United States Antimony Corporation Announces Today "Wet Commissioning" of Its Radersburg Flotation Mill

Rhea-AI Summary

United States Antimony (NYSE American:UAMY) announced wet commissioning of its Radersburg, Montana flotation mill, following a $4.75 million acquisition and about $2 million in upgrades and a new lab. The site will process ~800 tons of antimony ore from Stibnite Hill and strengthen USAC’s fully integrated U.S. antimony supply chain, supporting its $245 million Department of War MIL-SPEC contract and future Hydromet refinery plans.

Positive

• Radersburg flotation mill acquired for $4.75 million and now wet commissioned
• Approximately $2 million invested in equipment upgrades, refurbishments, and new laboratory
• New laboratory built for about $1 million with advanced XRF, fire assay, wet chemistry
• Initial ~800 tons of antimony ore ready for processing from Stibnite Hill mine
• Fully owned, permitted midstream facility removes reliance on third-party mills
• Supports fulfillment of $245 million sole-source Department of War MIL-SPEC contract
• Hydromet refinery concept estimated at $44 million build cost, with $35.2 million requested from DOE

Negative

• Hydromet refinery project would require an estimated $44 million in capital investment
• Flotation-based operations currently depend on strict specification-compliant feedstock quality

Market reaction after Radersburg mill commissioning: UAMY -6.34% in the Jul 7 session

-6.34%

19 alerts

-6.34% Session close to close

-7.8% Trough in 25 hr 54 min

$1.10B Market Cap

0.3x Rel. Volume

In the Jul 7 session, UAMY declined 6.34%, reflecting a notable negative market reaction. Argus tracked a trough of -7.8% from its starting point during tracking. Our momentum scanner triggered 19 alerts that day, indicating notable trading interest and price volatility.

Data tracked by StockTitan Argus on the day of publication.

Market Context

The stock moved -6.3% in the session following this news. A sharp decline would contrast with the st...

Analysis

The stock moved -6.3% in the session following this news. A sharp decline would contrast with the strategic aim of the Radersburg mill and proposed $44 million Hydromet refinery, echoing prior selloffs after heavy-spend updates. With short interest elevated, covering or new shorts could further accentuate volatility.

Key Figures

Radersburg mill acquisition: $4.75 million Capital expenditures: ~$2 million Laboratory build cost: ~$1 million +5 more

8 metrics

Radersburg mill acquisition $4.75 million Facility purchase in January 2026

Capital expenditures ~$2 million Equipment upgrades, refurbishments, new lab at Radersburg

Laboratory build cost ~$1 million New Radersburg lab with full analytical capabilities

Initial ore for processing ~800 tons Antimony ore mined from Stibnite Hill in fall prior to commissioning

Antimony ore grade spec ≥10% Sb Required feedstock grade for Stage 1 mining operations

Concentrate grade ~60% Sb Target output from Radersburg flotation concentration

Hydromet refinery build cost $44 million Estimated cost for proposed Hydromet refinery project

DOE funding requested $35.2 million U.S. government funds requested for Hydromet refinery

Historical Context

5 past events · Latest: Jul 01 (Positive)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Jul 01	Contract shipment update	Positive	+6.1%	First antimony shipments and invoices under $245M Defense Logistics contract.
Jun 09	Smelter status update	Positive	-7.5%	Commissioning new Thompson Falls smelter funded by $27M Department of War award.
May 14	1Q26 earnings report	Negative	-10.0%	Reported $6.8M revenue with $11.3M net loss and reiterated $125M revenue guidance.
May 06	Leadership change	Neutral	+13.1%	Appointed interim CFO while existing CFO took temporary personal leave.
May 05	Earnings call scheduling	Neutral	+13.1%	Announced timing and webcast details for upcoming Q1 2026 results release.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

Recent news has produced mixed reactions, with both strong rallies and selloffs following operational and earnings updates.

Key Terms

wet commissioning, flotation mill, xrf, hydrometallurgical, +2 more

6 terms

wet commissioning technical

"is pleased to announce today the wet commissioning of its critical mineral flotation mill"

The process of filling, circulating and testing equipment and systems that handle liquids—such as boilers, turbines, piping, pumps, or offshore production facilities—so they operate correctly under real, fluid-filled conditions. For investors, wet commissioning signals a project moving from construction toward full operation, reducing technical and schedule risk and clarifying the timeline for when the asset can begin generating revenue; think of it as a supervised, real-world shakedown drive with fuel and passengers.

flotation mill technical

"the wet commissioning of its critical mineral flotation mill located in Radersburg, Montana"

