IsoEnergy 24-Hole Summer 2025 Program in Athabasca Basin Expanding Uranium Exploration

• IsoEnergy has commenced a comprehensive summer 2025 exploration program across its eastern Athabasca Basin uranium properties, featuring 24 diamond drill holes totaling 11,000 metres of drilling focused on the Larocque East and Hawk projects.
• The program builds on encouraging results from recent drilling campaigns, with winter 2025 drilling at Larocque East intersecting the highest radioactivity readings to date outside the immediate Hurricane deposit area.
• Forest fire activity in Northern Saskatchewan has temporarily impacted mobilization, with operations initially limited to one drill based out of Points North until transport routes to the Larocque East camp are restored.
• The company is targeting both resource expansion at the existing Hurricane deposit and regional discovery opportunities, with drilling planned at multiple target areas including the previously unexplored 2,500-metre northern conductive trend.
• Additional exploration work across IsoEnergy's pipeline includes completed helicopter-borne surveys, planned satellite hyperspectral data acquisition, and prospecting activities at earlier-stage projects.

IsoEnergy (TSX: ISO) is a leading, globally diversified uranium company with substantial current and historical mineral resources in top uranium mining jurisdictions of Canada, the U.S., and Australia at varying stages of development. The company is currently advancing its Larocque East project in Canada's Athabasca Basin, which hosts the Hurricane deposit, boasting the world's highest-grade indicated uranium mineral resource. IsoEnergy also maintains a portfolio of permitted past-producing uranium and vanadium mines in Utah, positioning the company as both a near-term uranium producer and long-term resource developer.

Larocque East Project: Hurricane Deposit Expansion Strategy

The centerpiece of IsoEnergy's summer 2025 program is the Larocque East project, where 20 diamond drill holes totaling 7,600 metres are planned to follow up on encouraging results from the winter 2025 program. The drilling strategy focuses on two primary objectives: expanding the existing Hurricane deposit and testing regional discovery targets along the broader Larocque trend.

Hurricane Resource Expansion

Recent winter drilling has demonstrated significant potential for resource expansion along both the Hurricane Main and South trends. Winter drill holes LE25-194 and LE25-198 intersected strong radioactivity along the Main trend, with LE25-194 returning an average RS-125 spectrometer reading of 3,100 counts per second over 0.5 metres and a corresponding downhole probe maximum reading of 30,829 cps. Similarly impressive results were achieved along the South trend, where hole LE25-207 returned an average RS-125 reading of 8,800 cps over 0.5 metres and a corresponding downhole probe maximum reading of 30,096 cps.

These results provide clear direction for the summer program's resource expansion drilling, which will continue to test the potential of both trends through systematic step-out drilling near the existing deposit.

Regional Discovery Targets

Beyond resource expansion, IsoEnergy is pursuing multiple regional discovery opportunities along the Larocque trend. Dan Brisbin, Vice President Exploration, provided context for the exploration strategy:

"Our summer 2024 and winter 2025 drilling returned encouraging results at both Hurricane and along the Larocque trend, with strong radioactivity having been intersected. As we await geochemistry results for recent drilling, we are excited to pick up where we left off and continue advancing the potential for resource expansion along the main and south trends and additional discoveries along the 6-kilometre segment of the Hurricane trend to the east, particularly in target areas D and E."

Target Area D has emerged as a priority following winter drill hole representing the highest radioactivity intersected on the project to date outside of the immediate Hurricane area. Meanwhile, Target Area E has shown promising initial results straddling the unconformity, including 0.5 metres at 1,110 ppm U-p. Notably, the unconformity depth in this area was only 175 metres compared to 325 metres at the Hurricane deposit, potentially indicating more accessible mineralization.

Northern Conductive Trend Discovery

A significant development in IsoEnergy's exploration strategy is the identification of a previously unexplored 2,500-metre long conductive trend located 800 metres north of the main Hurricane conductor trend. This discovery emerged from a new geophysical model generated by Computational Geosciences Inc. and Convolutions Geoscience through joint inversion of historic electromagnetic and resistivity survey data.

The northern trend, designated as Target Area K, exhibits two key geophysical features similar to those at Hurricane: a flexure from a northeast trend to an east trend, and a conductivity decrease on the southwest end potentially due to alteration effects on the conductive host rocks. Brisbin emphasized the significance of this target:

"We are also eager to test, for the first time, the 2,500-metre trend located 800 metres north of the main conductor, an area that shares key geophysical characteristics with the deposit."

