DNN / Denison Mines Corp. - Pemfailan SEC, Laporan Tahunan, Penyata Proksi

[Signature Page to [Base][Additional] Capped Call Confirmation]

Exhibit 99.3 BIDDING VERSION [Dealer Name and Address] [], 2025 To: Denison Mines Corp. 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada Re: [Base][Additional] Call Option Transaction The purpose of this letter agreement (this “Confirmation”) is to confirm the terms and conditions of the call option transaction entered into between [Dealer Name] (“Dealer”) and Denison Mines Corp. (“Counter

Denison Announces Closing of US$345 Million Convertible Senior Notes Offering

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Closing of US$345 Million Convertible Senior Notes Offering Toronto, ON – August 15, 2025 - Denison Mines Corp. (TSX: DML)(NYSE AMERICAN: DNN) (“Denison” or the “ Company”) is pleased to announce that it has closed its previously announced offering of convertible senio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 15, 2025 Commission File Number: 001-33414 Deni

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 15, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by che

DENISON MINES CORP. U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee Dated as of August 15, 2025 4.25% Convertible Senior Notes due 2031

DENISON MINES CORP. and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee INDENTURE Dated as of August 15, 2025 4.25% Convertible Senior Notes due 2031 TABLE OF CONTENTS Page ARTICLE 1 Definitions Section 1.01 Definitions 1 Section 1.02 Other Definitions 1 Section 1.03 References to Interest 1 ARTICLE 2 Issue, Description, Execution, Registration And Exchange Of Notes Section 2.01 Designati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 13, 2025 Commission File Number: 001-33414 Deni

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 13, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by che

Denison Announces Pricing of Upsized US$300 Million Convertible Senior Notes Offering

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Pricing of Upsized US$300 Million Convertible Senior Notes Offering Toronto, ON – August 13, 2025 - Denison Mines Corp. (TSX: DML)(NYSE AMERICAN: DNN) (“Denison” or the “Company”) announces that, on August 12, 2025, it upsized and priced its previously announced offeri

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 12, 2025 Commission File Number: 001-33414 Deni

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 12, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by che

Denison Announces Offering of US$250 Million of Convertible Senior Notes

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Offering of US$250 Million of Convertible Senior Notes Toronto, ON – August 12, 2025 - Denison Mines Corp. (TSX: DML) (NYSE AMERICAN: DNN) (“Denison” or the “Company”) announces that it is offering convertible senior unsecured notes due 2031 (the “ Notes”) in an aggreg

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2025 TABLE OF CONTENTS Q2 2025 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF CONTINUING OPERATIONS 5 Wheeler River Uranium Project 6 Evaluation Pipeline Properties 1

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2025 TABLE OF CONTENTS Q2 2025 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF CONTINUING OPERATIONS 5 Wheeler River Uranium Project 6 Evaluation Pipeline Properties 12 LIQUIDITY AND CAPITAL RESOURCES 24 DISCONTINUED OPERATIONS 26 OUTLOOK FOR 2025 26 ADDITIONAL INFORMATION 26 CAUTIONARY STATEMENT REGARD

Denison Reports Financial and Operational Results for Q2 2025, Highlighted by Return to Uranium Production at McClean Lake and Provincial Approval of Wheeler River Environmental Assessment

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for Q2 2025, Highlighted by Return to Uranium Production at McClean Lake and Provincial Approval of Wheeler River Environmental Assessment Toronto, ON – August 7, 2025. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE Ame

At June 30

Exhibit 99.1 INTERIM CONSOLIDATED FINANCIAL STATEMENTS CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At June 30 2025 At December 31 2024 ASSETS Current Cash and cash equivalents (note 4) $ 54,533 $ $108,518 Trade and other receivables 4,115 3,075 Inventories 4,102 3,746 Investments-equity in

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended June 30, 2025. 2. No misrepresentations: Based on my knowledge, h

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Elizabeth Sidle, Vice President Finance and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended June 30, 2025. 2. No misrepresentations: Based o

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 8, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 8, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

Denison Announces Results from Midwest ISR Preliminary Economic Assessment, Including After-Tax NPV of $965 Million

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Results from Midwest ISR Preliminary Economic Assessment, Including After-Tax NPV of $965 Million Toronto, ON – August 6, 2025. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE American) is pleased to report the results of the Preliminary Economic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 6, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 6, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 5, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 5, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

Denison Receives Provincial Environmental Assessment Approval for the Wheeler River Project

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Receives Provincial Environmental Assessment Approval for the Wheeler River Project Toronto, ON – August 5, 2025. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is pleased to announce that it has received Ministerial approval under The Environmen

Denison Announces Additional High-Grade Uranium Mineralization Discovered at McClean South

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Additional High-Grade Uranium Mineralization Discovered at McClean South Toronto, On – July 21, 2025. Denison Mines Corp. (“Denison” or the “Company”) (DML:TSX, DNN: NYSE American) is pleased to announce that several significant new intercepts of shallow high-grade ura

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 21, 2025 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 21, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 17, 2025 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 17, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Orano Canada and Denison Announce SABRE 1st Production at McClean Lake

Exhibit 99.1 NEWS RELEASE Orano Canada and Denison Announce SABRE 1st Production at McClean Lake Saskatoon, SK - July 17, 2025. Orano Canada Inc. (“Orano Canada”) and Denison Mines Corp. (“Denison”) (TSX: DML, NYSE American: DNN), as joint-venture partners in the McClean Lake Joint Venture (“MLJV”), are pleased to announce the successful start of uranium mining operations using the joint venture’s

Denison Announces Discovery of Additional High-Grade Mineralization at Gryphon and Reports Results from Successful Delineation Program

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Discovery of Additional High-Grade Mineralization at Gryphon and Reports Results from Successful Delineation Program Toronto, ON – July 16, 2025. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE American) is pleased to announce the discovery of add

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 16, 2025 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 16, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

DENISON MINES CORP. AMENDED AND RESTATED SHARE UNIT PLAN ARTICLE I

Exhibit 4.1 DENISON MINES CORP. AMENDED AND RESTATED SHARE UNIT PLAN ARTICLE I INTRODUCTION 1.1 Purpose of Plan This Plan provides for the granting of Share Unit Awards and payment in respect thereof through the issuance of one Share from treasury of the Company per Share Unit (subject to adjustments), subject to obtaining the approval of the Stock Exchanges and the Required Shareholder Approval,

As filed with the Securities and Exchange Commission on May 16, 2025

As filed with the Securities and Exchange Commission on May 16, 2025 Registration No.