An industrial facility that uses froth flotation to separate and concentrate valuable minerals from mined ore, like skimming oil from water to pull out the parts you want. It includes tanks, grinders, pumps and other equipment that crush ore, mix it with chemicals and air, and collect mineral-rich froth. Investors care because a flotation mill determines how much saleable product a mine can produce, how efficiently it recovers value, and the operating and capital costs tied to production timing and cash flow.

xrf technical

"features full sample preparation, a 3-kilowatt XRF, fire assay, and wet chemistry"

X-ray fluorescence (XRF) is a non-destructive lab technique that uses X-rays to identify and measure the elements in a material, like reading the elemental 'fingerprint' of a rock, metal part, or product. Investors care because XRF helps confirm the quality, composition and value of raw materials, ores or manufactured goods quickly and cheaply, which can affect mining grades, production costs, regulatory compliance and the valuation of companies tied to those materials.

hydrometallurgical technical

"Hydrometallurgical ("Hydromet") Refinery with Critical Materials Byproduct Recovery project"

Hydrometallurgical describes methods that use water-based chemistry to dissolve, separate and recover metals from ores, concentrates or recycled materials, much like dissolving sugar to separate it from tea and then collecting the sugar back out. It matters to investors because these processes determine how much metal a project can realistically produce, the operating cost and environmental footprint, and therefore influence revenue potential, capital needs and regulatory risk.

pyrometallurgical smelting technical

"cannot meet the tight specifications required for pyrometallurgical smelting"

A high‑heat industrial process that melts ore or metal-containing material to separate and recover metals using chemical reactions and fluxes; it is a subset of metallurgical refining that relies on temperature rather than electrochemistry. Investors care because smelting determines production costs, energy use, emissions and regulatory exposure—factors that affect profit margins, capital needs and the reliable supply of refined metal, similar to how a factory’s furnace efficiency shapes its product cost and environmental footprint.

mil-spec regulatory

"sole-source Department of War contract for Military Specification ("MIL-SPEC") antimony metal"

A mil-spec is a military specification that sets strict technical and quality standards for products or components used by armed forces, like a blueprint for durability and performance under harsh conditions. For investors, a mil-spec label signals that a product meets government procurement requirements, which can open stable contract opportunities, imply higher production costs and margins, and create barriers to competitors — all of which affect a company’s revenue and risk profile.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Montana Governor Greg Gianforte Attending the Celebration Today

"The Critical Minerals and ZEO Company"

~ Antimony, Cobalt, Gold, Tungsten, and Zeolite ~

DALLAS, TX / ACCESS Newswire / July 7, 2026 / United States Antimony Corporation ("USAC," "U.S. Antimony," or the "Company"), (NYSE American:UAMY)(NYSE Texas:UAMY), a leading producer and processor of antimony, zeolite, and other critical minerals, and the only fully integrated antimony company in the world outside of China and Russia, is pleased to announce today the wet commissioning of its critical mineral flotation mill located in Radersburg, Montana.

The Company will celebrate this significant milestone with a Rock Breaking and Ribbon Cutting Ceremony today, July 7, 2026, from 11:00 a.m. to 2:00 p.m. MST at 161 Keating Gulch Road, Radersburg, Montana, with the Governor of Montana in attendance. Following the $4.75 million acquisition of this facility in January of this year and the subsequent ~$2 million capital expenditures for specific equipment upgrades, refurbishments, and a new laboratory, the facility is now ready to come online and process the initial ~800 tons of antimony ore mined last fall from the Company's Stibnite Hill operations in Thompson Falls, Montana.

The Radersburg Flotation Mill will start production once the laboratory is fully commissioned to allow for process and product control. The ~$1 million cost to build a new laboratory features full sample preparation, a 3-kilowatt XRF, fire assay, and wet chemistry capabilities with all newly acquired equipment. Full commissioning of the laboratory and subsequent concentrate production from the mill is planned for some time in mid-July. The Stibnite Hill mine is currently producing raw antimony ore for future processing. This midstream asset is a cornerstone in USAC's fully vertical integration strategy, enabling the Company to upgrade antimony-bearing material from its Montana and Alaska mining operations into high-grade concentrate suitable for downstream smelting allowing antimony metal, trioxide, and trisulfide production. This additional throughput will enhance USAC's ability to fulfill its $245 million, sole-source Department of War contract for Military Specification ("MIL-SPEC") antimony metal, as well as its commercial obligations for fire retardants and other products, at an accelerated pace.

USAC'S INTEGRATED OPERATIONS

USAC's operating business consists of three critical stages:

• Stage 1 - Mining: Extraction of raw antimony ore (primarily stibnite) meeting strict specifications of ≥10% Sb with minimal impurities.

