8-K: US Antimony Raises 2026 Revenue Guidance on Montana Mine

United States Antimony Corporation announced a significant operational update on its Montana mining activities, leading to a preliminary increase in Fiscal Year 2026 revenue guidance by $25 million to $125 million.

Summary

• USAC provided an operational update on its Montana mining activities at Stibnite Hill.
• A mechanized exploration and bulk sampling program began on October 7, 2025, after permit approval on October 2, 2025.
• The company is using a 'cut and cover' surface mining method with modern hydraulic excavators.
• A hydraulic hammer was mobilized on October 8, 2025, to break ore, enabling excavation and loading.
• To date, 9 tandem dump truckloads totaling 239 tons of high-grade stibnite have been hauled from Stibnite Hill.
• The antimony ore (over 250 tons) is being hauled to a flotation mill near Radersburg, Montana, for crushing, sampling, and assaying by Childs Geological Services, an independent Qualified Person.
• USAC staked 102 federal mining claims to cover extensions of the stibnite veins and is discussing purchasing remaining patented claims.
• Operations on Stibnite Hill will temporarily cease when weather conditions dictate but will resume in the spring.
• Preliminary test work by the company's metallurgical team indicates the material can be upgraded to meet military specifications for munitions primers.
• USAC is currently the only North American company approved as a sole-source supplier of antimony trisulphide to the Defense Logistics Agency.
• The company is preliminarily raising its Fiscal Year 2026 financial revenue guidance by $25 million to $125 million.
• Profit margins from mining own antimony material are anticipated to be approximately three times greater than buying from third parties.
• Expansion of the Thompson Falls smelter, which began in May 2025, is expected to be operational with new furnaces in January 2026.
• USAC holds approximately 10% of Larvotto Resources' outstanding shares and will continue to assess a constructive path forward, despite Larvotto's board rejecting an acquisition proposal.

Sentiment

Score: 8

Explanation: The filing indicates significant positive operational developments, including successful mining resumption, increased revenue guidance, and improved profit margins from internal sourcing. The strategic importance as a sole-source supplier to the DLA and ongoing smelter expansion are strong positives. The only minor negative is the Larvotto acquisition rejection, but the company is focused on internal growth.

Positives

• Successful resumption of mining activities at Stibnite Hill, Montana, using a new 'cut and cover' surface mining method.
• High-grade stibnite allows for profitable operation without long lead times and large capital investment.
• Anticipated profit margins from mining own antimony are approximately three times greater than buying from third parties.
• Preliminary test work indicates Stibnite Hill material can meet military specifications for munitions primers.
• USAC is the only North American approved sole-source supplier of antimony trisulphide to the Defense Logistics Agency.
• Expansion of the Thompson Falls smelter is on track to be operational with new furnaces in January 2026.
• Fiscal Year 2026 revenue guidance preliminarily raised by $25 million to $125 million.
• Staked 102 federal mining claims to cover extensions of stibnite veins on open ground.

Negatives

• Larvotto Resources' board elected not to proceed with USAC's proposal to acquire the company.
• Operations on Stibnite Hill will temporarily cease when weather conditions dictate.

Risks

• 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.
• Ability to maintain or obtain permits, licenses, and regulatory approvals.
• Changes in environmental and mining laws or regulations.
• Competitive factors.
• Impact of geopolitical developments.
• Effects of weather, natural disasters, or health pandemics on operations and supply chains.

Future Outlook

The company anticipates its expanded Thompson Falls smelter to be operational with new furnaces in January 2026. It expects similar additional antimony source material from Alaska mining activities resuming in April/May 2026, which could lead to a substantial expansion of its Madero, Mexico smelter. USAC is also focused on advancing its own upstream sources of antimony to support a secure and resilient domestic supply chain.

