Exhibit 99.1

UNDERWRITING AGREEMENT

October 8, 2020

Denison Mines Corp.

40 University Avenue, Suite 1100

Toronto, Ontario

Canada M5J 1T1

Dear Sirs/Mesdames:

Cantor Fitzgerald Canada Corporation (“CFCC”) together with Haywood Securities Inc. (“Haywood” and together with CFCC, the “Co-Lead Underwriters”), as co-bookrunners and co-lead underwriters, along with Canaccord Genuity Corp., Scotia Capital Inc., and TD Securities Inc. (collectively with the Co-Lead Underwriters, the “Underwriters” and each individually an “Underwriter”), hereby severally, and not jointly nor jointly and severally, offer to purchase from Denison Mines Corp. (the “Company”) in the respective percentages set forth in Section 18 hereof, and the Company hereby agrees to issue and sell to the Underwriters, upon and subject to the terms hereof, an aggregate of 47,000,000 common shares of the Company (the “Firm Shares”) on an underwritten basis at a price of $0.37 per Firm Share (the “Offering Price”) for an aggregate purchase price of $17,390,000. Up to an aggregate of 1,351,351 Firm Shares for total gross proceeds of approximately $500,000 may be issued to subscribers identified by the Company (the “President’s List”).

Upon and subject to the terms and conditions contained herein, the Company hereby grants to the Underwriters an option (the “Over-Allotment Option”) to purchase severally, and not jointly nor jointly and severally, in the respective percentages set forth in Section 18 hereof, up to an additional 7,050,000 common shares of the Company (the “Additional Shares”) at a price of $0.37 per Additional Share for the purposes of covering over-allotments and for market stabilization purposes. The Over-Allotment Option may be exercised in accordance with Section 6(3) hereof. The Firm Shares and the Additional Shares are collectively referred to herein as the “Offered Shares”.

The Company and the Underwriters agree that (i) any offers or sales of the Offered Shares in Canada will be conducted through the Underwriters, or one or more affiliates of the Underwriters, duly registered in compliance with applicable Canadian Securities Laws (as hereinafter defined); and (ii) any offers or sales of the Offered Shares in the United States will be conducted through the Underwriters, or one or more affiliates of the Underwriters, duly registered as a broker-dealer in compliance with applicable U.S. Securities Laws (as hereinafter defined) and the requirements of FINRA (as hereinafter defined).

In consideration of the agreement on the part of the Underwriters to purchase the Offered Shares and in consideration of the services rendered and to be rendered by the Underwriters hereunder, the Company agrees to pay to CFCC on behalf of the Underwriters, at the Closing Time (as hereinafter defined), and at the Option Closing Time (as hereinafter defined), if any, a cash fee equal to 6.0% of the aggregate gross proceeds of the Offering, other than sales to subscribers on the President’s List, on which the Company will pay the Underwriters a commission equal to 3.0% (the “Underwriting Fee”), the payment of such fee to be reflected by the Underwriters making payment of the gross proceeds of the sale of the Firm Shares or the Additional Shares, as the case may be, to the Company less the amount of the Underwriting Fee and all fees, disbursements and expenses incurred by the Underwriters in accordance with the provisions in Section 16 hereof.

This Agreement shall be subject to the following terms and conditions:

TERMS AND CONDITIONS

Section 1                  Interpretation

(1)            Definitions

Where used in this Agreement or in any amendment hereto, the following terms shall have the following meanings, respectively:

“Additional Shares” has the meaning given to it in the second paragraph of this Agreement;

“affiliate” has the meaning given to it in the Business Corporations Act (Ontario);

“Agreement” means the agreement resulting from the acceptance by the Company of the offer made by the Underwriters by this agreement;

“Amended and Restated Canadian Preliminary Base Prospectus” has the meaning given to it in Section 2(1);

“APG” means Anglo Pacific Group PLC;

“APG Loan” means the $43.5 million lending and streaming arrangement between the Company’s subsidiaries, DMI and 937321 Canada Inc. with APG and its wholly-owned subsidiary Centaurus Royalties Ltd.;

“Applicable Laws” means, in relation to any person or persons, the Applicable Securities Laws and all other statutes, regulations, rules, orders, by-laws, codes, ordinances, decrees, the terms and conditions of any grant of approval, permission, authority or licence, or any judgment, order, decision, ruling, award, policy or guidance document, of any Governmental Authority that are applicable to such person or persons or its or their business, undertaking, property or securities and emanate from a Governmental Authority, having jurisdiction over the person or persons or its or their business, undertaking, property or securities;

“Applicable Securities Laws” means the Canadian Securities Laws and the U.S. Securities Laws;

“Applicable Time” has the meaning given to it in Section 2(7);

“Business Day” means any day, other than a Saturday or Sunday, on which banks are open for business in Vancouver, British Columbia, Toronto, Ontario and New York, New York;

“Canadian Commissions” means the securities regulatory authorities in each of the Qualifying Jurisdictions;

“Canadian Final Base Prospectus” has the meaning given to it in Section 2(3);

“Canadian Offering Documents” has the meaning given to it in Section 5(1)(c);

“Canadian Preliminary Base Prospectus” has the meaning given to it in Section 2(1);

“Canadian Preliminary Prospectus Supplement” has the meaning given to it in Section 2(3);

“Canadian Prospectus” has the meaning given to it in Section 2(3)

“Canadian Prospectus Supplement” has the meaning given to it in Section 2(3);

“Canadian Securities Laws” means all applicable securities laws of each of the Qualifying Jurisdictions and the respective rules and regulations under such laws together with applicable published national, multilateral and local policy statements, instruments, notices, blanket orders and rulings of the securities regulatory authorities in the Qualifying Jurisdictions;

“CDS” means the CDS Clearing and Depository Services Inc.;

“CF US” has the meaning given to it in Section 8;

“CFCC” means Cantor Fitzgerald Corporation Canada;

“Claim” has the meaning given to it in Section 10(2);

“Closing Date” has the meaning given to it in Section 6(2);

“Closing Time” has the meaning given to it in Section 6(2);

“Code” has the meaning given to it in Section 8(eee);

“Commission” means the Ontario Securities Commission;

“Common Shares” means the common shares in the capital of the Company;

“Company” means Denison Mines Corp.;

“Corporate Records” has the meaning given to it in Section 8(w);

“December 2019 FT Private Placement” means the sale of 6,934,500 common shares in the capital of the Company pursuant to the December 2019 FT Private Placement Underwriting Agreement, which common shares were issued as “flow-through shares” as defined in subsection 66(15) of the Tax Act at a price of $0.68 per share;

“December 2019 FT Private Placement Underwriting Agreement” means the underwriting agreement dated December 6, 2019 between the Company and CFCC, Haywood Securities Inc., TD Securities Inc. and BMO Nesbitt Burns Inc. with respect to the December 2019 FT Private Placement;

“Defaulting Underwriter” has the meaning given to it in Section 18(2);

“Distribution” means “distribution” or “distribution to the public” as those terms are defined in the Applicable Securities Laws;

“DMI” means Denison Mines Inc.;

“Effective Date” has the meaning given to it in Section 2(2);

“Entity” has the meaning given to it in Section 8(nnn);

”Employee Plans” has the meaning given in Section 8(zz)(iii);

“Environmental Laws” has the meaning given in Section 8(hhh)(i);

“Environmental Permits” has the meaning given in Section 8(hhh)(ii);

“Exchanges” means, collectively, the TSX and NYSE American;

“Evaluation Date” has the meaning given to it in Section 8(y).

“Exchange Act” has the meaning given to it in Section 2(9);

“Financial Statements” has the meaning given to it in Section 8(s);

“FINRA” means the Financial Industry Regulatory Authority, Inc.

