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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July 1, 2019. Thompson Falls, Montana. United States Antimony Corporation (“USAC”, NYSE American “UAMY”) announced that the Puerto Blanco flotation mill in Guanajuato, Mexico will commence milling the 30,000 metric ton stockpile of Los Juarez gold/silver/antimony ore in July 2019. The decision has come after exhaustive testing of the recovery of gold and silver from legacy flotation concentrates.

The concentrate that was tested was produced from approximately 415 metric tons of Los Juarez ore and represents about 50% of the total value of the precious metals (it does not include most of the antimony value or any of the precious metal values that will be recovered from the mill tailings by the CIL circuit). The concentrate was caustic leached at the Madero smelter to remove most of the antimony.  Subsequently, 8.03 metric tons of the leach residue were shipped to Montana to recover the gold, silver, and remaining antimony. After processing, 8.464 ounces of gold and 846.1 ounces of silver were sold. The recovery of both the gold and silver from the flotation concentrates was 98%.

The ratio of gold to silver in the flotation concentrate was 1 ounce of gold per 126 ounces of silver. Historically in smaller samples, the ratio has been on the order of 1ounce of gold per to 250 to 500 ounces of silver. This lower ratio could mean that there may be coarse gold that went undetected in the periodic sampling of the concentrates and only appeared when the total concentrate was smelted. In addition, the higher gold values are likely a result of higher-grade gold areas in the ore body. The shallow drilling program revealed many areas where the gold was in the 0.10 to more than 1.0 ounce per metric ton.

The CIL circuit will be started as soon as the flotation mill and caustic circuits have been shaken down.

The recovered values of Los Juarez after flotation, caustic leaching of the flotation concentrates and cyanide leaching of the flotation tailings are estimated below:







Value /mt


0.035 opmt


0.0315 oz




3.27 opmt


2.88 oz.






10.06 #









A shipment of precious metals made on June 24, 2019 from testing of the Los Juarez flotation circuit that included 8.464 ounces of gold and 846.1 ounces of silver.

The installation of the two new LRF furnaces at the Madero smelter in Mexico has materially increased the capacity of the plant and significantly reduced costs. Coal consumption has been reduced from 30% to 12.5% of the feed to each LRF. Natural gas, electricity, and manpower have been reduced, and the cost benefits will show up in Q3. One LRF has replaced six SRF furnaces for roasting slags. A third LRF is now installed. The Madero smelter will now produce crude metal for the Montana Smelter to make oxide or finished metal to be sold directly to the consumer which will also cut costs significantly.

LRF Number 3 installed with cooling ducting, baghouse, and stack

Estimated sales for June 2019 are as follows:



Antimony pounds


Zeolite short tons


Gold ounces, North America


Silver ounces, North America


Gold ounces, Mexico


Silver ounces, Mexico


The average Rotterdam price for antimony metal during June 2019 was $6,481.57 per metric ton or $2.94 per pound. USAC sales of antimony averaged  $3.44 per pound.

CEO John Lawrence said “After many years, we are happy to announce the start of production of gold and silver from Los Juarez. USAC will move cautiously during the start up to not make any mistakes. Management believes the deposit is a major Company builder and we are very excited.”

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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