Exhibit 99.1

Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo

May 9, 2024

VIA SEDAR

Ontario Securities Commission

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Financial Services Commission

The Manitoba Securities Commission

Authorité des marchés financiers (Québec)

Financial and Consumer Services Commission (New Brunswick)

Nova Scotia Securities Commission

Office of the Superintendent of Securities, Service Newfoundland and Labrador

Office of the Superintendent of Securities, Government of Prince Edward Island

Office of the Superintendent of Securities, Northwest Territories

Office of the Yukon Superintendent of Securities

Nunavut Securities Office

The Toronto Stock Exchange

Denison Mines Corp. - Report of Voting Results

In accordance with Section 11.3 of National Instrument 51-102 – Continuous Disclosure Obligations, we hereby advise of the results of the voting on the matters submitted to the annual general meeting (the “Meeting”) of the shareholders (the “Shareholders”) of Denison Mines Corp. (the “Corporation”) held on May 9, 2024.

The matters voted upon at the Meeting and the results of the voting were as follows:

Election of Directors

The seven nominees set forth in the Corporation’s Management Information Circular dated March 28, 2024 (the “Circular”) were elected as directors of the Corporation by a majority of votes cast by proxy or in person at the Meeting. If a ballot had been taken, based upon the scrutineer’s report on those in attendance or voting by proxy, the voting results would have been as follows:

Nominee	Votes For	% For	Votes Withheld	% Withheld
David Cates	384,833,396	99.58%	1,619,036	0.42%
Brian Edgar	383,841,473	99.32%	2,610,960	0.68%
Jong Ho Hong	385,348,852	99.71%	1,103,581	0.29%
David Neuburger	382,086,817	98.87%	4,365,616	1.13%
Laurie Sterritt	381,856,131	98.81%	4,596,301	1.19%
Jennifer Traub	371,577,666	96.15%	14,874,765	3.85%
Patricia Volker	381,607,250	98.75%	4,845,181	1.25%

Re-appointment of Auditors

By majority vote cast by proxy or in person at the Meeting, KPMG LLP was re-appointed auditor of the Corporation to hold office until the close of the next annual meeting of shareholders or until its successor is appointed, and the directors of the Corporation were authorized to fix the remuneration of the auditor. If a ballot had been taken, based upon the scrutineer’s report on those in attendance or voting by proxy, the voting results on the appointment of the auditors would have been as follows:

Votes For	% For	Votes Withheld	% Withheld
473,780,048	99.45%	2,634,512	0.55%

Advisory Vote on Executive Compensation

By majority vote cast by proxy or in person at the Meeting, a non-binding advisory resolution accepting the Corporation’s approach to executive compensation (the “Executive Compensation Resolution”) was approved. If a ballot had been taken, based upon the scrutineer’s report on those in attendance or voting by proxy, the voting results on the Executive Compensation Resolution would have been as follows:

Votes For	% For	Votes Against	% Against
376,747,490	97.49%	9,704,941	2.51%

DENISON MINES CORP.
By:	(signed) “Amanda Willett”
	Amanda Willett
	VP Legal & Corporate Secretary