Calculation of Filing Fee Tables Form S-8 (Form Type) Denison Mines Corp. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107.1 Calculation of Filing Fee Tables Form S-8 (Form Type) Denison Mines Corp. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities SecurityType SecurityClassTitle FeeCalculation Rule Amount Registered(1) Proposed Maximum Offering Price PerUnit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Shares, no par value Rul

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Elizabeth Sidle, Vice President Finance and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended March 31, 2025. 2. No misrepresentations: Based

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended March 31, 2025. 2. No misrepresentations: Based on my knowledge,

Denison Mines Corp. - Report of Voting Results

Exhibit 99.6 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo May 12, 2025 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

Denison Reports Financial and Operational Results for Q1 2025, Highlighted by Continued Advancement of the Phoenix Project, and the Results of its Shareholder Meeting

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for Q1 2025, Highlighted by Continued Advancement of the Phoenix Project, and the Results of its Shareholder Meeting Toronto, ON – May 12, 2025. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) today filed

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 14, 2025 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 14, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

At March 31

Exhibit 99.1 INTERIM CONSOLIDATED FINANCIAL STATEMENTS CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At March 31 2025 At December 31 2024 ASSETS Current Cash and cash equivalents (note 4) $ 83,576 $ 108,518 Trade and other receivables 3,802 3,075 Inventories 3,769 3,746 Investments-equity in

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE MONTHS ENDED MARCH 31, 2025

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE MONTHS ENDED MARCH 31, 2025 TABLE OF CONTENTS Q1 2025 PERFORMANCE HIGHLIGHTS ABOUT DENISON RESULTS OF CONTINUING OPERATIONS Wheeler River Uranium Project Evaluation Pipeline Properties LIQUIDITY AND CAPITAL RESOURCES DISCONTINUED OPERATIONS OUTLOOK FOR 2025 ADDITIONAL INFORMATION CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

8. This proxy should be read in conjunction with the accompanying documentation provided by Management. Fold Proxies submitted must be received by 11:30 a.m., Eastern Time, on May 8, 2025.

Exhibit 99.4 8th Floor, 100 University Avenue Toronto, Ontario M5J 2Y1 www.computershare.com Security Class Holder Account Number Fold Form of Proxy - Annual and Special Meeting to be held on May 12, 2025 This Form of Proxy is solicited by and on behalf of Management. Notes to proxy 1. Every holder has the right to appoint some other person or company of their choice, who need not be a holder, to

Denison Mines Corp. Annual General and Special Meeting of Shareholders Monday, May 12, 2025 Notice of Meeting & Management Information Circular Dated March 28, 2025

Exhibit 99.3 Denison Mines Corp. Annual General and Special Meeting of Shareholders Monday, May 12, 2025 Notice of Meeting & Management Information Circular Dated March 28, 2025 Dear Denison Shareholder, On behalf of the Board of Directors, I hereby provide notice to you of the annual general and special meeting (‘Meeting’) of shareholders of Denison Mines Corp. (‘Denison’ or the ‘Company’) Meetin

Notice of Annual General & Special Meeting of Shareholders

Exhibit 99.2 Notice of Annual General & Special Meeting of Shareholders You are hereby given notice of the Annual General & Special Meeting of the Shareholders of Denison Mines Corp. (“Denison” or the “Company”). When Where Monday, May 12, 2025 11:30 a.m. (Eastern Time) Please plan to vote in advance of the meeting. The offices of the Company 1100 – 40 University Avenue, Toronto, Ontario M5J 1T1 T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 8, 2025 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 8, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Notice and Access Notification to Shareholders Annual General & Special Meeting of Shareholders May 12, 2025

EX-99.1 2 notificationundernoticean.htm NOTICE AND ACCESS NOTIFICATION LETTER Exhibit 99.1 Notice and Access Notification to Shareholders Annual General & Special Meeting of Shareholders May 12, 2025 You are receiving this notification because Denison Mines Corp. (the “Company”) has opted to use the “notice and access” model for the delivery of its information circular (the “Circular”) to its shar

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 1, 2025 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 1, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Denison Announces Filing of Annual Report on Form 40-F

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Filing of Annual Report on Form 40-F Toronto, ON – March 28, 2025. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML, NYSE American: DNN) is pleased to announce that it has filed its 2024 Annual Report on Form 40-F with the U.S. Securities and Exchange Commiss

CONSENT OF ECOMETRIX INCORPORATED

Exhibit 99.20 CONSENT OF ECOMETRIX INCORPORATED 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection wi

CONSENT OF QUALIFIED PERSON

Exhibit 99.24 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

Consent of Independent Registered Public Accounting Firm

Exhibit 99.4 KPMG LLP Bay Adelaide Centre, 333 Bay Street, Suite 4600 Toronto, ON M5H 2S5 Telephone (416) 777-8500 Fax (416) 777-3969 www.kpmg.ca Consent of Independent Registered Public Accounting Firm The Board of Directors Denison Mines Corp. We consent to the use of: ●our report dated March 13, 2025, on the consolidated financial statements of Denison Mines Corp (the “Entity”), which comprise

ANNUAL CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2024

Exhibit 99.3 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2024 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS Responsibility for Financial Statements The Company’s management is responsible for the integrity and fairness of presentation of these consolidated financial statements. The consolidated financial statements have been prepared by management, in accordance with Intern

CONSENT OF QUALIFIED PERSON

Exhibit 99.11 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

Denison Mines Corp. 2024 Annual Information Form March 28, 2025

Exhibit 99.1 Denison Mines Corp. 2024 Annual Information Form March 28, 2025 About this Annual Information Form This annual information form (“AIF”) is dated March 28, 2025. Information in this AIF is stated as at December 31, 2024 unless specified otherwise. In this AIF, references to the “Company” or “Denison” refer to Denison Mines Corp., its subsidiaries and affiliates, or any one of them, as

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

Exhibit 99.7 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 In connection with the Annual Report of Denison Mines Corp. (the “Company”) on Form 40-F for the period ended December 31, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned certifies, pursuant to 18 U.S.C. 1350, and SEC Rule 13a-14(b), that to the best of my knowledge:

REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a)

Exhibit 99.6 CERTIFICATION REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a) I, Elizabeth Sidle, certify that: 1. I have reviewed this annual report on Form 40-F of Denison Mines Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

CONSENT OF QUALIFIED PERSON

Exhibit 99.18 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a)

Exhibit 99.5 CERTIFICATION REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a) I, David D. Cates, certify that: 1. I have reviewed this annual report on Form 40-F of Denison Mines Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 40-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 40-F (Check One) ☐ Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 ☒ Annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2024 Commission file number: 001-33414 DENISON MINES CORP. (Exact name of registrant as s

CONSENT OF QUALIFIED PERSON

Exhibit 99.22 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT OF QUALIFIED PERSON

Exhibit 99.15 CONSENT OF QUALIFIED PERSON Ladies and Gentlemen: Wood Canada Limited (“Wood”) consents to (1) the references to Wood’s name included or incorporated by reference in the Annual Report on Form 40-F of Denison Mines Corp. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the sect

CONSENT OF QUALIFIED PERSON

Exhibit 99.23 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT OF QUALIFIED PERSON

Exhibit 99.21 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT

Exhibit 99.9 SRK Consulting (Canada) Inc. 1500, 155 University Avenue Toronto, Ontario, Canada M5H 3B7 T: +1.416.601.1445 F: +1.416.601.9046 [email protected] www.srk.com CONSENT Ladies and Gentlemen: The undersigned hereby consents to: (1) the references of Cliff Revering, who was a former employee of SRK Consulting (Canada) Inc. (“SRK”) at the time mentioned below, included or incorporated by refe

CONSENT OF QUALIFIED PERSON

Exhibit 99.16 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT OF QUALIFIED PERSON

Exhibit 99.19 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2024

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2024 TABLE OF CONTENTS 2024 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 4 RESULTS OF CONTINUING OPERATIONS 8 Wheeler River Uranium Project 10 LIQUIDITY AND CAPITAL RESOURCES 24 DISCONTINUED OPERATIONS 30 OUTLOOK FOR 2025 30 ADDITIONAL INFORMATION 32 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 45 This

