Exhibit 99.16 SRK Consulting (Canada) Inc.              
1500, 155 University Avenue Toronto, Ontario, Canada M5H 3B7 T: +1.416.601.1445 F: +1.416.601.9046 toronto@srk.com www.srk.com

CONSENT OF ENGINEER

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 Midwest Property, Northern Saskatchewan, Canada” dated March 26, 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 28, 2018

 (Signed) “Oy Leuangthong”

__________________________

Oy Leuangthong, PEng.

SRK Consulting (Canada) Inc.

Local Offices: Saskatoon Sudbury Toronto Vancouver Yellowknife Group Offices: Africa Asia Australia Europe North America South America