IsoEnergy and Purepoint Intersect up to 8.1% U3O8 at Dorado Project
IsoEnergy and Purepoint Intersect up to 8.1%
U3O8 at Dorado Project
Toronto, Ontario--(Newsfile Corp. - September 18, 2025) - IsoEnergy Ltd. (NYSE American: ISOU) (TSX:
ISO) ("IsoEnergy") and Purepoint Uranium Group Inc. (TSXV: PTU) (OTCQB: PTUUF) ("Purepoint")
today announced the receipt of partial assay results from the summer drill program at the companies' 50/50
joint venture Dorado Project (the "Dorado Project"), located on the southeastern margin of Saskatchewan's
Athabasca Basin. The highlight comes from drill hole PG25-07A, which returned 2.1 metres grading 1.6%
U ₃ O ₈ , including 0.4 metres at 8.1% U ₃ O ₈ and an additional 4.9 metres at 0.52% U ₃ O ₈ representing the most
significant assay intervals reported to date from the Nova discovery zone (see Table 1 below).
"Eight percent uranium is an excellent grade from the centre of the very strong radioactive interval drilled by
hole 7A," said Chris Frostad, President and CEO of Purepoint Uranium. "These assays reinforce the strength
of this newly discovered system and provide a solid anchor point as we continue to test the mineralized
structure in all directions."
Highlights:
Drill hole PG25-07A intersected 0.4 metres at 8.1% U ₃ O ₈ from within 2.1 metres of 1.6% U ₃ O ₈ at the
Nova discovery zone. The hole also returned an additional 4.9 metres at 0.52% U ₃ O ₈ , that included 0.4
metres at 2.9% U ₃ O ₈ .
Select samples from PG25-07A were fast-tracked for assay to confirm uranium grades and mineral
composition. Full assays from all holes remain pending.
A total of 5,030 metres were completed across 11 holes before wildfires curtailed the planned 5,400-
metre summer drill program.
Additional drilling at Serin and Turaco targets, within the Dorado Project, has provided valuable data for
calibration of the project's geophysics.
Celeste project drill program deferred due to ongoing wildfire risks across northern Saskatchewan.
Follow-up programs planned for early 2026 pending final assays and geologic/geophysical
interpretation.
Despite having time and budget remaining, the program was cut short due to regional wildfires that limited
helicopter access and created hazardous field conditions. As a result, drilling at the nearby Celeste project,
also a Purepoint-IsoEnergy joint venture, has been deferred to a future program.
Table 1: Assay Results of Nova Discovery Drill Holes Received to Date
Hole ID From (m) To (m) Length % U3O8
PG25-07A 384.3 386.4 2.1 1.62
Includes 386.0 386.4 0.4 8.13
391.8 396.7 4.9 0.52
Includes 392.6 392.9 0.3 2.47
Includes 394.5 394.9 0.4 2.92
399.4 399.7 0.3 0.24
402.2 402.8 0.6 0.25
Previously Reported Assays
PG25-04 386.3 386.9 0.6 0.96
409.1 409.5 0.4 0.15
PG25-05 328.9 329.9 1.0 2.19
Includes 329.2 329.5 0.3 5.38
399.3 399.6 0.3 0.10
Turaco Grid Drilling
Two holes (TUR25-01 and TUR25-02) totaling 832 metres were completed at the Turaco Grid, targeting two
parallel, newly reinterpreted airborne electromagnetic (EM) conductors within Zone 3. Neither hole
encountered anomalous radioactivity, but both the results will help calibrate the Dorado Project's updated
geophysical model. The highest radioactivity returned from the downhole probe was 578 CPS.
Serin Grid Drilling
Two holes (SL25-10 and SL25-11) were drilled at the Serin Grid, totaling 1,032 metres. While uranium
mineralization was not encountered in SL25-10, anomalous radioactivity was hosted by a 6-metre-wide
chloritized pegmatite in SL25-11 and returned up to 1,200 CPS from the downhole gamma probe. The drill
hole results provide valuable insights into the basement geology and structural context that will guide future
targeting.
Next Steps
Purepoint and IsoEnergy are now awaiting the full suite of geochemical assays and structural interpretations
for the 2025 drill program. The results will support detailed planning for follow-up drilling in 2026, focused on
expanding Nova and testing priority corridors across the broader Dorado Project property.
Figure 1: Location of the Q48 Nova Discovery, Q2, Turaco & Serin Target areas, the initial focus of the
2025 drill program, highlighted
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* See Qualified Person Statement below.
Figure 2: Location Map of 2025 Drill Program at Q48 Target Area and the new Nova Discovery
To view an enhanced version of this graphic, please visit:
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Figure 3: Vertical Longitudinal Section of the Nova Discovery
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About the Dorado JV Project
The Dorado Project (Figure 3) is the flagship project of the IsoEnergy-Purepoint 50/50 joint venture, a
partnership encompassing more than 98,000 hectares of prime uranium exploration ground. The Dorado
Project includes the former Turnor Lake, Geiger, Edge, and Full Moon properties, all underlain by graphite-
bearing lithologies and fault structures favorable for uranium deposition.
Recent drilling by IsoEnergy east of the Hurricane Deposit has intersected strongly elevated radioactivity in
multiple holes. The anomalous radioactivity confirms the continuity of fertile graphitic rock package and further
highlights the opportunity for additional high-grade discoveries across the region.
The shallow unconformity depths across the Dorado Project property—typically between 30 and 300 metres—
allow for highly efficient drilling and rapid follow-up on results.