CONSENT OF ENGINEER

Exhibit 99.10 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the report

Consent of Qualified Person

Exhibit 99.14 SLR International Corporation 1658 Cole Blvd, Suite 100, Lakewood, Colorado, 80401 Consent of Qualified Person 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224

CONSENT OF QUALIFIED PERSON

Exhibit 99.17 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

Consent of Qualified Person

Exhibit 99.13 SLR Consulting (Canada) Ltd. 55 University Ave., Suite 501, Toronto, ON M5J 2H7 Consent of Qualified Person 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641

CONSENT

Exhibit 99.8 CONSENT 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), and (2) all other references to the undersi

CONSENT OF QUALIFIED PERSON

Exhibit 99.12 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

TWELFTH AMENDING AGREEMENT TO FOURTH AMENDED AND RESTATED CREDIT AGREEMENT

EX-99.1 2 twelfthamendingagreement.htm MATERIAL AGREEMENT Exhibit 99.1 TWELFTH AMENDING AGREEMENT TO FOURTH AMENDED AND RESTATED CREDIT AGREEMENT THIS AGREEMENT dated as of the 18th day of December, 2024. BETWEEN: THE BANK OF NOVA SCOTIA, a Canadian chartered bank (herein, in its capacity as administrative agent for the Lenders, called the “Administrative Agent”) - and - DENISON MINES INC., a corp

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 27, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 27, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 20, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 20, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

Denison Announces Appointment of Former OPG CEO Ken Hartwick to its Board of Directors

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Appointment of Former OPG CEO Ken Hartwick to its Board of Directors Toronto, ON – March 20, 2025. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML, NYSE American: DNN) is pleased to announce the appointment of Ken Hartwick, who previously served as the CEO o

Denison Reports Financial and Operational Results for 2024 Highlighted by Significant Advancement of the Phoenix Project

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for 2024 Highlighted by Significant Advancement of the Phoenix Project Toronto, ON – March 13, 2025. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) today filed its Audited Consolidated Financial Statement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 17, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 17, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 14, 2025 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 14, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto ON M5J 1T1 Canada (Address of principal executive offices) Indicate by check mar

4th Specified Trading Period (dd/mm/yy) (refer to the definition of “specified trading period” under OSC Rule 13-502 Fees ) 10/1/2024 to 12/31/2024 Closing price of the security in the class or series on the last trading day of the specified trading

Exhibit 99.4 I, , (s) Name: Date Title: Reporting Issuer Name: End date of previous financial year: Type of Reporting Issuer: Highest Trading Marketplace: (refer to the definition of “highest trading marketplace” under OSC Rule 13-502 Fees) Market value of listed or quoted securities: (in Canadian Dollars - refer to section 7.1 of OSC Rule 13-502 Fees) Equity Symbol 1st Specified Trading Period (d

ANNUAL CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2024

Exhibit 99.1 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2024 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS Responsibility for Financial Statements The Company’s management is responsible for the integrity and fairness of presentation of these consolidated financial statements. The consolidated financial statements have been prepared by management, in accordance with Intern

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2024

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2024 TABLE OF CONTENTS 2024 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 4 RESULTS OF CONTINUING OPERATIONS 8 Wheeler River Uranium Project 10 LIQUIDITY AND CAPITAL RESOURCES 24 DISCONTINUED OPERATIONS 30 OUTLOOK FOR 2025 30 ADDITIONAL INFORMATION 32 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 45 This

Consent of Independent Registered Public Accounting Firm

Exhibit 99.3 Consent of Independent Registered Public Accounting Firm We consent to the incorporation by reference in the Registration Statements on Form S-8 (File No. 333-48174, No. 333-148915, No. 333-190121 and No. 333-224641), of our reports dated March 13, 2025 with respect to the consolidated financial statements of Denison Mines Corp. (the “Entity”), which comprise the consolidated statemen

Number of securities in the class or series of such security outstanding at the end of the last trading day of the specified trading period 892,002,706 (ii) Market value of class or series (i) x (ii) $ 2,363,807,170.90 (A) 2nd Specified Trading Perio

Exhibit 99.5 Title: Vice President Legal & Corporate Secretary March 7, 2025 Date: (Signed) "Amanda Willett" Name: Amanda Willett I, Amanda Willett , an officer of the reporting issuer noted below have examined this Form 13-501F1 (the Form) being submitted hereunder to the Alberta Securities Commission and certify that to my knowledge, having exercised reasonable diligence, the information provide

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 27, 2025 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 27, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

Denison Reports CNSC Hearing Dates for Phoenix ISR Project

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports CNSC Hearing Dates for Phoenix ISR Project Toronto, ON – February 27, 2025. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML, NYSE American: DNN) is pleased to announce that the Canadian Nuclear Safety Commission (“CNSC”) Registrar has set the schedule for the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 27, 2025 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 27, 2025 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

February 21, 2025

Exhibit 99.1 February 21, 2025 Computershare 100 University Avenue, 8th floor Toronto ON, M5J 2Y1 www.computershare.com To: All Canadian Securities Regulatory Authorities Subject: DENISON MINES CORP. Dear Sir/Madam: We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer: Meeting Type : Annual and Special General Meeting Record Date for Notice of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 27, 2024 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 27, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

Denison Announces Agreement to Form Exploration Joint Ventures with Cosa Resources

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Agreement to Form Exploration Joint Ventures with Cosa Resources Toronto, ON – November 27, 2024. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is pleased to announce that is has executed an agreement (the “Agreement”) with Cosa Resour

Denison Files Final Wheeler River Environmental Impact Statement with CNSC Following Completion of Technical Review

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Files Final Wheeler River Environmental Impact Statement with CNSC Following Completion of Technical Review Toronto, ON – November 25, 2024. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is pleased to announce that it has filed a final Environme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 25, 2024 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 25, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

DNN / Denison Mines Corp. / Global X Management CO LLC - SC 13G/A Passive Investment

SC 13G/A 1 ef20038661sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G INFORMATION STATEMENT TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b) (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 (b) (Amendment No. 2)* Denison Mines Corp. (Name of Issuer) Common Shares (Title of Class of Securities) 248356107 (CUSIP Num

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended September 30, 2024. 2. No misrepresentations: Based on my knowled

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 8, 2024 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 8, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Elizabeth Sidle, Vice President Finance and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended September 30, 2024. 2. No misrepresentations: Ba

At September 30

Exhibit 99.1 INTERIM CONSOLIDATED FINANCIAL STATEMENTS CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At September 30 2024 At December 31 2023 ASSETS Current Cash and cash equivalents (note 4) $ 105,933 $ 131,054 Trade and other receivables 3,354 1,913 Inventories 3,644 3,580 Investments-equi

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2024 TABLE OF CONTENTS Q3 2024 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF CONTINUING OPERATIONS 4 Wheeler River Uranium Project 6 LIQUIDITY AND CAPITAL RESO

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2024 TABLE OF CONTENTS Q3 2024 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF CONTINUING OPERATIONS 4 Wheeler River Uranium Project 6 LIQUIDITY AND CAPITAL RESOURCES 20 DISCONTINUED OPERATIONS 22 OUTLOOK FOR 2024 23 ADDITIONAL INFORMATION 23 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMEN

Denison Reports Financial and Operational Results for Q3’2024, Including Positive Progress on Phoenix Engineering and Regulatory Review