Hawk Project: Testing Regional Potential

The Hawk project represents IsoEnergy's efforts to expand beyond the Larocque East area, with four diamond drill holes totaling 3,400 metres planned to target coincident electromagnetic conductors and Ambient Noise Tomography velocity anomalies along a 12-kilometre-long prospective corridor.

Previous drilling at Hawk has intersected encouraging indicators of unconformity-style uranium mineralization potential. Winter 2024 drill holes intersected structural disruption, alteration, and broad zones of elevated radioactivity typical of such deposits. Notably, drill hole HK23-05A returned 168 ppm U-p over 2.0 metres in the basal sandstone, including 511 ppm U-p over 0.5 metres immediately above the unconformity.

The summer 2025 program at Hawk will incorporate advanced geophysical techniques to refine drill targeting. Planned activities include stepwise moving loop electromagnetic surveying to more accurately locate conductors than existing fixed loop surveys, and ANT surveys over the northern portion of the project to test for extensions of the existing velocity anomaly.

Brisbin noted the strategic importance of returning to Hawk:

"Lastly, we look forward to returning to the relatively underexplored Hawk project, where planned ground electromagnetic and ANT surveys will guide drilling later this summer."

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Exploration Pipeline Development

Operational Challenges and Adaptations

The summer 2025 program has faced initial challenges due to severe forest fire activity in Northern Saskatchewan. These conditions have impacted mobilization plans, forcing the company to initially operate with one drill based out of Points North while waiting for conditions to improve near La Ronge and along Highway 102.

The company has demonstrated operational flexibility in response to these challenges, with plans to open the Larocque East camp and deploy a second drill once safe transport routes are restored. This adaptive approach reflects IsoEnergy's experience operating in challenging northern environments and commitment to maintaining safety standards while advancing exploration objectives.

Satellite Survey

Beyond the primary drilling programs at Larocque East and Hawk, IsoEnergy is advancing a pipeline of exploration targets across its earlier-stage projects. This strategic approach ensures continuity in the company's exploration efforts and provides multiple pathways for future discoveries.

Recent activities include a completed helicopter-borne MobileMT survey at the East Rim project, with data processing and interpretation currently in progress. For the Bulyea River project, the company plans to acquire satellite hyperspectral survey data in June for remote mineral mapping to guide initial geological mapping, prospecting, and sampling activities planned for late summer.

These activities target areas with historic highly anomalous uranium lake sediment geochemistry and radiometric anomalies, providing early-stage exploration opportunities that could develop into future drilling targets.

Investment Strategic Outlook

IsoEnergy's summer 2025 exploration program represents a systematic approach to expanding its uranium resource base in one of the world's premier uranium mining districts. The program's dual focus on resource expansion at the proven Hurricane deposit and regional discovery along promising trends provides investors with both near-term resource growth potential and longer-term exploration upside.

The company's operational flexibility in adapting to forest fire challenges demonstrates management's ability to navigate operational complexities while maintaining exploration momentum. The integration of advanced geophysical techniques and systematic drilling approaches reflects a technically sophisticated exploration strategy designed to maximize discovery potential while managing exploration risks.

For uranium investors, IsoEnergy's summer program offers exposure to high-grade uranium exploration in a politically stable jurisdiction with established mining infrastructure. The company's position as both a near-term producer through its Utah assets and a resource expansion candidate through its Athabasca Basin projects provides portfolio diversification within the uranium sector.

Key Takeaway

IsoEnergy's summer 2025 exploration program positions the company to build upon recent encouraging drilling results while advancing multiple discovery opportunities across its eastern Athabasca Basin portfolio. With 24 drill holes targeting both resource expansion and regional discovery objectives, the program represents a significant investment in the company's long-term uranium resource development strategy.

The combination of high-grade mineralization intersected in recent drilling, advanced geophysical targeting techniques, and systematic exploration of proven uranium trends provides a foundation for potential resource growth and discovery success. For investors seeking exposure to high-grade uranium exploration in a world-class mining district, IsoEnergy's current program offers compelling upside potential backed by experienced management and proven geological concepts.