Management Comments

• "This announcement today is a game changer for all USAC shareholders." Gary C. Evans, Chairman and CEO.
• "When we began operations on Stibnite Hill earlier this year, we anticipated finding antimony deposits, but nothing like we are currently experiencing." Gary C. Evans, Chairman and CEO.
• "We currently anticipate that profit margins mining our own antimony material will be approximately three times greater than buying from third parties." Gary C. Evans, Chairman and CEO.
• "Our significant expansion of our existing smelter located at Thompson Falls that began in May 2025 could not happen at a better time. We plan to be operational with our new furnaces in January 2026, only two months from now." Gary C. Evans, Chairman and CEO.
• "Once we are back in operations with actual mining activities in Alaska during the months of April/May of 2026, we currently are highly confident of similar additional antimony source material that we will subsequently transfer via truck to our expanded facility in Thompson Falls." Gary C. Evans, Chairman and CEO.
• "Assuming that occurs, this will then allow us to consider substantially expanding our Madero, Mexico smelter to handle additional international supplies that are arriving weekly." Gary C. Evans, Chairman and CEO.
• "The recently announced increase in antimony supply is an important factor in our decision not to re-engage with the management or the board of Larvotto Resources at this time." Gary C. Evans, Chairman and CEO.
• "While we respect the board's decision, we do not necessarily agree with its reasoning." Gary C. Evans, Chairman and CEO, regarding Larvotto's rejection.
• "We continue to believe that integrating Larvotto's future antimony production with our established smelting and refining capabilities represents the most effective framework to strengthen the Western world's critical-minerals supply chain and reduce dependence on Chinese processing capacity." Gary C. Evans, Chairman and CEO.
• "We will continue to assess whether a constructive path forward may exist with Larvotto. In the meantime, we remain fully focused on advancing the development of our own upstream sources of antimony to support a secure and resilient domestic supply chain." Gary C. Evans, Chairman and CEO.

Industry Context

This announcement highlights the ongoing global focus on securing critical mineral supply chains, particularly antimony, to reduce dependence on dominant producers like China. USAC, as the only fully integrated antimony company outside of China and a sole-source supplier to the DLA, is strategically positioning itself to capitalize on this trend by developing domestic upstream sources and expanding processing capabilities. The rejection of the Larvotto acquisition underscores the competitive landscape and the importance of internal resource development for critical minerals.

Comparison to Industry Standards

• USAC is the only fully integrated antimony company in the world outside of China, indicating a unique market position.
• The company is the only North American approved sole-source supplier of antimony trisulphide to the Defense Logistics Agency, highlighting its strategic importance for military applications.
• The anticipated profit margins from mining its own antimony (three times greater than buying from third parties) suggest a strong competitive advantage in cost structure compared to peers reliant on external sourcing.
• The 'cut and cover' mining method, utilizing modern hydraulic excavators, represents an innovative approach to narrow vein mining, potentially offering efficiency gains over traditional methods used by previous operators.

Stakeholder Impact

• Shareholders: Positive impact due to increased revenue guidance, higher anticipated profit margins, and strategic development of internal antimony sources.
• Employees: Continued employment and potential growth opportunities with expanded operations in Montana, Alaska, and Mexico.
• Customers (e.g., Defense Logistics Agency): Enhanced supply security for critical antimony products, especially antimony trisulphide for munitions.
• Suppliers: Potential for increased demand for equipment and services related to mining and processing expansion.
• Local Communities (Montana): Economic activity and job creation from mining operations, with ongoing reclamation efforts.

Next Steps

• Operations at Stibnite Hill will temporarily cease due to weather but resume in the spring.
• The Stibnite Hill Team will be occupied with mine planning, additional permit applications, and reclamation plan development.
• Metallurgical test work is ongoing to ensure Stibnite Hill material can be used in the company's full complement of products.
• New furnaces at the expanded Thompson Falls smelter are planned to be operational in January 2026.
• Actual mining activities in Alaska are expected to resume in April/May 2026.
• Consideration of substantially expanding the Madero, Mexico smelter if Alaska mining is successful.
• Continue to assess a constructive path forward with Larvotto Resources.
• Advance the development of own upstream sources of antimony.

Key Dates

Recommendation

The significant operational update from Stibnite Hill, Montana, coupled with a substantial increase in Fiscal Year 2026 revenue guidance and a projected threefold increase in profit margins from self-sourced antimony, represents a major positive catalyst. The company's unique position as the only fully integrated antimony producer outside China and a sole-source supplier to the DLA underscores its strategic importance. The planned smelter expansion and future Alaskan mining activities further strengthen its long-term growth prospects and supply chain resilience. Despite the Larvotto acquisition setback, the focus on internal resource development and strong financial outlook make this a compelling investment opportunity.

Keywords

Antimony, Mining, Critical Minerals, Zeolite, Montana, Stibnite Hill, USAC, UAMY, Revenue Guidance, Smelter, Defense Logistics Agency, Exploration, Mineral Processing, Corporate Governance