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for Q3’2024, Including Positive Progress on Phoenix Engineering and Regulatory Review Toronto, ON – November 7, 2024. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) today filed its Condensed Consolidated

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Denison Mines Corp. (Exact name of the registrant as specified in its charter) Ontario, Canada 001-33414 98-0622284 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 1100 – 40 University Avenue Toronto, Ontario M5J

Extractive Sector Transparency Measures Act - Annual Report

EXHIBIT 2.01 Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Denison Mines Corp. Reporting Year From 1/1/2023 To: 12/31/2023 Date submitted 5/30/2024 Reporting Entity ESTMA Identification Number E948571 ◉ Original Submission ❍ Amended Report Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity In accordance

XBRL TAXONOMY EXTENSION SCHEMA

Wheeler Other Saskatchewan Projects Elliot Lake Government of Canada Canada English River First Nation Kineepik Metis Local Yathi Nene Lands and Resources Office Uranium

XBRL INSTANCE DOCUMENT

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: September 24, 2024 Commission File Number: 001-33414 D

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: September 24, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by

Denison Announces Option of Non-Core Exploration Projects to Foremost for up to $30 Million in Combined Consideration

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Option of Non-Core Exploration Projects to Foremost for up to $30 Million in Combined Consideration Toronto, ON – September 24, 2024. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is pleased to announce that is has executed an option a

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended June 30, 2024. 2. No misrepresentations: Based on my knowledge, h

Denison CEO Highlights Phoenix Post-Feasibility Study Progress and Company Reports Financial and Operational Results for Q2’2024

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison CEO Highlights Phoenix Post-Feasibility Study Progress and Company Reports Financial and Operational Results for Q2’2024 Toronto, ON – August 8, 2024. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) today filed its Condensed Consolidated Financial

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2024 TABLE OF CONTENTS Q2 2024 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF CONTINUING OPERATIONS 4 Wheeler River Uranium Project 6 LIQUIDITY AND CAPITAL RESOURCES

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2024 TABLE OF CONTENTS Q2 2024 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF CONTINUING OPERATIONS 4 Wheeler River Uranium Project 6 LIQUIDITY AND CAPITAL RESOURCES 18 DISCONTINUED OPERATIONS 20 OUTLOOK FOR 2024 20 ADDITIONAL INFORMATION 21 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 21

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 9, 2024 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 9, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Elizabeth Sidle, Vice President Finance and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended June 30, 2024. 2. No misrepresentations: Based o

At June 30

Exhibit 99.1 INTERIM CONSOLIDATED FINANCIAL STATEMENTS CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At June 30 2024 At December 31 2023 ASSETS Current Cash and cash equivalents (note 4) $ 121,067 $ 131,054 Trade and other receivables 2,422 1,913 Inventories 3,207 3,580 Investments-equity in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 12, 2024 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: July 12, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Denison Announces Signing of Wheeler River Benefit Agreements with Kineepik Métis Local #9 and the Village of Pinehouse Lake

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Signing of Wheeler River Benefit Agreements with Kineepik Métis Local #9 and the Village of Pinehouse Lake Toronto, ON – July 11, 2024. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is honoured to announce the signing of a Mutual Benef

Denison Announces Completion of Inaugural ISR Field Test Program at Midwest

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Completion of Inaugural ISR Field Test Program at Midwest Toronto, ON – June 3, 2024. Denison Mines Corp. (“Denison”) (TSX: DML; NYSE American: DNN) is pleased to announce it has completed the inaugural In-Situ Recovery (“ISR”) field test program (the “Program”) at Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: June 3, 2024 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: June 3, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Denison Announces Results of Shareholder Meeting & Appointment of Jennifer Traub as Board Chair

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Results of Shareholder Meeting & Appointment of Jennifer Traub as Board Chair Toronto, ON – May 9, 2024. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) is pleased to report that the nominees listed in the management proxy circular dated

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 9, 2024 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 9, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check m

Denison Mines Corp. - Report of Voting Results

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 (

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Elizabeth Sidle, Vice President Finance and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended March 31, 2024. 2. No misrepresentations: Based

Denison Reports Financial and Operational Results for Q1 2024

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for Q1 2024 Toronto, ON – May 8, 2024. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) today filed its Condensed Consolidated Financial Statements and Management’s Discussion & Analysis (‘MD&A’) for the qu

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE MONTHS ENDED MARCH 31, 2024 TABLE OF CONTENTS Q1 2024 PERFORMANCE HIGHLIGHTS ABOUT DENISON RESULTS OF OPERATIONS Wheeler River Uranium Project LIQUIDITY AND CAPITAL RESOURCES DISCONTINUED OPERATIONS OU

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE MONTHS ENDED MARCH 31, 2024 TABLE OF CONTENTS Q1 2024 PERFORMANCE HIGHLIGHTS ABOUT DENISON RESULTS OF OPERATIONS Wheeler River Uranium Project LIQUIDITY AND CAPITAL RESOURCES DISCONTINUED OPERATIONS OUTLOOK FOR 2024 ADDITIONAL INFORMATION CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 2 3 4 6 18 20 21 21 22 This Management’s

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended March 31, 2024. 2. No misrepresentations: Based on my knowledge,

At March 31

Exhibit 99.1 INTERIM CONSOLIDATED FINANCIAL STATEMENTS CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At March 31 2024 At December 31 2023 ASSETS Current Cash and cash equivalents (note 4) $ 120,294 $ 131,054 Trade and other receivables (note 5) 2,407 1,913 Inventories (note 6) 3,100 3,580 In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 9, 2024 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 9, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check m

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 9, 2024 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 9, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check m

EX-99.5

Notice and Access Notification to Shareholders Annual General Meeting of Shareholders May 9, 2024

Exhibit 99.1 Notice and Access Notification to Shareholders Annual General Meeting of Shareholders May 9, 2024 You are receiving this notification because Denison Mines Corp. (the “Company”) has opted to use the “notice and access” model for the delivery of its information circular (the “Circular”) to its shareholders in respect of its annual general meeting of shareholders to be held on May 9, 20

Denison Mines Corp. Annual General Meeting of Shareholders Thursday, May 9, 2024 Notice of Meeting & Management Information Circular Dated March 28, 2024

Exhibit 99.3 Denison Mines Corp. Annual General Meeting of Shareholders Thursday, May 9, 2024 Notice of Meeting & Management Information Circular Dated March 28, 2024 Dear Denison Shareholder, On behalf of the Board of Directors, I hereby provide notice to you of the annual general meeting of shareholders of Denison Mines Corp. (‘Denison’ or the ‘Company’) to be held on Thursday, May 9, 2024 at th

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 8, 2024 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 8, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

8. This proxy should be read in conjunction with the accompanying documentation provided by Management. Fold Proxies submitted must be received by 11:30 a.m., Eastern Time, on May 7, 2024.

