Fission Energy Corp. to Cease Trading Upon Close of Business April 29, 2013

FISSION ENERGY CORP. ("Fission" or the "Company") (TSX
VENTURE:FIS)(OTCQX:FSSIF)(FRANKFURT:6FS) advises that Fission's common shares
("Fission Shares") will cease trading on the TSX-V upon close of business on
Monday, April 29, 2013 and are expected to be de-listed shortly after that.


Pursuant to the Arrangement between Fission and Denison Mines Corp. ("Denison"),
each Fission Share held at the close of business on April 29, 2013 will entitle
the holder to 0.355 of a common share of Denison ("Denison Shares"), a nominal
cash amount of CDN$0.0001 and a common share of a newly incorporated exploration
company, Fission Uranium Corp. ("Fission Uranium"). Fission Uranium's common
shares are expected to commence trading on the TSX-V on Wednesday, May 1, 2013
under the symbol "FCU".


If you hold your Fission Shares through a broker or other person, please contact
that broker or other person for instructions and assistance in receiving Denison
Shares and Fission Uranium Shares in respect of your Fission Shares.


If you are a registered Fission shareholder, please complete and return the
Letter of Transmittal together with the certificate(s) representing your Fission
Shares and any other required documents and instruments, to the depositary,
Computershare Investor Services Inc., in accordance with the instructions set
out in the Letter of Transmittal. The Letter of Transmittal contains other
procedural information related to the Arrangement and should be reviewed
carefully. The Letter of Transmittal and Notice of Meeting and Management
Information Circular contain detailed information to assist you in obtaining
your Denison Shares and Fission Uranium Shares and are available on Fission's
SEDAR profile at www.sedar.com. If you require assistance, you should consult
your financial, legal, or other professional advisors. In addition, you can
contact Computershare Investor Services Inc. at Toll Free: 1-800-564-6253 (North
America); Phone: [phone] (Overseas); or Email:
[e-mail].


About Fission Energy Corp. & Denison Mines Corp.

Fission Energy Corp. is a wholly owned subsidiary of Denison Mines Corp. 

Denison Mines Corp. is a uranium exploration and development company with
interests in exploration and development projects in Canada, Zambia and
Mongolia. Including the high grade Phoenix deposits, located on its 60% owned
Wheeler River project, Denison's exploration project portfolio includes 51
projects and totals over 700,000 hectares in the Eastern Athabasca Basin region
of Saskatchewan. Denison's interests in Saskatchewan also include a 22.5%
ownership interest in the McClean Lake Joint Venture, which includes several
uranium deposits and the McClean Lake uranium mill, one of the world's largest
uranium processing facilities, plus a 25.17% interest in the Midwest deposit and
a 60% interest in the J-Zone deposit on the Waterbury property. Both the Midwest
and J-Zone deposits are located within 20 kilometres of the McClean Lake mill.
Internationally, Denison owns 100% of the conventional heap leach Mutanga
project, in Zambia, and an 85% interest in the in-situ recovery projects held by
the Gurvan Saihan Joint Venture, in Mongolia.


Denison is engaged in mine decommissioning and environmental services through
its Denison Environmental Services (DES) division and is the manager of Uranium
Participation Corporation (TSX-U), a publicly traded company which invests in
uranium oxide in concentrates and uranium hexafluoride


Cautionary 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 and similar Canadian legislation concerning the
business, operations and financial performance and condition of Denison.


Generally, these 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", "be achieved" or "has the
potential to".


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, level of activity, performance or achievements of Denison to be
materially different from those expressed or implied by such forward looking
statements. Denison 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 correct and such forward looking information
included in this press release should not be unduly relied upon. This
information speaks only as of the date of this press release. In particular,
this press release may contain forward looking information pertaining to the
following: the estimates of Denison's mineral reserves and resources; capital
expenditure programs; expectations regarding the toll milling of Cigar Lake
ores; exploration and development expenditures and reclamation costs;
expectations of market prices and costs; supply and demand for uranium; possible
impacts of litigation and regulatory actions on Denison; exploration,
development and expansion plans and objectives; future royalty and tax payments
and rates; Denison's expectations regarding raising capital and adding to its
mineral reserves and resources through acquisitions and exploration; and receipt
of regulatory approvals, permits and licences under governmental regulatory
regimes.


There can be no assurance that such statements will prove to be accurate, as
Denison's actual results and future events could differ materially from those
anticipated in this forward-looking information as a result of those factors
discussed in or referred to under the heading "Risk Factors" in Denison's Annual
Information Form dated March 13, 2013, available at http://www.sedar.com, and in
its Form 40-F available at http://www.sec.gov, as well as the following: global
financial conditions; the ability of Denison to meet its obligations to its
creditors and the uncertainty of funding; volatility in the market price of the
Company's shares and the risk of dilution from future equity financings; the
impact of volatility in uranium prices on the valuation of Denison's mineral
reserves and resources and the market price of its shares; public acceptance of
nuclear energy and competition from other energy sources; failure to realize
benefits from transactions; competition for properties; the imprecision of
mineral reserves and resources estimation; Denison's ability to expand and
replace its mineral reserves and resources; uncertainty as to reclamation and
decommissioning liabilities; reliance on other operators; technical innovation
rendering Denison's products and services obsolete; property title risk;
liabilities inherent in mining operations and the adequacy of insurance
coverage; delays in obtaining permits and licences for development properties;
the speculative nature of exploration and development projects; difficulty
complying with changing government regulations and policy, including without
limitation, compliance with environment, health and safety regulations;
uncertainty surrounding Denison's operations in foreign jurisdictions; potential
claims of Canada's first nations people; dependence on key personnel; the
potential influence of Denison's largest Shareholder, Korea Electric Power
Corporation; potential conflicts of interest for the Company's directors who are
engaged in similar businesses; and limitations of disclosure and internal
controls.


Accordingly, readers should not place undue reliance on forward-looking
statements. These factors are not, and should not be construed as being,
exhaustive. Statements relating to "mineral reserves" or "mineral resources" are
deemed to be forward-looking information, as they involve the implied
assessment, based on certain estimates and assumptions that the mineral reserves
and mineral resources described can be profitably produced in the future. The
forward-looking information contained in this press release is expressly
qualified by this cautionary statement. 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.




FOR FURTHER INFORMATION PLEASE CONTACT: 
Fission Energy Corp.
Ron Hochstein
President and Chief Executive Officer
[phone] ext 232


Fission Energy Corp.
Sophia Shane
Investor Relations
[phone]