IsoEnergy Launches Major Drilling Program at Utah’s Flatiron Uranium Project

IsoEnergy has commenced a 15,000-foot drilling program at its Flatiron project in Utah’s Henry Mountains uranium district, marking the first systematic exploration of the area since Plateau Resources conducted initial work in the early 1980s.

The program consists of ten surface rotary holes with core tails, targeting the Salt Wash Member of the Morrison Formation—the primary uranium host unit across the district, which has historically produced approximately 1.4 million pounds of U3O8.

“Commencing these exploration programs in Utah marks an exciting new chapter for IsoEnergy in the United States,” said CEO Philip Williams. “While advancing our past-producing mines toward production remains a top priority, our geological team has also identified compelling new exploration targets that we believe are ready to be tested.”

The Flatiron project encompasses 8,800 acres through 370 lode claims and two Utah state leases, creating one of the largest contiguous land positions in the historically productive Henry Mountain District. Strategically positioned along the projection of uranium mineralization trends, the property sits approximately seven miles northwest of IsoEnergy’s Tony M uranium mine.

The company’s approach leverages historical exploration conducted by Plateau Resources, which performed wide-spaced, district-scale drilling to identify uranium mineralization beneath surface cover. The highest-priority results from those historical programs are located within current Flatiron claims, though they were never followed up due to the uranium market downturn of the 1980s.

“This program will be the first to evaluate high-potential targets defined by historic work but never followed up on due to unfavorable market conditions,” Williams noted.

Beyond Flatiron, IsoEnergy’s 2025 Utah exploration campaign includes continued fieldwork at the Daneros and Sage Plain properties—both past-producing uranium mines currently on standby. The company’s approach involves detailed mapping of prospective host units and conducting numerous measured sections of available outcrop to identify modern analogs of distributary channel systems.

This methodical geological work aims to develop a conceptual target generation framework and determine appropriate geophysical survey techniques to locate productive units efficiently. The comprehensive approach reflects IsoEnergy’s strategy of building thorough geological understanding before committing to expensive drilling programs.

IsoEnergy’s U.S. expansion coincides with increasing national focus on domestic uranium supply security. Recent discussions about expanding the U.S. Strategic Uranium Reserve highlight growing recognition of uranium’s strategic importance to energy independence.

“The call for secure domestic uranium supply is only intensifying, as reflected in recent discussions about expanding the U.S. Strategic Uranium Reserve, and we believe IsoEnergy is well positioned to play a meaningful role as both a near- and long-term domestic supplier,” Williams explained.

The company maintains a toll milling arrangement with Energy Fuels for its Utah assets, eliminating the need for significant processing infrastructure investment while enabling production when market conditions warrant. This arrangement reduces capital requirements for production restart while maintaining operational control over mining activities.

IsoEnergy has positioned itself as a globally diversified uranium company with assets across top uranium mining jurisdictions in Canada, the United States, and Australia. The company’s flagship Larocque East project in Canada’s Athabasca Basin houses the Hurricane deposit, which boasts what the company describes as the world’s highest-grade indicated uranium mineral resource.

This diversified asset base provides multiple pathways for uranium production across different timeframes. The Utah properties offer near-term production potential given their past-producing status, while projects like Larocque East provide longer-term development opportunities with exceptional resource grades.

The scientific and technical aspects of IsoEnergy’s exploration programs receive oversight from Dr. Dan Brisbin, P.Geo., the company’s Vice President of Exploration and designated Qualified Person under NI 43-101 standards.

As uranium markets continue to strengthen amid growing recognition of nuclear power’s role in clean energy transitions, IsoEnergy’s systematic approach to exploring historical targets positions the company to potentially expand its resource base in proven uranium districts while advancing its near-term production capabilities.