forward-looking statements. Except to the extent required by law, the Company assumes no obligation to update any of these forward-looking statements or to conform these statements to actual results or revised expectations. We caution you not to place undue reliance on these forward-looking statements.

| _ 1Projected silver revenue is based on the life of mine silver production per the "Base Case" as defined in the Company's S-K 1300 Technical Report Summary on the Initial Assessment, Sunshine Mine, Idaho, USA, dated March 25, 2026 ("IA"). By-product revenues assume by-product production matches historical ratios implied by the last five full years of production (1996 - 2000) at the Sunshine Mine, silver price of $67.06/oz, copper price of $6.79/lb, and lead price of $0.86/lb (sourced from Capital IQ Pro), and average projected U.S. finished antimony price between 2029 - 2040 of $24.26/lb under the base case of the Argus Report (as prepared by Argus Media in December 2025 for the Company). By-product revenues adjusted for (i) a 7% NSR across all metals, (ii) assumed recovery rates of 97% for copper, lead and for antimony, and (iii) assumed payability rates of 96.5% for copper and 95% for lead, per Fastmarkets, and 70% for antimony based on comparable assets. |

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SOURCE Sunshine Silver Mining & Refining