Sunshine Silver Mining & Refining to Begin Trading on NYSE

Rhea-AI Summary

Sunshine Silver Mining & Refining (NYSE:SSMR) begins trading on the NYSE, providing investors exposure to the Sunshine Mine, described as a high-grade, U.S.-based pure-play silver asset with vertically integrated refining potential.

The mine hosts 103.9M oz Indicated and 159.8M oz Inferred silver resources, with an average diluted silver grade of 1,022 g/t in Indicated resources. Sunshine targets a feasibility study by early 2027 and aims to restart silver production by late 2028, supported by $600M of existing infrastructure and $208M of prior investment.

AI-generated analysis. Not financial advice.

Positive

• NYSE listing under ticker SSMR increases access to public equity capital
• Sunshine Mine Indicated silver resources of 103.9 million ounces
• Sunshine Mine Inferred silver resources of 159.8 million ounces
• Average diluted Indicated silver grade of 1,022 g/t, about three times certain peers
• Planned silver output of 6.7M oz annually in first five production years
• Existing infrastructure estimated at $600 million plus $208 million prior investment
• Permitted mine-to-mill-to-refinery platform with potential on-site silver and antimony production
• Antimony plant concept could produce up to 34.5M lbs annually, up to 60% of U.S. demand

Negative

• Sunshine Mine is not yet in production; restart remains a future objective
• Feasibility study for Sunshine Mine only targeted for completion in early 2027
• Silver production is a goal for late 2028, implying a long lead time
• Antimony plant output and related U.S. demand share are described as potential, not committed

Key Figures

Average diluted silver grade: 1,022 grams per tonne Indicated silver resources: 103.9 million ounces Inferred silver resources: 159.8 million ounces +5 more

8 metrics

Average diluted silver grade 1,022 grams per tonne Indicated Mineral Resources at Sunshine Mine

Indicated silver resources 103.9 million ounces Silver Indicated Mineral Resources at Sunshine Mine

Inferred silver resources 159.8 million ounces Silver Inferred Mineral Resources at Sunshine Mine

Initial annual silver production 6.7 million ounces Expected annual production in first five years

Average silver production 5.8 million ounces Expected annual production over 24-year mine life

Potential antimony output 34.5 million pounds annually Potential finished antimony from Sunshine Antimony Plant

Existing infrastructure value $600 million Estimated value of existing Sunshine Mine infrastructure

Prior investments $208 million Investments over last 16 years in the asset

Market Reality Check

normal vol

Market Pulse Summary

This announcement highlights Sunshine Silver Mining & Refining’s transition to NYSE trading and outl...

Analysis

This announcement highlights Sunshine Silver Mining & Refining’s transition to NYSE trading and outlines a large-scale silver and antimony opportunity. The Sunshine Mine hosts 103.9 million ounces of Indicated and 159.8 million ounces of Inferred silver resources at an average grade of 1,022 grams per tonne. Management targets a feasibility study by early 2027 and potential production by late 2028. Key factors to watch include project execution, capital planning, and progress on the Sunshine Antimony Plant design.

Key Terms

indicated mineral resources, inferred mineral resources, critical minerals, feasibility study, +4 more

8 terms

indicated mineral resources technical

"average diluted silver grade of 1,022 grams per tonne in Indicated Mineral Resources"

Indicated mineral resources are quantities and qualities of a mineral deposit estimated with a reasonable level of confidence based on spaced sampling and analysis, sitting between a rough guess and a high-certainty measurement. For investors, they matter because they support preliminary economic studies and mine planning—think of them as a reasonably reliable shopping list for a recipe, useful for deciding whether to invest further but not yet proof that profitable extraction is guaranteed.

inferred mineral resources technical

"103.9 million ounces of silver Indicated Mineral Resources and 159.8 million ounces of silver Inferred Mineral Resources"

An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.

critical minerals regulatory

"both metals having been declared to be critical minerals by both the United States and China"

Materials needed to build modern technologies—like batteries, electronics, renewable energy systems and defense equipment—that have few easy substitutes and often come from a small number of countries or mines. Investors care because their supply can be disrupted, expensive or slow to increase, which affects the cost, availability and growth prospects of companies and industries that rely on them; think of them as critical spare parts for the global economy.

feasibility study technical

"engineering designs to support a Feasibility Study for the Sunshine Mine"

A feasibility study is an assessment that evaluates whether a proposed project or idea is practical and likely to succeed before investing significant time and resources. It considers factors like costs, potential benefits, and challenges, helping stakeholders decide if moving forward makes sense. Think of it as a detailed plan that gauges if a new venture is worth pursuing.

vertically integrated technical

"few vertically integrated, permitted mine-to-mill-to-refinery platforms in the U.S."