“Firm Shares” has the meaning given to it in the first paragraph of this Agreement;

“Form F-X” has the meaning given to it in Section 2(2);

“Governmental Authority” means and includes, without limitation, any national, federal, provincial, state or municipal government or other political subdivision of any of the foregoing, any entity exercising executive, legislative, judicial, regulatory or administrative functions of or pertaining to government and any corporation or other entity owned or controlled (through stock or capital ownership or otherwise) by any of the foregoing;

“Hazardous Substances” has the meaning given to it in Section 8(hhh)(i);

“IFRS” has the meaning given to it in Section 8(s);

“Incorporated Documents” has the meaning given to it in Section 2(8);

“Indemnified Party” has the meaning given to it in Section 1(1);

“Indemnifying Party” has the meaning given to it in Section 1(1);

“Initial Canadian Preliminary Base Shelf Prospectus” has the meaning given to it in Section 2(1);

“Intellectual Property” has the meaning given to in Section 8(nn);

“Issuer Free Writing Prospectus” means an “issuer free writing prospectus” as defined in Rule 433 under the Securities Act relating to the Offered Shares that (i) is required to be filed with the SEC by the Company, (ii) is a “road show that is a written communication” within the meaning of Rule 433(d)(8)(i) under the Securities Act whether or not required to be filed with the SEC or (iii) is exempt from filing pursuant to Rule 433(d)(5)(i) under the Securities Act because it contains a description of the Offered Shares or of the Offering that does not reflect the final terms, in each case in the form filed or required to be filed with the SEC or, if not required to be filed, in the form retained in the Company’s records pursuant to Rule 433(g) under the Securities Act;

“ITA” means the Income Tax Act (Canada), as amended;

“IT Systems and Data” meaning given to it in Section 8(rrr);

“Joint Venture Entities” means each person or body corporate, howsoever constituted in any jurisdiction, which is an owner or operator of any of the Material Properties, including, to the extent applicable, the Company and DMI, provided that any representation or warranty of this Company in this Agreement relating to Joint Venture Entities other than the Company or DMI shall be deemed to be limited to only apply in respect of the Material Properties, and “Joint Venture Entity” means any one of the Joint Venture Entities;

“KHNP Strategic Relationship Agreement” means the amended and restated strategic relationship agreement made as of September 19, 2017 between the Company and KHNP Canada Energy Ltd.;

“Marketing Documents” means the marketing materials approved in accordance with Section 4(2);

“marketing materials” has the meaning given to it in NI 41-101;

“Material Adverse Effect” means any event, fact, circumstance, development, occurrence or state of affairs (i) that is materially adverse to the business, assets (including intangible assets), affairs, operations, liabilities (contingent or otherwise), capital, properties, condition (financial or otherwise) or results of operations of the Company and any of the Material Subsidiaries or Joint Venture Entities, taken as a whole, whether or not arising in the ordinary course of business or (ii) that would result in any of the Offering Documents containing a misrepresentation;

“Material Agreements” mean any mortgage, note, indenture, contract, agreement (written or oral), instrument, lease or other document to which the Company, a Subsidiary or a Joint Venture Entity is a party or by which the Company, a Subsidiary or a Joint Venture Entity or a material portion of the assets thereof are bound which is material to the Company (on a consolidated basis);

“material change” means a material change in or relating to the Company for the purposes of Applicable Securities Laws or any of them, or where undefined under the Applicable Securities Laws of an Offering Jurisdiction means a change in or relating to the business, operations or capital of the Company and its subsidiaries taken as a whole that would reasonably be expected to have a significant effect on the market price or value of any securities of the Company and includes a decision to implement such a change made by the board of directors of the Company or by senior management who believe that confirmation of the decision by the board of directors of the Company is probable;

“material fact” means a material fact for the purposes of Applicable Securities Laws or any of them, or where undefined under the Applicable Securities Laws of an Offering Jurisdiction means a fact that would reasonably be expected to have a significant effect on the market price or value of any securities of the Company;

“Material Properties” means, collectively:

(i)       the Wheeler River uranium project consisting of 19 mineral claims covering an aggregate area of 11,720 hectares;

(ii)      the Waterbury Lake project comprised of 12 contiguous claims and one separate claim covering 40,256 hectares that is owned by the Company and the Korea Waterbury Uranium Limited Partnership, as limited partners, and Waterbury Lake Uranium corporation, as general partner, in the Waterbury Lake Uranium Limited Partnership;

(iii)     the McClean Lake project consisting of 13 mineral claims covering an aggregate area of 3,111 hectares, 4 mineral leases covering an area of 1,147 hectares, and the McClean Lake uranium processing facility; and

(iv)     the Midwest project consisting of 3 contiguous mineral leases covering an area of 1,426 hectares, all located in the Athabasca Basin region of Saskatchewan;

“Material Subsidiaries” has the meaning given to it in Section 8(v);

“misrepresentation” means a misrepresentation for the purposes of the Applicable Securities Laws of an Offering Jurisdiction or any of them, or where undefined under the Applicable Securities Laws of an Offering Jurisdiction means: (i) an untrue statement of a material fact, or (ii) an omission to state a material fact that is required to be stated or that is necessary to make a statement not misleading in the light of the circumstances in which it was made;

“MI 11-202” means Multilateral Instrument 11-102 - Passport System;

“MJDS” has the meaning given to it in Section 2(2);

“Money Laundering Laws” has the meaning given in Section 8(mmm);

“NI 43-101” means National Instrument 43-101 – Standards of Disclosure for Mineral Projects;

“NI 44-101” means National Instrument 44-101 – Short Form Prospectus Distributions;

“NI 44-102” means National Instrument 44-102 – Shelf Distributions;

“NI 51-102” means National Instrument 51-102 – Continuous Disclosure Obligations;

“NI 52-109” means National Instrument 52-109 - Certification of Disclosure in Issuers’ Annual and Interim Filings;

“NP 11-202” means National Policy 11-202 - Process for Prospectus Reviews in Multiple Jurisdictions;

“NYSE American” means the NYSE American LLC;

“Offered Shares” has the meaning given to it in the second paragraph of this Agreement;

“Offering” means the sale of Offered Shares pursuant to this Agreement;

“Offering Documents” means the Canadian Offering Documents and the U.S. Offering Documents;

“Offering Jurisdictions” means the United States and the Qualifying Jurisdictions;

“Offering Price” has the meaning given to it in the first paragraph of this Agreement;

“Option Closing Date” has the meaning given to it in Section 6(3);

“Option Closing Time” has the meaning given to it in Section 6(3);

“Over-Allotment Option” has the meaning given to it in the second paragraph of this Agreement;

“Passport System” has the meaning given to it in Section 2(1);

“Permits” has the meaning given to it in Section 8(vv)(i);

“Person” has the meaning given to it in Section 8(ee);

“Preliminary Prospectuses” has the meaning given to it in Section 2(5);

“Principal Regulator” has the meaning given to it in Section 2(1);

“Prospectuses” has the meaning given to it in Section 2(5);

“Prospectus Supplements” has the meaning given to it in Section 2(5);

“Purchasers” means, collectively, each of the purchasers of the Offered Shares arranged by the Underwriters pursuant to the Offering;

“Qualified Expenditures” has the meaning given to it in the December 2019 FT Private Placement Underwriting Agreement;

“Qualifying Jurisdictions” means each of the provinces and territories of Canada, other than Quebec;

“Registration Statement” has the meaning given to it in Section 2(4);

“Regulation M” has the meaning given to it in Section 8(fff);

“Reports” has the meaning given to it in Section 8(ww)(i);

“Road Show” has the meaning given to it in Section 2(7);

“Sanctions” has the meaning given to it in Section 8(nnn)(A);

“SEC” has the meaning given to it in Section 2(2);

“SEDAR” means the System for Electronic Document Analysis and Retrieval;

“Securities Act” has the meaning given to it in Section 2(2)

“Selling Firm” has the meaning given to it in Section 3(1);

