Denison Adds Additional High Grade Intersections at the Phoenix A Deposit

Denison Adds Additional High Grade Intersections at the Phoenix A Deposit 
TORONTO, ONTARIO -- (Marketwired) -- 09/11/13 -- Denison Mines Corp.
(TSX:DML)(NYSE MKT:DNN) ("Denison" or the "Company") is pleased to
announce additional high grade intersections in three more drill
holes (WR-533, 534 and 535) at the Phoenix A deposit from the
recently completed summer drilling program at the Wheeler River
property. Also, chemical assays have confirmed the very high grades
reported previously for drill hole WR-525 along the western margin of
the Phoenix A deposit. From chemical assays, the intersection in
WR-525 is 12.0 metres of 43.8% U3O8, which confirms it as the highest
grade x thickness product (GT) of any drill hole on the Wheeler River
property at 525.6 %metres. 
Wheeler River 
A total of 11,074 metres was completed in 23 drill holes during the
summer drilling program at Wheeler River, which is now complete. The
inset in the attached figure shows the location of the drilling areas
relative to the Phoenix deposits. The highlights of the program are
summarized in the table and discussed in more detail below. The table
also provides assay updates for previously reported down hole probe

       Wheeler River Summer 2013 Drilling Highlights and Assay Updates      
                  Down Hole Radiometric Probe               Assay           
                  From      To    Length     (%)    From    To  Length  U3O8
Hole-ID    Area    (m)     (m)       (m)     (1)     (m)   (m)     (m)   (%)
WR-       PHX A  410.4   413.9       3.5    36.3   407.5 415.5     8.0  20.0
WR-       PHX A  405.4   408.5       3.1    24.1   404.1 412.6     8.5  10.9
WR-       PHX A  407.5   410.1       2.6    14.8   405.5 413.5     8.0   7.3
WR-       PHX A  406.0   409.0       3.0    13.5        Core Recovery       
 501(i)                                               less than 80%,       
                                                   Probe Results Retained   
and       PHX A  411.0   412.0       1.0     3.0        Core Recovery       
                                                      less than 80%,       
                                                   Probe Results Retained   
and       PHX A             Below 1%               424.0 429.0     5.0   0.5
WR-         489  411.1   414.3       3.2     0.3   411.0 414.0     3.0   0.4
 518(i)    Zone                                                             
WR-523    PHX A  405.2   406.2       1.0     0.1        Core Recovery       
                                                      less than 80%,       
                                                   Probe Results Retained   
and       PHX A  412.6   414.6       2.0     0.1   412.0 415.0     3.0   0.1
WR-525    PHX A  401.6   411.9      10.3    43.2   400.5 412.5    12.0  43.8
WR-527    PHX A  403.5   405.2       1.7    16.4        Core Recovery       
                                                      less than 80%,       
                                                   Probe Results Retained   
WR-528    PHX A  403.7   406.8       3.1    13.0        Core Recovery       
                                                      less than 80%,       
                                                   Probe Results Retained   
WR-533    PHX A  407.1   411.6       4.5     1.5           Pending          
WR-534    PHX A  407.7   410.8       3.1    10.3           Pending          
WR-535    PHX A  404.9   407.4       2.5    19.0           Pending          
and       PHX A  408.1   409.1       1.0     1.4           Pending          
(1) - eU3O8 is radiometric equivalent uranium oxide calculated from a total 
 gamma down-hole probe                                                      
(i) - Probe results previously reported                                     

