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COSA.V ·

Cosa Announces Closing of Upsized C$12 Million Bought Deal Private Placement

Financings

Cosa Announces Closing of Upsized C$12

Million Bought Deal Private Placement

Vancouver, British Columbia--(Newsfile Corp. - June 24, 2026) -

Cosa Resources Corp. (TSXV:

COSA) (OTCQB: COSAF) (FSE: SSKU)

("

Cosa

" or the "

Company

") is pleased to announce the

closing of its previously announced "bought deal" private placement of (i) 5,835,000 common shares of

the Company (the "

Non-FT Shares

") at a price of C$0.60 per Non-FT Share, (ii) 3,045,000

Saskatchewan charity flow-through common shares of the Company (the "

Saskatchewan Charity FT

Shares

") at a price of C$0.99 per Saskatchewan Charity FT Share, (iii) 4,020,000 national charity flow-

through common shares of the Company (the "

National Charity FT Shares

" and together with the

Saskatchewan Charity FT Shares, the "

Charity FT Shares

") at a price of C$0.87 per National Charity

FT Share and (iv) 2,860,000 flow-through common shares of the Company (the "

FT Shares

", and

together with the Non-FT Shares and Charity FT Shares, the "

Offered Securities

") at a price of C$0.70

per FT Share, for aggregate gross proceeds to the Company of C$12,014,950 (the "

Offering

").

The Offering was led by Velocity Capital Partners, as sole bookrunner,

and Haywood Securities Inc., as

co-lead underwriter, on behalf of a syndicate of underwriters including Canaccord Genuity Corp.

(collectively, the "

Underwriters

").

Cosa's largest shareholder, Denison Mines Corp. (TSX:

DML

, NYSE American:

DNN

) ("

Denison

"),

participated in the Offering pursuant to its pre-emptive and top-up rights under the investor rights

agreement between Denison and Cosa dated January 14, 2025 (the "

Investor Rights Agreement

").

Immediately following the closing of the Offering, Denison owns 17.7% of Cosa on a partially-diluted

basis. Denison is a leading Athabasca Basin-focused uranium mining, development, and exploration

company with a market capitalization of over C$4.0 billion. Denison's current focus is advancing the

development-stage Wheeler River project, which represents one of the largest undeveloped uranium

mining projects in the infrastructure rich eastern portion of the Athabasca Basin.

Each Charity FT Share and FT Share will qualify as a "flow-through share" within the meaning of the

Income Tax Act

(Canada), and in respect of the Saskatchewan Charity FT Shares and FT Shares

issued to subscribers resident in Saskatchewan, will qualify as an "eligible flow-through share" as

defined in

The Mineral Exploration Tax Credit Regulations, 2014

(Saskatchewan).

The Company intends to use (i) the net proceeds from the sale of Non-FT Shares to fund exploration and

development and for additional working capital purposes, and (ii) the gross proceeds from the sale of

Charity FT Shares and FT Shares to incur eligible "Canadian exploration expenses" that qualify as "flow-

through critical mineral mining expenditures" as such terms are defined in the

Income Tax Act

(Canada)

and, in respect of the gross proceeds received from subscribers of the Saskatchewan Charity FT

Shares and FT Shares resident in Saskatchewan, to incur "eligible flow-through mining expenditures"

pursuant to

The Mineral Exploration Tax Credit Regulations, 2014

(Saskatchewan) (collectively, the

"

Qualifying Expenditures

") related to the Company's uranium projects in the Athabasca Basin,

Saskatchewan, on or before December 31, 2027, all as further set out in the amended and restated

offering document of the Company dated June 4, 2026. All Qualifying Expenditures will be renounced in

favour of the subscribers of Charity FT Shares and FT Shares effective December 31, 2026. In the event

that the Company does not renounce on or prior to December 31, 2026 Qualifying Expenditures in

amount equal to the gross proceeds of the Charity FT Shares and FT Shares purchased and/or if the

amount of the Qualifying Expenditures is reduced upon assessment or reassessment by the Canada

Revenue Agency, the Company will indemnify each Charity FT Share and FT Share initial subscriber for

the additional income taxes payable by such initial subscriber as a result of the Company's failure to

renounce the Qualifying Expenditures or as a result of the reduction.