Vertically integrated describes a company that owns and controls multiple steps in making and selling its products or services — for example sourcing raw materials, manufacturing, and distribution. Like a bakery that grows its own wheat, mills the flour, bakes the bread and runs the shops, this setup can lower costs, improve quality and speed to market and protect profit margins, but it also requires more capital and can reduce flexibility.

comex financial

"produce 99.99 silver bars eligible for the COMEX as well as antimony metal"

COMEX is a major commodities exchange in the United States where traders buy and sell standardized contracts for metals like gold, silver and copper rather than the physical metal itself; those contracts set widely used benchmark prices. For investors, COMEX prices guide the valuation of miners, metal-backed funds and hedges, and act like a public price board—similar to a central marketplace where supply and demand reveal the going rate for a commodity.

new york stock exchange financial

"will begin trading today on the New York Stock Exchange ("NYSE")"

The New York Stock Exchange is a marketplace where people buy and sell shares of publicly traded companies. It functions like a busy trading hub, helping investors transfer ownership of company parts and providing a way to gauge how well businesses are doing. Its role is vital because it offers liquidity and transparency, making it easier for investors to buy and sell investments confidently.

antimony technical

"economic quantities of antimony, producing over 48.4 million pounds of finished antimony"

Antimony is a metallic element used as an ingredient in alloys, flame retardants, batteries and some electronic components; think of it as a small but critical hardware part that improves strength, safety and performance in manufactured goods. Investors care because changes in supply, mining output or industrial demand can shift its price and affect companies that mine, process or rely on it—similar to how a shortage of a car part can slow auto production and raise costs.

AI-generated analysis. Not financial advice.

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KELLOGG, Idaho, June 4, 2026 /PRNewswire/ -- Sunshine Silver Mining & Refining Company (the "Company" or "Sunshine") will begin trading today on the New York Stock Exchange ("NYSE") under the ticker symbol "SSMR."

Dr. Thomas S. Kaplan, Chairman, Sunshine Silver Mining & Refining Company: "Today marks the beginning of a new chapter for the iconic Sunshine Mine and the United States' silver production. Sunshine is a truly differentiated, superlative-rich asset, bringing together attributes that matter the most in this market: exceptional grade and scale, excellent exploration targets, a premier U.S. jurisdiction, substantial existing infrastructure, and a clear path toward restarting production. At a time when silver demand is rising across solar, electrification, electronics and advanced technologies, while primary silver supply remains constrained, Sunshine offers investors exposure to a scarce, U.S.-based pure-play silver asset with vertically integrated refining operations that have the potential to produce 99.99 silver bars eligible for the COMEX as well as antimony metal. With both metals having been declared to be critical minerals by both the United States and China, we believe this autonomy away from geopolitics to be a significant advantage."

Sunshine owns and controls the Sunshine Mine, one of the highest-grade pure-play silver resources in the world. The Sunshine Mine has an average diluted silver grade of 1,022 grams per tonne in Indicated Mineral Resources,¹ approximately three-times the grade of other high-grade silver assets globally.² It hosts 103.9 million ounces of silver Indicated Mineral Resources and 159.8 million ounces of silver Inferred Mineral Resources.³

Once in production, the Sunshine Mine is expected to produce approximately 6.7 million ounces of silver annually in its first five years of production with 5.8 million ounces over a 24-year mine life,³ which would make it the second largest primary silver mine in the U.S.⁴ It is also one of the few vertically integrated, permitted mine-to-mill-to-refinery platforms in the U.S., with potential on-site production of silver and antimony.

Sunshine has the potential to be a critical minerals hub. Historically, the Sunshine Mine contained economic quantities of antimony, producing over 48.4 million pounds of finished antimony between 1953 and 2001. The Company is currently evaluating the design and engineering for the already permitted Sunshine Antimony Plant, which, including Sunshine's own byproduct antimony production could potentially produce up to 34.5 million pounds of finished antimony annually⁵ – supplying up to 60% of U.S. demand for this critical mineral.⁶

Heather White, CEO, Sunshine Silver Mining and Refining Company: "With our having a clear path to the revitalization and restart of the Sunshine Mine, Sunshine's NYSE listing represents an important step as we move toward execution. Our near-term focus is on completing infill drilling and engineering designs to support a Feasibility Study for the Sunshine Mine, currently targeted for completion in early 2027. From there, we plan to begin mill construction and complete infrastructure upgrades, with the goal of delivering silver production in late 2028."

