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
May 2018


Antimony pounds


Zeolite short tons



Commodity prices :



May, 2018

Antimony metal






June 4, 2018. Thompson Falls, Montana. United States Antimony Corporation (“USAC”, NYSE American “UAMY”) reported initial testing of the Los Juarez gold/silver/antimony floatation concentrates in Montana. Following is a flow diagram of the operation:

The Los Juarez mine, Puerto Blanco mill, and Madero smelter are operational and the cyanide leach plant is being constructed.  Gold, silver and antimony are being recovered from the Los Juarez flotation concentrates in Montana on a test basis. Testing of the plant is anticipated in Q4 2018.

On May 18, 2018 the Department of Interior published the Final List of Critical Minerals 2018 stating “The United States is heavily reliant on import of certain mineral commodities that are vital to the Nation’s security and economic prosperity.” The list names antimony as a “critical commodity”.

BRZ zeolite orders for most applications were up again in May, but the plant had a maintenance problem that delayed production of more than 300 tons that had been ordered. We anticipate filling these orders by the end of Q2, 2018

USAC generally sells antimony contained for more than $4.00 per pound. Mexican production exceeds our North American supply.

CEO John Lawrence said “We are excited to start the shake down of the Los Juarez pilot plant in Q4 2018 and to continue construction of the 400 ton mill. 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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