Exhibit 99.4 8th Floor, 100 University Avenue Toronto, Ontario M5J 2Y1 www.computershare.com Security Class Holder Account Number Fold Form of Proxy - Annual General Meeting to be held on May 9, 2024 This Form of Proxy is solicited by and on behalf of Management. Notes to proxy 1. Every holder has the right to appoint some other person or company of their choice, who need not be a holder, to atten

NOTICE OF ANNUAL GENERAL MEETING OF SHAREHOLDERS

Exhibit 99.2 NOTICE OF ANNUAL GENERAL MEETING OF SHAREHOLDERS You are hereby given notice of Denison Mines Corp.’s Annual General Meeting of Shareholders. When Where Thursday, May 9, 2024 11:30 a.m. (Eastern Time) Please plan to vote in advance of the meeting The offices of the Company 1100 - 40 University Avenue Toronto, Ontario M5J 1T1 There will be no reception, presentation or refreshments The

Denison Announces Filing of Annual Report on Form 40-F

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo PRESS RELEASE Denison Announces Filing of Annual Report on Form 40-F Toronto, ON – March 28, 2024 Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML; NYSE American: DNN) is pleased to announce that it has filed its 2023 Annual Report on Form 40-F with the U.S. Securities and E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 1, 2024 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 1, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

CONSENT OF QUALIFIED PERSON

Exhibit 99.18 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT

Exhibit 99.11 SRK Consulting (Canada) Inc. 1500, 155 University Avenue Toronto, Ontario, Canada M5H 3B7 T: +1.416.601.1445 F: +1.416.601.9046 [email protected] www.srk.com CONSENT 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. and the registration stat

CONSENT OF QUALIFIED PERSON

Exhibit 99.14 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

CONSENT OF QUALIFIED PERSON

Exhibit 99.27 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

CONSENT OF ENGINEER

Exhibit 99.13 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a) the rep

CONSENT

Exhibit 99.10 SRK Consulting (Canada) Inc. 1500, 155 University Avenue Toronto, Ontario, Canada M5H 3B7 T: +1.416.601.1445 F: +1.416.601.9046 [email protected] www.srk.com CONSENT 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. and the registration stat

CONSENT OF QUALIFIED PERSON

Exhibit 99.30 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

CONSENT OF QUALIFIED PERSON

Exhibit 99.23 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

  Denison Mines Corp. CLAWBACK POLICY

  Exhibit 97.1     1.             Introduction   1.1            Adopted. Upon the recommendation of the Compensation Committee of the Board of Directors (the “Board”) of Denison Mines Corp. (the “Company”), the Board has adopted this Clawback Policy effective October 2, 2023 (the “Effective Date”).   1.2            Purpose. The purpose of this Policy is to provide for the recoupment of certain inc

CONSENT

Exhibit 99.9 CONSENT 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), and (2) all other references to the undersi

CONSENT OF QUALIFIED PERSON

Exhibit 99.19 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT OF QUALIFIED PERSON

Exhibit 99.24 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

CONSENT

Exhibit 99.17 CONSENT Ladies and Gentlemen: Wood Canada Limited (“Wood”) consents to (1) the references to Wood’s name included or incorporated by reference in the Annual Report on Form 40-F of Denison Mines Corp. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the sections of the report e

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 40-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 40-F (Check One) ¨ Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 x Annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended: December 31, 2023 Commission file number: 001-33414 DENISON MINES CORP. (Exact name of registrant as s

CONSENT OF QUALIFIED PERSON

Exhibit 99.26 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

ELEVENTH AMENDING AGREEMENT TO FOURTH AMENDED AND RESTATED CREDIT AGREEMENT

Exhibit 99.1 ELEVENTH AMENDING AGREEMENT TO FOURTH AMENDED AND RESTATED CREDIT AGREEMENT THIS AGREEMENT dated as of the 21st day of December, 2023. BETWEEN: THE BANK OF NOVA SCOTIA, a Canadian chartered bank (herein, in its capacity as administrative agent for the Lenders, called the “Administrative Agent”) - and - DENISON MINES INC., a corporation amalgamated under the laws of the Province of Ont

KPMG LLP

Exhibit 99.4 KPMG LLP Bay Adelaide Centre 333 Bay Street, Suite 4600 Toronto, ON M5H 2S5 Telephone (416) 777-8500 Fax (416) 777-3969 www.kpmg.ca Consent of Independent Registered Public Accounting Firm The Board of Directors Denison Mines Corp. We consent to the use of: · our report dated February 29, 2024 on the consolidated financial statements of Denison Mines Corp. (the “Entity”), which compri

Consent of Qualified Person

Exhibit 99.15 SLR Consulting (Canada) Ltd. 55 University Ave., Suite 501, Toronto, ON M5J 2H7 Consent of Qualified Person 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641

CONSENT OF QUALIFIED PERSON

Exhibit 99.22 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CONSENT OF QUALIFIED PERSON

Exhibit 99.28 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

Denison Mines Corp. 2023 Annual Information Form March 28, 2024

Exhibit 99.1 Denison Mines Corp. 2023 Annual Information Form March 28, 2024 About this Annual Information Form This annual information form (“AIF”) is dated March 28, 2024. Information in this AIF is stated as at December 31, 2023 unless specified otherwise. In this AIF, references to the “Company” or “Denison” refer to Denison Mines Corp., its subsidiaries and affiliates, or any one of them, as

CONSENT OF QUALIFIED PERSON

Exhibit 99.29 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

CONSENT OF GEOLOGIST

Exhibit 99.12 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), including in connection with

CONSENT OF QUALIFIED PERSON

Exhibit 99.20 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

Exhibit 99.7 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 In connection with the Annual Report of Denison Mines Corp. (the “Company”) on Form 40-F for the period ended December 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned certifies, pursuant to 18 U.S.C. 1350, and SEC Rule 13a-14(b), that to the best of my knowledge:

REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a)

Exhibit 99.6 CERTIFICATION REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a) I, Elizabeth Sidle, certify that: 1. I have reviewed this annual report on Form 40-F of Denison Mines Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a)

Exhibit 99.5 CERTIFICATION REQUIRED BY RULE 13a-14(a) OR RULE 15d-14(a) I, David D. Cates, certify that: 1. I have reviewed this annual report on Form 40-F of Denison Mines Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

CONSENT OF QUALIFIED PERSON

Exhibit 99.25 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with (a)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 28, 2024 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 28, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

Consent of Qualified Person

Exhibit 99.16 SLR International Corporation 1658 Cole Blvd, Suite 100, Lakewood, Colorado, 80401 Consent of Qualified Person 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224

CONSENT

Exhibit 99.8 CONSENT 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), including in connection with the report ent

CONSENT OF QUALIFIED PERSON

Exhibit 99.21 CONSENT OF QUALIFIED PERSON 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. and the registration statements on Forms S-8 (File Nos. 333-190121 and 333-224641) of Denison Mines Corp. (the “Registration Statements”), in connection with the

Denison Announces Signing of Sustainable Communities Investment Agreement

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo PRESS RELEASE Denison Announces Signing of Sustainable Communities Investment Agreement Toronto, ON – March 27, 2024. Denison Mines Corp. (“Denison”) (TSX: DML; NYSE American: DNN) is proud to announce the signing of a Sustainable Communities Investment Agreement (the “Agreement”) wit

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 27, 2024 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 27, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by chec

Denison Reports Impressive Financial and Operational Results for 2023 Including Significant Increase in Phoenix ISR Project Economics and a $134 Million Gain on Physical Uranium Holdings

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Impressive Financial and Operational Results for 2023 Including Significant Increase in Phoenix ISR Project Economics and a $134 Million Gain on Physical Uranium Holdings Toronto, ON – February 29, 2024. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE Am

