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Denison Announces Overnight Marketed Offering

Financings

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Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

PRESS RELEASE

DENISON ANNOUNCES OVERNIGHT MARKETED OFFERING

Toronto, ON – March 25, 2020. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN:

NYSE American) announces that the Company is undert aking an overnight marketed public offering of

common shares (the “Offered Shares”) of the Company for minimum gross proceeds of US$4.0 million (the

“Offering”).

The Offering is expected to be completed pursuant to an underwriting agreement to be entered into between

the Company and Cantor Fitzgerald Canada Corporatio n (“CFCC”) and Haywood Securities Inc., as co-

lead underwriters, and a syndicate of underwriters (collectively, the “Underwriters”). CFCC will act as sole

bookrunner. The Offering will be made in the United States through CFCC’s U.S. affiliate, Cantor Fitzgerald

& Co. The price and number of Offered Shares to be sold will be determined in the course of marketing

and there can be no assurance as to whether or when the Offering will be completed.

In addition, Denison will grant the Underwriters an over-allotment option (the “Over-Allotment Option” )

exercisable, in whole or in part, in the sole discr etion of the Underwriters, to purchase up to an add itional

15% of the number of Offered Shares sold in the Off ering for up to 30 days after the closing, on the s ame

terms and conditions as the Offering.

The Company will pay the Underwriters a cash commis sion equal to 6.0% of the gross proceeds of the

Offering, including proceeds received from the exer cise of the Over-Allotment Option, at the closing o f the

Offering.

The Offered Shares will be offered by way of a short form prospectus in all provinces of Canada (other than

Quebec), and will be offered in the United States p ursuant to a prospectus filed as part of a registra tion

statement under the Canada/U.S. multi-jurisdictiona l disclosure system. A registration statement on Fo rm

F-10 relating to these securities has been filed with the United States Securities and Exchange Commission

(the “SEC”) but has not yet become effective. The s ecurities may not be sold nor may offers to buy be

accepted in the United States prior to the time the registration statement becomes effective. This new s

release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of

the Offered Shares in any jurisdiction in which suc h offer, solicitation or sale would be unlawful pri or to

registration or qualification under the securities laws of that jurisdiction. The Offered Shares have not been

approved or disapproved by any regulatory authority , nor has any such authority passed upon by the

accuracy or adequacy of the prospectus or the registration statement.

The Offering is expected to close on or about April 9, 2020 and is subject to certain conditions inclu ding,

but not limited to, the receipt of all necessary regulatory approvals including, but not limited to, the approval

of the Toronto Stock Exchange and the NYSE American stock exchange. Proceeds of the Offering are

anticipated to be used to fund Denison’s business a ctivities planned for the remainder of 2020 and int o

2021, as well as for general working capital purposes, as more fully described in the preliminary short form

prospectus.

The preliminary short form prospectus is available on SEDAR at www.sedar.com. The registration

statement on Form F-10, including the U.S. form of the preliminary short form prospectus, is available on

the SEC’s website at www.sec.gov. Alternatively, a written prospectus relating to the Offering may be

obtained upon request by contacting the Company or Cantor Fitzgerald Canada Corporation in Canada,

attention: Equity Capital Markets, 181 University A venue, Suite 1500, Toronto, ON, M5H 3M7, email:

[email protected]; or Cantor Fitzgerald & Co., Attention: Equity Capital Markets, 499 Park Avenue,

6th Floor, New York, New York, 10022 or by email at [email protected].

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About Denison

Denison is a uranium exploration and development company with interests focused in the Athabasca Basin

region of northern Saskatchewan, Canada. Denison’s Athabasca Basin exploration portfolio consists of

numerous projects covering approximately 280,000 he ctares. The Company's flagship project is the 90%

owned Wheeler River Uranium Project. Denison’s interests in the Athabasca Basin also include a 22.5%

ownership interest in the McClean Lake joint ventur e (“MLJV”), which includes several uranium deposits

and the McClean Lake uranium mill, which is current ly processing ore from the Cigar Lake mine under a

toll milling agreement, plus a 25.17% interest in the Midwest and Midwest A deposits, and a 66.57% interest

in the J Zone and Huskie deposits on the Waterbury Lake property. Each of Midwest, Midwest A, J Zone

and Huskie are located within 20 kilometres of the McClean Lake mill.

Denison is engaged in mine decommissioning and environmental services through its Closed Mines group

(formerly Denison Environmental Services), which manages Denison's Elliot Lake reclamation projects and

provides post-closure mine care and maintenance services to a variety of industry and government clients.

Denison is also the manager of Uranium Participatio n Corp., a publicly traded company which invests in

uranium oxide and uranium hexafluoride.

For more information, please contact

David Cates (416) 979-1991 ext 362

President and Chief Executive Officer

Sophia Shane (604) 689-7842

Investor Relations

Follow Denison on Twitter @DenisonMinesCo

Cautionary Statement Regarding Forward-Looking Statements

Certain information contained in this news release constitutes ‘forward-looking information’, within the meaning of the applicable United

States and Canadian legislation concerning the business, operations and financial performance and condition of Denison.

Generally, these forward-looking statements can be identified by the use of forward-looking terminolog y such as ‘plans’, ‘expects’,

‘budget’, ‘scheduled’, ‘estimates’, ‘forecasts’, ‘intends’, ‘anticipates’, or ‘believes’, or the negatives and/or variations of such words and

phrases, or state that certain actions, events or r esults ‘may’, ‘could’, ‘would’, ‘might’ or ‘will be taken’, ‘occur’, ‘be achieved’ or ‘has

the potential to’.

In particular, this news release contains forward-looking information pertaining to the following: the Offering, and the proposed terms

and completion thereof; the proposed use of proceed s of the Offering, assuming its completion; evaluat ion and development plans

and objectives; and expectations regarding its joint venture ownership interests and the continuity of its agreements with its partners.

Forward looking statements are based on the opinions and estimates of management as of the date such statements are made, and

they are subject to known and unknown risks, uncert ainties and other factors that may cause the actual results, level of activity,

performance or achievements of Denison to be materi ally different from those expressed or implied by s uch forward-looking

statements. For example, if market conditions remai n volatile and/or COVID-19 mitigation measures resu lt in more social and

economic disruptions, Denison may not be able to co mplete the Offering on the terms herein described o r at all, which could have

significant impacts on Denison and its ability to continue as a going concern. Denison believes that the expectations reflected in this

forward-looking information are reasonable but no a ssurance can be given that these expectations will prove to be accurate and

results may differ materially from those anticipated in this forward-looking information. For a discussion in respect of risks and other

factors that could influence forward-looking events, please refer to the factors discussed in Denison’s Annual Information Form dated

March 13, 2020 under the heading ‘Risk Factors’. These factors are not, and should not, be construed as being exhaustive.

Accordingly, readers should not place undue relianc e on forward-looking statements. The forward-lookin g information contained in

this news release is expressly qualified by this cautionary statement. Any forward-looking information and the assumptions made with

respect thereto speaks only as of the date of this news release. Denison does not undertake any obligation to publicly update or revise

any forward-looking information after the date of t his news release to conform such information to act ual results or to changes in

Denison's expectations except as otherwise required by applicable legislation.