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Exhibit
99.15
CONSENT OF
GEOLOGIST
Ladies and
Gentlemen:
The undersigned hereby
consents to (1) the references to the undersigned’s name
included or incorporated by reference in the Annual Report on Form
40-F of Denison Mines Corp. in connection with the report entitled
“Technical Report with an Updated Mineral Resource Estimate
for the Waterbury Lake Property, Northern Saskatchewan” dated
December 21, 2018, and (2) all other references to the undersigned
included or incorporated by reference in the Annual Report on Form
40-F of Denison Mines Corp.
Dated: March 13,
2019
(Signed)
“Allan
Armitage”
___________________________
Allan Armitage, Ph.D.,
P.Geo.