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 1, 2024 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 1, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Number of securities in the class or series of such security outstanding at the end of the last trading day of the specified trading period 835,381,534 (ii) Market value of class or series (i) x (ii) $ 1,228,010,854.98 (A) 2nd Specified Trading Perio

Exhibit 99.5 Title: Vice President Legal & Corporate Secretary Feb 29, 2024 Date: (Signed) "Amanda Willett" Name: Amanda Willett I, Amanda Willett , an officer of the reporting issuer noted below have examined this Form 13-501F1 (the Form) being submitted hereunder to the Alberta Securities Commission and certify that to my knowledge, having exercised reasonable diligence, the information provided

ANNUAL CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2023

Exhibit 99.1 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2023 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS Responsibility for Financial Statements The Company’s management is responsible for the integrity and fairness of presentation of these consolidated financial statements. The consolidated financial statements have been prepared by management, in accordance with Intern

4th Specified Trading Period (dd/mm/yy) (refer to the definition of “specified trading period” under OSC Rule 13-502 Fees ) 10/1/2023 to 12/31/2023 Closing price of the security in the class or series on the last trading day of the specified trading

Exhibit 99.4 I, , (s) Name: Date Title: Reporting Issuer Name: End date of previous financial year: Type of Reporting Issuer: Highest Trading Marketplace: (refer to the definition of “highest trading marketplace” under OSC Rule 13-502 Fees) Market value of listed or quoted securities: (in Canadian Dollars - refer to section 7.1 of OSC Rule 13-502 Fees) Equity Symbol 1st Specified Trading Period (d

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 1, 2024 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: March 1, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto ON M5J 1T1 Canada (Address of principal executive offices) Indicate by check mark

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE YEAR ENDED DECEMBER 31, 2023

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE YEAR ENDED DECEMBER 31, 2023 TABLE OF CONTENTS 2023 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 5 RESULTS OF OPERATIONS 10 Wheeler River Uranium Project 11 Evaluation Pipeline Properties 20 Community Engagement Activities 21 LIQUIDITY AND CAPITAL RESOURCES 29 OUTLOOK FOR 2024 36 ADDITIONAL INFORMATION 38 CAUTIONARY STATEMENT REGARDING FORWARD-LOOK

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 99.3 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in the Registration Statements on Form S-8 (File No. 333-48174, No. 333-148915, No. 333-190121 and No. 333-224641), of our reports dated February 29, 2024 with respect to the consolidated financial statements of Denison Mines Corp. (the “Entity”), which comprise the consolidated state

February 22, 2024

Exhibit 99.1 February 22, 2024 Computershare 100 University Avenue, 8th floor Toronto ON, M5J 2Y1 www.computershare.com To: All Canadian Securities Regulatory Authorities Subject: DENISON MINES CORP. Dear Sir/Madam: We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer: Meeting Type : Annual General Meeting Record Date for Notice of Meeting : Ma

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 28, 2024 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 28, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

Denison Announces Exclusive Acquisition of MaxPERF Tool Systems, Enhancing Denison’s Leadership in ISR Mining in the Athabasca Basin

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Exclusive Acquisition of MaxPERF Tool Systems, Enhancing Denison’s Leadership in ISR Mining in the Athabasca Basin Toronto, ON – February 26, 2024. Denison Mines Corp. (“Denison”) (TSX: DML, NYSE American: DNN) is pleased to announce that it has completed an acquisitio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 26, 2024 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: February 26, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

DNN / Denison Mines Corp. / Global X Management CO LLC - SC 13G URA/DENISON MINES CORP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G INFORMATION STATEMENT TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b) (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 (b) Denison Mines Corp. (Name of Issuer) Common Shares (Title of Class of Securities) 248356107 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing

DNN / Denison Mines Corp. / MMCAP International Inc. SPC - FORM SC 13G/A Passive Investment

SC 13G/A 1 formsc13ga.htm FORM SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2) Denison Mines Corp. (Name of Issuer) Common Shares (Title of Class of Securities) 248356107 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of This Statement) Check the Appropriate box to designa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: January 24, 2024 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: January 24, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

Orano Canada and Denison Announce JV Approval to Restart McClean Lake Mining Operations

Exhibit 99.1 NEWS RELEASE Orano Canada and Denison Announce JV Approval to Restart McClean Lake Mining Operations January 24, 2024. Orano Canada Inc. (“Orano Canada”), and Denison Mines Corp. (“Denison”) (TSX: DML, NYSE American: DNN), as joint-venture partners in the McClean Lake Joint Venture (“MLJV”), are pleased to announce that the MLJV has approved a restart of uranium mining operations usin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: January 23, 2024 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: January 23, 2024 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

Denison Announces $16 Million Contract Award to Wood for Completion of Detailed Design Engineering for Flagship Phoenix ISR Project

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces $16 Million Contract Award to Wood for Completion of Detailed Design Engineering for Flagship Phoenix ISR Project Toronto, ON – January 22, 2024. Denison Mines Corp. (“Denison”) (TSX: DML, NYSE American: DNN) is pleased to announce the award to Wood Canada Limited (“Wo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: December 18, 2023 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: December 18, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

Denison Reports Appointment of Elizabeth Sidle as CFO and Addition of Geoff Smith to Executive Team

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Appointment of Elizabeth Sidle as CFO and Addition of Geoff Smith to Executive Team Toronto, ON – December 18, 2023. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML, NYSE American: DNN) is pleased to announce the appointment of Ms. Elizabeth Sidle to the posit

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2023 TABLE OF CONTENTS Q3 2023 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF OPERATIONS 5 Wheeler River Uranium Project 7 Evaluation Pipeline Properties 16 Com

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2023 TABLE OF CONTENTS Q3 2023 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 3 RESULTS OF OPERATIONS 5 Wheeler River Uranium Project 7 Evaluation Pipeline Properties 16 Community Engagement Activities 17 LIQUIDITY AND CAPITAL RESOURCES 24 OUTLOOK FOR 2023 26 ADDITIONAL INFORMATION 27 CAUTIONARY STATEMENT REG

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 8, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 8, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

Denison Reports Financial Results from Q3'2023, Including EPS of $0.07 Driven by Significant Gains on Physical Uranium Holdings

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial Results from Q3'2023, Including EPS of $0.07 Driven by Significant Gains on Physical Uranium Holdings Toronto, ON – November 8, 2023. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) has filed its Condensed Consolidated Financial

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended September 30, 2023. 2. No misrepresentations: Based on my knowled

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Elizabeth Sidle, Vice President Finance and Interim Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended September 30, 2023. 2. No misrepresentat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 9, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 9, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

At September 30

Exhibit 99.1 INTERIM CONSOLIDATED FINANCIAL STATEMENTS CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At September 30 2023 At December 31 2022 ASSETS Current Cash and cash equivalents (note 4) $ 60,839 $ 50,915 Trade and other receivables (note 5) 5,648 4,143 Inventories (note 6) 3,296 2,713

Denison Announces Successful Completion of Inaugural ISR Field Test Program at Tthe Heldeth Túé (THT)

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Successful Completion of Inaugural ISR Field Test Program at Tthe Heldeth Túé (THT) Toronto, ON – November 6, 2023. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is pleased to announce the successful completion of the inaugural In-Situ

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 6, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 6, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 2, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: November 2, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

Denison Announces Successful Completion of Recovered Solution Management Phase of Phoenix ISR Feasibility Field Test