“Senior Secured Credit Facility” means the revolving term credit facility for CDN$24,000,000 established pursuant to the fourth amended and restated credit agreement dated as of January 30, 2015, as amended by agreements dated January 27, 2016, January 31, 2017, January 19, 2018, April 9, 2018, January 29, 2019 and January 29, 2020, among the Company and DMI, as borrowers, Scotia Capital as the sole and lead arranger and bookrunner, The Bank of Nova Scotia, as administrative agent and the lending institutions from time to time parties to such agreement as lenders, as amended from time to time;

“Shelf Information” has the meaning given to it in Section 2(1);

“Shelf Procedures” has the meaning given to it in Section 2(1);

“Subsidiary” has the meaning ascribed thereto in the Applicable Securities Laws of the Province of Ontario and includes the Material Subsidiaries, and “Subsidiaries” means all of them;

“Supplementary Material” has the meaning given to it in Section 2(6);

“template version” has the meaning ascribed to such term in NI 41-101 and includes any revised template version of marketing materials as contemplated by NI 41-101;

“Time of Sale Prospectus” has the meaning given to it in Section 2(7);

“TSX” means the Toronto Stock Exchange;

“Underwriters” has the meaning given to it in the first paragraph of this Agreement;

“Underwriters’ Expenses” has the meaning given to it in Section 16;

“Underwriting Fee” has the meaning given to it in the fourth paragraph of this Agreement;

“U.S. Amended Prospectus” means a prospectus included in any U.S. Registration Statement Amendment;

“U.S. Final Base Prospectus” has the meaning given to it in Section 2(3);

“U.S. Offering Documents” means the Registration Statement, any U.S. Registration Statement Amendment, the U.S. Preliminary Base Prospectus, the Time of Sale Prospectus, the U.S. Prospectus, and any U.S. Amended Prospectus;

“U.S. Preliminary Base Prospectus” has the meaning given to it in Section 2(2);

“U.S. Preliminary Prospectus” has the meaning given to it in Section 2(3);

“U.S. Preliminary Prospectus Supplement” has the meaning given to it in Section 2(3);

“U.S. Prospectus” has the meaning given to it in Section 2(3);

“U.S. Prospectus Supplement” has the meaning given to it in Section 2(3);

“U.S. Registration Statement Amendment” means any amendment to the Registration Statement and any post-effective amendment to the Registration Statement filed with the SEC during the distribution of the Offered Shares;

“U.S. Securities Laws” has the meaning given to it in Section 2(2);

“United States” means the United States of America, its territories and possessions, any State of the United States and the District of Columbia;

“WLUC” means Waterbury Lake Uranium Corp.; and

“WLULP” means Waterbury Lake Uranium Limited Partnership.

(2)            Capitalized terms used but not defined herein have the meanings ascribed to them in the Canadian Final Base Prospectus.

(3)            Any reference in this Agreement to a Section or Subsection shall refer to a section or subsection of this Agreement.

(4)            All words and personal pronouns relating thereto shall be read and construed as the number and gender of the party or parties referred to in each case required and the verb shall be construed as agreeing with the required word and/or pronoun.

(5)           Any reference in this Agreement to “$” or to “dollars” shall refer to the lawful currency of the United States, unless otherwise specified. “C$” shall refer to the lawful currency of Canada.

(6)            The following are the schedules to this Agreement, which schedules are deemed to be a part hereof and are hereby incorporated by reference herein:

Schedule “A” – List of Material Subsidiaries

Schedule “B” – Matters to be Addressed in the Company’s Canadian Counsel Opinion

Schedule “C” – Form of Opinion to be Provided by the Company’s U.S. Counsel

Schedule “D” – Form of Lock-Up Agreement

Section 2                  Background and Interpretation.

(1)           The Company has prepared and filed with the securities regulatory authorities in each of the provinces of Canada a preliminary short form base shelf prospectus dated May 8, 2020 (the “Initial Canadian Preliminary Base Shelf Prospectus”) relating to the distribution of up to C$175,000,000 of common shares, warrants, subscription receipts, debt securities, units, share purchase contracts, or any combination of such securities of the Company (the “Shelf Securities”) pursuant to Canadian Securities Laws and in accordance with MI 11-102 and NP 11-202 (together, the “Passport System”). On May 26, 2020 the company prepared and filed a preliminary short form base shelf prospectus with the securities regulatory authorities in each of the territories of Canada relating to the distribution of up to C$175,000,000 in Shelf Securities pursuant to Canadian Securities Laws and in accordance with the Passport System, which prospectus was also filed with the securities regulatory authorities in each of the provinces of Canada as an amended and restated preliminary short form base shelf prospectus dated May 26, 2020 (the “Amended and Restated Canadian Preliminary Base Prospectus”). Such preliminary short form base shelf prospectus or amended and restated short form base shelf prospectus, as applicable, relating to the distribution of the Shelf Securities, including any documents incorporated by reference therein and any supplements or amendments thereto, is herein called the “Canadian Preliminary Base Prospectus.” The Company has prepared and filed the Canadian Preliminary Base Prospectus pursuant to NI 44-101 and National Instrument 44-102 – Shelf Distributions, the “Shelf Procedures”. The Ontario Securities Commission (the “Principal Regulator”) has issued a receipt for the Canadian Preliminary Base Prospectus and the Company has satisfied the conditions in MI 11-102 to the deemed issuance of a receipt by the Canadian Commissions for the Canadian Preliminary Base Prospectus in each of the other Qualifying Jurisdictions.

(2)           The Company has also prepared and filed with the United States Securities and Exchange Commission (the “SEC”) pursuant to the Canada/United States Multi-Jurisdictional Disclosure System adopted by the Canadian Commissions and the SEC (the “MJDS”), a registration statement on Form F-10 (Registration No. 333-238108) under the United States Securities Act of 1933, as amended (together with the rules and regulations promulgated thereunder, the “Securities Act”), including the Initial Canadian Preliminary Base Prospectus with such deletions therefrom and additions or changes thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the SEC. The Company has also prepared and filed with the SEC an Appointment of Agent for Service of Process and Undertaking on Form F-X at the time of the initial filing of the registration statement on Form F-10 (the “Form F-X”). On May 27, 2020 the Company prepared and filed with the SEC pursuant to the MJDS an Amendment No. 1 to the registration statement on Form F-10 (Registration No. 333-238108) under the Securities Act, including the Amended and Restated Canadian Preliminary Base Prospectus with such deletions therefrom and additions or changes thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the SEC. Such prospectus, including the documents incorporated by reference therein and any supplements or amendments thereto, is herein called the “U.S. Preliminary Base Prospectus”. For purposes of this Agreement, “U.S. Securities Laws” means all applicable securities laws in the United States, including without limitation, the Securities Act, the Exchange Act (as defined in Section 2(9)) and the rules and regulations promulgated thereunder, and any applicable state securities laws.