Figure 4: IsoEnergy and Purepoint Uranium Joint Venture including, Dorado Project, Aurora Project
and Celeste Block
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* See Qualified Person Statement below.
Gamma Logging and Geochemical Assaying
A Mount Sopris 2PGA-1000 downhole total gamma probe was utilized for radiometric surveying. All drill
intercepts are core width and true thickness is yet to be determined.
Core samples are submitted to the Saskatchewan Research Council ("SRC") Geoanalytical Laboratories in
Saskatoon. The SRC facility is independent of IsoEnergy and Purepoint and is ISO/IEC 17025:2005
accredited by the Standards Council of Canada (scope of accreditation #537). The samples are analyzed for a
multi-element suite, including uranium, using partial and total digestion and inductively coupled plasma (ICP)
mass spectroscopy (MS) and optical emission spectroscopy (OES) methods. Boron sample analysis includes
by fusion in a Na2O2/NaCO3 flux. followed by solution in deionized water and analysis by ICP-OES. The
U3O8% values reported here are derived from uranium-total (Ut) results measured by total digestion
preparation followed by ICP-OES analysis. The Ut results are reported by SRC in parts per million (ppm) and
are converted to U3O8% by multiplying by 1.17924 and dividing by 10,000.
The basement rock drill core is NQ in size and samples are created in the field by spitting the core in half.
Field duplicate samples are also created in the field by spitting every 30th sample of remaining core; one
quarter is sent to the laboratory and one quarter of the core remains in the core box. Data verification includes
internal SRC laboratory quality assurance and quality control (QA/QC), blanks, comparison of results of the
duplicate samples and variance of standard samples.
References
Alonso, D., Dalidowicz, F., Mondy, J., 1991: Henday Lake Project 1991 Winter Activities and Results, Cogema
Canada Limited. Saskatchewan Mineral Assessment File Number 74I-0053.
Cutts, C. and Lesiczka, M., 2007: Henday Lake Project 2007 Activities and Results, Areva Resources Canada
Inc. Saskatchewan Mineral Assessment File Number 74I08-0071.
Donmez, S., 2013: Hatchet Lake Project, Richardson Lake Area, Winter 2013 Diamond Drilling Program,
Denison Mines Corp. Saskatchewan Mineral Assessment File Number MAW00308
Goulet, D., Pascal, M., and Donmez, S., 2015: Murphy Lake Diamond Drilling Program and Slingram Moving
Loop Surface Transient Electromagnetic Survey, Denison Mines Corp., Saskatchewan Mineral Assessment
File Number MAW01724
Munholland, P. and Bingham, D., 1999: Henday Lake Project 1999 Activities and Results, Cogema Resources
Inc. Saskatchewan Mineral Assessment File Number 74I09-0062.
Qualified Person Statement
The scientific and technical information contained in this news release relating to IsoEnergy and Purepoint
was reviewed and approved by Dr. Dan Brisbin, P.Geo., IsoEnergy's Vice President, Exploration and Scott
Frostad BSc, MASc, P.Geo., Purepoint's Vice President, Exploration, who are "Qualified Persons" (as defined
in NI 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101")).
For additional information with respect to the current mineral resource estimate for IsoEnergy's Hurricane
Deposit, please refer to the Technical Report prepared in accordance with NI 43-101 entitled "Technical
Report on the Larocque East Project, Northern Saskatchewan, Canada" dated August 4, 2022, available
under IsoEnergy's profile at www.sedarplus.ca.
This news release refers to properties other than those in which IsoEnergy and Purepoint have an interest.
Mineralization on those other properties is not necessarily indicative of mineralization on the Joint Venture
properties.
About IsoEnergy Ltd.
IsoEnergy (NYSE American: ISOU) (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.
About Purepoint
Purepoint Uranium Group Inc. (TSXV: PTU) (OTCQB: PTUUF) is a focused explorer with a dynamic portfolio
of advanced projects within the renowned Athabasca Basin in Canada. Highly prospective uranium projects
are actively operated on behalf of partnerships with industry leaders including Cameco Corporation, Orano
Canada Inc. and IsoEnergy Ltd.
Additionally, the Company holds a promising VMS project currently optioned to and strategically positioned
adjacent to and on trend with Foran Mining Corporation's McIlvenna Bay project. Through a robust and
proactive exploration strategy, Purepoint is solidifying its position as a leading explorer in one of the globe's
most significant uranium districts.
For more information, please contact:
IsoEnergy Ltd.
Philip Williams, CEO and Director
(833) 572-2333
www.isoenergy.ca
Purepoint Uranium Group Inc.
Chris Frostad, President & CEO
Phone: (416) 603-8368
Email: [email protected]
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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, that planned exploration activities are completed as anticipated; the anticipated costs of planned
exploration activities, the price of uranium; that general business and economic conditions will not change in a
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Although each of IsoEnergy and Purepoint have attempted to identify important factors that could cause
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IsoEnergy and Purepoint, 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: the inability of the Joint Venture to complete the exploration activities as currently contemplated; ;
uncertainty of additional financing; no known mineral resources or 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; regulatory determinations and delays;
stock market conditions generally; demand, supply and pricing for uranium; and general economic and
political conditions. Other factors which could materially affect such forward-looking information are described
in the risk factors in each of IsoEnergy's and Purepoint's most recent annual management's discussion and
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securities regulators which are available, respectively, on each company's profile on SEDAR+ at
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except in accordance with applicable securities laws.
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