IsoEnergy Commences Athabasca Basin Summer 2025 Exploration Program
IsoEnergy Commences Athabasca Basin Summer
2025 Exploration Program
Toronto, ON , June 12 , 202 5 – IsoEnergy Ltd. (“IsoEnergy” or the “Company”) ( NYSE: IS OU; TSX: ISO ) is
pleased to announce the commencement of its summer exploration program across its eastern Athabasca
Basin uranium properties. The program is expected to encompass a total of 24 diamond drill holes for 11,000
metres of drilling on the Larocque East and Hawk projects, following up on encouraging results from the winter
2025 program at Larocque East and winter 2024 program at Hawk . Geochemical results from the winter
program at Larocque East remain pending and are planned to be released once available.
Highlights
• Larocque East Project (Figure 1)
o A total of 20 diamond drill holes totaling 7,600 metres are planned to follow-up up on
encouraging results from the winter 2025 program, targeting both resource expansion and
regional discovery.
o Hurricane Resource Expansion – Drilling will continue to test the potential of the Hurricane
Main and South trends, focusing on step-outs near the existing deposit (the “Deposit”) (Figure
1).
o Greenfield Targets Along the Larocque Trend – Drilling will test Target Area D, 2.8 kilometres
east of the Deposit, where the Company intersected the strongest radioactivity to date
outside of the main mineral resource area. Additional drilling is planned at Target E, where
summer 2024 drilling intersected elevated radioactivity and hydrothermal alteration near the
unconformity and, Target F. Target K, located approximately 800 metres north of the main
Hurricane conductor, identified in a new geophysical interpretation will also be drill tested
along the 2,500 metre trend.
• Hawk Project
o 4 diamond drill holes totaling 3,400 metres are planned to target coincident electromagnetic
conductors and Ambient Noise Tomography (“ANT”) velocity anomalies along a sparsely drill-
tested, 12 -kilometre-long prospective corridor. P revious drilling intersected structural
disruption, alteration, and elevated uranium geochemistry and radiometric responses ,
features consistent with a setting conducive to unconformity -style uranium mineralization
(Figure 3).
• Saskatchewan Forest Fire Situation
o Mobilization for the drill program has been impacted due to severe forest fire activity in
Northern Saskatchewan. The program is initially operating with one drill based out of Points
North. Once conditions improve, specifically when the fires near La Ronge and along Highway
102 subside and safe transport routes are restored, the Larocque East camp is expected to be
opened, and a second drill is planned to be deployed to accelerate the program.
• Advancing Exploration Pipeline Across the Eastern Athabasca Basin
o Additional work is planned this summer to advance a pipeline of exploration targets across
the Company’s earlier- stage projects. This includes a recently completed helicopter -borne
MobileMT survey at the East Rim project, acquisition and processing of satellite hyperspectral
data for the Bulyea River project, and potential prospecting, sampling, and mapping at the
Bulyea River, East Rim and Evergreen projects (Figure 4).
Dan Brisbin, Vice President Exploration, commented, “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. 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. Lastly, we look forward
to returning to the relatively underexplored Hawk project, where planned ground electromagnetic (“EM”) and
ANT surveys will guide drilling later this summer.”
Resource Expansion Drilling at Hurricane
Following the success of the 2025 winter drill program ( see news release dated April 23, 202 5), exploration
drilling has been proposed to further test several target areas (Figure 2).
The Hurricane Main trend, where winter drill holes LE25-194 and 198 intersected strong radioactivity. LE25-
194, located 80 m etres east of Hurricane, returned an average RS-125 spectrometer (“RS-125”) reading on
core of 3,100 counts per second (“ cps”) over 0.5 metres with a corresponding downhole probe maximum
reading of 30,829 cps. LE25-198 intersected up to 625 cps on core and 26,503 cps downhole probe 180 metres
east of Hurricane.
The Hurricane South trend, where winter drill holes LE25-207 and LE25-210 intersected strong radioactivity.
Hole LE25-207, located 240 m east of Hurricane, returned an average RS -125 reading on over 0.5 metres on
core of 8,800 cps and a corresponding downhole probe maximum reading of 30,096 cps, while LE25 -210,
drilled 480 metres east of Hurricane, intersected up to 3,700 cps averaged over 0.5 m on core and a
corresponding downhole probe maximum reading of 20,280 cps.
Regional Targets on the Larocque Trend
Target Area D, 2.8 kilometres east of Hurricane, where winter drill hole LE25-202 intersected an average RS-
125 reading on over 0.5 metres on core of 6,200 cps and up to 28,782 cps downhole probe within that interval
– the highest radioactivity intersected on the project to date outside of the immediate Hurricane area. The
LE25-202 intersection is on the western margin Target Area D at edge of an ANT seismic velocity anomaly
where a new geophysical model generated earlier this year by Computational Geosciences Inc. and
Convolutions Geoscience shows a potential splay in the Hurricane trend EM conductor package.
