ANTIMONY(STIBNITE)
PROCESSING
USAC
Transforms Stibnite & Produces Antimony Finished Products
To Empower Industry
& the U.S. Supply Chain
Applications for our Antimony Products
Munitions
Semiconductors
Flame Retardants
Batteries
USAC
TEAMING WITH
U.S. GOVERNMENT
USAC continues to develop collaboration with USG
After USAC received its final approval for producing MIL SPEC antimony trisulfide from the DOD/DLA in March of 2023, discussions ramped up toward the end of 2024. When China banned the export of critical minerals, including antimony, to the United States in December 2024, USAC's processing and antimony product production expertise became vital to both U.S. defense supply and industry.
Now...
These ramped up discussions have now resulted in an IDIQ sole source contract worth up to $245 Million awarded to USAC for the production of antimony metal ingots for the DLA to replenish the U.S. stockpile. The first order under this contract for approximately $10 Million was announced on September 30, 2025.
-SOUND ON-
Antimony was first used in ancient times and first described in text in 1540
Who we are. What we do.
United States Antimony Corporation ("USAC"), is a publicly traded (NYSE: UAMY), rapidly growing natural resource company that is increasing its raw material supply of antimony from third parties around the world, along with staking its own claims for over 32,000 acres to reactivate U.S. historical antimony deposits, to secure a fully domestic antimony supply chain. USAC has produced various antimony products since 1969 and is a fully integrated mining, transportation, milling, smelting, and selling company. USAC operates the only significant antimony smelter in the United States and it is in a “sold out” condition. The Company has proven experience in underground and open pit mining, flotation and gravimetric milling, crushing and screening, dry grinding, cyanide leaching, precious metal refining, pyro-metallurgy, and marketing.
Operations include a smelter and a precious metal refinery in Montana, and a smelter and three mills in Mexico.
EYES ON ZEOLITE
USAC owns 100% of Bear River Zeolite, Co., or BRZ. The BRZ mine is located in southeast Idaho and is regarded as one of the best zeolite properties in the world due to its purity of Clinoptilolite, high cation exchange capacity, low sodium content, hardness, uniformity, high potassium content, large surface area, and low clay and low impurity content.
Natural Zeolite is a mineral made up of microporous, crystalline aluminosilicate materials commonly used as commercial adsorbents and catalysts. They mainly consist of silicon, aluminium, and oxygen. Natural Zeolite has a negative charge which can attract and hold positively charged ions (cations) such as calcium, magnesium, potassium, sodium, cesium, and strontium. This is due to the arrangement of its aluminosilicate framework, where aluminum atoms (with a negative charge) replace some of the silicon atoms in the crystal structure. This negative charge allows clinoptilolite to attract and exchange positively charged ions in various applications, such as water treatment, agriculture, and air purification.
Zeolite may not be a common word in mainstream conversations, but its uses and the areas of industry and life that Zeolite touches are vast. Zeolite is depended upon for Agricultural, Industrial, and Household uses.
The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating a material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material. Based on this, he called the material zeolite, from the Greek (zéō), meaning "to boil" and (líthos), meaning "stone"
The largest applications for metallic antimony are in alloys with lead and tin, which have improved properties for solders, bullets, and plain bearings. It improves the rigidity of lead-alloy plates in lead–acid batteries. Antimony trioxide is a prominent additive for halogen-containing flame retardants. Antimony is used as a dopant in semiconductor devices.
Semiconductors: The Future of Antimony
"The study’s researchers have taken a step in this direction by developing a type of layered material called a heterostructure. The heterostructure in the study consists of a layer of a topological insulator material, bismuth antimony telluride or (Bi,Sb)2Te3, and a superconducting material layer, gallium." READ MORE
USAC has strengthened its Board by continuing to add seasoned board members with Wall Street expertise
