<SEC-DOCUMENT>0001063259-25-000010.txt : 20251217
<SEC-HEADER>0001063259-25-000010.hdr.sgml : 20251217
<ACCEPTANCE-DATETIME>20251217104407
ACCESSION NUMBER:		0001063259-25-000010
CONFORMED SUBMISSION TYPE:	6-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20251217
FILED AS OF DATE:		20251217
DATE AS OF CHANGE:		20251217

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DENISON MINES CORP.
		CENTRAL INDEX KEY:			0001063259
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS METAL ORES [1090]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			A6
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		6-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33414
		FILM NUMBER:		251577587

	BUSINESS ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		40 UNIVERSITY AVE., SUITE 1100
		CITY:			TORONTO
		PROVINCE COUNTRY:   	A6
		ZIP:			M5J 1T1
		BUSINESS PHONE:		(416) 979-1991

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		40 UNIVERSITY AVE., SUITE 1100
		CITY:			TORONTO
		PROVINCE COUNTRY:   	A6
		ZIP:			M5J 1T1

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERNATIONAL URANIUM CORP
		DATE OF NAME CHANGE:	19980603
</SEC-HEADER>
<DOCUMENT>
<TYPE>6-K
<SEQUENCE>1
<FILENAME>form6-k.htm
<DESCRIPTION>FORM 6-K DATED DECEMBER 17, 2025
<TEXT>
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<div style="text-align: center; text-indent: 0px; padding-top: 5.3px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 24px; font-weight: bold;">UNITED STATES</font></div>
<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 24px; font-weight: bold;">SECURITIES AND EXCHANGE COMMISSION</font></div>
<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">Washington, D.C. 20549</font></div>
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<div style="text-align: center; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 24px; font-weight: bold;">FORM 6-K</font></div>
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<br>
<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE
13a-16 OR 15d-16</font></div>
<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">UNDER THE SECURITIES EXCHANGE ACT OF 1934</font></div>
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<div style="text-align: center; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">Date: December 17, 2025</font></div>
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<div style="text-align: center; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Commission File Number:</font> <font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">001-33414</font></div>
<div style="text-align: center; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div style="text-align: center; text-indent: 0px; padding-bottom: 2.7px; margin-right: 0px; margin-left: 0px; line-height: 1;"><font style="font-family: Times New Roman; font-size: 13px;"><font style="font-family: Times New Roman; font-size: 32px; font-weight: bold;">Denison Mines Corp.</font>&#xA0;<br></font></div>
<div style="text-align: left; width: 100%; text-indent: 0px; margin-right: 0px; margin-left: 0px; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"><!--Rule Below Paragraph--></div>
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registrant)</font></font></div>
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<div style="text-align: left; width: 100%; text-indent: 0px; margin-right: 0px; margin-left: 0px; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"><!--Rule Below Paragraph--></div>
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<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px; line-height: 1; padding-top: 8px;"><font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">1100-40 University Avenue</font> <font style="font-family: Times New Roman; font-size: 13px;"><br>
</font></div>
<div style="text-align: center; text-indent: 0px; padding-top: 8px; margin-right: 0px; margin-left: 0px; line-height: 1;"><font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">Toronto Ontario</font></div>
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</font></div>
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<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;<font style="font-style: italic">(Address of
principal executive offices)</font></font></div>
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<div style="text-align: left; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;Indicate by check mark whether the registrant files
or will file annual reports under cover Form 20-F or Form
40-F.</font></div>
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<div style="text-align: center; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Form
20-F&#xA0;&#xA0;&#x2610;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;Form&#xA0;&#xA0;&#xA0;&#xA0;40-F&#xA0;&#xA0;&#xA0;&#x2612;</font></div>
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<div style="text-align: left; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Indicate by check mark if the registrant is submitting the
Form 6-K in paper as permitted by Regulation S-T Rule
101(b)(1):&#xA0;&#xA0;&#x2610;</font></div>
<div style="text-align: left; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Indicate by check mark if the registrant is submitting the
Form 6-K in paper as permitted by Regulation S-T Rule
101(b)(7):&#xA0;&#xA0;&#x2610;</font></div>
<div style="text-align: justify; text-indent: 0px; margin-right: 0px; margin-left: 0px;"></div>
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<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"> <font style="font-family: Times New Roman; font-size: 13px; font-weight: bold;">SIGNATURES<br></font></div>