"Sunshine benefits from a significant head start. The Sunshine Mine has permits in-hand, substantial existing infrastructure estimated to be worth $600 million, and the multiple benefits of $208 million of investments made over the last 16 years to explore, maintain, and modernize the asset. This foundation is expected to reduce both timeline and execution risk as we work to bring the historic Sunshine Mine back into production."

About Sunshine Silver Mining & Refining Company

The Company is dedicated to bringing the historic, permitted Sunshine Mine back into production. As the largest mineral rights holder in Idaho's Coeur d'Alene Mining District – the most prolific silver district in U.S. history – Sunshine benefits from favorable mining regulations, an existing skilled labor force, mine suppliers and strong support for mining from the local population and government. The Sunshine Mine is one of the highest-grade primary silver resources in the world, and the Company is one of the few U.S.-based entities with a vertically integrated mine-to-mill-to-refinery platform, supported by a permitted onsite silver refinery and the major permits required for antimony production.

Citations

^[1,3] Mineral resource estimates are based on the Company's technical report summary for the Sunshine Mine, filed as an exhibit to the Company's Registration Statement on Form S-1. For additional information and a copy of the technical report, visit: https://sunshinesilvermining.com/sunshine-mine/.
^[2] Based on the median grades of the top fifteen highest grade silver assets globally, excluding Russia, of assets with contained Measured and Indicated Mineral Resources of at least 45 million ounces of silver and Inferred Mineral Resources of at least 5 million ounces of silver.
^[4] Based on the Silver Institute's "World Silver Survey 2025" report.
^[5] Assumes antimony facility runs at 100% capacity, producing 34.5 Mlbs antimony annually.
^[6] Estimated U.S. market demand as of 2030, as provided by the Argus Report.

Forward-Looking Statements

This press release contains forward-looking statements, including statements regarding the Company's business strategy, the Company's plans and objectives for future operations and industry trends. 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. Words such as "may," "might," "could," "would," "achieve," "budget," "scheduled," "forecasts," "should," "expects," "plans," "anticipates," "believes," "estimates," "predicts," "potential" or "continue" and similar expressions are used to identify these forward-looking statements. All forward-looking statements speak only as of the date on which they are made. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions concerning future events that are difficult to predict. Therefore, actual future events or results may differ materially from these statements. We caution you not to place undue reliance on these forward-looking statements.

 

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SOURCE Sunshine Silver Mining & Refining

FAQ

When does Sunshine Silver Mining & Refining (NYSE:SSMR) start trading on the NYSE?

Sunshine Silver Mining & Refining begins trading on the NYSE on June 4, 2026, under the ticker symbol SSMR. According to Sunshine, the listing marks a new chapter for the Sunshine Mine and offers investors exposure to a U.S.-based pure-play silver asset.

What silver resources support Sunshine Silver Mining (SSMR) and the Sunshine Mine?

The Sunshine Mine hosts 103.9M oz Indicated and 159.8M oz Inferred silver resources, with an average diluted Indicated grade of 1,022 g/t. According to Sunshine, this grade is approximately three times that of certain other high-grade silver assets globally.

What is the expected silver production profile for Sunshine Silver Mining (SSMR)?

Once in production, the Sunshine Mine is expected to produce about 6.7M oz of silver annually in its first five years and 5.8M oz over a 24-year mine life. According to Sunshine, this would make it the second-largest primary silver mine in the U.S.

What is Sunshine Silver Mining’s (SSMR) development timeline for the Sunshine Mine?

Sunshine targets completing a feasibility study by early 2027 and aims for initial silver production in late 2028. According to Sunshine, current work focuses on infill drilling, engineering designs, mill construction planning, and infrastructure upgrades to support the restart.

How could Sunshine Silver Mining’s (SSMR) antimony production impact U.S. supply?

The already permitted Sunshine Antimony Plant, including byproduct antimony, could potentially produce up to 34.5M lbs annually. According to Sunshine, this volume could supply up to 60% of U.S. demand for this designated critical mineral, if realized.

What existing infrastructure supports Sunshine Silver Mining’s (SSMR) restart plans?

The Sunshine Mine benefits from permits in hand, substantial existing infrastructure valued at about $600 million, and $208 million invested over 16 years. According to Sunshine, this foundation is expected to help reduce both timeline and execution risk for restarting production.

Why is Sunshine Silver Mining (SSMR) described as a vertically integrated silver asset?

Sunshine controls a permitted mine-to-mill-to-refinery platform with potential on-site silver and antimony production. According to Sunshine, its refining operations could produce 99.99 silver bars eligible for COMEX, offering investors exposure to a U.S.-based, vertically integrated silver and antimony hub.