Exhibit 18

Scott Wilson Roscoe Postle Associates Inc Suite 501, 55 University Avenue, Toronto, ON M5J 2H7
T (416) 947-0907 F (416) 947-0395
www.scottwilson.com

CONSENT OF EXPERT

VIA SEDAR

December 16, 2010

British Columbia Securities Commission
Alberta Securities Commission
Ontario Securities Commission
Nova Scotia Securities Commission

Dear Sirs/Mesdames:

Re: Denison Mines Corp. (the “Company”) — Filing of a Short Form Prospectus Dated December 16, 2010 (the “Prospectus”)

Pursuant to Section 4.2(vii) of National Instrument 44-101 — Short Form Prospectus Distributions, this letter is being filed as the consent of Richard E. Routledge, M.Sc., P.Geo., of Scott Wilson Roscoe Postle Associates Inc. to being named in the Prospectus and the documents incorporated by reference therein and to the inclusion of reference to, summary of, and certain excerpts of, the following technical reports (the “Technical Reports”) in the Prospectus or any other document incorporated by reference therein:

• Technical Report on the Sue D Uranium Deposit Mineral Resource Estimate, Saskatchewan, Canada dated March 31, 2006;

• Technical Report on the Midwest Uranium Deposit Mineral Resource and Mineral Reserve Estimates, Saskatchewan, Canada dated June 1, 2005, as amended on February 14, 2006;

• Technical Report on the Denison Mines Inc. Uranium Properties, Saskatchewan, Canada dated November 21, 2005, as amended on February 16, 2006; and

• Technical Report on the Mineral Resource Estimate for the McClean North Uranium Deposits, Saskatchewan dated January 31, 2007.

I confirm that I have read the Prospectus and have no reason to believe that there are any misrepresentations (as defined in the Securities Act (Ontario)) in the information contained therein that are derived from the information in the Technical Reports or, within my knowledge, as a result of the services I performed in connection with the Technical Reports.

Yours very truly,

(Signed) “Richard E. Routledge”

Richard E. Routledge, M.Sc., P.Geo.