Exhibit 4.15

CONSENT OF ENGINEER

Ladies and Gentlemen:

The undersigned company hereby consents to (1) the references to the undersigned company’s name included or incorporated by reference in the registration statement on Form F-80 of Denison Mines Corp. in connection with the report entitled “Technical Report on the Midwest A Uranium Deposit of Saskatchewan, Canada” dated January 31, 2008 and (2) all other references to the undersigned company included or incorporated by reference in the registration statement on Form F-80 of Denison Mines Corp.

Dated: January 7, 2013

SGS GEOSTAT LTD.

By: /s/ Michel Dagbert

Name: Michel Dagbert

Title: Senior Consultant