U.S. Antimony Company (NYSE: UAMY) said Thursday it has resumed mining at its Stibnite Hill property in Montana after a roughly five-month hiatus.
In November, the company announced that it had suspended its activities at the site due to weather conditions. The cessation came after only weeks Raw ore mining began from Stibnite Hill For sampling at the flotation mill in Radersburg after approval from the State of Montana.
The plan is to process the material into antimony concentrate and then transport it to USAC’s smelter in Thompson Falls, where it will be converted into finished products and sold to its customers.
Antimony has many major industrial uses, including defensive applications such as flame-resistant fabrics, communications equipment, night vision goggles, ammunition, and laser vision. The United States has no production of antimony from mines, and thus relies on foreign suppliers such as China for the vital mineral used by its military forces.
USAC’s Thompson Falls site is currently the only antimony smelter in the United States. It also owns the only other company in North America: Madero in Mexico.
With the commencement of operations at Stibnite Hill – a former mine that operated for 15 years from the late 1960s to the early 1980s – the company is looking to establish itself as the first integrated antimony operation outside of China and Russia.
USAC noted on its website that its Thompson Falls smelter can produce approximately 15 million pounds of antimony oxide or 5 million pounds of antimony metal annually, and is expanding to enhance that production capacity.
Mining Program 2026
USAC noted that during last year’s mining period, approximately 800 tons of antimony ore were brought from the mountain to the Radersburg facility. In October, the company said there were early indications that the material could be upgraded to meet military specifications.
The company said the restart was earlier than expected due to “moderate weather conditions” and “minimal snowfall” in Montana.
This year, USAC is also looking to make several changes to its mining program, including using a chipper to cut through brush and smaller branches to produce mulch that will be used in the concurrent reclamation program.
This will help revegetate faster while providing better access to existing roads and trails as mining activities begin for 2026, she said.
The company also said it plans to set up base stations on nearby mountaintops, where GPS transmitters will be set up so its field crews can use portable data collectors to more accurately map and record antimony vein intercepts, enabling antimony veins to be dropped on strike and dip.
US Antimony shares rose 4.5% after announcing the resumption of mining, erasing their losses during the week. The company that recently It is listed on the New York Stock ExchangeIts market capitalization is $1.2 billion.
