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
JUNE 2018


Antimony pounds


Zeolite short tons



Commodity prices :



May, 2018

Antimony metal







July 2, 2018. Thompson Falls, Montana. United States Antimony Corporation (“USAC”, NYSE American “UAMY”) reported successful testing of a new product, antimony tri-sulfide (also called “needle antimony” or “crudum”). The product is used as a primer component in center- fired ordnance. China has historically been the principal source of the product in the United States and most other countries. The USAC antimony tri-sulfide has complied with the military specification of MIL-A-159D. The product is now being offered to commercial manufacturers of ordnance. USAC will source the antimony ore from one of its Mexican mines and it will be transported to its floatation mill in Guanajuato, Mexico. The floatation concentrate will be shipped directly to Montana for processing. The processing cost using a proprietary method developed by USAC will be cheaper than the production of antimony metal or oxide. Additionally, the price for the contained antimony is significantly higher than that in antimony oxide or antimony metal.   Besides the ordnance market, a larger market for the product is in the friction brake industry. The Company has received request for the product from Japan and Europe.

Antimony has always been considered a “strategic metal” during wars. The USAC Stibnite Mine in Thompson Falls contributed antimony during World Wars I and II and the Korean and Viet Nam Wars. Antimony metal is used to harden lead in bullets and heavy duty military batteries for vehicles, tanks, ships, and submarines. Antimony oxide is used as a flame retardant in plastics in aircraft, ships, and vehicle interiors and in insulation on electrical wire. Antimony tri-sulfide is used for ordnance primers, tracer bullets, pyrotechnics, and for friction brakes. On May 18, 2018, the Department of Interior named antimony as a “critical commodity” for the “Nations security and economic prosperity.”

The construction of the cyanide leach-plant for the processing of the Los Juarez gold/silver/antimony ore is on schedule for testing during Q4, 2018. 

CEO John Lawrence said “We are excited about the potential profitability for the sale of antimony tri-sulfide and the shake down of the Los Juarez  gold/silver/antimony plant. We expect to announce our progress on several additional strategic and financial opportunities that do not involve dilution of any kind.”

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