At the Phoenix A deposit eight drill holes were completed to evaluate
the potential for extensions of higher grade mineralization beyond
the limits of the higher grade domain established for the January
2013 mineral resource estimate. Five of these drill holes encountered
higher grade mineralization, with drill hole WR-525 being
particularly significant. The results suggest that further efforts to
extend higher grade mineralization are warranted in the next drill
program. Areas to be targeted include both the western and eastern
margins of Phoenix A and the western margin of Phoenix B. 
Ten of the 23 summer program drill holes were completed on wide
spaced (300 metre) fences at the 489 Zone. Only drill hole WR-518
returned significant mineralization. However, the alteration system
and structural package in the basement continues beyond the area
drilled and will be followed up in future drill programs.  
Additionally, four drill holes were completed in the Phoenix North
area and one was completed at the REa area. No significant
mineralization was encountered in these drill holes. Faulted
graphitic pelitic rocks with significant sandstone alteration and
anomalous geochemistry continue to be observed in the Phoenix North
area, and drill targets remain there. 
As mineralization in the Phoenix deposit is sub-horizontal and the
drill holes in the table are vertical, the true thickness is expected
to be approximately equal to the intersection length. The Wheeler
River property lies between the McArthur River mine and Key Lake mill
complex in the Athabasca Basin in northern Saskatchewan. Denison is
the operator and holds a 60% interest in the project. Cameco
Corporation holds a 30% interest and JCU (Canada) Exploration
Company, Limited holds the remaining 10% interest. 
Other Activities 
Denison is also completing exploration programs at seven other
Athabasca Basin properties this summer; Waterbury Lake (60% Denison,
40% KEPCO), Packrat (100% Denison), South Dufferin (100% Denison),
Johnston Lake (100% Denison) and Moon Lake (55% Denison, 45% Uranium
Waterbury Lake 
Linecutting and geophysical (DC-resistivity) surveying was completed
along trend northwest of the J-Zone uranium deposit at Waterbury Lake
during August. An initial interpretation suggests that the area has
geophysical features that are analogous to the J-Zone and Midwest
deposits. A six hole diamond drilling program has begun to follow up
on the results.  
A six hole diamond drilling program on structural/geophysical targets
at the Packrat property was completed in early August. Weakly
elevated radioactivity was encountered in basement rocks associated
with alteration and faulting in two of the drill holes. Geochemical
analyses are pending. If the geochemistry is sufficiently
encouraging, follow up drilling will be required in 2014. 
South Dufferin 
At South Dufferin, ten short diamond drill holes were completed on
geophysical targets at this property located along the south rim of
the Athabasca basin. No significant mineralization was intersected,
although several shear zones in the basement rocks were encountered
that confirm the presence of the Dufferin Lake fault system through
the property. Geochemical analyses are pending.  
Bachman Lake, Crawford Lake and Moon Lake 
Drilling of six holes at Bachman Lake, Crawford Lake and Moon Lake is
currently underway and is being conducted as a combined program due
to their close proximity. International Enexco Limited is funding the
Bachman Lake drilling to earn a 20% interest in that property.  
Johnston Lake 
DC-resistivity geophysical surveying is underway at Johnston Lake and
will be followed by a six hole drilling campaign in September. 
Qualified Person 
The disclosure of a scientific or technical nature contained in this
news release was prepared by Steve Blower P.Geo., Denison's Vice
President, Exploration, who is a Qualified Person in accordance with
the requirements of NI 43-101. For a description of the quality
assurance program and quality control measures applied by Denison,
please see Denison's Annual Information Form dated March 13, 2013
filed under the Company's profile on SEDAR at 
About Denison 
Denison is a uranium exploration and development company with
interests in exploration and development projects in Canada, Zambia,
Namibia, and Mongolia. Including the high grade Phoenix deposits,
located on its 60% owned Wheeler project, Denison's exploration
project portfolio includes 49 projects and totals approximately
603,000 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, a 75% interest in the newly acquired Dome
project in Namibia, 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 division and is the
manager of Uranium Participation Corporation, a publicly traded
company which invests in uranium oxide and uranium hexafluoride. 
To view the map accompanying this press release, click on the
following link: 
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 mineral resources;
expectations regarding the toll milling of Cigar Lake ores; capital
expenditure programs, estimated exploration and development
expenditures and reclamation costs; expectations of market prices and
costs; supply and demand for uranium ("U3O8"); possible impacts of
litigation and regulatory actions on Denison; exploration,
development and expansion plans and objectives; expectations
regarding adding to its mineral reserves and resources through
acquisitions and exploration; and receipt of regulatory approvals,
permits and licenses 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 the factors discussed in or referred to under the
heading "Risk Factors" in Denison's Annual Information Form dated
March 13, 2013 available at, and in its Form
40-F available at 
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. 
Cautionary Note to United States Investors Concerning Estimates of
Measured, Indicated and Inferred Mineral Resources: This press
release may use the terms "measured", "indicated" and "inferred"
mineral resources. United States investors are advised that while
such terms are recognized and required by Canadian regulations, the
United States Securities and Exchange Commission does not recognize
them. "Inferred mineral resources" have a great amount of uncertainty
as to their existence, and as to their economic and legal
feasibility. It cannot be assumed that all or any part of an inferred
mineral resource will ever be upgraded to a higher category. Under
Canadian rules, estimates of inferred mineral resources may not form
the basis of feasibility or other economic studies. United States
investors are cautioned not to assume that all or any part of
measured or indicated mineral resources will ever be converted into
mineral reserves. United States investors are also cautioned not to
assume that all or any part of an inferred mineral resource exists,
or is economically or legally mineable.
Denison Mines Corp.
Ron Hochstein
President and Chief Executive Officer
(604) 689-7842 
Denison Mines Corp.
Steve Blower
Vice-President, Exploration
(604) 689-7842
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