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<div style="text-align: left; text-indent: 0px; padding-top: 16px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Pursuant to the requirements of the Securities Exchange Act
of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly
authorized.</font></div>
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<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-weight: bold">DENISON MINES
CORP.</font><br></div>
</td>
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<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<td colspan="3" style="width: 48%; vertical-align: top; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 2px; border-bottom-style: solid;">
<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px; font-style: italic;">/s/ Amanda Willett</font></div>
</td>
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<td style="width: 47%; vertical-align: top;">
<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Date<font style="font-weight: bold;">:&#xA0;</font>&#xA0;December 17,
2025</font></div>
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<td style="width: 1%; vertical-align: bottom;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Amanda
Willett</font></div>
</td>
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<td style="width: 47%; vertical-align: top;">
<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Vice
President Legal and Corporate Secretary</font></div>
</td>
</tr></table>
</div>
<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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</div>
<div style="text-align: justify; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;"><font style="font-weight: bold;">FORM 6-K
EXHIBIT INDEX</font></font></div>
<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;</font></div>
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<div style="text-align: center; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Exhibit&#xA0;Number</font></div>
</td>
<td style="width: 5%; vertical-align: bottom;">
<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">&#xA0;&#xA0;</font></div>
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<div style="text-align: left; text-indent: 0px; margin-right: 0px; margin-left: 0px;"><font style="font-family: Times New Roman; font-size: 13px;">Description</font></div>
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<div style="text-align: center"><font style="font-family: Times New Roman; font-size: 13px;"><br></font></div>
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<div style="text-align: center">99.1</div>
</td>
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<div><font>&#xA0;</font></div>
</td>
<td><a href="dmc-pr20251217russelltran.htm"><font style="text-decoration: underline;">Press release dated December 17,
2025</font></a></td>
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<div style="text-align: center"><br></div>
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<div><font>&#xA0;</font></div>
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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>dmc-pr20251217russelltran.htm
<DESCRIPTION>PRESS RELEASE DATED DECEMBER 17, 2025
<TEXT>
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<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
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<div style="text-align: right; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 11px;"><font style="font-weight: bold">Exhibit 99.1</font>&#xA0;</font></div>
<div style="text-align: right; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 11px;">&#xA0;</font></div>
<div style="text-align: left">
<table cellpadding="0" cellspacing="0" style="text-align: left; margin: 0 auto;width: 100%;; font-family: inherit; font-size: inherit">
<tr>
<td style="width: 50%; vertical-align: bottom;">
<div><img src="denison70logo.jpg"></div>
</td>
<td style="width: 50%">
<div><font>&#xA0;</font>
<div style="text-align: right; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 11px">Denison Mines
Corp.</font></div>
<div style="text-align: right; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 11px">1100 &#x2013; 40
University Ave</font></div>
<div style="text-align: right; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 11px">Toronto, ON M5J
1T1</font></div>
<div style="text-align: right; margin-left: 24px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 11px">www.denisonmines.com</font></div>
</div>
</td>
</tr></table>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Arial; font-size: 13px">PRESS
RELEASE</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: center; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold"><font style="color: #000000; font-family: Arial; font-size: 13px">Denison
Announces Closing of Transaction with Skyharbour and Formation of
Four Prospective Exploration Joint Ventures Proximal to Wheeler
River</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px"><font style="font-weight: bold; color: #000000">Toronto, ON &#x2013; December
17, 2025. Denison Mines Corp.</font> <font style="color: #000000">(&#x201C;</font><font style="font-weight: bold; color: #000000">Denison</font><font style="color: #000000">&#x201D; or the &#x201C;</font><font style="font-weight: bold; color: #000000">Company</font><font style="color: #000000">&#x201D;) (TSX: DML; NYSE American: DNN) is pleased
to announce that it has closed the previously announced transaction
(the &#x201C;</font><font style="font-weight: bold; color: #000000">Transaction</font><font style="color: #000000">&#x201D;) with Skyharbour Resources Ltd.
