Encouraging Uranium Discovery at IsoEnergy & Purepoint's Dorado Joint Venture Project

• IsoEnergy and Purepoint Uranium have intersected uranium mineralization in two initial drill holes at their 50/50 Dorado joint venture project in Saskatchewan's Athabasca Basin, with downhole gamma probe readings reaching up to 79,800 counts per second.
• The mineralization occurs within strongly altered basement rocks at the Q48 target, suggesting an active uranium-bearing hydrothermal system consistent with known Athabasca-style deposits.
• Drill holes PG25-04 and PG25-05 intersected a steeply dipping, north-south trending mineralized structure at vertical depths of 60 and 20 metres below the unconformity, respectively.
• The companies plan approximately 5,400 metres of drilling across 18 holes at the project in 2025, with a third follow-up hole already underway to track the mineralized structure along the Q48 conductive corridor.
• The Dorado project encompasses more than 98,000 hectares of prime uranium exploration ground with shallow unconformity depths typically between 30 and 300 metres, allowing for highly efficient drilling operations.

IsoEnergy Ltd. (TSX:ISO) is a leading, globally diversified uranium company with substantial mineral resources across top uranium mining jurisdictions including Canada, the U.S., and Australia. The company is currently advancing its Larocque East project in Canada's Athabasca Basin, home to the Hurricane deposit which boasts the world's highest-grade indicated uranium mineral resource. Additionally, IsoEnergy holds a portfolio of permitted past-producing uranium and vanadium mines in Utah, positioning the company as a potential near-term uranium producer.

Purepoint Uranium Group (TSXV:PTU) operates as a focused explorer with advanced projects within the Athabasca Basin, maintaining partnerships with industry leaders including Cameco Corporation, Orano Canada Inc., and IsoEnergy Ltd.

For investors evaluating IsoEnergy and Purepoint Uranium, this uranium discovery at the Dorado project represents a significant validation of their joint exploration strategy in one of the world's premier uranium districts. The combination of high-grade mineralization, proven geological systems, and extensive land holdings provides multiple pathways for resource expansion and value creation in the uranium sector.

Drilling Results Confirm Uranium Discovery

The inaugural drill program at the Dorado project has delivered highly encouraging results, with two drill holes successfully intersecting uranium mineralization at the Q48 target located in the southern portion of the project. The discovery validates the systematic exploration approach employed by the joint venture partners.

Drill hole PG25-04 recorded radioactivity readings averaging 11,050 counts per second over 3.7 metres with a maximum reading of 74,800 cps. The second hole, PG25-05, delivered even stronger results with readings averaging 27,750 cps over 2.3 metres and reaching a maximum of 79,800 cps. These measurements were obtained using a Mount Sopris 2PGA-1000 downhole total gamma probe, with results selected using a cutoff of 500 cps over a 0.5 metre width.

The mineralization is hosted within strongly clay-altered basement rocks, which represent key indicators of uranium-bearing hydrothermal systems characteristic of Athabasca-style deposits. This geological signature is particularly significant as it suggests the presence of an active uranium system with potential for additional discoveries.

Project Scale & Infrastructure Advantages

The Dorado project represents the flagship asset of the IsoEnergy-Purepoint joint venture, encompassing more than 98,000 hectares of prime uranium exploration ground. The project consolidates the former Turnor Lake, Geiger, Edge, and Full Moon properties, all underlain by graphite-bearing lithologies and fault structures favorable for uranium deposition.

A significant operational advantage of the Dorado property is the shallow unconformity depths, typically ranging between 30 and 300 metres across the project area. This geological characteristic allows for highly efficient drilling operations and enables rapid follow-up on promising results, reducing both time and costs associated with exploration activities.

Recent drilling by IsoEnergy east of the Hurricane Deposit has intersected strongly elevated radioactivity in multiple holes, confirming the continuity of the fertile graphitic rock package and highlighting the opportunity for additional high-grade discoveries across the broader region.

Management Commentary on Discovery Success

Chris Frostad, President and CEO of Purepoint, expressed satisfaction with the drilling results:

"This is exactly the kind of start we were aiming for. These early results suggest we're on the trail of something meaningful. These initial hits speak to the quality of the target and the systematic approach our team is taking to uncover its potential. We're moving quickly to follow up on these encouraging results as drilling continues."

Philip Williams, CEO and Director of IsoEnergy, emphasized the strategic value of the partnership:

"Our JV projects was created to focus exploration where we see real discovery potential. This exploration success reinforces the strength of our partnership with Purepoint. By combining deep basin experience with a focused, well-funded program, we believe we've positioned Dorado for continued success through a disciplined exploration effort. It's exciting to see that approach already delivering promising results."

Q48 Target Area: Geological Significance & Exploration History

The Q48 zone lies within the southern portion of the Dorado project and is characterized by a steeply dipping, north-south trending conductive package identified through geophysical surveys. This target was originally highlighted as high-priority based on historic drilling that encountered structurally disrupted, altered basement rocks with weak radioactivity.

The geological significance of the Q48 target was further confirmed in 2022 when IsoEnergy's exploration identified brittle faults, shearing, and alteration along the conductive trend. These characteristics are fundamental indicators of uranium-bearing hydrothermal systems in the Athabasca Basin, making Q48 a highly prospective but previously underexplored target.

Historic drilling in the area had intersected strongly altered and structurally disrupted rocks at the unconformity and in the basement, including garnetiferous pelitic gneiss, graphitic pelitic gneiss, and semipelite, with local weak radioactivity and zones of intense clay alteration. The current drilling program is designed to systematically follow up and fully test the Q48 conductive corridor.

Detailed Drill Hole Analysis

Drill hole PG25-04 targeted the Q48 conductor approximately 800 metres northwest of IsoEnergy's 2022 drilling location. The hole was collared with a dip of -60 degrees and encountered Athabasca sandstone to a depth of 321 metres, followed by clay-altered granitic gneiss and pegmatites to 393 metres, then garnet-rich pelitic gneiss with local pyrite and graphite to the completion depth of 489 metres.

The radioactive mineralization in PG25-04 was found in reddish-brown altered radioactive gouge seams hosted by a chloritized pegmatite, returning an average of 64,220 cps over 0.4 metres. This intersection occurs at a vertical depth of 60 metres below the unconformity, demonstrating the shallow nature of the mineralization.

Hole PG25-05 was positioned approximately 40 metres up-dip from PG25-04 and intercepted the radioactive structure at an even shallower depth of 20 metres below the unconformity. This hole encountered similar geological sequences, with the central mineralized structure hosted in sheared and brecciated reddish-brown altered granitic gneiss, returning an average of 75,660 cps over 0.4 metres.

2025 Exploration Program & Future Developments

The companies have outlined an ambitious exploration program for 2025, planning approximately 5,400 metres of drilling across 18 holes at the Dorado project. A third follow-up hole is already underway to further track the mineralized structure along the Q48 conductive corridor to the northeast, demonstrating the commitment to systematic exploration of this promising target.

The systematic approach focuses on testing the full extent of the Q48 conductive corridor, with the potential to define additional mineralized zones and expand the overall resource potential of the project. The shallow nature of the mineralization and the presence of strong geological indicators suggest favorable conditions for discovering additional uranium occurrences within the broader project area.

The success of the initial drilling program validates the exploration strategy and provides a strong foundation for continued exploration activities throughout 2025, positioning both companies to capitalize on potential discoveries in one of the world's most prolific uranium districts.