American Antimony Reports First MTA Results: 30.3% Sb Average Head Grade Produces 63% Sb Concentrate at 97% Recovery
Rhea-AI Summary
American Antimony (OTCID:XTPT) reported metallurgical test results from a ~400 kg bulk sample of Antimony King Mine material, showing a 30.2% Sb measured head grade and production of a ~63% Sb concentrate with ~97% antimony recovery using a simple flotation flowsheet.
ALS Metallurgy reported mineralogy (stibnite 41.8%, quartz 47.8%) and an overall metallurgical balance supporting scalable concentrate production pathways.
Positive
- Measured head grade of 30.2% Sb
- Produced concentrate grade of 62.6%–~63% Sb
- Antimony recovery of ~96.7–97% to concentrate
- Bulk sample size of ~400 kg used for testing
Negative
- High gangue quartz content of 47.8%, implying significant non‑pay mineral mass
- Final tailings represent 50.7% of mass, indicating moderate mass yield to concentrate
News Market Reaction – XTPT
On the day this news was published, XTPT declined 4.76%, reflecting a moderate negative market reaction.
Data tracked by StockTitan Argus on the day of publication.
AUSTIN, TX / ACCESS Newswire / March 9, 2026 / American Antimony Corporation, operating as Xtra Energy Corp. (OTCID:XTPT), today announced excellent test results using material sourced from the Company's Antimony King Mine within the American Antimony Project in Bernice Canyon, Nevada. The test work was completed by ALS Metallurgy of Kamloops, BC, under the supervision of International Metallurgical and Environmental Inc. Historically, the Antimony King Mine has produced high-grade materials for the recovery of antimony. Test work results indicate that a simple flotation process can produce very high-grade antimony concentrates of approximately 63 percent antimony, at very high antimony recoveries of approximately 97 percent of the contained antimony.
A bulk sample of approximately 400 kilograms was provided to ALS Metallurgy for test work purposes. The test work program consisted of mineralogical evaluation, preliminary flotation tests and production of a bulk concentrate sample. Shown in the following two tables are detailed analysis of the bulk sample chemistry and the key mineralogical results provided by ALS Metallurgy.
ANALYSIS OF AMERICAN ANTIMONY BULK SAMPLE
Sample | Assay - percent or g/tonne | ||||
Sb | Fe | S | Au | Ag | |
American Antimony Bulk Sample | 30.2 | 0.9 | 12.4 | 0.28 | 10.4 |
MINERAL COMPOSITION OF AMERICAN ANTIMONY BULK SAMPLE | |
Minerals | Mineral Content |
Stibnite | 41.8 |
Antimony Oxides | 0.8 |
Pyrite | 0.4 |
Arsenopyrite | 0.2 |
Other Sulphide Minerals | 0.3 |
Iron Oxides | 1.0 |
Quartz | 47.8 |
Calcium Carbonates | 4.4 |
Other silicates | 3.3 |
Total | 100 |
Shown in the following table are the results of flotation testing of the bulk sample. A very high-grade antimony concentrate of approximately 63 percent antimony was produced. Recovery of antimony to this concentrate was also very high, in excess of 96 percent. This concentrate is expected to be very well received in the antimony concentrate market.
AMERICAN ANTIMONY BULK SAMPLE | ||||||||||||
Overall Metallurgical Balance | ||||||||||||
Product | Weight | Assay - percent or g/tonne | Distribution - percent | |||||||||
% | grams | Sb | Fe | S | Au | Ag | Sb | Fe | S | Au | Ag | |
ANTIMONY CONC. | 45.4 | 910.7 | 62.6 | 1.0 | 26.2 | 0.52 | 24 | 96.7 | 36.5 | 98.0 | 86.5 | 96.8 |
CLEANER TAILINGS | 3.9 | 77.3 | 11.6 | 2.9 | 3.54 | 0.30 | 4 | 1.5 | 9.0 | 1.1 | 4.2 | 1.4 |
FINAL TAILINGS | 50.7 | 1016.8 | 1.05 | 1.3 | 0.20 | 0.05 | 0.4 | 1.8 | 54.5 | 0.8 | 9.3 | 1.8 |
Recalculated Feed | 100.0 | 2004.8 | 29.4 | 1.2 | 12.1 | 0.27 | 11.3 | 100 | 100 | 100 | 100 | 100 |
Measured Feed | 100.0 | 30.2 | 0.9 | 12.4 | 0.28 | 10.4 | ||||||
The bulk sample material did not show any significant weathering or degradation of metallurgical performance, due to exposure or prolonged stockpiling at the Antimony King mine site.