(&#x201C;</font><font style="font-weight: bold; color: #000000">Skyharbour</font><font style="color: #000000">&#x201D;) (</font><font style="font-weight: bold; color: #000000">TSX-V:SYH</font><font style="color: #000000">) (</font><font style="font-weight: bold; color: #000000">OTCQX: SYHBF),
(Frankfurt:SC1P)</font> <font style="color: #000000">and the
formation of four joint ventures consisting of claims previously
comprising Skyharbour&#x2019;s Russell Lake Uranium Project
(&#x201C;</font><font style="font-weight: bold; color: #000000">Russell</font><font style="color: #000000">&#x201D;), which is located directly adjacent to
Denison&#x2019;s flagship Wheeler River Project
(&#x201C;</font><font style="font-weight: bold; color: #000000">Wheeler
River</font><font style="color: #000000">&#x201D;).</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-family: Arial; font-size: 12px">The
new joint ventures are designed to drive collaboration between
Denison and Skyharbour&#x2019;s technical teams and to accelerate
the evaluation of the prospective exploration ground adjacent to
and proximal to Wheeler River. Denison will serve as the operator
for the Wheeler North and Wheeler River Inliers joint ventures,
with ownership interests of 49% and 70% respectively. Skyharbour
will serve as the operator for the Russell Lake (or
&#x201C;RL&#x201D;) and Getty East joint ventures, with Denison
having ownership interests of 20% and 30%,
respectively.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px"><font style="color: #000000">In addition, Denison and Skyharbour have entered
into option agreements (the &#x201C;</font><font style="font-weight: bold; color: #000000">Earn-In Option
Agreements</font><font style="color: #000000">&#x201D;), which allow
Denison to increase its ownership interest in each of the Wheeler
North and Getty East joint ventures to up to
70%.</font></font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-style: italic; font-family: Arial; font-size: 12px">
About Denison</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 12px">
Denison is a leading uranium mining, development, and exploration
company with interests focused in the Athabasca Basin region of
northern Saskatchewan, Canada. Denison has an effective 95%
interest in its flagship Wheeler River Uranium Project, which is
the largest undeveloped uranium project in the infrastructure rich
eastern portion of the Athabasca Basin region of northern
Saskatchewan.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 12px">
In mid-2023, the Phoenix feasibility study was completed for the
Phoenix deposit as an ISR mining operation, and an update to the
previously prepared 2018 Pre-Feasibility Study ('PFS') was
completed for Wheeler River's Gryphon deposit as a conventional
underground mining operation. Based on the respective studies, both
deposits have the potential to be competitive with the lowest cost
uranium mining operations in the world. Permitting efforts for the
planned Phoenix ISR operation commenced in 2019 and are nearing
completion with approval in July 2025 of the project's EA by the
Province of Saskatchewan and conclusion in December 2025 of the
Canadian Nuclear Safety Commission Public Hearing for Federal
approval of the EA and project construction license.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 12px">
Denison's interests in Saskatchewan also include a 22.5% ownership
interest in the McClean Lake Joint Venture ('MLJV'), which includes
unmined uranium deposits (with mining at McClean North deposit via
the MLJV's SABRE mining method having commenced in July 2025 using
the MLJV's SABRE mining method) and the McClean Lake uranium mill
(currently utilizing a portion of its licensed capacity to process
the ore from the Cigar Lake mine under a toll milling agreement),
plus a 25.17% interest in the Midwest Joint Venture Midwest Main
and Midwest A deposits, and a 70.55% interest in the Tthe Heldeth
T&#xFA;&#xE9; ('THT') and Huskie deposits on the Waterbury Lake
Property. The Midwest Main, Midwest A, THT and Huskie deposits are
located within 20 kilometres of the McClean Lake mill. Taken
together, Denison has direct ownership interests in properties
covering ~457,000 hectares in the Athabasca Basin
region.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 12px">
Additionally, through its 50% ownership of JCU (Canada) Exploration
Company, Limited ('JCU'), Denison holds interests in various
uranium project joint ventures in Canada, including the Millennium
project (JCU, 30.099%), the Kiggavik project (JCU, 33.8118%) and
Christie Lake (JCU, 34.4508%).</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px;">&#xA0;</font></div>
<div id="pgbrk" style="width: 100%; margin-left: 0px; text-indent: 0px; margin-right: 0px">
<div id="ftr">
<div style="text-align: left; width: 100%"><font style="font-family: Times New Roman; font-size: 11px">&#xA0;</font></div>
</div>
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<div id="hdr">
<div style="text-align: right; width: 100%"><font style="font-family: Times New Roman; font-size: 11px">&#xA0;</font></div>
</div>
</div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px;">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 12px">
In 2024, Denison celebrated its 70th year in uranium mining,
exploration, and development, which began in 1954 with Denison's
first acquisition of mining claims in the Elliot Lake region of
northern Ontario.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: left; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-family: Arial; font-size: 12px">
For more information, please contact</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px">David
Cates&#xA0;</font>&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;<font style="font-family: Arial; font-size: 12px">(416)
979-1991 ext. 362</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px">President and
Chief Executive Officer</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px">Geoff
Smith&#xA0;</font>&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;<font style="font-family: Arial; font-size: 12px">(416) 979-1991 ext.
