Denison Mines Announces Closing Of Acquisition of JNR Resources Inc.

Denison Mines Announces Closing Of Acquisition of JNR Resources Inc. 
TORONTO, ONTARIO -- (Marketwire) -- 02/01/13 -- Denison Mines Corp.
(TSX:DML)(NYSE MKT:DNN)(NYSE Amex:DNN) ("Denison") is pleased to
announce the closing of its previously announced acquisition of the
outstanding common shares of JNR Resources Inc. ("JNR"). The
transaction was completed pursuant to a plan of arrangement (the
"Arrangement") in accordance with the Business Corporations Act
(British Columbia), which was approved by the British Columbia
Supreme Court yesterday. Securityholders of JNR approved the
Arrangement on January 28, 2013. All conditions of closing have now
been satisfied by both parties. 
Pursuant to the Arrangement, the former shareholders of JNR will
receive, for each JNR common share held, 0.073 of a Denison common
share (the "Exchange Ratio"). All of the outstanding options and
common share purchase warrants of JNR are exchanged for options and
warrants to purchase common shares of Denison and are exercisable to
acquire that number of common shares of Denison and at an exercise
price determined by reference to the Exchange Ratio. 
With the completion of the Arrangement, JNR common shares have now
ceased trading on the TSX Venture Exchange and are expected to cease
to be listed on the TSX Venture Exchange shortly. JNR will also apply
to cease to be a reporting issuer under the securities laws of
British Columbia and Alberta. 
For shareholders and warrantholders who held their JNR shares or
warrants through a broker, the issuance of Denison common shares in
exchange for JNR common shares and Denison warrants in exchange for
JNR warrants will be processed through their broker. Registered
shareholders and warrantholders of JNR must deposit their JNR common
share or warrant certificates with Computershare Investor Services
Inc., as depository, with a validly completed letter of transmittal,
in order to receive their Denison common shares and replacement
Denison warrants. A letter of transmittal was mailed to registered
shareholders and warrantholders in early January 2013. Details of the
required process are set forth in JNR's management information
circular dated December 17, 2012, a copy of which is available under
JNR's profile at and in Denison's registration
statement on Form-80 (File No. 333-185906) filed with the U.S.
Securities and Exchange Commission at 
Any questions regarding the exchange of JNR common shares for Denison
common shares, including any request for another letter of
transmittal, should be directed to your broker, if applicable, or the
depositary, Computershare Investor Services Inc., via telephone at 1
(800) 564-6253. Details of the Arrangement were contained in JNR's
management information circular and in Denison's registration
statement on Form-80 (File No. 333-185906) filed with the U.S.
Securities and Exchange Commission at 
About Denison Mines Corp. 
Denison Mines Corp. is a uranium exploration and development company
with interests in exploration and development projects in
Saskatchewan, Zambia and Mongolia. Including the world class Phoenix
deposits, located on its 60% owned Wheeler River project, Denison's
exploration project portfolio includes 26 projects and totals over
330,000 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, and a
25.17% interest in the Midwest deposit, which is located 15
kilometres from 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.  
Additional information about Denison is available on Denison's
website at or under its profile on SEDAR at and on EDGAR at 
Denison Mines Corp.
Ron Hochstein
President, CEO & Director
(416) 979-1991, ext. 232 
Denison Mines Corp.
Sophia Shane
Investor Relations
(604) 689 - 7842
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