IsoEnergy Begins 8,000 Metre Summer Drill Program Targeting Hurricane South Trend at Larocque East

• IsoEnergy has commenced its 2026 summer exploration program at the Larocque East Project, comprising approximately 8,000 metres of diamond drilling across up to 20 drill holes focused on the Hurricane South Trend.
• The program follows encouraging winter 2026 results, including a 4.21% uranium oxide concentrate intercept over 3.5 metres, located approximately 525 metres east of the current Hurricane resource envelope along the South Trend.
• Summer drilling will test eastern extensions of the newly identified mineralised corridor and evaluate additional fault zones that previously returned high-grade uranium intersections, including a 2021 intercept of 20.4% uranium oxide concentrate over 6.5 metres.
• The Hurricane deposit currently hosts a Mineral Resource of 48.6 million pounds of uranium oxide concentrate at an Indicated grade of 34.5% and 2.7 million pounds at an Inferred grade of 2.2%, according to the 2022 technical report.
• Beyond Larocque East, IsoEnergy is advancing target generation across its eastern Athabasca Basin portfolio through airborne geophysical surveys, prospecting and geological fieldwork on multiple early-stage projects during the 2026 field season.

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.

Summer Drill Program Overview

IsoEnergy Ltd. has commenced its 2026 summer exploration program at the Larocque East Project, which hosts the high-grade Hurricane deposit in the eastern Athabasca Basin, Canada. The program comprises approximately 8,000 metres of diamond drilling across up to 20 drill holes targeting the Hurricane South Trend and following up on high-grade winter 2026 results.

The Hurricane deposit hosts a Mineral Resource of 48.6 million pounds of uranium oxide concentrate at a grade of 34.5% Indicated, and 2.7 million pounds at a grade of 2.2% Inferred, as set out in the Technical Report on the Larocque East Project dated August 4, 2022. The Project is located approximately 40 kilometres northwest of the Cameco and Orano McClean Lake mill, with mineralisation occurring at a depth of approximately 325 metres. The deposit sits on the Larocque Trend, a regional structure that also hosts high-grade occurrences on the Cameco and Orano Dawn Lake joint venture.

Hurricane South Trend Results & Targets

Winter 2026 drilling tested the South Trend in the lower-grade portion of the deposit and along strike to the east, building on prior drilling that intersected mineralisation near the unconformity. Recently received assay results confirmed high-grade mineralisation within a newly reinterpreted fault zone, including an intercept of 4.21% uranium oxide concentrate over 3.5 metres, with additional intercepts of 2.75% uranium oxide concentrate over 0.5 metres and 1.75% uranium oxide concentrate over 0.5 metres, located approximately 525 metres east of the current resource envelope along the South Trend.

Summer 2026 drilling is targeting extensions of this mineralisation along strike to the east, testing structures that the company states have previously intersected high-grade mineralisation along a fault corridor on the South Trend. The program is also targeting high-grade mineralisation comparable to a historical 2021 intercept of 20.4% uranium oxide concentrate over 6.5 metres, along a separate fault zone within the broader South Trend, east of the deposit.

Vice President of Exploration at IsoEnergy Ltd., Dan Brisbin, commented on the program's rationale: 

"Following the high-grade results returned from the winter program along the Hurricane South Trend, our team has mobilised for an aggressive summer follow-up. The winter intersection opened an underexplored corridor along the southernmost fault strands of the Hurricane fault zone, and this 8,000 m program is designed to test the scale of that opportunity along strike, and to test additional targets within the broader Hurricane South Trend."

Eastern Athabasca Target Development

In addition to Larocque East, IsoEnergy holds 14 early-stage projects in the eastern Athabasca Basin, where the Company is developing a pipeline of drill targets. Summer 2026 work is targeting 4 of these early-stage projects, as well as the western portion of Larocque East. Airborne geophysical surveys are targeted for 3 of these projects and the western Larocque East area, complementing surveys previously completed on 2 other projects, intended to support interpretation of structural geology, alteration and basement rock types. Prospecting and geological fieldwork are targeted for 2 projects in late summer 2026 to investigate radiometric anomalies identified by helicopter-borne radiometric surveys completed in 2024.

Next Steps

The 2026 summer drill program at Larocque East is underway, targeting approximately 8,000 metres of diamond drilling across up to 20 holes along the Hurricane South Trend. Airborne geophysical surveys and ground field work are also planned across four early-stage Athabasca Basin projects and the western portion of Larocque East, with results expected to support the company's regional exploration pipeline. Key upcoming catalysts include assay results from the summer drilling campaign and potential updates to the Larocque East Technical Report.

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