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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


MONTHLY NEWSLETTER

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UNITED STATES ANTIMONY REPORTS THE SUCCESSFUL START UP OF LOS JUAREZ GOLD AND SILVER PRODUCTION

HIGHLIGHTS

1.    The initial cyanide leach recoveries of the Los Juarez gold and silver have been successful.

2.    Minor changes in the cyanide circuit have been made and will further enhance recoveries.

3.    The overall Los Juarez recovery involves utilizing caustic and cyanide leach circuits.

4.    The startup and use of the cyanide leach could result in gold values that are greater than the global average ore grades. More production this year will verify final global estimates.

......................

March 2, 2020. Thompson Falls, Montana. United States Antimony Corporation (“USAC”, NYSE American “UAMY) reported that the initial production recoveries of the Los Juarez gold and silver cyanide leach plant are successful

USAC began exploration, development, mining and milling of the Los Juarez deposit in 2006. Detailed mapping and sampling delineated jasperoid silica-rich mineralized pipes over an east-west strike length of 3.5 kilometers with a maximum width of 1 kilometer.

After years of metallurgical work, permitting, and construction, the Company has established the following processes to maximize recovery:

 

LOS JUAREZ MINE

Preliminary exploration indicates that it is a deep-seated silica- rich jasperoid with the following global assays and inferred recovered grades:

Metal

Assay

Recovery

Recovered

Value

Value /mt

Gold

0.035 opmt

90%

0.0315 oz

$1,600/oz

$49.60

Silver

3.27 opmt

85%

2.7795 oz

$18.00/oz

$49.86

Antimony

0.652%

70%

10.06 #

$3.15/#

$31.69

Total

 

 

 

 

$131.15

Global assay results and exhaustive metallurgical work have indicated a ratio of approximately1 ounce of gold to 90 to 130 ounces of silver. The bulk of the gold appears to be not homogenous or recoverable by flotation. The problem is that the gold may be coarse, not liberated from the gangue, or associated with oxide minerals that are not amenable to flotation. Accordingly, the gold may be of a higher grade. The variation in gold grades is illustrated in the following shallow drill holes:

Hole

Interval meters

Gold

opt

Gold

g/t

Silver

opt

Silver

g/t

Antimony

%

LJ8

1.5-3

0.268

8.33

6.17

191.89

0.280

LJ8

3-4.5

0.712

22.14

7.75

241.03

0.235

SJ23

0-1

0.010

0.31

10.5

326.6

1.19

SJ31

0-.8

<0.002

<0.06

14.5

451.0

0.853

SJ36

0-1

<0.002

<0.06

6.88

214.0

0.571

SJ38

0-1

<0.002

<0.06

4.02

125.0

0.445

SJ51

0-1.2

0.168

5.225

2.46

76.5

0.0930

SJ54

0-1

0.448

13.93

3.52

109.5

0.106

SJ54

1-2

0.186

5.785

2.41

74.95

0.0681

SJ54A

1-2

0.174

5.411

1.90

55.1

0.0856

SJ54B

0-1

0.812

25.253

2.06

64.1

0.9068

SJ54B

1-2

0.650

20.215

2.35

73.09

0.0800

SJ54C

0-1

0.276

8.639

0.844

26.25

0.1130

SJ54C

1-2

0.476

14.804

2.40

74.64

0.0985

SJ54D

0-1

0.236

7.340

0.706

21.96

0.0788

SJ54E

0-1

0.182

5.660

0.218

6.78

0.0415

SJ54G

0-1

0.326

10.139

0.438

13.62

0.107

SJ56

0-1

0.500

15.55

3.73

116.0

0.274

SJ56

1-2

0.436

13.560

3.89

120.98

0.256

SJ56A

1-2

0.110

3.421

3.78

117.6

0.0811

SJ56D

0-1

0.176

5.474

0.94

29.2

0.126

 

FLOTATION MILL

The recovery of precious metals in the flotation concentrate was poor. The typical gold recovery was less than 25%, and the silver recovery was less than 70%. Antimony recoveries have generally been less than70%, but they are expected to increase when mining is below the surface oxidized zone. Since the silver is associated with the antimony, the silver flotation recovery is also expected to increase with depth.

FLOTATION MILL CONCENTRATES AND CAUSTIC LEACH

Generally only 30% to 40% of the gold and silver was recovered from the flotation mill concentrates by the USAC proprietary smelting process. This problem was solved by leaching the antimony out of the concentrates with a caustic leach and resulted in nearly a 100% recovery of gold and silver from the concentrates.

FLOTATION MILL TAILINGS AND CYANIDE LEACH

The flotation tailings that contained up to 75% of the gold and 30 to 40% of the silver are taken to a carbon in cyanide leach circuit (CIL). Some seven leaches have been completed. The gold recoveries have been in the 86% range, and the silver recoveries have been lower. Overall recoveries of gold and silver are being enhanced by circuit modifications to achieve a gold recovery of 90% or better and a silver recovery to 85%.

REFINING

The precious metals are concentrated in the Montana refinery and sold in the United States.

 

ANTIMONY & ZEOLITE

Production during the month of February was as follows:

Product

February 2020 sales

 Antimony pounds

114,428

Zeolite short tons

942

From the middle of January 2020, the Rotterdam price of antimony increased from $5,700.00 per metric ton or $2.585 per pound, to $6,400.00 per metric ton or $2.903 per pound. This is an increase of $0.318 per pound which should impact our sales in the future. .  Antimony prices have climbed in the past several weeks due to production curtailments and supply restrictions related to the ongoing Coronavirus (COVID-19) epidemic in China.  The Company has been approached by several customers seeking new and diversified supplies of antimony products.

 

CEO John Lawrence said “The initial trials of the cyanide leach circuit for Los Juarez have been a success. We intend to have further details on estimated grades as production is ramped up. Proceeds from the 100 ton per day pilot will be used to complete the installation of the 400 ton per day mill.”

 

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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