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Denison President & CEO Appointed to Board of Directors of Canadian Nuclear Association

Management Changes

Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

@DenisonMinesCo

PRESS RELEASE

DENISON PRESIDENT & CEO APPOINTED TO

BOARD OF DIRECTORS OF CANADIAN NUCLEAR ASSOCIATION

Toronto, ON – June 25, 2018 Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML) (NYSE

MKT: DNN) (NYSE American: DNN) is pleased to announce that David Cates, President & CEO of Denison,

has been appointed to the Board of Directors and th e Executive Committee of the Canadian Nuclear

Association (“CNA”) at the CNA’s 58 th Annual General Meeting, held in Saskatoon on June 5, 2018.

Dr. John Barrett, President & CEO of the CNA commen ted “Denison has a long history of supporting

the CNA and we are pleased to have David join the B oard and the Executive Committee. Denison

is already an excellent steward for the nuclear ene rgy industry through its investor outreach

activities and David is expected to bring a unique perspective to the CNA leadership team based on

his involvement in Canada’s ambitious uranium exploration and development sector.”

Serving as a “member-at-large” on the Executive Com mittee, Mr. Cates will join CNA leadership

representatives from industry leading firms such as Ontario Power Generation, Cameco Corp., Bruce

Power, SNC-Lavalin, and Hatch Ltd. In addition, Mr . Cates will serve on the Board of Directors as a

representative of the CNA’s “Class 4” group of companies, which includes firms involved in manufacturi ng

and uranium exploration activities.

David Cates, President & CEO of Denison commented “I’m honoured to join the CNA Board and

Executive Committee on behalf of Denison Mines. Th e CNA plays a vital role in representing and

promoting the nuclear energy industry in Canada. D enison believes in the importance of nuclear

energy as a source of emission free, low-cost, reliable base-load energy, and that Canada’s nuclear

energy industry is uniquely bolstered by the fact t hat the Athabasca Basin region, in northern

Saskatchewan, is the most attractive jurisdiction for uranium mining investment globally.”

The Canadian Nuclear Association

The CNA is a non-profit organization established in 1960 to represent the nuclear industry in Canada a nd

promote the development and growth of nuclear technologies for peaceful purposes. The CNA’s objectives

include, creating and fostering a political environ ment and reasonable regulatory framework for advanc ing

the nuclear industry in Canada; encouraging coopera tion among various industries and agencies with a

common interest in the development of nuclear power ; providing a forum for the discussion and resoluti on

of issues of concern to members, industry or the Canadian public; and to encourage cooperation with other

associations with similar objectives and purposes.

For more information about nuclear energy in Canada , or the CNA and its members or initiatives, please

visit the CNA's website at cna.ca or contact Erin Polka, Manager of Communications & Media Relations for

the CNA, by email at [email protected], or by phone at +1-613-237-4262.

About Denison

Denison is a uranium exploration and development company with interests focused in the Athabasca Basin

region of northern Saskatchewan, Canada. In additio n to its 63.3% owned Wheeler River project, which

ranks as the largest undeveloped high-grade uranium project in the infrastructure rich eastern portion of

the Athabasca Basin region, Denison's Athabasca Basin exploration portfolio consists of numerous projects

covering approximately 353,000 hectares. Denison's interests in Athabasca Basin also include a 22.5%

ownership interest in the McClean Lake joint ventur e (“MLJV”), which includes several uranium deposits

and the McClean Lake uranium mill, which is current ly processing ore from the Cigar Lake mine under a

toll milling agreement, plus a 25.17% interest in the Midwest and Midwest A deposits, and a 65.45% interest

in the J Zone deposit and Huskie discovery on the W aterbury Lake property. Each of Midwest, Midwest A,

J Zone and Huskie are located within 20 kilometres of the McClean Lake mill.

Denison is also engaged in mine decommissioning and environmental services through its Denison

Environmental Services division and is the manager of Uranium Participation Corp., a publicly traded

company which invests in uranium oxide and uranium hexafluoride.

For more information, please contact

David Cates (416) 979-1991 ext. 362

President and Chief Executive Officer

Sophia Shane (604) 689-7842

Investor Relations

Follow Denison on Twitter @DenisonMinesCo

Cautionary Statement Regarding Forward-Looking Statements

Certain information contained in this press release constitutes "forward-looking information", within the meaning of the United States

Private Securities Litigation Reform Act of 1995 an d similar Canadian legislation concerning the busin ess, operations and financial

performance and condition of Denison. Generally, th ese forward-looking statements can be identified by the use of forward-looking

terminology such as "plans", "expects", "budget", " scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes", or the

negatives and/or variations of such words and phrases, or state that certain actions, events or results "may", "could", "would", "might" or

"will be taken", "occur", "be achieved" or "has the potential to". In particular, this press release c ontains forward-looking information

pertaining to the following: Mr. Cates’ role on the CNA Board and Executive Committee and expectations with respect to the membership

thereof; and Denison’s percentage interest in its properties and its plans and agreements with its joint venture partners, as applicable.

Forward looking statements are based on the opinions and estimates of management as of the date such statements are made, and they

are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements

of Denison to be materially different from those ex pressed or implied by forward-looking statements. D enison believes that the

expectations reflected in this forward-looking information are reasonable but no assurance can be given that these expectations will prove

to be accurate and may differ materially from those anticipated in this forward looking information. For a discussion in respect of risks and

other factors that could influence forward-looking events, please refer to the factors discussed in Denison's Annual Information Form dated

March 27, 2018 under the heading "Risk Factors". These factors are not, and should not be construed as being exhaustive. Accordingly,

readers should not place undue reliance on forward-looking statements.

The forward-looking information contained in this press release is expressly qualified by this cautionary statement. Any forward-looking

information and the assumptions made with respect thereto speaks only as of the date of this press release. Denison does not undertake

any obligation to publicly update or revise any forward-looking information after the date of this press release to conform such information

to actual results or to changes in Denison's expectations except as otherwise required by applicable legislation .