Material Event (Form 8-K)

Item 8.01. Other Events.

On October 17, 2025, United States Antimony Corporation (the "Company") filed a prospectus supplement (the "Prospectus Supplement") under the Company's automatic shelf registration statement on Form S-3 (File No. 333-290901) that was originally filed with the Securities and Exchange Commission (the "SEC") on October 16, 2025 and was immediately deemed effective by the SEC (the "Registration Statement"), relating to the offer and sale of a total of up to $400,000,000 of shares of the Company's common stock, par value $0.01 per share (the "Shares"), pursuant to the Amended and Restated Sales Agreement with A.G.P./Alliance Global Partners and B. Riley Securities, Inc. dated September 17, 2025.

The opinion of Duane Morris LLP relating to the validity of the Shares offered by the Prospectus Supplement is filed herewith as Exhibit 5.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The Shares are registered pursuant to the Registration Statement and the base prospectus contained therein, and offerings for the Shares will be made only by means of the Prospectus Supplement. This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction.