Exploration Confirms Extensive Tungsten System at Dutch Mountain

Infrastructure Hub Provides Accelerated Development Pathway for Critical Mineral Project

Published on Feb. 25, 2026

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American Tungsten & Antimony Ltd has completed a first-pass soil and rock chip sampling program at its 100%-owned Dutch Mountain Tungsten Project in Tooele County, Utah. The project includes the highly prospective Fraction Lode tungsten system, which was the last operating tungsten mine in the United States before ceasing production in 2017. The broader system also includes the Star Dust and E.H.B. Lode mines, where historical mining reported grades of up to 1.3% WO3.

Why it matters

The Dutch Mountain Project is a cornerstone of AT4's strategy to consolidate high-grade tungsten assets in the Great Basin. The acquisition provides a central processing hub for numerous private historical mines in the district that currently lack a viable route to market, helping to revitalize American production of this critical mineral.

The details

Grid-controlled sampling was conducted across key target areas at the Dutch Mountain Project. The project includes the Fraction Lode tungsten system, which historically targeted head grades of 1.7% WO3, as well as the nearby Star Dust and E.H.B. Lode mines that previously reported grades up to 1.3% WO3. The broader Clifton District hosts numerous significant historical mines that have been constrained by the absence of a local, compliant processing facility, which the Dutch Mountain Project aims to address.

  • The Dutch Mountain Project was recently acquired by American Tungsten & Antimony Ltd.
  • The first-pass soil and rock chip sampling program was completed in early 2026.

The players

American Tungsten & Antimony Ltd

An ASX-listed company advancing critical mineral development in Tier-1 US jurisdictions, with a strategic vision to become a vertically integrated, conflict-free supplier to Western economies.

Dutch Mountain Tungsten Project

A 100%-owned tungsten project in Tooele County, Utah that includes the highly prospective Fraction Lode tungsten system and other historical mines.

Fraction Lode

The last operating tungsten mine in the United States before ceasing production in 2017, with historical head grades of 1.7% WO3.

Star Dust Mine

A nearby historical mine with mineralization occurring in the basal layers of a limestone 'roof pendant' suspended within the intrusive stock.

E.H.B. Lode

A nearby historical mine that previously produced 2,374 tons of ore at an average grade of 1.3% WO3, confirming the exceptional potential of the Eocene contact zone.

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What they’re saying

“The Dutch Mountain Project is a cornerstone of AT4's strategy to consolidate high-grade tungsten assets in the Great Basin. The acquisition is an infrastructure-led solution for 'stranded' assets, providing a central processing hub for numerous private historical mines in the district that currently lack a viable route to market.”

— Andre Booyzen, Managing Director (Company announcement)

“Senator Curtis, a Republican, has a distinguished record of public service, having previously served as the U.S. Representative for Utah's 3rd congressional district before his election to the Senate. His focus on energy independence, public land management, and fostering local innovation aligns with AT4's vision for the Dutch Mountain Project as a revitalised American producer of critical minerals.”

— Andre Booyzen, Managing Director (Company announcement)

What’s next

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The takeaway

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