(3)            In addition, the Company (a) has prepared and filed (i) with the securities regulatory authorities in each of the provinces and territories of Canada, a final short form base shelf prospectus dated June 2, 2020 relating to the distribution of the Shelf Securities (including any documents incorporated therein by reference and any supplements or amendments thereto, the “Canadian Final Base Prospectus”), pursuant to the Shelf Procedures, omitting the Shelf Information (as hereinafter defined) in accordance with the rules and procedures set forth in NI 44-102, and (ii) with the SEC an Amendment No. 2 to the registration statement on Form F-10 (Registration No. 333-238108) under the Securities Act, including the Canadian Final Base Prospectus with such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the SEC (such prospectus included therein, including the documents incorporated by reference therein and any supplements or amendments thereto, the “U.S. Final Base Prospectus”), which amended registration statement on Form F-10 became effective on June 3, 2020 (the “Effective Date”) pursuant to Rule 467(b) under the Securities Act, (iii) with the Canadian Commissions in the Qualifying Jurisdictions, in accordance with the Shelf Procedures, a preliminary prospectus supplement dated October 7, 2020, relating to the Offered Shares, which excluded certain information (“Canadian Preliminary Prospectus Supplement”, together with the Canadian Final Base Prospectus, and including any documents incorporated therein by reference and the documents otherwise deemed to be incorporated by reference therein pursuant to Canadian Securities Laws, the “Canadian Preliminary Prospectus”), and (iv) with the SEC pursuant to General Instruction II.L of Form F-10, the Canadian Preliminary Prospectus Supplement, with such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the SEC (including all documents incorporated therein by reference, the “U.S. Preliminary Prospectus Supplement, together with the U.S. Final Base Prospectus, the “U.S. Preliminary Prospectus”), and (b) will prepare and file, as promptly as possible and in any event (i) not later than 5:00 p.m. (Toronto time) on October 8, 2020, with the Canadian Commissions in the Qualifying Jurisdictions, in accordance with the Shelf Procedures, a prospectus supplement setting forth the Shelf Information (including any documents incorporated therein by reference and any supplements or amendments thereto, the “Canadian Prospectus Supplement”, and together with the Canadian Final Base Prospectus, the “Canadian Prospectus”), and (ii) within one business day of such filing with the Canadian Commissions, with the SEC pursuant to General Instruction II.L, of Form F-10, the Canadian Prospectus Supplement with such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the SEC (including all documents incorporated by reference, the “U.S. Prospectus Supplement”, and together with the U.S. Final Base Prospectus, the “U.S. Prospectus”). The information, if any, included in the Canadian Prospectus Supplement that is omitted from the Canadian Final Base Prospectus for which a final receipt has been obtained from the Canadian Commissions, but that is deemed under the Shelf Procedures to be incorporated by reference into the Canadian Final Base Prospectus as of the date of the Canadian Prospectus Supplement, is referred to herein as the “Shelf Information.” The Canadian Preliminary Prospectus and the U.S. Preliminary Prospectus and any other prospectus supplement to the Canadian Final Base Prospectus and U.S. Final Base Prospectus in preliminary form that describes the Offered Shares and the Offering and is used prior to the filing of the Prospectuses (as defined below), together with the Canadian Final Base Prospectus and U.S. Final Base Prospectus, are collectively called the “Preliminary Prospectuses”.

(4)            The registration statement on Form F-10, at any given time, including amendments thereto to such time, the exhibits and any schedules thereto, at such time, and the documents incorporated by reference therein pursuant to Item 4 of Form F-10, at such time, and including the Shelf Information, is herein called the “Registration Statement.”

(5)           The U.S. Prospectus and the Canadian Prospectus are hereinafter collectively sometimes referred to as the “Prospectuses.” The U.S. Prospectus Supplement and the Canadian Prospectus Supplement are hereinafter collectively sometimes referred to as the “Prospectus Supplements.”

(6)           Any amendment or supplement to the U.S. Prospectus or the Canadian Prospectus (including any document incorporated by reference therein), that may be filed by or on behalf of the Company with the Canadian Commissions in the Qualifying Jurisdictions or with the SEC after the Canadian Prospectus Supplement and the U.S. Prospectus Supplement have been filed and prior to the expiry of the period of distribution of the Offered Shares, is referred to herein collectively as the “Supplementary Material”.

(7)           As used herein, the “Applicable Time” is 5:00 p.m. (New York City time) on the date of this Agreement. As used herein, a “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act, and a “Time of Sale Prospectus” means the U.S. Preliminary Prospectus together with the information and the free writing prospectuses (including, without limitation, the term sheets dated October 7, 2020 and October 8, 2020), and each “road show” (as defined in Rule 433 under the Securities Act), if any, related to the offering of the Offered Shares contemplated hereby that is a “written communication” (as defined in Rule 405 under the Securities Act) (each such road show, a “Road Show”).

(8)           As used herein, the terms “Registration Statement”, “Preliminary Prospectuses”, “Time of Sale Prospectus” and “Prospectuses” shall include the documents incorporated and deemed to be incorporated by reference therein (the “Incorporated Documents”), including, unless the context otherwise requires, the documents, if any, filed as exhibits to such Incorporated Documents.

(9)            All references in this Agreement to the Registration Statement, the U.S. Preliminary Prospectus or the U.S. Prospectus shall include any copy thereof filed with the SEC pursuant to its Electronic Data Gathering, Analysis and Retrieval system (“EDGAR”). All references in this Agreement to Financial Statements (as defined in Section 8(s)) and schedules and other information which are “contained,” “included” or “stated” in the Registration Statement, the U.S. Preliminary Prospectus, the Time of Sale Prospectus or the U.S. Prospectus (and all other references of like import) shall be deemed to mean and include all such Financial Statements and schedules and other information which is or is deemed to be incorporated by reference in the Registration Statement, the U.S. Preliminary Prospectus, the Time of Sale Prospectus or the U.S. Prospectus, as the case may be; and all references in this Agreement to amendments or supplements to the Registration Statement, the U.S. Preliminary Prospectus, the Time of Sale Prospectus or the U.S. Prospectus, as the case may be, shall be deemed to mean and include the filing of any document under the United States Securities Exchange Act of 1934, as amended (together with the rules and regulations promulgated thereunder, the “Exchange Act”) or otherwise that is or is deemed to be incorporated by reference in the Registration Statement, the U.S. Preliminary Prospectus, the Time of Sale Prospectus or the U.S. Prospectus, as the case may be.

Section 3                  Distribution of the Offered Shares

(1)            Each Underwriter shall be permitted to appoint additional investment dealers or brokers (each, a “Selling Firm”) as its agents in the Offering and each such Underwriter may determine the remuneration payable to such Selling Firm. The Underwriters may offer the Offered Shares, directly and through Selling Firms or any duly registered affiliate of an Underwriter, in the Offering Jurisdictions for sale to the public only in accordance with Applicable Securities Laws and in any jurisdiction outside of the Offering Jurisdictions (subject to Section 7 hereof) to purchasers permitted to purchase the Offered Shares only in accordance with Applicable Securities Laws and applicable securities laws in such jurisdiction, and upon the terms and conditions set forth in the Offering Documents and in this Agreement. Each Underwriter shall require any Selling Firm appointed by such Underwriter to agree to the foregoing and such Underwriter shall be severally responsible for the compliance by such Selling Firm with the provisions of this Agreement.

(2)           For purposes of this Section 3, the Underwriters shall be entitled to assume that the Offered Shares are qualified for Distribution in any Qualifying Jurisdiction, unless otherwise notified in writing by the Company.

(3)           The Co-Lead Underwriters shall promptly notify the Company when, in their opinion, the Distribution of the Offered Shares has ceased and will provide to the Company, as soon as practicable thereafter, a breakdown of the number of Offered Shares distributed in each of the Qualifying Jurisdictions where such breakdown is required for the purpose of calculating fees payable to the Canadian Securities Commissions and, if applicable, in the United States.

(4)            The Underwriters shall not, in connection with the services provided hereunder, make any representations or warranties with respect to the Company or its securities, other than as set forth in the Offering Documents or in any Issuer Free Writing Prospectus.

(5)            Notwithstanding the foregoing provisions of this Section 3, no Underwriter will be liable to the Company under this Section 3 with respect to a default by another Underwriter or another Underwriter’s duly registered broker-dealer affiliate in the United States or any Selling Firm, as the case may be.

(6)            The Underwriters acknowledge that the Company is not taking any steps to qualify the Offered Shares for Distribution or register the Offered Shares or the Distribution thereof with any securities authority outside of the Offering Jurisdictions.

Section 4                  Preparation of Prospectus Supplement; Marketing Materials; Due Diligence

(1)            During the period of the Distribution of the Offered Shares, the Company shall co-operate in all respects with the Underwriters to allow and assist the Underwriters to participate fully in the preparation of, and allow the Underwriters to approve (acting reasonably) the form and content of, the Offering Documents and any Issuer Free Writing Prospectus and shall allow the Underwriters to conduct all “due diligence” investigations which the Underwriters may reasonably require to fulfil the Underwriters’ obligations under Applicable Securities Laws as underwriters and, in the case of the Canadian Prospectus Supplement, to enable the Underwriters responsibly to execute any certificate required to be executed by the Underwriters.

