8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported) November 24, 2025

Registrant’s telephone number, including area code:

(406

) 606-4117

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 5.02 – Departure of Directors or Certain Officers; Electionof Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

On November 24, 2025, upon the recommendation of the Governance and Nominating Committee, the Board of Directors (the “Board”) of United States Antimony Corporation (NYSE: UAMY) (NYSE Texas: UAMY) (“USAC,” “US Antimony,” or the “Company”) appointed Jon R. Marinelli, to serve as a director of the Company, effective immediately. With Mr. Marinelli’s appointment, the USAC board size increases to seven members, five of which are Independent. Mr. Marinelli has also been appointed Chairman of a new board committee formed yesterday, the Finance Committee.

Mr. Marinelli is a seasoned financial executive and investment professional with more than 25 years of experience in capital markets, M&A, and strategic advisory roles, and has an early-career background in technology. He is the Founder and Principal of 1042 Capital Partners, where he manages public and private investments. Previously, he served as Group Head and Managing Director of U.S. Energy at BMO Capital Markets, and before that held senior roles in Deutsche Bank’s Global Banking–Natural Resources Group, the successor to Bankers Trust. Over his career, Mr. Marinelli has advised on more than $285 billion in M&A, public and private equity, and debt transactions. He holds an MBA from Rice University and a BS from Miami University.

Mr. Marinelli will serve until the Company’s next annual meeting of shareholders and until his successor is duly elected and qualified, or until his earlier death, resignation, or removal. There are no arrangements or understandings between Mr. Marinelli and any other person pursuant to which he was selected as a director, and there are no transactions involving Mr. Marinelli that are required to be disclosed under Item 404(a) of Regulation S-K.

Any compensation payable to Mr. Marinelli for his service as a director will be consistent with the Company’s previously disclosed standard compensation arrangements for non-employee directors.

Item 7.01 Regulation FD Disclosure.

On November 25, 2025, US Antimony issued a press release (“Press Release”) announcing the appointment of Jon R. Marinelli to the Board. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information furnished under this Item 7.01, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, except as expressly set forth by specific reference in such filing. This Item 7.01 of this Current Report on Form 8-K will not be deemed an admission as the materiality of any information in this Item 7.01 that is required to be disclosed solely by Regulation FD.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit 99.1

United States Antimony Announces the Appointment

of a New Independent Board Member

~ Jon R. Marinelli ~

“The CriticalMinerals and ZEO Company”

~ Antimony, Cobalt,Tungsten, and Zeolite ~

**DALLAS,TX / ACCESS Newswire / November 25, 2025 /**United States Antimony Corporation (“USAC,” “US 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 the addition of Jon R. Marinelli as an Independent Director to USAC’s board of directors effective yesterday. With Mr. Marinelli’s appointment, the USAC board size increases to seven members, five of which are Independent. Mr. Marinelli has also been appointed Chairman of a new board committee formed yesterday, the Finance Committee.

Mr. Marinelli is a seasoned financial executive and investment professional with more than 25 years of experience in capital markets, M&A, and strategic advisory roles, and has an early-career background in technology. He is the Founder and Principal of 1042 Capital Partners, where he manages public and private investments. Previously, he served as Group Head and Managing Director of U.S. Energy at BMO Capital Markets, and before that held senior roles in Deutsche Bank’s Global Banking–Natural Resources Group, the successor to Bankers Trust. Over his career, Mr. Marinelli has advised on more than $285 billion in M&A, public and private equity, and debt transactions. He holds an MBA from Rice University and a BS from Miami University.

Commenting on the appointment of Jon R. Marinelli to the board of directors, Mr. Gary C. Evans, Chairman and CEO of USAC stated, “Jon and I have been working together for over twenty-seven years now. He has been involved with a combination of financing, investment banking, and advisory services for my prior companies when he was employed at Bankers Trust, Deutsche Bank, and BMO. The totality of these various financings exceeds $5 Billion over this period of time. We are at a point in USAC’s life cycle where strong successful business acumen is a continuous need. I look forward to working with Jon again and anticipate him being a large contributor to our existing outstanding board of directors.”

In response, Jon R. Marinelli stated, “I am delighted to join the Board of United States Antimony Corporation. The Company’s unique position in North America’s antimony and critical minerals supply chain, combined with its ambition for scale and disciplined execution, presents a rare and compelling opportunity. I look forward to working closely with the Board and management team, bringing my financial, strategic advisory, and capital-markets experience to support disciplined growth, prudent capital deployment, and long-term value creation.”

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. and Canada. The Company processes third party 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. During 2024 and 2025, the Company began acquiring mining claims and leases located in Montana, Alaska and Ontario, Canada in an effort to expand its operations as well as its product offerings.

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 the most recent Annual Report on Form 10-K and subsequent 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.