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Successful Completion of Recovered Solution Management Phase of Phoenix ISR Feasibility Field Test Toronto, ON – November 2, 2023. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML; NYSE American: DNN) is pleased to announce the successful completion of the re

FORM 51-102F3 MATERIAL CHANGE REPORT

Exhibit 99.1 FORM 51-102F3 MATERIAL CHANGE REPORT Item 1: Name and Address of Company Denison Mines Corp. (“Denison” or the “Company”) 1100 – 40 University Avenue Toronto, ON M5J 1T1 Item 2: Dates of Material Change October 10, 2023 and October 16, 2023 Item 3: News Release News releases announcing the material change were disseminated on October 10, 2023 and October 16, 2023 through the facilitie

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 17, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 17, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 16, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 16, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by ch

Denison Completes US$55 Million Offering to Fund Long-Lead Procurement for Phoenix ISR Project

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Completes US$55 Million Offering to Fund Long-Lead Procurement for Phoenix ISR Project Toronto, ON – October 16, 2023. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE American) is pleased to announce that today it has closed the previously announced bought

PROSPECTUS SUPPLEMENT To a Short Form Base Shelf Prospectus dated September 16, 2021

TABLE OF CONTENTS  Filed Pursuant to General Instruction II.L. of Form F-10  File No. 333-258939 No securities regulatory authority has expressed an opinion about these securities and it is an offence to claim otherwise. This prospectus supplement, together with the short form base shelf prospectus dated September 16, 2021 to which it relates, as amended or supplemented, and each document incorpor

UNDERWRITING AGREEMENT

Exhibit 99.1 UNDERWRITING AGREEMENT October 11, 2023 Denison Mines Corp. 40 University Avenue, Suite 1100 Toronto, Ontario Canada M5J 1T1 Attention: Mr. David Cates President and Chief Executive Officer Dear Sirs/Mesdames: Cantor Fitzgerald Canada Corporation (“CFCC” or, the “Lead Underwriter”), as sole bookrunner and lead underwriter, along with Canaccord Genuity Corp., Haywood Securities Inc., R

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 11, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 11, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto, Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

Bought Deal Public Offering of Common Shares

Filed pursuant to Rule 433 Registration Statement No. 333-258939 Issuer Free Writing Prospectus dated October 10, 2023 Relating to Prospectus Supplement dated October 10, 2023 (To Prospectus dated September 16, 2021) Bought Deal Public Offering of Common Shares A short form base shelf prospectus dated September 16, 2021 containing important information relating to the securities described in this

Subject to completion, dated October 10, 2023

TABLE OF CONTENTS  Filed Pursuant to General Instruction II.L. of Form F-10  File No. 333-258939 Subject to completion, dated October 10, 2023 No securities regulatory authority has expressed an opinion about these securities and it is an offence to claim otherwise. This prospectus supplement, together with the short form base shelf prospectus dated September 16, 2021 to which it relates, as amend

Denison Announces US$55 Million Bought Deal Offering

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces US$55 Million Bought Deal Offering Toronto, ON – October 10, 2023 Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE American) is pleased to announce that it has entered into an agreement with Cantor Fitzgerald Canada Corporation, as sole book-runner

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 10, 2023 Commission File Number: 001-33414 Den

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 10, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto, Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 6, 2023 Commission File Number: 001-33414 Deni

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: October 6, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by che

Denison Announces $15 million Strategic Investment in F3

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo PRESS RELEASE Denison Announces $15 million Strategic Investment in F3 Toronto, ON – October 6, 2023. Denison Mines Corp. (“Denison”) (TSX: DML; NYSE American: DNN) is pleased to announce that it has entered into a binding agreement with F3 Uranium Corp. (“F3”) to make a $15 million s

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: September 27, 2023 Commission File Number: 001-33414 D

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: September 27, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by

Denison Announces Signing of Landmark Shared Prosperity Agreement with English River First Nation

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo PRESS RELEASE Denison Announces Signing of Landmark Shared Prosperity Agreement with English River First Nation Toronto, ON – September 27, 2023. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is proud to announce the signing of a Shared Prosperity Agr

Denison CFO on Temporary Medical Leave of Absence, Interim CFO Appointed

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison CFO on Temporary Medical Leave of Absence, Interim CFO Appointed Toronto, ON – September 1, 2023. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) reports that Mac McDonald (CPA), the Company’s Chief Financial Officer, is on a temporary medical lea

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: September 1, 2023 Commission File Number: 001-33414 De

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: September 1, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by c

Denison Announces Filing of Technical Report for Wheeler River

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo PRESS RELEASE Denison Announces Filing of Technical Report for Wheeler River Toronto, ON – August 9, 2023. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) announces the filing of its technical report supporting the results of (i) the Feasibility Study (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 11, 2023 Commission File Number: 001-33414 Deni

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 11, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by che

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 10, 2023 Commission File Number: 001-33414 Deni

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 10, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by che

DENISON MINES CORP. Consent of Cliff Revering, P.Eng.

Exhibit 99.11 DENISON MINES CORP. Consent of Cliff Revering, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned

DENISON MINES CORP. Consent of Lorne Schwartz, P.Eng.

Exhibit 99.12 DENISON MINES CORP. Consent of Lorne Schwartz, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned

DENISON MINES CORP. Consent of Mark B. Mathisen, C.P.G.

Exhibit 99.6 DENISON MINES CORP. Consent of Mark B. Mathisen, C.P.G. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigne

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Gabriel (Mac) McDonald, Executive Vice President and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended June 30, 2023. 2. No misrepresentations

DENISON MINES CORP. Consent of David Myers, P.Eng.

Exhibit 99.8 DENISON MINES CORP. Consent of David Myers, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned her

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2023

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2023 TABLE OF CONTENTS Q2 2023 PERFORMANCE HIGHLIGHTS ABOUT DENISON RESULTS OF OPERATIONS Wheeler River Uranium Project LIQUIDITY AND CAPITAL RESOURCES OUTLOOK FOR 2023 ADDITIONAL INFORMATION CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS This Management’s Discussion and Analysis (‘MD&A’) of Deni

DENISON MINES CORP. Consent of Dan Johnson, P.E., RM-SME

Exhibit 99.4 DENISON MINES CORP. Consent of Dan Johnson, P.E., RM-SME Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersign

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 9, 2023 Commission File Number: 001-33414 Denis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: August 9, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Translation of registrant’s name into English) 1100-40 University Avenue Toronto, Ontario M5J 1T1, Canada (Address of principal execut

DENISON MINES CORP. Consent of Paul O’Hara, P.Eng.

Exhibit 99.10 DENISON MINES CORP. Consent of Paul O’Hara, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned he

DENISON MINES CORP. Consent of Mark Hatton, P.Eng.

Exhibit 99.3 DENISON MINES CORP. Consent of Mark Hatton, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned her

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David D. Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended June 30, 2023. 2. No misrepresentations: Based on my knowledge

At June 30

Exhibit 99.1 CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At June 30 2023 At December 31 2022 ASSETS Current Cash and cash equivalents (note 4) $ 46,500 $ 50,915 Trade and other receivables (note 5) 5,659 4,143 Inventories (note 6) 3,046 2,713 Investments-equity instruments (note 7) 8,483 8

DENISON MINES CORP. Consent of William McCombe, P.Eng.