The Non-FT Shares and Charity FT Shares were sold in reliance on the "listed issuer financing

exemption" under Section Part 5A.2 of NI 45-106, as amended by Coordinated Blanket Order 45-935 -

Exemptions from Certain Conditions of the Listed Issuer Financing Exemption

to purchasers. The

Non-FT Shares and Charity FT Shares are not subject to a hold period in Canada, other than 778,400

Non-FT Shares and 384,050 FT Shares sold to insiders of the Company as further described below,

which are subject to a hold period ending October 25, 2026 in accordance with the policies of the TSX

Venture Exchange (the "

TSXV

"). The FT Shares are subject to a hold period in Canada ending October

25, 2026.

In connection with the Offering, the Company paid the Underwriters an aggregate cash commission of

C$570,747.50 and issued to the Underwriters an aggregate of 795,600 non-transferable compensation

warrants of the Company (the "

Compensation Warrants

"). Each Compensation Warrant entitles the

holder to acquire one common share in the capital of the Company (a "

Compensation Warrant

Share

") at an exercise price of C$0.60 per Compensation Warrant Share until June 24, 2028. The

Compensation Warrants and any Compensation Warrant Shares issued pursuant to the exercise thereof

are subject to a hold period ending October 25, 2026.

Certain directors and officers of the Company, Denison, and a certain director and officer of Denison

participated in the Offering and acquired an aggregate of 778,400 Non-FT Shares and 363,700 FT

Shares for aggregate gross proceeds of C$721,630. The participation of such insiders in the Offering

constitutes a "related party transaction" within the meaning of Multilateral Instrument 61-101 -

Protection

of Minority Security Holders in Special Transactions

("

MI 61-101

"). The Company has determined that

the transaction is exempt from the formal valuation and minority shareholder approval requirements of MI

61-101 by virtue of the exemptions contained in Section 5.5(a) and Section 5.7(1)(a) of MI 61-101, as

neither the fair market value of securities issued to such persons nor the consideration paid by such

persons exceeded 25% of the Company's market capitalization. The Company did not file a material

change report in respect of the transaction 21 days in advance of closing of the Offering because the

details of the Offering and insider participation had not been confirmed and the shorter period was

necessary in order to permit the Company to close the Offering in a timeframe consistent with usual

market practice for transactions of this nature.

The Offering remains subject to the final approval of the TSXV.

Denison will be filing an early warning report, under National Instrument 62-103 - The Early Warning

System and Related Take-Over Bid and Insider Reporting Issues, in respect of the acquisition by

Denison of 750,000 Non-FT Shares on closing of the Offering. Immediately prior to the closing of the

Offering, Denison had beneficial ownership of, or control and direction over, 20,990,864 common shares

in the capital of Cosa (each a "

Share

") and 2,417,679 Share purchase warrants, representing 17.7% of

issued and outstanding Shares, and 13.9% of the issued and outstanding Share purchase warrants of

Cosa, respectively. Immediately following the closing of the Offering, Denison had beneficial ownership

of, or control and direction over, 21,740,864 Shares and 2,417,679 Share purchase warrants,

representing 16.2% of issued and outstanding Shares and 13.3% of issued and outstanding Share

purchase warrants of Cosa, respectively. The Non-FT Shares were acquired by Denison for investment

purposes. Denison intends to review, on a continuous basis, various factors related to its investment in

Cosa, and may decide to acquire or dispose of additional securities of Cosa as future circumstances

may dictate, including pursuant to the exercise of warrants, the terms of the Acquisition Agreement

between Denison and Cosa dated November 26, 2024 and/or its pre-emptive rights under the Investor

Rights Agreement. Further information is available in Cosa's press release dated January 14, 2025, in

the early warning report to be filed by Denison under Cosa's profile on SEDAR+ or by contacting

Denison:

Geoff Smith, Vice President Corporate Development & Commercial

Denison Mines Corp.

