US Antimony Strengthens Domestic Supply Chain With Montana Mill Purchase

United States Antimony Corporation announced this morning that it has completed the acquisition of a fully operational critical minerals flotation facility in Radersburg, Montana, strengthening the company’s domestic processing footprint for antimony and other strategic minerals. As a reminder and as we noted late last year, UAMY operates the only two antimony smelters in North America.

The company said it closed on the $4.75 million all-cash purchase of the property and equipment on January 16, 2026. The Radersburg facility, located between Helena and Bozeman, sits within roughly 250 miles of US Antimony’s Thompson Falls smelter, which is currently undergoing a major expansion and modernization that remains on track for completion and commissioning in February.

According to the company’s press release, the Radersburg Mill is equipped with both gravity and flotation circuits, allowing it to concentrate a wide range of minerals, including stibnite, the primary ore mineral for antimony, as well as gold, silver, copper, tungsten, and other metals. The facility includes crushing and grinding circuits, slurry-based recovery systems, and tailings storage ponds with water recycling capabilities.

Gravity concentration equipment at the site has historically been used to produce high-grade gold concentrates, while the flotation circuits can be tailored with specific reagents to recover various metals. The company noted the mill has previously processed gold, silver, copper, lead, and zinc, and could be adapted to concentrate cobalt, tungsten, platinum group metals, rare earth elements, and other critical minerals.

In addition to the purchase price, US Antimony has budgeted approximately $2 million for future capital improvements to enhance specific equipment at the facility.

Commenting on the acquisition, Chairman and CEO Gary C. Evans said the flotation mill is a necessary link in the company’s production chain. “In order for us to concentrate our raw ore from both Alaska and Montana, we must first utilize a modern flotation mill to properly concentrate the material to a high enough level that we can then feed the various furnaces located in our smelters in order to produce mil-spec antimony trisulfide,” Evans said.

He added that owning the Radersburg facility outright provides greater operational control compared with leasing. US Antimony previously leased a similar mill in Philipsburg, Montana, but canceled that lease in September 2025 after negotiations with the owners became difficult. “Making necessary capital improvements to a leased facility versus one that we control 100% made this an easy decision,” Evans said.

Evans described the acquisition as another step in reinforcing the company’s vertically integrated model. “This transaction announced today is another ‘leg on our stool’ as a fully integrated antimony company in order to maximize profitability, control our destiny, and meet the ever-growing needs of our customers whether they be industrial or the federal government,” he said.

United States Antimony announced in Q4 last year that it had received a $10 million delivery order under its newly signed indefinite delivery, indefinite quantity sole-source contract with the US Defense Logistics Agency. The order covered 315,000 lbs. of antimony metal ingots, which will be used to replenish the US National Defense Stockpile.

Antimony, a critical mineral which is used in munitions, batteries, flame retardants, and military-grade compounds, has been flagged by defense officials as a vulnerability in the U.S. industrial base.

The Trump administration has made domestic supply-chain resilience a policy priority. Trump has taken a series of executive and policy actions aimed at securing U.S. access to critical minerals, citing national security and economic independence.

Recall, last year we laid out all the winners in the coming critical mineral scramble in “The Coming Rare Earth Revolution And How To Profit: All You Need To Know About The “Ex-China Supply Chain.” Those who put on the recommended baskets are currently enjoying high double-digit gains.