American Tungsten & Antimony Ltd has mobilised a drill rig and commenced a maiden diamond drilling program at the Dutch Mountain Tungsten Project in Tooele County, Utah.

The Phase 1 campaign comprises approximately 1,000 metres of drilling across 11 planned holes, with the majority testing along strike at the historic Fraction Lode mine. The project includes the Fraction Lode, which operated as America's last active tungsten-producing mine before processing ore in 2017. American Tungsten & Antimony acquired a 100% interest in the project and the associated processing facility in January 2026, securing the Clifton Mining District's fully permitted tungsten processing plant.

In March 2026, the company submitted a Notice of Intent for exploration drilling at the Fraction Lode. That planning has now advanced to on-site operations, following an initial surface sampling program that returned high-grade rock chip assays up to 11,764 ppm W (1.48% WO₃) and tungsten-in-soil anomalies reaching 504 ppm W. The land position was expanded in June 2026 through new claim staking along favourable intrusive-limestone contacts to the south and west.

“The United States has not mined tungsten since 2017, and waiver relief for defence contractors buying Chinese-sourced tungsten reduces from January 2027. The strategy for AT4 is vertical integration between ore and downstream processing assets. With Dutch Mountain, Tennessee Mountain and the Nightingale tungsten prospects, combined with a concentrator to be refurbished at Dutch Mountain and a proposed APT circuit at Del Sol under assessment, AT4 intends to build a domestic route from mine to metal to meet US critical mineral supply in tungsten and antimony.”

— Casper Adson, Chief Executive Officer

Upon completing the Dutch Mountain program, the company expects to shift its drill rig to the Tennessee Mountain Tungsten Project in Nevada, with drilling anticipated to start in October 2026.

Read the full announcement: Tungsten Drilling Commences at Dutch Mountain