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


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June 3, 2019. Thompson Falls, Montana. United States Antimony Corporation (“USAC”, NYSE American “UAMY”) reported continued expansion of its Madero, Coahuila, Mexican smelter capacity. This will include the installation of long rotary furnace (LRF) number 3. The Company has an additional 3 LRFs in inventory. Furnace recovery is in the 96%-98% range and the additional capacity is expected to handle production increases from the Company’s Wadley and Sierra Guadalupe Mines.

Three long rotary furnaces at the Madero smelter in Coahuila, Mexico

Although antimony is not a rare earth, the U.S. Government considers it to be critical and strategic due its military applications.  China currently controls 92% of the world supply of antimony products. Historically, China had relied on its domestic mines for ore, but its raw material supply has dwindled, and they are now importing 74.2% of their feed from Russia, Kyrgyzstan, Tajikistan, Myanmar, Australia, Honduras, Bolivia, Turkey, and other countries. While China no longer dominates the supply of antimony ore, the country continues to subsidize its antimony smelting industry in order to dominate the processing of the metal like it has done in several other rare earth elements.


If a trade war lingers with China or a direct military conflict with China or other nations begins, the U. S. is not prepared for a disruption of the antimony supply chain.


USAC is the only significant North American producer of strategic antimony products that include antimony metal, antimony oxide, sodium antimonate, and antimony trisulfide: 

  • Antimony metal is alloyed with lead as a hardener for bullets and for lead-acid deep-cycle industrial batteries for trucks and heavy equipment.

  • Antimony oxide is a flame retardant in textiles such as clothing, tents, canvas, carpeting and other industrial fabrics. It is extensively used as a flame retardant in most plastic goods such as electrical wire insulation, vehicle and aircraft interiors, molded plastic goods, and plastic cabinets.

  • ·Sodium antimonate is used as a fining agent or degasser for optical glass used in cameras, field glasses, microscopes and telescopes. It is also used as a flame retardant in high temperature styrene products.

  • Antimony trisulfide is used in primers for all center-fired ordnance and is a strategic material to the U. S. military. It is also used in various pyrotechnics for flares and other fireworks, for tracer bullets, and for friction brakes in aircraft, trucks and other vehicles.

In addition to USAC’s infrastructure of processing equipment, the Company owns or controls large reserves of antimony in North America which make USAC more attractive as a vertically integrated and strategic supplier.

Estimated sales for May 2019 were as follows:



Antimony pounds


Zeolite short tons


Inventories of Mexican antimony mine ore continue to grow. The average Rotterdam price for antimony metal during May 2019 was $6,972 per metric ton or $3.16 per pound.  

The Puerto Blanco leach plant located in the state of Guanajuato, Mexico is in the testing phase for the production of gold and silver from the Los Juarez mine.

CEO John Lawrence said “USAC is expanding production of antimony to shield some of the U.S. antimony market from any retaliatory Chinese rare earth policies.   The Company will soon have three LRF furnaces in place.  In addition, USAC is preparing to begin pilot production of its gold, silver, and antimony project at Los Juarez which will further augment its strong existing supplies of antimony in North America and will launch the Company into precious metals production.”


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. 


Forward Looking Statements:

This Press Release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 that are based upon current expectations or beliefs, as well as a number of assumptions about future events, including matters related to the Company's operations, pending contracts and future revenues, ability to execute on its increased production and installation schedules for planned capital expenditures and the size of forecasted deposits. Although the Company believes that the expectations reflected in the forward-looking statements and the assumptions upon which they are based are reasonable, it can give no assurance that such expectations and assumptions will prove to have been correct. The reader is cautioned not to put undue reliance on these forward-looking statements, as these statements are subject to numerous factors and uncertainties. In addition, other factors that could cause actual results to differ materially are discussed in the Company's most recent filings, including Form 10-KSB with the Securities and Exchange Commission.

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