• Stage 2 - Concentration via Flotation (Radersburg): Midstream beneficiation that produces a high-grade ~60% Sb concentrate through gravity and flotation circuits. This step is essential but requires specification-compliant feedstock before going to the third phase, smeltering operations.

• Stage 3 - Smelting (Thompson Falls and Mexico): Oxidation and reduction smelting that removes remaining impurities to produce finished high-purity antimony products (metal, trioxide, trisulfide, etc.).

The Radersburg flotation facility was USAC's missing piece in its fully integrated, 100% Company-owned portfolio of production equipment and facilities as its previous flotation facility was under lease from a third-party. It now provides the Company with an in-house, fully permitted, and operational midstream concentration facility located within the State of Montana, which dramatically strengthens control over our supply chain and completely eliminating reliance on third-party mills, which are unreliable, expensive, and out of date.

Current Process Limitations and the Path Forward with Hydromet

China's export restrictions beginning in September 2024 triggered a historic supply shock and price surge that reached over 500%, making it economical for artisanal and small-scale miners worldwide to ramp up production. However, the overwhelming majority of this new global supply does not and cannot meet the tight specifications required for pyrometallurgical smelting. Flotation processes can be used to produce concentrates with these stringent specifications, if the inherent mineralogy is conducive, by rejecting minerals that carry diluents such as arsenic, lead, and iron. Some refractory ores do not yield to this level of separation. To overcome these limitations and unlock far greater volumes of domestic and international feedstock, USAC has submitted a direct application in January 2026 to the U.S. Department of Energy (DOE) in support of an estimated $44 million build cost Hydrometallurgical ("Hydromet") Refinery with Critical Materials Byproduct Recovery project at the already-permitted Radersburg site ($35.2 million requested in U.S. government funds). This next-generation Hydromet platform would accept a much wider range of antimony-bearing materials, deliver cleaner processing with higher recovery rates, enable byproduct recovery of other critical minerals, reduce environmental footprint, and support significantly higher production volumes.

Spot Antimony Pricing

Traditional Western spot-pricing benchmarks, including assessments for material in Rotterdam reported by Argus Media and other leading sources, fundamentally miss this key distinction. While an antimony market has clearly emerged, current published antimony pricing does not accurately reflect the true scarcity of usable, specification-compliant material capable of producing MIL-SPEC products. If the broader market fully understood and priced in the significant issues around acceptable feedstock quality and processing requirements, the realized commodity price would be substantially higher than it is today. This market inefficiency is exactly why USAC believes North America should develop its own dedicated pricing index in collaboration with domestic producers of critical minerals such as antimony. A North American index would provide greater transparency, better reflect the economics of secure high-specification supply, and help establish appropriate floor pricing that allows American companies to invest, expand, and succeed in this strategically essential sector.

Commenting on the Radersburg milestone announced today, Mr. Gary C. Evans, Chairman and CEO of USAC stated, "The commissioning of our Radersburg flotation facility represents another transformative step in building a secure, fully integrated domestic antimony supply chain. After targeted upgrades, we are now ready to begin the process of material from our own Montana operations and celebrate this achievement with a ribbon cutting ceremony today with Governor Greg Gianforte, a key supporter of all of our initiatives in the great state of Montana. We were honored to also have the Governor tour our Thompson Falls Stibnite Hill mine and Smelter last year. This midstream asset at Radersburg was the only missing piece of our vertical integration plan. Looking ahead, the potential Hydromet facility at this permitted site will fundamentally change what we can process, moving beyond today's strict grade and impurity limits to accept a broader spectrum of antimony-bearing ores from around the world. Assuming all of our current growth objectives are met over the next several years, we believe USAC is positioned to deliver 50% of product to the US market. In a market reshaped by global supply disruptions and surging demand from defense, energy, and technology sectors, management and our board has positioned USAC to deliver reliable, high-quality supply at scale others cannot match for years to come."

About USAC:

United States Antimony Corporation and its subsidiaries in the U.S., Mexico, and Canada ("USAC," "U.S. Antimony," the "Company," "Our," "Us," or "We") sell antimony, zeolite, and precious metals primarily in the U.S., Mexico, and Canada. The Company mines, purchases, and processes ore primarily into antimony oxide, antimony metal, antimony trisulfide, and precious metals at its facilities located in Montana and Mexico. Antimony oxide is used to form a flame-retardant system for plastics, rubber, fiberglass, textile goods, paints, coatings, and paper, as a color fastener in paint, and as a phosphorescent agent in fluorescent light bulbs. Antimony metal is used in bearings, storage batteries, and ordnance. Antimony trisulfide is used as a primer in ammunition. The Company also recovers precious metals, primarily gold and silver, at its Montana facility from third party ore. At its Bear River Zeolite ("BRZ") facility located in Idaho, the Company mines and processes zeolite, a group of industrial minerals used in water filtration, sewage treatment, nuclear waste and other environmental cleanup, odor control, gas separation, animal nutrition, soil amendment and fertilizer, and other miscellaneous applications. Beginning in 2024 and continuing in 2025, the Company acquired mining claims, real properties (patented claims) and leases located in Alaska, Montana, and Ontario, Canada in an effort to reduce the cost of third-party antimony ore purchases and to expand its product offerings.