(2)            Without limiting the generality of clause (1) above, during the Distribution of the Offered Shares:

(3)            By the act of having delivered the Preliminary Prospectuses, the Time of Sale Prospectus and the Prospectuses to the Underwriters, the Company shall have represented and warranted to the Underwriters that all information and statements (except written information relating to the Underwriters or regarding securities laws and available offering exemptions in jurisdictions other than Canada and the United States furnished to the Company by the Underwriters expressly for use in the Offering Documents and set forth in the “Plan of Distribution” section of the Offering Documents, and under “Notice to Investors”, any Issuer Free Writing Prospectus or any Supplementary Materials) contained in such documents, at the respective dates of initial delivery thereof, comply with the Applicable Securities Laws and are true and correct in all material respects, and that such documents, at such dates, contain no misrepresentation or omit to state a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading and constitute full, true and plain disclosure of all material facts relating to the Company and the Offering as required by the Applicable Securities Laws.

(4)            Each of the Company and the Underwriters, on a several basis, covenants and agrees not to provide any potential Purchaser with any marketing materials except for marketing materials which have been approved as contemplated in Section 4(2).

Section 5                  Material Changes

(1)            During the period from the date of this Agreement to the completion of the Distribution of the Offered Shares, the Company covenants and agrees with the Underwriters that it shall promptly notify the Underwriters in writing of:

(2)            The Underwriters agree, and will require each Selling Firm to agree, to cease the Distribution of the Offered Shares upon the Underwriter receiving written notification of any change or material fact with respect to any Offering Document contemplated by this Section 5 and to not recommence the Distribution of the Offered Shares until Supplementary Material disclosing such change are filed in such Offering Jurisdiction.

(3)            The Company shall promptly comply with all applicable filing and other requirements under Applicable Securities Laws whether as a result of such change, material fact or otherwise; provided that the Company shall not file any Supplementary Material or other document without first providing the Underwriters with a copy of such Supplementary Material or other document and consulting with the Underwriters with respect to the form and content thereof.

(4)            If during the Distribution of the Offered Shares there is any change in any Applicable Securities Laws, which results in a requirement to file a Canadian Prospectus Amendment or U.S. Registration Statement Amendment, the Company shall subject to the proviso in Section 5(2) above, make any such filing under Applicable Securities Laws as soon as possible.

(5)                The Company shall in good faith discuss with the Underwriters any fact or change in circumstances (actual, anticipated, contemplated or threatened, financial or otherwise) which is of such a nature that there is reasonable doubt whether written notice need be given under this Section 5.

Section 6                  Purchase, Sale, Payment and Delivery of the Offered Shares.

The Company hereby confirms its agreement with the Underwriters concerning the purchase and sale of the Offered Shares as follows:

(1)            Public Offering of the Offered Shares. The Co-Lead Underwriters hereby advise the Company that the Underwriters intend to offer for sale to the public, on the terms set forth in the Time of Sale Prospectus and each Prospectus, their respective portions of the Offered Shares as soon after this Agreement has been executed as the Co-Lead Underwriters, in their sole judgment, have determined is advisable and practicable. After the Underwriters have made a reasonable effort to sell all of the Offered Shares at the Offering Price, the purchase price of the Offered Shares may be decreased by the Underwriters and may be further changed from time to time to an amount not greater than the Offering Price, and the compensation realized by the Underwriters will be decreased by the amount that the aggregate price paid by purchasers for the Offered Shares is less than the gross proceeds paid by the Underwriters to the Company. Any such decrease will not affect the proceeds to be received by the Company.

(2)            The Closing Date in respect of the Offered Shares. Payment of the Offering Price for the Firm Shares, and if applicable, any Additional Shares, shall be made to the Company by wire transfer against delivery of the Firm Shares and, if applicable, Additional Shares, to CFCC on behalf of the Underwriters, through the facilities of CDS designated by the Underwriters, in such names and denominations as the Underwriters may request, and such payment and delivery shall be made by 8:30 a.m. (Toronto time), on October 14, 2020 (respectively, the “Closing Time” and the “Closing Date”) (unless another time and date shall be agreed to by the Co-Lead Underwriters and the Company or unless postponed in accordance with the provisions of Section 18 hereof). The Firm Shares, and Additional Shares, if any, shall be registered in such names and in such denominations as specified by the Co-Lead Underwriters on behalf of the Underwriters. It is understood that CFCC has been authorized, for its own accounts and the accounts of the non-defaulting Underwriters, to accept delivery of and receipt for, and make payment of the Offering Price for, the Offered Shares the Underwriters have agreed to purchase (subject to such adjustment as CFCC may determine to eliminate fractional shares and subject to adjustment in accordance with Section 18 hereof). CFCC, may (but shall not be obligated to) make payment for any Offered Shares to be purchased by any Underwriter whose funds shall not have been received by CFCC by the Closing Date for the account of such Underwriter, but any such payment shall not relieve such Underwriter from any of its obligations under this Agreement.

(3)            Over-Allotment Option. The Over-Allotment Option may be exercised by the Co-Lead Underwriters on behalf of the Underwriters at any time, in whole or in part by delivering notice to the Company not later than 5:00 p.m. (Vancouver time) on the 30th day after the Closing Date, which notice will specify the number of Additional Shares to be purchased by the Underwriters and the date (the “Option Closing Date”) and time (the “Option Closing Time”) on and at which such Additional Shares are to be purchased. Such Option Closing Date may be the same as (but not earlier than) the Closing Date and will not be earlier than two Business Days nor later than five Business Days after the date of delivery of such notice (except to the extent a shorter or longer period shall be agreed to by the Company). Subject to the terms of this agreement, upon the Co-Lead Underwriters furnishing this notice, the Underwriters will be committed to purchase, in the respective percentages set forth in Section 18, and the Company will be committed to issue and sell in accordance with and subject to the provisions of this Agreement, the number of Additional Shares indicated in the notice. Additional Shares may be purchased by the Underwriters only for the purpose of satisfying over-allotments made in connection with the Offering.

(4)            Delivery of the Offered Shares and Closing Mechanics. The Company shall deliver, or cause to be delivered, to CFCC for the accounts of the Underwriters, the Firm Shares, and if applicable, the Additional Shares, at the Closing Date, against the irrevocable release of a wire transfer of immediately available funds for the amount of the Offering Price therefor. The Offered Shares shall be registered in such names and denominations as the Co-Lead Underwriters shall have requested at least one full business day prior to the Closing Date. Deliveries of the documents described in Section 15(1) hereof with respect to the purchase of the Offered Shares shall be made at the offices of Blake, Cassels & Graydon LLP in Toronto, Ontario at 8:30 a.m. (Toronto time), or at such other place as the Co-Lead Underwriters and the Company may agree, on the Closing Date. In the event that the Over-Allotment Option is exercised after the Closing Date in accordance with its terms, the closing of the issuance and sale of that number of Additional Shares in respect of which the Underwriters are exercising the Over-Allotment Option shall take place at the Option Closing Time at the offices of Blake, Cassels & Graydon LLP or at such other place as may be agreed to by the Underwriters and the Company. At the Option Closing Time, the Company shall issue to the Underwriters that number of Additional Shares in respect of which the Underwriters are exercising the Over-Allotment Option and deposit with CDS or its nominee, if requested by the Co-Lead Underwriters, the Additional Shares electronically through the non-certificated inventory system of CDS against payment of $0.37 per Additional Share by wire transfer or certified cheque payable to the Company or as otherwise directed by the Company. Time shall be of the essence, and delivery at the time and place specified in this Agreement is a further condition to the obligations of the Underwriters.

