United States Antimony Corporation (USAC) NYSE (uamy) is a rapidly growing natural resource company that is increasing its raw material supply of antimony from properties in Mexico and third parties around the world. 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. Three Mexican properties supply direct shipping ore (DSO) or mill feed for the Mexican operations. The Los Juarez property and mill at Puerto Blanco are being permitted to start gold and silver production that will supplement the antimony values and identify the Company as a "precious metal producer." 

USAC owns 100% of the Bear River Zeolite, Corp. mine in southeast Idaho that management  regards as one of the best zeolite properties in the world due to its high cation exchange capacity, low sodium content, hardness,  uniformity, high potassium content, large surface area, and low clay and impurity content.

  • USAC Corporate Offices and Plant,Thompson Falls, Montana
  • Madero Smelter, Coahuila, Mexico
  • Puerto Blanco Flotation/Gravity Mill, Guanajuato, Mexico
  • Antimony Oxide Ore Gravity Mill, Wadley, San Luis Potosi, Mexico
  • Mining - Los Juarez Property, Queretaro, Mexico
  • Mining - Soyatal District, Queretaro, Mexico
  • Mining - Sierra Guadalupe, Zacetecas, Mexico
  • Mining - Guadalupana, Queretaro, Mexico
  • Bear River Zeolite Pit, Preston, Idaho
  • Bear River Zeolite Plant, Preston, Idaho
USAC Corporate Offices and Plant,Thompson Falls, Montana1 Madero Smelter, Coahuila, Mexico2 Puerto Blanco Flotation/Gravity Mill, Guanajuato, Mexico3 Antimony Oxide Ore Gravity Mill, Wadley, San Luis Potosi, Mexico4 Mining - Los Juarez Property, Queretaro, Mexico5 Mining - Soyatal District, Queretaro, Mexico6 Mining - Sierra Guadalupe, Zacetecas, Mexico7 Mining - Guadalupana, Queretaro, Mexico8 Bear River Zeolite Pit, Preston, Idaho9 Bear River Zeolite Plant, Preston, Idaho10

SALES estimates for



Antimony pounds 215,740
Zeolite tons 1007
Silver ounces Accruing for shipment September
Gold ounces 7.080 shipped + accruing
for shipment September






 September 11, 2017. Thompson Falls, Montana. United States Antimony Corporation (“USAC”, NYSE American “UAMY”) reported the successful production of antimony tri-sulfide per military MIL-A-159D specification. The product is used in all center-fire cartridges for military and commercial production. Initial production was on a small scale, but additional equipment is being installed to enter the market. The product contains 70.5% antimony. At a Rotterdam price for metal at $3.833 per pound, the antimony in the tri-sulfide would be worth approximately $10.75 per pound. Additional markets include the friction brake industry.

SEMARNAT (Mexican equivalent of the EPA) is expected to approve the cyanide circuit at the Puerto Blanco mill for the Los Juarez gold/silver/antimony property within 30 days.

At the beginning of August 2017, the average Rotterdam price of Grade I antimony metal per metric ton was $8,200 ($3.7194 per pound), and by the end of August, the price had increased to $8,450 ($3.833 per pound), an increase of 3.6%.  

Mexican mine production has been increasing and all emphasis is to reopen Soyatal by building powder magazines and Guadalupe by reopening a road.

The BRZ zeolite plant in Idaho capacity has been increased significantly. New markets are being pursued and sales should be increasing.

CEO John Lawrence said “Antimony remains the core business and we are excited about antimony tri-sulfide production, increasing Mexican mine production, and starting gold/silver/antimony production at Loss Juarez. At the present time, we are evaluating several opportunities that could significantly enhance production and cash flow.”

About U.S. Antimony


US Antimony is a growing, vertically-integrated natural resource company that has production and diversified operations in precious metals, zeolite and antimony. 

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