Learn more about United States Antimony Corporation at www.usantimony.com.

Forward-Looking Statements:

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including, without limitation, statements regarding the Company's future operations, production levels, financial performance, business strategy, market conditions, demand for antimony, zeolite, other critical minerals, and precious metals, expected costs, and other statements that are not historical facts. These statements are based on current expectations, estimates, forecasts, and projections about the industries in which the Company operates, as well as management's beliefs and assumptions. Words such as "anticipates," "expects," "intends," "plans," "believes," "seeks," "estimates," "may," "will," "should," "could," and variations of these words or similar expressions are intended to identify such forward-looking statements.

Forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those indicated in such statements, including, but not limited to: fluctuations in the market prices and demand for antimony and zeolite; changes in domestic and global economic conditions; operational risks inherent in mining and mineral processing; geological or metallurgical conditions; availability and cost of energy, equipment, transportation, and labor; the Company's ability to maintain or obtain permits, licenses, and regulatory approvals; changes in environmental and mining laws or regulations; competitive factors; the impact of geopolitical developments; and the effects of weather, natural disasters, or health pandemics on operations and supply chains. Additional information regarding risk factors that could cause actual results to differ materially is included in the Company's filings with the U.S. Securities and Exchange Commission, including its Annual Report on Form 10-K and Quarterly Reports on Form 10-Q.

The Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof.

Investor Relations Contact:	Media Relations Contact:
Jonathan Miller, VP, Investor Relations	Edge Consulting, Inc.
4438 W. Lovers Lane, Unit 100	Anthony D. Andora
Dallas, TX 75209	1560 Market Street, Ste. 701
E-Mail: Jmiller@usantimony.com	Denver, Colorado 80202
Phone: 406-606-4117	Email: Anthony@EdgeConsultingSolutions.com
	Phone: 720-317-8927

SOURCE: United States Antimony Corp.

View the original press release on ACCESS Newswire

FAQ

What did United States Antimony (UAMY) announce about its Radersburg flotation mill on July 7, 2026?

United States Antimony announced wet commissioning of its Radersburg flotation mill. According to USAC, the mill follows a $4.75 million acquisition plus about $2 million of upgrades and is preparing to process roughly 800 tons of antimony ore from its Stibnite Hill operations.

How will the Radersburg flotation mill support United States Antimony’s $245 million Department of War contract (UAMY)?

The Radersburg mill is intended to upgrade antimony ore into high-grade concentrate. According to USAC, this additional throughput will help fulfill its $245 million sole-source Department of War MIL-SPEC antimony metal contract and meet commercial fire-retardant product obligations.

What investments has United States Antimony (UAMY) made in the Radersburg facility and laboratory?

United States Antimony reports a $4.75 million purchase of the Radersburg mill and around $2 million in upgrades. According to USAC, an additional ~$1 million funded a new laboratory with full sample prep, 3-kilowatt XRF, fire assay, and wet chemistry capabilities.

When is United States Antimony (UAMY) expecting full commissioning and concentrate production at Radersburg?

USAC expects full commissioning of the new laboratory and subsequent concentrate production in mid-July 2026. According to USAC, mill production will start once the lab is fully commissioned to provide process and product control for antimony concentrates.

What is United States Antimony’s Hydromet refinery proposal at Radersburg and its estimated cost (UAMY)?

United States Antimony has applied to the U.S. Department of Energy for support of a Hydromet refinery at Radersburg. According to USAC, the project has an estimated $44 million build cost, with $35.2 million requested in government funds to process broader antimony feedstock.

How does the Radersburg flotation mill fit into United States Antimony’s integrated supply chain strategy (UAMY)?

The Radersburg mill provides the concentration stage between mining and smelting. According to USAC, it completes a fully integrated, 100% company-owned chain from ore mining in Montana and Alaska through flotation to smelting in Thompson Falls and Mexico for finished antimony products.

What production capability does United States Antimony (UAMY) target for the U.S. antimony market?

United States Antimony management believes the company could supply a significant share of the U.S. market. According to USAC, assuming current growth objectives are achieved over several years, it believes it is positioned to deliver 50% of product to the U.S. market.