The antimony flotation concentrate is shown below in the following photograph. The process employed at ALS Metallurgy is very simple and incorporates grinding of the material to approximately 75 microns and conditioning the slurry with a simple flotation activator and flotation collector.
The flotation results seen in this test work demonstrates a key strength of the Antimony King project, the ability to produce exceptional quality concentrates at very high antimony recoveries.
These results also provides a strong technical foundation for advancing scalable concentrate production pathways. The achieved head grades, concentrate grades, and recovery metrics represent key performance benchmarks in flotation-based antimony processing and materially strengthen the Company's confidence in the Antimony King system, as it progresses through staged development.
Commentary from CEO Mac J. Shahsavar, P.Eng., Chairman and Chief Executive Officer of American Antimony Corporation.
"This is a defining milestone in our staged development strategy, high head grades are important, but converting them into premium-grade concentrate at high recovery is what ultimately demonstrates real production potential. A ~
About American Antimony Corporation
American Antimony Corporation (OTCID:XTPT), operating as Xtra Energy Corp., is advancing high-grade antimony assets in the United States to support secure, domestic supply of this critical industrial mineral, which is used in flame retardants, batteries, defense alloys, and emerging energy applications.
The Company's flagship American Antimony Project comprises approximately 201 claims totaling 4,153 acres in the prolific Bernice Canyon district of Nevada and includes the historically productive Antimony King Mine. Recent exploration and metallurgical work have returned exceptionally high antimony head grades, reinforcing the high-grade potential of the system.
In addition, the Company has expanded its Nevada footprint through the acquisition of 1,240 acres at the Stibium Creek Project in Lander County, a proven antimony corridor with established mineralization and infrastructure. American Antimony is pursuing a disciplined, staged development strategy encompassing exploration, permitting, metallurgy, and early-stage mining, with the objective of producing high-grade antimony concentrates to support domestic and global supply needs.
Contact & Learn More:
Xtra Energy Corporation
Phone: 512-412-3636
Email: secretary@americanantimony.com
Website: www.americanantimony.com
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LinkedIn: American Antimony
X (Twitter): @AmericanSbCorp
Instagram: @xtraenergycorp
Facebook: Xtra Energy Corp
Forward-Looking Statements
This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements reflect the Company's current expectations and assumptions regarding future events or financial performance and are subject to a number of known and unknown risks, uncertainties, and other factors that may cause actual results, performance, or achievements to differ materially from those expressed or implied. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release. Such statements involve numerous risks and uncertainties, many of which are beyond the Company's control, including, but not limited to, the Company's ability to raise capital, successfully execute its business plan, and achieve anticipated operational or financial results. The Company undertakes no obligation to publicly update or revise any forward-looking statements to reflect subsequent events, circumstances, or changes in expectations, except as required by applicable law. For a more complete discussion of risk factors and uncertainties, readers are encouraged to review the Company's disclosures filed with OTC Markets Group Inc., available at: https://www.otcmarkets.com/stock/XTPT/disclosure.
SOURCE: Xtra Energy Corp.
View the original press release on ACCESS Newswire
FAQ
What metallurgical grade did American Antimony (XTPT) report from the Antimony King bulk sample on March 9, 2026?
What concentrate grade and antimony recovery did American Antimony (XTPT) achieve in the March 9, 2026 test results?
How large was the sample and what test methods were used in the American Antimony (XTPT) metallurgical program?
What key mineralogy did American Antimony (XTPT) report for the Antimony King bulk sample?
What processing route did American Antimony (XTPT) test and is it scalable for concentrate production?
