IsoEnergy Reports Strong Initial Results at Hurricane South Trend, Expands Athabasca Land Position

• IsoEnergy has resumed summer drilling at the Larocque East Project following a temporary wildfire-related suspension, with an 8,000-metre diamond drill program planned across up to 20 holes on the Hurricane South Trend.
• All 4 completed drill holes returned elevated radioactivity, with the strongest result measuring 11,075 counts per second over 3.5 metres, including 43,160 counts per second over 0.5 metres.
• The strongest intercept was drilled approximately 75 metres east of a winter 2026 hole that returned 4.21% uranium oxide concentrate over 3.5 metres and is interpreted by the company as confirming continuity of the L Fault Zone along strike.
• In 2026, IsoEnergy staked approximately 61,830 hectares across 32 claims and optioned approximately 31,293 hectares across 20 claims from GEM Oil Inc. to expand its eastern Athabasca Basin land position.
• Following recent staking, the GEM Oil option agreement and the divestment of the Bulyea River property, IsoEnergy now holds or has access to approximately 344,812 hectares in the eastern Athabasca Basin.

Company Overview

IsoEnergy Ltd. (NYSE American: ISOU | TSX: ISO) is a globally diversified uranium company with current and historical mineral resources in Canada, the US and Australia at varying stages of development. The company is advancing its Larocque East Project in Canada's Athabasca Basin, home to the Hurricane deposit, which the company describes as holding the world's highest-grade Indicated uranium Mineral Resource. IsoEnergy also holds a portfolio of permitted, past-producing conventional uranium and vanadium mines in Utah with a toll milling arrangement in place with Energy Fuels Inc., currently on standby for potential restart.

Drilling Resumes on the Hurricane South Trend

IsoEnergy Ltd. has announced the resumption of summer drilling at the Larocque East Project in the eastern Athabasca Basin, Canada, following a temporary suspension and precautionary evacuation due to nearby wildfires. Prior to the suspension, 4 of 20 planned drill holes had been completed, with 2 additional holes in progress. All 4 completed holes returned elevated radioactivity. The summer program targets 8,000 metres of diamond drilling across up to 20 holes, with a focus on the Hurricane South Trend.

The strongest intercept to date returned 11,075 counts per second over 3.5 metres, including 43,160 counts per second over 0.5 metres, and was drilled approximately 75 metres east of the winter 2026 intercept of 4.21% uranium oxide concentrate over 3.5 metres. The company states the result confirms the continuity of the L Fault Zone along strike on the Hurricane South Trend. All radioactivity measurements are averages of 3 points measured over 0.5 metres along the drill core using an RS-125 spectrometer. All reported widths are along the drill hole and are not necessarily true widths.

Vice President of Exploration at IsoEnergy Ltd., Dan Brisbin, commented: 

"Our team is excited to resume drilling on the Hurricane South Trend, where early results from the summer program continue to reinforce the prospectivity of the trend. Every completed hole has intersected anomalous radioactivity, including 43,160 counts per second over a 0.5-metre interval. These results continue to demonstrate the potential to expand Hurricane mineralisation beyond the current resource footprint. With the immediate fire risk abated, we anticipate completing the 8,000 metre summer drill program as designed. In addition, we have expanded and consolidated coverage of prospective corridors through staking and through an option agreement."

Additional Hole Results

A second hole was drilled approximately 45 metres east of a prior drill hole that intersected a historical high-grade intercept of 20.4% uranium oxide concentrate over 6.5 metres in 2021, testing the J Fault Zone. The hole returned elevated radioactivity of 980 counts per second over 3 metres straddling the unconformity, including 1,580 counts per second over 0.5 metres. The company notes that the intersection of graphitic pelite and the interpreted target fault in the basement suggests this hole was positioned slightly hanging wall of the optimal target.

A third hole was drilled 30 metres east of a prior hole that returned 2.75% uranium oxide concentrate over 0.5 metres on the South Trend. The hole intersected weakly elevated radioactivity of 450 counts per second at a depth of 0.5 metres below the unconformity. A fourth hole tested the L Fault Zone at the unconformity and intersected elevated radioactivity of 620 counts per second over 0.5 metres, approximately 3 metres above the unconformity.

Land Position Expansion

IsoEnergy has expanded and consolidated its land position across what the company describes as prospective structural corridors in the eastern Athabasca Basin, staking approximately 61,830 hectares across 32 claims in 2026, across the Dorado Joint Venture (JV) and IsoEnergy's Larocque West, Hawk, Evergreen, East Rim and Ledge projects, per the July 8, 2026, press release. The company has also optioned approximately 31,293 hectares across 20 claims from GEM Oil Inc., comprising the Larocque West Extension claims, which the Company states are notably underexplored for uranium mineralisation, with only 4 drill holes completed on the claims, of which only 2 targeted uranium.

IsoEnergy has concurrently divested its Bulyea River property. Following the divestment, recent staking and the GEM Oil Inc. option, IsoEnergy now holds or has access to approximately 344,812 hectares of land in the eastern Athabasca Basin, including its interest in the JV with Purepoint Uranium Group Inc.

Next Steps

Summer drilling at the Larocque East Project has resumed, with the company targeting completion of the 8,000 metre, 20-hole program as designed. Assay results from all 4 completed holes remain pending and will be released when available.

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