American Tungsten & Antimony Reports High-Grade Antimony Discovery in Utah, Highlighting Potential for Major U.S. Critical Minerals Deposit

Rhea-AI Summary

American Tungsten & Antimony (OTCQB: ATALF) reported high-grade antimony intersections from initial drilling at the Little Emma Prospect, Antimony Canyon, Utah. Key intercepts include 11.03m @ 3.1% Sb (incl. 2.62m @ 12.54% Sb) and 8.47m @ 2.67% Sb (incl. 2.2m @ 9.69% Sb).

The company says mineralization appeared in four of seven holes and grades up to 66.47% Sb were recorded, supporting a potential large hydrothermal antimony system and domestic critical‑minerals significance.

Positive

• Initial drilling returned 11.03m @ 3.1% Sb
• Higher‑grade internal zones, e.g., 2.62m @ 12.54% Sb
• Mineralization in 4 of first 7 holes
• Recorded peak grade up to 66.47% Sb
• Project sits within a block containing >20 historic antimony mines

Negative

• Results are from a maiden program; no resource estimate has been reported yet
• U.S. currently relies heavily on foreign antimony supply, so commercial scalability remains unproven

NEW YORK, March 11, 2026 /PRNewswire/ -- American Tungsten & Antimony Ltd. (ASX: AT4; OTCQB: ATALF) today reported high-grade antimony results from its first drill holes at the Little Emma Prospect within the Company's 100%-owned Antimony Canyon Project in Utah, marking a strong start to its maiden drilling program and reinforcing the potential for a large-scale antimony system in the United States.

The initial drilling program intersected shallow, high-grade stibnite mineralization, providing early confirmation of the Company's geological model and demonstrating encouraging continuity within the mineralized system.

Key intercepts include:

• 11.03m @ 3.1% Sb from 25.91m, including 2.62m @ 12.54% Sb from 29.2m
• 8.47m @ 2.67% Sb from 31.15m, including 2.2m @ 9.69% Sb from 36.88m
• 2.14m @ 3.02% Sb from 40.23m

The Little Emma Prospect is one of more than 20 historic antimony mines located within AT4's patented claim block at Antimony Canyon, highlighting the district-scale exploration potential across the property.

These results follow the Company's ASX announcement dated 10 March 2026, which outlined the encouraging results from the initial drilling campaign.

Additional details can be found here:
https://cdn-api.markitdigital.com/apiman-gateway/ASX/asx-research/1.0/file/2924-03066387-6A1315549

Exceptional Grades in a Strategic U.S. Critical Mineral

"Intersecting mineralization in four of our first seven holes is an exceptional start at Antimony Canyon," said Andre Booyzen, Managing Director of American Tungsten & Antimony.

"Outstanding grades of up to 66.47% Sb highlight the strength of the system. These results compare very favorably with grades reported from major North American antimony deposits such as the Stibnite Gold Project in Idaho, currently being advanced by Perpetua Resources."

Mr. Booyzen noted that the scale of alteration and mineralization already observed indicates the potential for a large hydrothermal system capable of hosting a significant antimony resource.

"Many of the world's largest antimony deposits are located in China and were developed within similar hydrothermal systems. The mineralization we are seeing at Antimony Canyon shows characteristics consistent with those large Chinese deposits," explained Booyzen.

"With extensive sulphidation and large anomalous zones already identified, we believe Antimony Canyon has the potential to emerge as a major new antimony district in the United States, and potentially one of the largest antimony deposits discovered domestically," he said

Strategic Timing as U.S. Seeks Secure Antimony Supply

Antimony is classified by the U.S. Government as a critical mineral essential for national security, with applications in defense systems, semiconductors, batteries, flame retardants and advanced manufacturing.

The United States currently relies heavily on foreign sources for antimony supply, with China historically dominating global production.

The emergence of a significant domestic antimony resource would represent an important development for U.S. supply chain security.

Expanding U.S. Critical Minerals Portfolio

American Tungsten & Antimony is focused on re-establishing domestic supply of antimony and tungsten, two minerals essential to defense and industrial supply chains.

In addition to the Antimony Canyon Project in Utah, the Company is advancing a growing portfolio of U.S. projects including:

• Tennessee Mountain Tungsten Project – Nevada
• Sage Hen Tungsten Project – Nevada
• Nightingale Tungsten Project – Nevada
• Dutch Mountain Tungsten Project – Utah

Together these projects position AT4 as an emerging developer of strategically important critical minerals in the United States, supporting the growing need for secure domestic supply chains.

View original content:https://www.prnewswire.com/news-releases/american-tungsten--antimony-reports-high-grade-antimony-discovery-in-utah-highlighting-potential-for-major-us-critical-minerals-deposit-302710468.html

SOURCE American Tungsten and Antimony

FAQ

What antimony drill results did ATALF report at Little Emma on March 11, 2026?

The company reported intercepts including 11.03m @ 3.1% Sb and 8.47m @ 2.67% Sb. According to the company, these are from initial holes and include higher‑grade internal intervals such as 2.62m @ 12.54% Sb and 2.2m @ 9.69% Sb.

How significant is the Little Emma discovery for ATALF's Antimony Canyon project?

The discovery is an early but promising indication of a larger system; mineralization occurred in 4 of 7 holes. According to the company, shallow, high‑grade stibnite and alteration suggest district‑scale potential warranting follow‑up drilling and evaluation.

Does ATALF compare Antimony Canyon grades to other North American deposits?

Yes, management said grades compare favorably to major North American antimony deposits such as Stibnite in Idaho. According to the company, peak assays reached 66.47% Sb, supporting the comparison to higher‑grade systems.

What are the next steps for ATALF after the March 11, 2026 drill results?

The company will likely continue exploration and expand drilling to test continuity and scale. According to the company, the maiden program’s encouraging early results support additional drilling to delineate the system and assess resource potential.

How could Antimony Canyon affect U.S. critical mineral supply if successful?

If developed, Antimony Canyon could add domestic antimony supply and reduce reliance on imports. According to the company, a significant U.S. deposit would bolster supply‑chain security for defense and industrial applications, but commercial development remains uncertain at this stage.