IsoEnergy Commences 2025 U.S. Exploration Program
IsoEnergy Commences 2025 U.S. Exploration Program
Toronto, ON, September 17, 2025 – IsoEnergy Ltd. (“IsoEnergy” or the “Company”) (NYSE American: ISOU;
TSX: ISO) is pleased to announce the launch of its 2025 U.S. exploration program , focused on advancing its
uranium projects in southeast Utah. The program will begin with completion of ten surface rotary holes
with core tails , totaling 15,000 feet on the Flatiron claims, located in the Henry Mountains uranium
district, approximately seven miles northwest of the Company’s past-producing Tony M uranium mine
(Figure 1). This initial drill program is designed to follow -up on historic al, regional exploration conducted
by Plateau Resource s in the early 1980s and represents Iso Energy’s first phase of testing at Flatiron . In
addition to drilling at Flatiron, IsoEnergy will continue fieldwork at its Daneros and Sage Plain projects (Figure
2). This work is aimed at better defining the sedimentary framework that controls mineralization at both
regional and mine scale s. This geological work is expected to guide future exploration.
Philip Williams, CEO and Director of IsoEnergy , commented, “Commencing these exploration programs
in Utah marks an exciting new chapter for IsoEnergy in the United States. While advancing our past -
producing mines toward production remains a top priority, our geological team has also identified
compelling new explor ation targets that we believe are ready to be tested. Drilling will begin shortly at
the Flatiron p roject, a large claim package in the Henry Mountains —one of Utah’s most historically
productive uranium districts —situated directly on trend with known depos its. This program will be the
first to evaluate high -potential targets defined by historic work but never followed up on due to
unfavourable market conditions. Alongside our ongoing fieldwork at Daneros and Sage Plain, we believe
we are building a strong foundation for future growth in the U.S. The call for secure domestic uranium
supply is only intensifying, as reflected in recent discussions about expanding the U.S. Strategic Uranium
Reserve, and we believe IsoEnergy is well positioned to play a meaningful role as both a near- and long -
term domestic supplier.”
IsoEnergy staked the 370 lode claims that comprise the Flatiron project in 2024 , later adding two Utah
state leases to bring the total land position to 8,800 total acres. The Flatiron project is one of the largest
contiguous land positions in the historically productive Henry Mountain District, where a pproximately
1.4 million lbs of U 3O8 has been produced from the district to date1.
Strategically located along the projection of the trends of uranium mineralization from IsoEnergy’s Tony
M and Bullfrog (Energy Fuels Inc.) (NYSE American: UUUU; TSX: EFR) deposits, the Flatiron project
benefits from a proven geological setting. Plateau Resources, the original developers of these deposits,
previously conducted wide-s paced, district-s cale drilling to identify uranium mineralization
concealed beneath surface cover. These historic holes were drilled on centers of more than one-m ile,
with two of the highest-priority results located within the current Flatiron claims. Before Plateau
Resources could advance these targets, depressed uranium prices in the 1980s forced the closure of
regional mines. IsoEnergy’s upcoming drill program will be the first to follow up on this work, positioning
the Company to unlock growth potential in the Henry Mountain District.
1 Mills, S.E. and Jordan, B., 2021, Uranium and vanadium resources of Utah—an update in the era of critical
minerals and carbon neutrality: Utah Geological Survey Open-File Report 735, 26 p., 1 appendix,
https://doi.org/10.34191/OFR-735.
Figure 1: Location of the Flatiron Project in proximity to IsoEnergy’s Tony M Mine in Utah 2,3
2 See Qualified Person Statement Below.
3 As reported in the Technical Report on the Bullfrog Project, Garfield County, Utah, USA Report prepared
in accordance with NI 43 -101 for Energy Fuels Inc. by SLR International Corporation; Mark B. Mathisen,
Qualified Person, Effective Date December 31, 202 4.
The target unit for the Flatron drilling is the lowest sandstone unit of the Salt Wash Member of the
Morrison Formation. This is the primary host unit across the Henry Mountain district. This distinct
sandstone package contains a suitable amount of reductant material and the hydrogeologic setting for
uranium mineralization of commercially viable grade. Low grades of vanadium are also expected to be
encountered in the host unit.
IsoEnergy’s 2025 Utah exploration campaign will also focus on the continuing field work being conducted
at the Daneros and Sage Plain properties. Like Tony M, both properties are past producers and have
been on standby and ready for strategic restart. Iso Energy has been focused on detailed field work
designed to reveal the sedimentary framework that controls the local mineralization. This work includes
mapping the extent of the prospective host units, and numerous detailed measured sections of the
available outcrop used to identify modern analogs of the distr ibutary channel system s to provide a
conceptual target generation framework . This information is expected to guide future exploration,
including determining the most appropriate geophysical survey techniques to locat e the productive
units without the need for expensive and pervasive surface drilling.
Figure 2: Location of IsoEnergy exploration projects and past-producing mines in southeastern Utah. The
Flatiron project is seven miles northwest of the Tony M mine (Figure 1)
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).
For additional information with respect to the current mineral resource estimate for IsoEnergy’s Tony M
Deposit, please refer to the Technical Report prepared in accordance with NI 43 -101 entitled “Technical
Report on the Tony M Project, Utah, USA ” dated September 9 , 2022. This news release refers to
properties other than those in which IsoEnergy ha s an interest and the QPs have been unable to verify
that information. Mineralization on those other properties is not necessarily indicative of mineralization
on the Joint Venture properties.
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-
looking terminology such as “plans”, “expects” or “does not expect”, “is expected”, “budget”, “scheduled”,
“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 planned
exploration activities for summer 2025 and the anticipated results thereof ; expectations with respect to any
potential restart decision with respect to the Company’s US projects ; expectations regarding the Company’s
enhanced U.S. market presence; potential changes in US nuclear policy; the Company’s potential role in the in
the US market; 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 anticipated; the anticipated
mineralization of IsoEnergy’s projects being consistent with expectations; the price of uranium; ; assumptions
regarding uranium market conditions and policy shifts; 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 planned 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 a 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 in 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 does not undertake to update any forward-looking statements, except in accordance
with applicable securities laws.