Target Area E is centred on a 1 kilometre by 2 kilometre ANT anomaly located 8 kilometre east of Hurricane
at the eastern edge of the property where the 2025 conductivity model suggests an east-closing fold of the
Hurricane host graphitic -pyritic pelite basement gneisses have been breached by east -northeast striking
faults. Drill hole LE24-192, drilled in 2024, intersected 2.0 metres at 495 ppm U-p straddling the unconformity
including 0.5 metres at 1,110 ppm U-p immediately below the unconformity. Drill hole LE24-180 returned 462
ppm U-p over 0.5 m. Unconformity depth in that hole was only 175 metres compared to 325 metres at the
Hurricane deposit.
Target Area F , located in the northeast, is centered on the conductor corridor and aligns with roughly
coincident resistivity and ANT velocity anomalies. Disruption of these geophysical patterns at the east end of
Target Area F is inferred to reflect prospective structural complexity.
The new geophysical model generated earlier this year by Computational Geosciences Inc. and Convolutions
Geoscience from joint inversion of historic EM and resistivity survey data highlighted a previously unexplored
2,500 metres long conductive trend 800 metres north of the main Hurricane conductor trend. This is
interpreted as the eastern extension of the Hurricane conductor trend northern splay that originates near drill
hole LE25-202. This target, referred to herein as Target Area K, exhibits two geophysical features like those at
Hurricane: a flexure from a northeast trend to and east trend, and a conductivity decrease on the southwest
end potentially due to the effects of alteration on the conductive host rocks.
The drilling program will be results driven, with drilling being reallocated among these target areas in response
to mineralized intercepts. Drilling planned to begin at the Hawk project in August may also be reallocated to
the Larocque East project if results warrant.
Figure 1– Location of winter 2025 drill holes with respect to the Hurricane resource footprint (blue) and
the ANT seismic low velocity zone in which the Deposit occurs, and projected Hurricane mineralization-
controlling fault zones. RS-125 values are highest averages over 0.5 metre intervals.
Figure 2 – Compilation map of Larocque East project showing the Hurricane deposit, winter 2025 and
summer 2024 drill hole locations and ANT seismic velocity anomalies (A though J) on a plan view of the 2025
conductivity model 50 metres below the unconformity. 20 drill holes planned for the summer will test
targets at Hurricane, in target areas D, E and F, and at the untested northern conductive trend (Target K)
Hawk Project
Winter 2024 drill holes at the Hawk project intersected structure, alteration, and broad zones of elevated
radioactivity typical of unconformity-related uranium deposits (see news release dated April 25, 2024). These
holes were drilled to test EM conductors along a regional high conductivity trend mapped by Z -Axis Tipper
Electromagnetic (“ZTEM”) surveys and within a prominent ANT seismic velocity low interpreted to be due to
structural disruption and alteration. The holes were drilled along trend to the north of 2023 drill holes HK23-
03 and HK23-05A (Figure 3) that intersected structural disruption, desilicification, clay alteration, and “grey”
zone sulphide mineralization with anomalous radioactivity and U- p geochemistry at the unconformity . 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. HK23-08, which intersected the unconformity about 90 metres
to the east, intersected 27 ppm U-p over 5.0 metres in the basal sandstone, including 99 ppm U-p over 0.5 m.
Exploration work planned for summer 2025 includes:
o Stepwise moving loop EM surveying to more accurately locate conductors than the existing
fixed loop EM surveys do. It is anticipated that this will improve drill hole targeting.
o ANT surveys over the northern portion of the project to test for the extension of the existing
ANT velocity anomaly along the conductivity corridor in an area where there is 35 metres of
unconformity elevation change between 2023 drill holes HK23-01 and HK23-02.
o Drill up to 3,400 metres in four holes to test targets along the Hawk conductivity corridor that
will be finalized upon completion of the ground geophysical surveys.
Figure 3 – Hawk project map showing the locations of the planned summer 2025 geophysical surveys. The
locations of four drill holes planned for late in the summer will be finalized after interpretation of the
geophysical survey results. Locations of past drill holes, interpreted ground EM conductors, and drill
intersected faults are shown on a colour ZTEM conductivity map.
Developing Drill Targets on Additional Highly Ranked Projects
Additional work is being planned for the summer of 2025 to develop a pipeline of exploration targets on the
Company’s earlier stage projects . An airborne MobileMT conductivity and magnetic survey was recently
completed over the East Rim project. Data processing and interpretation are in progress.