Exhibit 99.7 DENISON MINES CORP. Consent of William McCombe, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned

Denison Reports Financial and Operational Results for Q2 2023

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for Q2 2023 Toronto, ON – August 10, 2023. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) has filed its Condensed Consolidated Financial Statements and Management’s Discussion & Analysis (‘MD&A’) for the

DENISON MINES CORP. Consent of Gordon Graham, P.Eng.

Exhibit 99.2 DENISON MINES CORP. Consent of Gordon Graham, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned h

DENISON MINES CORP. Consent of Jeffrey Martin, P.Eng.

Exhibit 99.5 DENISON MINES CORP. Consent of Jeffrey Martin, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned

Important Notice

Exhibit 99.1 NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada Prepared for: Denison Mines Corp. Prepared by: Gordon Graham P.Eng. Encomp Engineering and Computing Professionals Inc. Mark Hatton P.Eng. Stantec Consulting Ltd. Dan Johnson P.E., RM SME WSP USA Environment and Infrastructure Inc. Gregory Newman P.Eng. Newmans Geotechnique Inc. Jeffrey Marti

DENISON MINES CORP. Consent of Geoffrey Wilkie, P.Eng.

Exhibit 99.13 DENISON MINES CORP. Consent of Geoffrey Wilkie, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigne

DENISON MINES CORP. Consent of Gregory Newman, P.Eng.

Exhibit 99.9 DENISON MINES CORP. Consent of Gregory Newman, P.Eng. Ladies and Gentlemen: In connection with the filing on Form 6-K with the Securities and Exchange Commission (the “SEC”), of the technical report entitled “NI 43-101 Technical Report on the Wheeler River Project Athabasca Basin, Saskatchewan, Canada,” with an effective date of June 23, 2023 (the “Technical Report”), the undersigned

FORM 51-102F3 MATERIAL CHANGE REPORT

Exhibit 99.1 FORM 51-102F3 MATERIAL CHANGE REPORT Item 1: Name and Address of Company Denison Mines Corp. (“Denison” or the “Company”) 1100 – 40 University Avenue Toronto, ON M5J 1T1 Item 2: Date of Material Change June 26, 2023 Item 3: News Release A news release announcing the material change was disseminated on June 26, 2023 through the facilities of CNW Group (Cision), a copy of which have bee

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: June 30, 2023 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: June 30, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: June 26, 2023 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: June 26, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Denison Reports Significant Increase in Economic Results for Wheeler River

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Significant Increase in Economic Results for Wheeler River Toronto, ON – June 26, 2023. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE American) is pleased to report the results of (i) the Feasibility Study (“Phoenix FS”) completed for In-Situ Reco

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 16, 2023 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 16, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Denison Announces Results of Shareholder Meeting

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Results of Shareholder Meeting Toronto, ON – May 15, 2023. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML, NYSE American: DNN) is pleased to report that the nominees listed in the management proxy circular dated April 3, 2023 (the “Circular”) for the Annual

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, Gabriel (Mac) McDonald, Executive Vice President and Chief Financial Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended March 31, 2023. 2. No misrepresentation

At March 31

Exhibit 99.1 CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited - Expressed in thousands of Canadian dollars (“CAD”) except for share amounts) At March 31 2023 At December 31 2022 ASSETS Current Cash and cash equivalents (note 4) $ 57,462 $ 50,915 Trade and other receivables (note 5) 4,183 4,143 Inventories (note 6) 2,768 2,713 Investments-equity instruments (note 7) 9,192

Denison Reports Financial and Operational Results for Q1 2023

Exhibit 99.5 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Reports Financial and Operational Results for Q1 2023 Toronto, ON – May 10, 2023. Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML, NYSE American: DNN) today filed its Condensed Consolidated Financial Statements and Management’s Discussion & Analysis (‘MD&A’) for the q

MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE MONTHS ENDED MARCH 31, 2023 TABLE OF CONTENTS Q1 2023 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 2 RESULTS OF OPERATIONS 4 Wheeler River Uranium Project 5 LIQUIDITY AND CAPITAL RESOURCES 15 OUTLOOK FOR 202

Exhibit 99.2 MANAGEMENT’S DISCUSSION & ANALYSIS FOR THE THREE MONTHS ENDED MARCH 31, 2023 TABLE OF CONTENTS Q1 2023 PERFORMANCE HIGHLIGHTS 2 ABOUT DENISON 2 RESULTS OF OPERATIONS 4 Wheeler River Uranium Project 5 LIQUIDITY AND CAPITAL RESOURCES 15 OUTLOOK FOR 2023 17 ADDITIONAL INFORMATION 17 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 18 This Management’s Discussion and Analysis (‘M

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS I, David D. Cates, President and Chief Executive Officer of Denison Mines Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the "interim filings") of Denison Mines Corp. (the "issuer") for the interim period ended March 31, 2023. 2. No misrepresentations: Based on my knowledg

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 11, 2023 Commission File Number: 001-33414 Denison

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: May 11, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Denison Releases 2022 ESG Report, Highlighting Progress on Environmental, Social and Governance Initiatives

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com @DenisonMinesCo PRESS RELEASE Denison Releases 2022 ESG Report, Highlighting Progress on Environmental, Social and Governance Initiatives Toronto, ON – April 18, 2023 Denison Mines Corp. (‘Denison’ or the ‘Company’) (TSX: DML; NYSE American: DNN) is pleased to announce that it has published its 2022

Denison Announces Discovery of High-Grade Uranium Mineralization at Moon Lake South

Exhibit 99.2 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Discovery of High-Grade Uranium Mineralization at Moon Lake South Toronto, ON – April 19, 2023. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE American) is pleased to report that drill hole MS-23-10A intersected 1.38% eU3O8 over 8.7 metres (0.05%

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 19, 2023 Commission File Number: 001-33414 Denis

6-K 1 form6-k.htm FORM 6-K DATED APRIL 19, 2023 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 19, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 12, 2023 Commission File Number: 001-33414 Denis

6-K 1 form6-k.htm FORM 6-K DATED APRIL 12, 2023 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 12, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address

Denison Announces Completion of Conceptual Mining Study Evaluating ISR for Midwest and Plans to Advance Efforts in 2023

Exhibit 99.1 Denison Mines Corp. 1100 – 40 University Ave Toronto, ON M5J 1T1 www.denisonmines.com PRESS RELEASE Denison Announces Completion of Conceptual Mining Study Evaluating ISR for Midwest and Plans to Advance Efforts in 2023 Toronto, ON – April 12, 2023. Denison Mines Corp. (“Denison” or the “Company”) (TSX: DML; NYSE American: DNN) is pleased to announce the successful completion of an in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 6, 2023 Commission File Number: 001-33414 Deniso

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Date: April 6, 2023 Commission File Number: 001-33414 Denison Mines Corp. (Name of registrant) 1100-40 University Avenue Toronto Ontario M5J 1T1 Canada (Address of principal executive offices) Indicate by check

Notice and Access Notification to Shareholders Annual General Meeting of Shareholders May 15, 2023

Exhibit 99.1 Notice and Access Notification to Shareholders Annual General Meeting of Shareholders May 15, 2023 You are receiving this notification because Denison Mines Corp. (the “Company”) has opted to use the “notice and access” model for the delivery of its information circular (the “Circular”) to its shareholders in respect of its annual general meeting of shareholders to be held on May 15,