Denison Mines (DNN) F-10/ARegistration of securities (Canada) (amended)

Exhibit 5.5

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-10 of Denison Mines Corp. in connection with the reports entitled (a) “Prefeasibility Study Report for the Wheeler River Uranium Project, Saskatchewan, Canada” dated October 30, 2018, (b) “Preliminary Economic Assessment for Tthe Heldeth Túé (J Zone) Deposit, Waterbury Lake Property, Northern Saskatchewan, Canada” dated December 23, 2020 and (c) “Technical Report with an Updated Mineral Resource Estimate for the Midwest Property, Northern Saskatchewan, Canada” dated March 26, 2018, and (2) all other references to the undersigned company included or incorporated by reference in the Registration Statement on Form F-10 of Denison Mines Corp.