Section 7                  Regulatory Approvals

The Company will make all necessary filings, use its best efforts to obtain all necessary consents and approvals (if any) and pay all filing fees required to be paid in connection with the transactions contemplated by this Agreement. The Company will use its best efforts to qualify the Offered Shares for offering and sale under the Applicable Securities Laws of the Offering Jurisdictions and in such other jurisdictions as the Underwriters may designate and maintain such qualifications in effect for so long as required for the Distribution of the Offered Shares; provided, however, that (i) the Company shall not be obligated to make any material filing, file any prospectus, registration statement or similar document, consent to service of process, or qualify as a foreign corporation or as a dealer in securities in any of such other jurisdictions, or subject itself to taxation in respect of doing business in any of such other jurisdictions in which it is not otherwise so subject, or become subject to any additional periodic reporting or continuous disclosure obligations in such other jurisdictions, and (ii) the Underwriters and the Selling Firms shall comply with the applicable laws in any such designated jurisdiction in making offers and sales of Offered Shares therein.

Section 8                  Representations and Warranties of the Company.

The Company represents and warrants to each of the Underwriters and Cantor Fitzgerald & Co. (“CF US”) and acknowledges that the Underwriters are relying on such representations and warranties in entering into this Agreement. The representations and warranties of the Company contained in this Agreement shall be true as of the date hereof, the Closing Time and Option Closing Time, if applicable, and shall survive the completion of the transactions contemplated under this Agreement and remain in full force and effect thereafter for the benefit of the Underwriters:

In this Agreement, a reference to “knowledge” of the Company, means the knowledge of David Cates, President and Chief Executive Officer, Mac McDonald, Executive Vice-President and Chief Financial Officer and Amanda Willett, Corporate Counsel and Corporate Secretary, in each case, after reasonable inquiry within the scope of such person’s duties.

Any certificate signed by any officer on behalf of the Company or any of the Material Subsidiaries and delivered to the Underwriters or counsel for the Underwriters in connection with the offering of the Offered Shares shall be deemed to be a representation and warranty by the Company or Material Subsidiaries, as the case may be, as to matters covered thereby, to each Underwriter.

The Company acknowledges that the Underwriters and, for purposes of the opinions to be delivered pursuant to Section 15(1) hereof, counsel to the Company and counsel to the Underwriters will rely upon the accuracy and truthfulness of the foregoing representations and hereby consents to such reliance.

Section 9                  Representations, Warranties and Covenants of the Underwriters

(1)                Each Underwriter hereby severally, and not jointly, nor jointly and severally, represents and warrants to the Company that:

(2)                The Underwriters hereby covenant and agree with the Company to the following:

(3)                The Company agrees that the Underwriters are acting severally and not jointly (or jointly and severally) in performing their respective obligations under this Agreement and that no Underwriter shall be liable for any act, omission or conduct by any other Underwriter or another Underwriter’s duly registered broker-dealer affiliate in the United States or any Selling Firm.

(4)                Distribution in Canada. No Underwriter that is a non-resident for purposes of the ITA will render any services under this Agreement in Canada

(5)                Each Underwriter, severally and not jointly, covenants with the Company not to take any action that would result in the Company being required to file with the SEC pursuant to Rule 433-(d) under the Securities Act a free writing prospectus prepared by or on behalf such Underwriter that otherwise would not be required to be filed by the Company thereunder but for the action of the Underwriter.

Section 10              Indemnification

(1)                The Company (referred to in this Section 10 as the (“Indemnifying Party”)) agrees to indemnify and save harmless each of the Underwriters, CF US and their respective affiliates and each of their respective directors, officers, partners, members, employees, shareholders and agents, and each person, if any, who controls the Underwriters within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act (each referred to in this Section 10 as an “Indemnified Party”) from and against all liabilities, claims, losses (other than loss of profits in connection with the distribution of the Offered Shares), actions, suits, proceedings, charges, reasonable costs, damages and reasonable expenses which an Indemnified Party suffers or incurs or is subject to, including all amounts paid to settle actions or satisfy judgments or awards and all reasonable legal fees and expenses that may be incurred in advising with respect to investigating or defending any Claim, in any way caused by, or arising directly or indirectly from, or in consequence of:

provided, however, that the foregoing indemnity (i) shall not apply to any loss, liability, claim, damage or expense to the extent arising out of any untrue statement or omission or alleged untrue statement or omission made solely in reliance upon and in conformity with written information relating to the Underwriters or regarding securities laws and available offering exemptions in jurisdictions other than Canada and the United States furnished to the Company by the Underwriters expressly for use in the Prospectus Supplements or Time of Sale Prospectus and set forth in the “Plan of Distribution” section of the Prospectus Supplements or Time of Sale Prospectus and under “Notice to Investors”, any Issuer Free Writing Prospectus or any Supplementary Materials and (ii) shall cease to apply if and to the extent that a court of competent jurisdiction in a final judgment from which no appeal can be made or a Governmental Authority in a final ruling from which no appeal can be made determines that any loss, liability, claim, damage or expense resulted primarily and directly from the fraud, gross negligence, willful misconduct or bad faith of the Indemnified Party claiming indemnity. For greater certainty, the Company and the Underwriters agree that they do not intend that any failure by the Underwriters to conduct such reasonable investigation as necessary to provide the Underwriters with reasonable grounds for believing the applicable document contained no misrepresentation shall constitute “gross negligence” or “willful misconduct” for purposes of this Section 10 or otherwise disentitle the Underwriters from indemnification hereunder.

(2)                If any matter or thing contemplated by this Section 10 (any such matter or thing being hereinafter referred to as a “Claim”) is asserted against an Indemnified Party, the Indemnified Party shall notify the Indemnifying Party as soon as practicable, of such Claim to the extent allowable by Applicable Law (provided, however, that failure to provide such notice shall not affect the Indemnified Party’s right to indemnification hereunder, except (and only) to the extent of material prejudice (through the forfeiture of substantive rights and defenses) to the Indemnifying Party therefrom) and the Indemnifying Party shall be entitled (but not required) to assume the defence of any suit, action or proceeding brought to enforce such Claim; provided, however, that the defence shall be conducted through legal counsel acceptable to the Indemnified Party and that no admission of liability or settlement of any such Claim may be made by the Indemnifying Party or the Indemnified Party without the prior written consent of the other.

(3)                In any such Claim, the Indemnified Party shall have the right to retain separate counsel to act on its behalf provided that the fees and disbursements of such counsel shall be paid by the Indemnified Party unless:

in each of cases Section 10(3)(a), Section 10(3)(b) and Section 10(3)(c), the Indemnifying Party will not have the right to assume the defence of the suit on behalf of such Indemnified Party, but the Indemnifying Party will be liable to pay the fees and expenses of separate counsel for all Indemnified Parties and, in addition, of local counsel in each applicable jurisdiction. Notwithstanding the foregoing, no settlement may be made by an Indemnified Party without the prior written consent of the Indemnifying Party, which consent will not be unreasonably withheld, conditioned or delayed.

Section 11              Contribution

(1)                In order to provide for a just and equitable contribution in circumstances in which the indemnity provided in Section 10 would otherwise be available in accordance with its terms but is, for any reason, held to be unavailable to or unenforceable by the Indemnified Party or enforceable otherwise than in accordance with its terms or is insufficient to hold the Indemnified Party harmless, the Indemnifying Party shall contribute to the aggregate of all claims, expenses, costs and liabilities and all losses (other than loss of profits in connection with the distribution of the Offered Shares) of the nature contemplated in this Section 11 and suffered or incurred by the Indemnified Parties in such proportions as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other hand from the distribution of the Offered Shares as well as the relative fault of the parties in connection with the Claim or Claims which resulted in such claims, expenses, costs, damages, liabilities or losses, as well as any other equitable considerations determined by a court of competent jurisdiction; provided that: (i) no Underwriter shall in any event be liable to contribute, in the aggregate, any amount in excess of the aggregate fee or any portion thereof actually received by such Underwriter hereunder; and (ii) no party who has been determined by a court of competent jurisdiction in a final judgment that has become non-appealable to have engaged in any fraud, fraudulent misrepresentation, wilful misconduct, gross negligence or bad faith in connection with the Claim or Claims which resulted in such claims, expenses, costs, damages, liabilities or losses shall be entitled to claim contribution from any person who has not been so determined to have engaged in such fraud, fraudulent misrepresentation, wilful misconduct, gross negligence or bad faith in connection with such Claim or Claims.

