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Actionable news in DNN: DENISON MINES CORP,

Denison Mine: Item 1 Name And Address Of Company

The following excerpt is from the company's SEC filing.

Denison Mines Corp. (the Company)

1100-40 University Ave

Toronto, Ontario, M5J 1T1

Item 2 Date of Material Change

November 3, 2015

Item 3 News Release

The news release was disseminated in Canada on November 3, 2015 through the facilities of Marketwired and subsequently filed on SEDAR.

Item 4 Summary of Material Change

The Company reported a significant increase in the estimated mineral resources at its 60% owned Wheeler River property in Northern Saskatchewan as the result of an initial mineral resource estimate for the Gryphon deposit. The initial resource estimate for the Gryphon deposit adds inferred mineral resources of 43.0 million pounds U

to Wheeler River, which is already host to 70.2 million pounds U

of indicated mineral resources at the Phoenix deposit.

Item 5 Full Description of Material Change

An independent mineral resource estimate was completed by RPA Inc. (RPA) for the Gryphon deposit on the Wheeler River property in Northern Saskatchewan. RPA estimates that the Gryphon deposit contains an inferred mineral resource of 43.0 million lbs U

(above a cutoff grade of 0.2% U

) based on 834,000 tonnes of mineralization at an average grade of 2.3% U

. The mineral resource estimate for Gryphon is in addition to mineral resources previously estimated for the Phoenix deposit, which is also on the Wheeler River property. The Phoenix deposit is estimated to contain an indicated mineral resource of 70.2 million pounds U

(above a cutoff grade of 0.8% U

) based on 166,000 tonnes of mineralization at an average grade of 19.1%, plus an inferred mineral resource of 1.1 million pounds U

(also above a cutoff grade of 0.8% U

) based on 9,000 tonnes of mineralization at an average grade of 5.8% U3O

Please also see the news release attached as Schedule A hereto.

Item 6 Reliance on subsection 7.1(2) or (3) of National Instrument 51-102

Not applicable.

Item 7 Omitted Information

Item 8 Executive Officer

The following executive officer of the Company is knowledgeable about the material change disclosed in this report and may be contacted as follows:

David Cates

President and Chief Executive Officer

Tel: (416) 979-1991 ext. 362

Item 9 Date of Report

November 10, 2015

Schedule A

Denison Mines Corp.

1100 40 University Avenue

Toronto, ON, M5J1T1

Ph. 416-979-1991 Fx. 416-979-5893

www.denisonmines.com

PRESS RELEASE

DENISON ANNOUNCES SIGNIFICANT INCREASE IN

WHEELER RIVER RESOURCE WITH 43M LB

INITIAL ESTIMATE FOR GRYPHON

Toronto, ON November 3, 2015 Denison Mines Corp.

(TSX: DML) (NYSE MKT:DNN) (Denison or the Company) is pleased to announce a significant increase in the estimated mineral resources on Denisons 60% owned Wheeler River property in Northern Saskatchewan. The initial resource estimate for the Gryphon Deposit adds inferred mineral resources of 43.0 million pounds U

to a property that is already host to 70.2 million pounds U

of indicated mineral resources at the Phoenix deposit. Together, Gryphon and Phoenix create a desirable combination of large resource size and high grades with the potential for co-development.

2015 Wheeler River Property Mineral Resource Estimate Summary

Category

Tonnes

Million lbs U

(100% Basis)

Million lbs U

(Denisons Share)

Inferred

Indicated

Notes:

CIM Definitions were followed for classification of mineral resources.

Mineral resources for the Gryphon deposit are reported above a cut-off grade of 0.2% U

Mineral resources for the Phoenix deposit are reported above a cut-off grade of 0.8% U

The cut-off grade is based on internal conceptual studies and a price of US$50 per lb U

Mineral resources for the Phoenix deposit were last estimated in 2014 to reflect the expansion of the high-grade zone. As no new drilling has been completed at Phoenix since that time, the mineral resource estimates for the Phoenix deposit remain current.

David Cates, President and CEO of Denison commented,

Were very pleased with the results at Wheeler River. With this initial mineral resource estimate for the Gryphon deposit and the expansion of the high-grade Phoenix deposit in 2014, the project has grown significantly in size and now represents one of the largest and highest grade undeveloped projects in the Athabasca Basin region. Our Saskatoon based exploration team deserves considerable recognition. Their innovative approach to exploration has led to the recent discovery of the Gryphon deposit and has created an entirely new area of highly prospective targets surrounding Gryphon along the K-North trend, which remains largely untested and will continue to be the focus of future exploration.

Initial Resource Estimate for Gryphon

Since its discovery in early 2014, Denison has completed 35 drill holes at Gryphon at a spacing of approximately 50 metres x 50 metres to define the deposit over an area measuring approximately 450 metres x 80 metres. The result of these efforts is an inferred mineral resource estimate of 43,037,000 lbs U

) based on 834,000 tonnes of mineralization at an average grade of 2.3% U

. Figure 1 illustrates the location of the Gryphon Deposit on the Wheeler River property and Figure 2 is a plan view of the grade x thickness contours at the Gryphon Deposit.

Wheeler River Project Highlights

The basement hosted Gryphon deposit, which is expected to be well suited to conventional mining, complements the exceptionally high grade unconformity hosted mineralization at the Phoenix deposit located only three kilometres away (see Figure 1);

Together, Gryphon and Phoenix create a desirable combination of large resource size and high grades Wheeler River now contains an indicated mineral resource of 70.2M lbs U

at a grade of 19.1% U

and inferred mineral resources...


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