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IsoEnergy Begins Drilling Program to Extend High Grade Uranium at the Geiger Property

Exploration Programs

IsoEnergy Begins Drilling Program to Extend High Grade Uranium at

the Geiger Property

Vancouver, BC, January 25, 2018 – IsoEnergy Ltd. (“ IsoEnergy ” or the “ Company ”) ( TSXV: ISO; OTCQX: ISENF )

is pleased to announce that it has begun a program of core drilling targeting basement-hosted mineralization

at its 100% owned Geiger uranium property (the “ Property ”) in the Eastern Athabasca Basin of Saskatchewan.

The Property

The Geiger property is located 13 kilometres northw est of IsoEnergy’s Radio property near several uran ium

deposits, mines and mills. The Roughrider and Midwest deposits are both within 20 kilometres of the Property,

as is AREVA’S McClean Lake uranium mine and mill. Figure 1 shows the location of the Geiger claims relative

to Radio, nearby uranium deposits and supporting infrastructure in the area.

Geiger is adjacent to the Wollaston-Mudjatik transition zone, a major crustal-scale structural zone related to

most of the major uranium deposits in the eastern A thabasca Basin. Sandstone cover at the Property is thin

and ranges between 101 metres and 358 metres. High grade basement hosted uranium mineralization is

present on the Property and it is the focus of IsoEnergy’s exploration efforts. Drill hole HL-50 intersected 2.74%

U3O8 over 1.2 metres in the basement on the H11 South conductor. Follow-up efforts were focused primarily

on locating mineralization at the sub-Athabasca unc onformity. Consequently, opportunities for additio nal

basement hosted mineralization proximal to HL-50 are considered excellent. Additionally, drill hole HL-76 was

completed 1.6 kilometres along strike to the northe ast along the same conductor as HL-50 and intersect ed

0.65% U 3O8 over 0.1 metres. Mineralization in HL-76 is locat ed in the basement and is part of a broader 27

meter thick zone of strong alteration and elevated geochemistry.

The Program

A program of 2,800 metres of core drilling is planned in 8 drill holes. There are two target areas which surround

the mineralization observed in drill holes HL-50 and HL-76, described above. The drilling areas are shown on

the map in Figure 2. The objective of the program is to evaluate both areas for extensions of previously drilled,

basement hosted mineralization. The results will be used to determine the orientation and morphology of the

mineralization and alteration, allowing the Company’s technical team to vector into the core of the systems.

Drilling operations are expected to be complete by the end of February, 2018.

Corporate Update

On January 8, 2018, the Company granted an aggregat e of 440,000 stock options to employees, consultant s

and directors, each having an exercise price of $0. 57, a term of five years and vesting in three annua l

instalments commencing on January 8, 2018.

Figure 1 – Geiger Project Location Map.

Figure 2 – January 2018 Drilling Target Areas.

Qualified Person Statement

The scientific and technical information contained in this news release was prepared by Steve Blower, P.Geo.,

IsoEnergy’s Vice President, Exploration, who is a “qualified person” (as defined in National Instrument 43-101

– Standards of Disclosure for Mineral Projects ). Mr. Blower has verified the data disclosed. This news release

refers to properties other than those in which the Company has an interest. Mineralization on those ot her

properties is not necessarily indicative of mineralization on the Company’s properties.

About IsoEnergy

IsoEnergy is a well-funded uranium exploration and development company with a portfolio of prospective

projects in the eastern Athabasca Basin in Saskatchewan, Canada and a historic inferred mineral resource

estimate at the Mountain Lake uranium deposit in Nunavut. IsoEnergy is led by a Board and Management

team with a track record of success in uranium exploration, development and operations. The Company

was founded and is supported by the team at its major shareholder, NexGen Energy Ltd.

Craig Parry

Chief Executive Officer

IsoEnergy Ltd.

+1 778 379 3211

[email protected]

www.isoenergy.ca

Investor Relations

Kin Communications

+1 604 684 6730

[email protected]

www.isoenergy.ca

Neither the TSX Venture Exchange nor its Regulations Services Provider (as that term is defined in the

policies of the TSX Venture Exchange) accepts respo nsibility for the adequacy or accuracy of this

release.

This news release shall not constitute an offer to sell or a solicitation of any offer to buy any secu rities,

nor shall there be any sale of any securities in an y jurisdiction in which such offer, solicitation or sale

would be unlawful. The securities referenced herein have not been, nor will they be, registered under the

United States Securities Act of 1933, as amended (the “ U.S. Securities Act ”), and such securities may not

be offered or sold within the United States absent registration under the U.S. Securities Act or an

applicable exemption from the registration requirements thereunder.

Forward-Looking Information

The information contained herein contains “forward- looking statements” within the meaning of the

United States Private Securities Litigation Reform Act of 1995 and “forward-looking information” within

the meaning of applicable Canadian securities legislation. “Forward-looking information” includes, but is

not limited to, statements with respect to the acti vities, events or developments that the Company

expects or anticipates will or may occur in the future, including, without limitation, planned exploration

activities and completion of the acquisition of the Property. Generally, but not always, forward-looking

information and statements can be identified by the use of words such as “plans”, “expects”, “is

expected”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, or “believes” or the

negative connotation thereof 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” or the negative

connotation thereof.

Such forward-looking information and statements are based on numerous assumptions, including among

others, that the results of planned exploration act ivities are as anticipated, the price of uranium, t he

anticipated cost of planned exploration activities, that general business and economic conditions will not

change in a material adverse manner, that financing will be available if and when needed and on

reasonable terms, that third party contractors, equ ipment and supplies and governmental and other

approvals required to conduct the Company’s planned exploration activities will be available on

reasonable terms and in a timely manner and that th e acquisition of the Property will be completed on

the terms currently agreed to. Although the assumpt ions made by the Company in providing forward-

looking information or making forward-looking statements are considered reasonable by management

at the time, there can be no assurance that such assumptions will prove to be accurate.

Forward-looking information and statements also inv olve known and unknown risks and uncertainties

and other factors, which may cause actual events or results in future periods to differ materially from any

projections of future events or results expressed o r implied by such forward-looking information or

statements, including, among others: negative opera ting cash flow and dependence on third party

financing, uncertainty of additional financing, no known mineral reserves or resources, the limited

operating history of the Company, the influence of a large shareholder, alternative sources of energy and

uranium prices, aboriginal title and consultation i ssues, reliance on key management and other

personnel, actual results of exploration activities being different than anticipated, changes in exploration

programs 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 and other risks associated with the miner al exploration industry, environmental risks,

changes in laws and regulations, community relation s and delays in obtaining governmental or other

approvals.

Although the Company has attempted to identify impo rtant factors that could cause actual results to

differ materially from those contained in the forward-looking information or implied by forward-looking

information, there may be other factors that cause results not to be as anticipated, estimated or

intended. There can be no assurance that forward-looking information and statements will prove to be

accurate, as actual results and future events could differ materially from those anticipated, estimated or

intended. Accordingly, readers should not place und ue reliance on forward-looking statements or

information. The Company undertakes no obligation to update or reissue forward-looking information

as a result of new information or events except as required by applicable securities laws