(2)                The rights of contribution and indemnity provided in this Section 11 shall be in addition to and not in derogation of any other right to contribution and indemnity which the Underwriters may have by statute or otherwise at law.

(3)                The Underwriters’ obligations to contribute pursuant to this Section 11 are several, and not joint, in proportion to their respective underwriting commitments as set forth opposite their respective names in Section 18(1) hereof.

(4)                In the event that any Company Indemnifying Party is held to be entitled to contribution from the Underwriters under the provisions of any Applicable Law, the Company Indemnifying Party shall be limited to contribution in an amount not exceeding the lesser of:

(5)                If the Underwriters have reason to believe that a claim for contribution may arise, they shall give the Indemnifying Party notice thereof in writing, but failure to notify the Indemnifying Party shall not relieve the Indemnifying Party of any obligation which it may have to the Underwriters under this Section 11, except (and only) to the extent of material prejudice (through the forfeiture of substantive rights and defenses) to the Indemnifying Party therefrom.

(6)                With respect to Section 10 and this Section 11, the Company acknowledges and agrees that the Underwriters are contracting on their own behalf and as agents for their respective affiliates, directors, officers, employees and agents, and each person, if any, controlling any Underwriter or any of its subsidiaries and each shareholder of any Underwriter. Accordingly, the Company hereby constitutes the Underwriters as agents for each person who is entitled to the covenants of the Company contained in Section 10 and this Section 11 and is not a party hereto and the Underwriters agree to accept such agents and to hold in trust for and to enforce such covenants on behalf of such persons.

Section 12              Certain Covenants of the Company.

The Company further covenants and agrees with each Underwriter and CF US as follows:

The Co-Lead Underwriters, on behalf of the Underwriters, may, in their sole discretion, waive in writing the performance by the Company of any one or more of the foregoing covenants or extend the time for their performance.

Section 13              All Terms to be Conditions

The Company agrees that the conditions contained in this Agreement will be complied with insofar as the same relate to acts to be performed or caused to be performed by the Company. Any breach or failure to comply with any of the conditions set out in this Agreement shall entitle any of the Underwriters to terminate their obligation to purchase the Offered Shares, by written notice to that effect given to the Company at or prior to the Closing Time or the Option Closing Time, as applicable. It is understood that the Underwriters may waive, in whole or in part, or extend the time for compliance with, any of such terms and conditions without prejudice to the rights of the Underwriters in respect of any such terms and conditions or any other or subsequent breach or non-compliance, provided that to be binding on any Underwriter any such waiver or extension must be in writing and signed by such Underwriter.

Section 14              Termination of this Agreement.

(1)                Each Underwriter shall also be entitled to terminate its obligation to purchase the Offered Shares by written notice to that effect to the Company at or prior to the Closing Time or the Option Closing Time, as applicable, if:

(2)                If this Agreement is terminated by any of the Underwriters pursuant to Section 14(1), there shall be no further liability on the part of such Underwriter or of the Company to such Underwriter, except in respect of any liability which may have arisen or may thereafter arise under Section 10, Section 11 and Section 16.

(3)                The right of the Underwriters or any of them to terminate their respective obligations under this Agreement is in addition to such other remedies as they may have in respect of any default, act or failure to act of the Company in respect of any of the matters contemplated by this Agreement. A notice of termination given by one Underwriter under this Section 14 shall not be binding upon the other Underwriters.

Section 15              Conditions of Closing and Option Closing

(1)                The obligations of the Underwriters under this Agreement are subject to the accuracy of the representations and warranties of the Company contained in this Agreement both as of the date of this Agreement, the Closing Time and the Option Closing Time, the performance by the Company of its obligations under this Agreement and receipt by the Underwriters, at the Closing Time or Option Closing Time, as applicable, of:

Section 16              Expenses

The Company will pay all expenses and fees in connection with the Offering, including, without limitation: (i) all expenses of or incidental to the creation, issue, sale or distribution of the Offered Shares and the filing of the Prospectus Supplements, marketing materials and any Supplementary Material; (ii) the fees and expenses of the Company’s legal counsel; (iii) all costs incurred in connection with the preparation of documentation relating to the Offering; and (iv) all reasonable and direct and documented out-of-pocket expenses of the Underwriters and (v) all reasonable and documented fees and disbursements of the Underwriters’ legal counsel to a maximum of $90,000, plus applicable taxes and disbursements ((iv) and (v), collectively, the “Underwriters’ Expenses”). All Underwriters’ Expenses incurred by the Underwriters, or on their behalf, shall be payable by the Company immediately upon receiving an invoice therefor from the Underwriters and shall be payable whether or not an offering is completed. At the option of the Co-Lead Underwriters, such fees and expenses may be deducted from the gross proceeds otherwise payable to the Company on the closing of the Offering. Regardless of whether the transactions contemplated herein are completed or not, the Company will pay the Underwriters’ Expenses, as described in this Section 16.

Section 17              No Advisory or Fiduciary Relationship

The Company acknowledges and agrees that (a) the purchase and sale of the Offered Shares pursuant to this Agreement, including the determination of the Offering Price of the Offered Shares and any related discounts and commissions, is an arm’s-length commercial transaction between the Company, on the one hand, and the several Underwriters, on the other hand, (b) in connection with the Offering and the process leading to such transaction each Underwriter is and has been acting solely as a principal and is not the agent or fiduciary of the Company or its shareholders, creditors, employees or any other party, (c) no Underwriter has assumed or will assume an advisory or fiduciary responsibility in favour of the Company with respect to the Offering or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) and no Underwriter has any obligation to the Company with respect to the Offering except the obligations expressly set forth in this Agreement, (d) the Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company, and (e) the Underwriters have not provided any legal, accounting, regulatory or tax advice with respect to the Offering and the Company has consulted its own legal, accounting, regulatory and tax advisors to the extent it deems appropriate.

Section 18              Obligation to Purchase.

(1)                Subject to the terms of this Agreement, the Underwriters’ obligations under this Agreement to purchase the Offered Shares shall be several and not joint and several and the liability of each of the Underwriters to purchase the Offered Shares shall be limited to the following percentages of the purchase price paid for the Offered Shares:

(2)                If any of the Underwriters fails to purchase its applicable percentage of the Offered Shares at the Closing Time or the Option Closing Time, as the case may be, (a “Defaulting Underwriter”) and the percentage of Offered Shares that have not been purchased by the Defaulting Underwriter represents 10% or less of the Offered Shares then the other Underwriters will be severally, and not jointly and severally, obligated to purchase, on a pro rata basis to their respective percentages as aforesaid, all but not less than all of the Offered Shares not purchased by the Defaulting Underwriter, and to receive the Defaulting Underwriter’s portion of the Underwriting Fee in respect thereof, and such non-defaulting Underwriters shall have the right, by notice to the Company, to postpone the Closing Date or Option Closing Date, as the case may be, by not more than three Business Days to effect such purchase. In the event that the percentage of Offered Shares that have not been purchased by a Defaulting Underwriter represents more than 10% of the aggregate Offered Shares, the other Underwriters will have the right, but will not be obligated, to purchase all of the percentage of the Offered Shares which would otherwise have been purchased by the Defaulting Underwriter; the Underwriters exercising such right will purchase such Offered Shares, if applicable, pro rata to their respective percentages aforesaid or in such other proportions as they may otherwise agree. In the event that such right is not exercised, the non-defaulting Underwriters shall be relieved of all obligations to the Company arising from such default. Nothing in this section shall oblige the Company to sell to the Underwriters less than all of the Offered Shares or relieve from liability to the Company any Underwriter which shall be so in default.