358</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px">Vice President
Corporate Development &amp; Commercial</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px">Follow Denison on
X (formerly Twitter)</font>&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0;
&#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;&#xA0;&#xA0; &#xA0;
&#xA0;<font style="font-family: Arial; font-size: 12px">&#xA0;@DenisonMinesCo</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-style: italic; font-family: Arial; font-size: 12px">
About Skyharbour</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-style: italic; font-family: Arial; font-size: 12px">
Skyharbour holds an extensive portfolio of uranium exploration
projects in Canada's Athabasca Basin and is well positioned to
benefit from improving uranium market fundamentals with interest in
thirty-seven projects covering over 616,000 hectares (over 1.5
million acres) of land. Skyharbour has acquired from Denison, a
large strategic shareholder of Skyharbour, a 100% interest in the
Moore Uranium Project, which is located 15 kilometres east of
Denison's Wheeler River project and 39 kilometres south of Cameco's
McArthur River uranium mine. Moore is an advanced-stage uranium
exploration property with high-grade uranium mineralization in
several zones at the Maverick Corridor. Adjacent to the Moore
Project is the Russell Lake Uranium Project, which hosts widespread
uranium mineralization in drill intercepts over a large property
area with exploration upside potential. Skyharbour is actively
advancing these projects through exploration and drilling
programs.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="color: #000000; font-style: italic; font-family: Arial; font-size: 12px">
Skyharbour also has joint ventures with industry leaders Denison,
Orano Canada Inc., Azincourt Energy, and Thunderbird Resources at
the Russell, Preston, East Preston, and Hook Lake Projects,
respectively. Skyharbour also has several active earn-in option
partners, including CSE-listed Basin Uranium Corp. at the Mann Lake
Uranium Project; TSX-V listed North Shore Uranium at the Falcon
Project; UraEx Resources at the South Dufferin and Bolt Projects;
Hatchet Uranium at the Highway Project; CSE-listed Mustang Energy
at the 914W Project; and TSX-V listed Terra Clean Energy at the
South Falcon East Project.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Arial; font-size: 12px;">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-weight: bold; font-family: Arial; font-size: 12px">
Cautionary Statement Regarding Forward-Looking
Statements</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 11px">
Certain information contained in this news release constitutes
&#x2018;forward-looking information&#x2019;, within the meaning of
the applicable United States and Canadian legislation, concerning
the business, operations and financial performance and condition of
Denison. Generally, these forward-looking statements can be
identified by the use of forward-looking terminology such as
&#x2018;potential&#x2019;, &#x2018;plans&#x2019;,
&#x2018;expects&#x2019;, &#x2018;budget&#x2019;,
&#x2018;scheduled&#x2019;, &#x2018;estimates&#x2019;,
&#x2018;forecasts&#x2019;, &#x2018;intends&#x2019;,
&#x2018;anticipates&#x2019;, or &#x2018;believes&#x2019;, or the
negatives and/or variations of such words and phrases, or state
that certain actions, events or results &#x2018;may&#x2019;,
&#x2018;could&#x2019;, &#x2018;would&#x2019;, &#x2018;might&#x2019; or
&#x2018;will&#x2019; &#x2018;be taken&#x2019;, &#x2018;occur&#x2019; or
&#x2018;be achieved&#x2019;.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 11px">
In particular, this news release contains forward-looking
information pertaining to Denison's current intentions, objectives
and commitments with respect to the Transaction and the expected
benefits thereof; the Company&#x2019;s exploration, development and
expansion plans and objectives; and expectations regarding its
joint venture ownership interests and the continuity of its
agreements with its partners and third parties.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-family: Times New Roman; font-size: 13px">&#xA0;</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 11px">
Forward looking statements are based on the opinions and estimates
of management as of the date such statements are made, and they are
subject to known and unknown risks, uncertainties and other factors
that may cause the actual results, level of activity, performance
or achievements of Denison to be materially different from those
expressed or implied by such forward-looking statements. For
example, the parties to the Option Agreement may not complete the
option phases as described and/or the exploration objectives may
not be achieved. In addition, Denison may decide or otherwise be
required to discontinue testing, evaluation and other work on the
Company&#x2019;s other properties if it is unable to maintain or
otherwise secure the necessary resources (such as testing
facilities, capital funding, joint venture approvals, regulatory
approvals, etc.). Denison believes that the expectations reflected
in this forward-looking information are reasonable but no assurance
can be given that these expectations will prove to be accurate and
results may differ materially from those anticipated in this
forward-looking information. For a discussion in respect of risks
and other factors that could influence forward-looking events,
please refer to the factors discussed in Denison&#x2019;s Annual
Information Form dated March 28, 2025 under the heading &#x2018;Risk
Factors&#x2019; or in subsequent quarterly financial reports. These
factors are not, and should not be construed as being,
exhaustive.</font></div>
<div style="text-align: justify; margin-left: 0px; margin-right: 0px; text-indent: 0px">
<font style="font-style: italic; font-family: Arial; font-size: 11px">
Accordingly, readers should not place undue reliance on
forward-looking statements. The forward-looking information
contained in this news release is expressly qualified by this
cautionary statement. Any forward-looking information and the
assumptions made with respect thereto speaks only as of the date of
this news release. Denison does not undertake any obligation to
publicly update or revise any forward-looking information after the
date of this news release to conform such information to actual
results or to changes in Denison's expectations except as otherwise
required by applicable legislation.</font></div>
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