Acquisition of satellite hyperspectral survey data for the Bulyea River project is planned for June . This data
will be used for remote mineral mapping to help guide initial geological mapping, prospecting and sampling
planned for late summer to follow up on historic highly anomalous uranium lake sediment geochemistry and
radiometric anomalies detected by both historic and 2024 surveys completed for IsoEnergy by RAMP
Geological Services Inc.
Figure 4 – Location map of the Hurricane deposit and exploration projects in the eastern Athabasca Basin
showing planned summer exploration work.
Qualified Person Statement
The scientific and technical information contained in this news release was reviewed and approved by Dr. Dan
Brisbin, P.Geo., IsoEnergy’s Vice President, Exploration, who is a “Qualified Person” (as defined in NI 43 -101
– Standards of Disclosure for Mineral Projects ). See the press releases referred to above for additional
information, including data verification and quality assurance/quality control procedures, as well as the
complete exploration results from the previous programs disclosed herein.
For additional information regarding the Company’s Larocque East Project, including the current mineral
resource estimate for IsoEnergy’s Hurricane Deposit, please see the technical report entitled “Technical
Report on the Larocque East Project, Northern Saskatchewan, Canada” dated August 4, 2022, available on the
Company’s profile at www.sedarplus.ca
About IsoEnergy Ltd.
IsoEnergy (NYSE American: ISOU and 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, providing near -, medium- and long-term leverage to rising
uranium prices. IsoEnergy is currently advancing its Larocque East project in Canada’s Athabasca basin, which
is home to the Hurricane deposit, boasting 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. These mines are currently on standby, ready
for rapid restart as market conditions permit, positioning IsoEnergy as a near-term uranium producer.
For More Information, Please Contact:
Philip Williams
CEO and Director
1-833-572-2333
X: @IsoEnergyLtd
www.isoenergy.ca
Cautionary Statement Regarding Forward-Looking Information
This press release contains “forward- looking information” within the meaning of applicable Canadian
securities legislation and “forward-looking statements” within the meaning of U.S. securities laws (collectively,
“forward-looking statements”). Generally, forward-looking statements can be identified by the use of forward-
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“estimates”, “forecasts”, “intends”, “anticipates” or “does not anticipate”, or “believes”, or variations of such
words and phrases or state that certain actions, events or results “may”, “could”, “would”, “might” or “will be
taken”, “occur” or “be achieved”. These forward-looking statements may relate to the Company’s properties,
planned exploration activities for summer 2025 and the anticipated results thereof ; and any other activities,
events or developments that the Company expects or anticipates will or may occur in the future.
Forward-looking statements are necessarily based upon a number of assumptions that, while considered
reasonable by management at the time, are inherently subject to business, market and economic risks,
uncertainties and contingencies that may cause actual results, performance or achievements to be materially
different from those expressed or implied by forward- looking statements. Such assumptions include, but are
not limited to, assumptions that the results of planned exploration activities are as anticipat ed and will be
reported when anticipated; the anticipated mineralization of IsoEnergy’s projects being consistent with
expectations; the price of uranium; the anticipated cost of planned exploration activities; that general business
and economic conditions will not change in a materially adverse manner; that financing will be available if and
when needed and on reasonable terms; and that third party contractors, equipment and supplies and
governmental and other approvals required to conduct the Company’s pl anned activities will be available on
reasonable terms and in a timely manner. Although IsoEnergy has attempted to identify important factors that
could cause actual results to differ materially from those contained in forward-looking statements, there may
be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance
that such statements will prove to be accurate, as actual results and future events could differ materially from
those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking
statements.
Such statements represent the current views of IsoEnergy with respect to future events and are necessarily
based upon a number of assumptions and estimates that, while considered reasonable by IsoEnergy, are
inherently subject to significant business, economic, competitive, political and social risks, contingencies and
uncertainties. Risks and uncertainties include, but are not limited to the following: negative operating cash
flow and dependence on third party financing; uncertainty of additional financing; no known mineral reserves;
aboriginal title and consultation issues; reliance on key management and other personnel; actual results of
technical work programs and technical and economic assessments being different than anticipated; changes
in development and production plans based upon results; availability of third party contractors; availability of
equipment and supplies; failure of equipment to operate as anticipated; accidents, effects of weather and
other natural phenomena; other environmental risks; changes in laws and regulations; regulatory
determinations and delays; stock market conditions generally; demand, supply and pricing for uranium; other
risks associated with the mineral exploration industry; and general economic and political conditions i n
Canada, the United States and other jurisdictions where the Company conducts business. Other factors which
could materially affect such forward- looking statements are described in the risk factors in IsoEnergy’s most
recent annual management’s discussion and analysis and annual information form and IsoEnergy’s other
filings with securities regulators which are available under the Company’s profile on SEDAR+ at
www.sedarplus.ca and on EDGAR at www.sec.gov. IsoEnergy doe s not undertake to update any forward-
looking statements, except in accordance with applicable securities laws.