Section 19              Survival

The representations, warranties, obligations and agreements of the Company and of the Underwriters contained herein or delivered pursuant to this Agreement shall survive the purchase by the Underwriters of the Offered Shares and shall continue in full force and effect notwithstanding any subsequent disposition by the Underwriters of the Offered Shares and the Underwriters shall be entitled to rely on the representations and warranties of the Company contained in or delivered pursuant to this Agreement notwithstanding any investigation which the Underwriters may undertake or which may be undertaken on the Underwriters’ behalf.

Section 20              Notices.

Any notice to be given hereunder shall be in writing and may be given by facsimile or by hand delivery and shall, in the case of notice to the Company, be addressed and faxed or delivered to:

Denison Mines Corp.

40 University Avenue, Suite 1100

Toronto, Ontario M5J 1T1

Attention:          David Cates
Facsimile:           (778) 729-0650

with a copy to (such copy not to constitute notice):

Blake, Cassels & Graydon LLP
Suite 2600

595 Burrard Street
Vancouver, British Columbia V7X 1L3

Attention:          Trisha Robertson
Facsimile:           (604) 631-3309

and in the case of the Underwriters and CF US, c/o CFCC, addressed and faxed or delivered to:

Cantor Fitzgerald Canada Corporation

181 University Avenue, Suite 1500

Toronto, Ontario M5H 3M7

Attention:          Christopher Craib and Graham Moylan

Facsimile:           (416) 350-2985

and

Cantor Fitzgerald & Co.

110 East 59^th Street

New York, NY 10022

Attention:          Legal Department

Facsimile:           (212) 829-4708

and

Haywood Securities Inc.

200 Burrard Street, Suite 700

Vancouver, British Columbia V6C 3L6

Attention:          Kevin Campbell

Facsimile:           (604) 697-7495

with a copy to (such copy not to constitute notice):

McMillan LLP
Suite 1500, Royal Centre
1055 West Georgia Street
Vancouver, British Columbia V6E 4N7

Attention:          Michael Taylor and Andrew Spencer
Facsimile:           (604) 685-7084

The Company and the Underwriters may change their respective addresses for notice by notice given in the manner referred to above.

Section 21              Actions on Behalf of the Underwriters.

All steps which must or may be taken by the Underwriters in connection with this Underwriting Agreement, with the exception of the matters contemplated by Section 10, Section 13 and Section 14, shall be taken by the Co-Lead Underwriters on the Underwriters’ behalf and the execution of the Agreement by the Underwriters shall constitute the Company’s authority for accepting notification of any such steps from, and for giving notice to, and for delivering any definitive certificate(s) representing the Offered Shares to, or to the order of, the Co-Lead Underwriters.

In connection with the distribution of the Offered Shares, the Underwriters (or any of them) may effect transactions which stabilize or maintain the market price of the Common Shares at levels other than those which might otherwise prevail in the open market, but in each case as permitted by Applicable Securities Laws. Such stabilizing transactions, if any, may be discontinued by the Underwriters at any time.

Any and all previous agreements with respect to the purchase and sale of the Offered Shares, whether written or oral, are terminated and this Agreement constitutes the entire agreement between the Company and the Underwriters with respect to the purchase and sale of the Offered Shares.

This Agreement shall be governed by and construed in accordance with the laws in force in the Province of Ontario and the federal laws of Canada applicable therein.

Time shall be of the essence of this Agreement. This Agreement may be executed in counterparts, each of which when so executed shall be deemed to be an original and such counterparts together shall constitute one and the same instrument.

If the foregoing is in accordance with your understanding and is agreed to by you, will you please confirm your acceptance by signing the enclosed copies of this letter at the place indicated and returning the same to us.

Yours very truly,

Acknowledged by CF US solely for the purpose of receiving the benefit of Section 8 of this Agreement.

The foregoing is in accordance with our understanding and is accepted by us.

SCHEDULE “A”
Material Subsidiaries

SCHEDULE “B”
MATTERS TO BE ADDRESSED IN THE COMPANY’S CANADIAN COUNSEL OPINION

SCHEDULE “C”
FORM OF OPINION TO BE PROVIDED BY COMPANY’S U.S. COUNSEL

Legal counsel will also state in a separate letter as follows, on the basis of the customary assumptions and qualifications set forth in the letter:

Schedule “D”
Form of Lock-Up Agreement

__________________, 2020

The undersigned understands that this lock-up agreement (the “Lock-Up Agreement”) is being delivered to you in connection with the Underwriting Agreement dated _________, 2020 (the “Underwriting Agreement”) entered into by Denison Mines Corp. (the “Company”) and the Underwriters (as defined in the Underwriting Agreement), with respect to the public offering (the “Offering”) of common shares of the Company (the “Common Shares”).

In consideration of the benefit that the Offering will confer upon the undersigned as a [director and/or officer] of the Company, and for other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the undersigned agrees that, in respect of Common Shares owned directly or indirectly by the undersigned, or under control or direction of the undersigned (including holding as a custodian) or with respect to which the undersigned has beneficial ownership (as such term is used in Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) (collectively, the “Locked-Up Securities”), during the period beginning from the date hereof and ending on the day that is ninety (90) days following the date of the closing of the Offering (the “Lock-Up Period”), the undersigned will not, without the prior written consent of the Co-Lead Underwriters, which consent shall not unreasonably be delayed, conditioned or withheld, (i) issue, offer, sell (including, without limitation, any short sale), contract or agree to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of or agree to dispose of or transfer, directly or indirectly, or establish or increase a “put equivalent position” or liquidate or decrease a “call equivalent position” within the meaning of Section 16 of the Exchange Act, with respect to, any Locked-Up Securities, or any securities convertible into or exchangeable or exercisable for, or warrants or other rights to purchase, the foregoing, (ii) except as permitted in the Underwriting Agreement, cause to become effective a registration statement under the United States Securities Act of 1933, as amended, together with the rules and regulations promulgated thereunder (the “Securities Act”), or to file a prospectus in Canada, relating to the offer and sale of any Locked-Up Securities or securities convertible into or exercisable or exchangeable for Locked-Up Securities or other rights to purchase Locked-Up Securities or any other securities of the Company that are substantially similar to the Locked-Up Securities, or any securities convertible into or exchangeable or exercisable for, or any warrants or other rights to purchase, the foregoing, (iii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Locked-Up Securities or any other securities of the Company that are substantially similar to the Locked-Up Securities, or any securities convertible into or exchangeable or exercisable for, or any warrants or other rights to purchase, the foregoing, whether any such transaction is to be settled by delivery of Common Shares or such other securities, in cash or otherwise or (iv) publicly announce an intention to effect any transaction specified in clause (i), (ii) or (iii).

The foregoing paragraph shall not apply to:

Nothing contained herein will restrict the undersigned from exercising securities convertible into or exchangeable or exercisable for, or any warrants or other rights to purchase, Common Shares, provided that the underlying Common Shares are treated as Locked-Up Securities for the purposes of this Agreement.

In addition, the undersigned hereby waives any and all pre-emptive rights, participation rights, resale rights, rights of first refusal and similar rights that the undersigned may have in connection with the Offering or with any issuance or sale by the Company of any equity or other securities in connection with the Offering.

The undersigned hereby confirms that the undersigned has not, directly or indirectly, taken, and hereby covenants that the undersigned will not, directly or indirectly, take, any action designed, or which has constituted or will constitute or might reasonably be expected to cause or result in the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Common Shares.

The undersigned understands that the Company and the Underwriters are relying upon this Lock-Up Agreement in proceeding toward the consummation of the Offering. The undersigned further understands that this Lock-Up Agreement is irrevocable and shall be binding upon the undersigned’s legal representatives, successors, and assigns, and shall enure to the benefit of the Company, the Underwriters and their legal representatives, successors and assigns.

The obligations of the undersigned pursuant to this Lock-Up Agreement may be waived in writing in whole or in part by the Co-Lead Underwriters in its sole discretion.

This Lock-Up Agreement is governed by the laws of the Province of Ontario and the laws of Canada applicable therein.

Yours very truly,

Acknowledged and agreed as of the date first written above.