[email protected]

Suite 1100 - 40 University, Toronto, Ontario M5J 1T1

The Offered Securities described in this news release have not been, nor will they be, registered under

the United States Securities Act of 1933, as amended (the "

U.S. Securities Act

"), or any United States

state securities laws, and may not be offered or sold, directly or indirectly, within the United States or to,

or for the account or benefit of, U.S. persons absent registration or an exemption from registration

requirements. This news release does not constitute an offer for sale of securities, nor a solicitation for

offers to buy any securities in the United States, not in any other jurisdiction in which such offer,

solicitation or sale would be unlawful. The terms "United States" and "U.S. person" used herein are as

defined in Regulation S under the U.S. Securities Act.

About Cosa Resources Corp.

Cosa Resources is a Canadian uranium exploration company operating in northern Saskatchewan. The

portfolio comprises roughly 237,000 ha across multiple underexplored 100% owned and Cosa-operated

joint venture projects in the Athabasca Basin region, the majority of which reside within or adjacent to

established uranium corridors.

In January of 2025, the Company entered a transformative strategic collaboration with Denison (TSX:

DML) (NYSE American: DNN) that has secured access to several additional highly prospective eastern

Athabasca uranium exploration projects. As Cosa's largest shareholder, Denison gains exposure to

Cosa's potential for exploration success and its pipeline of uranium projects.

The Company's primary focus through the remainder of 2026 will be drilling at the Murphy Lake North

and Darby projects in the eastern Athabasca Basin. Drilling at Murphy Lake North will follow up uranium

mineralization within an extensive zone of strong structure and hydrothermal alteration at the Cyclone

trend. Drilling at Darby will follow up on intersections of anomalous geochemistry, structure, and zones of

hydrothermal alteration from both winter 2026 drilling and historical drilling.

Cosa's award-winning management team has a track record of success in Saskatchewan. In 2022,

members of the Cosa team were awarded the AME Colin Spence Award for the discovery of the

Hurricane uranium deposit. Cosa personnel led teams or had integral roles in the discovery of Denison's

Gryphon deposit and held key roles in the founding of both NexGen and IsoEnergy.

Contact

Keith Bodnarchuk, President & CEO

[email protected]

+1 888-899-2672 (COSA)

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the

policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this

release.

Forward-Looking Information

This press release contains "forward-looking information" within the meaning of applicable Canadian

securities laws. Any statements that express or involve discussions with respect to predictions,

expectations, beliefs, plans, projections, objectives, assumptions or future events or performance

(often, but not always, identified by words or phrases such as "believes", "anticipates", "expects", "is

expected", "scheduled", "estimates", "pending", "intends", "plans", "forecasts", "targets", or "hopes",

or variations of such words and phrases or statements that certain actions, events or results "may",

"could", "would", "will", "should" "might", "will be taken", or "occur" and similar expressions) are not

statements of historical fact and may be forward-looking statements. Forward-looking information

herein includes, but is not limited to, statements that address activities, events or developments that

Cosa expects or anticipates will or may occur in the future including the proposed use of proceeds of

the Offering, the tax treatment of the Charity FT Shares and FT Shares and the final approval of the

Offering by the TSXV.

Forward-looking statements and forward-looking information relating to any future mineral production,

liquidity, enhanced value and capital markets profile of the Company, future growth potential for the

Company and its business, and future exploration plans are based on management's reasonable

assumptions, estimates, expectations, analyses and opinions, which are based on management's

experience and perception of trends, current conditions and expected developments, and other

factors that management believes are relevant and reasonable in the circumstances, but which may

prove to be incorrect. Assumptions have been made regarding, among other things, the price of

metals; costs of exploration and development; the estimated costs of development of exploration

projects; the Company's ability to operate in a safe and effective manner.

These statements reflect the Company's respective current views with respect to future events and are

necessarily based upon a number of other assumptions and estimates that, while considered

reasonable by management, are inherently subject to significant business, economic, competitive,

political and social uncertainties and contingencies. Many factors, both known and unknown, could

cause actual results, performance, or achievements to be materially different from the results,

performance or achievements that are or may be expressed or implied by such forward-looking

statements or forward-looking information and the Company has made assumptions and estimates

based on or related to many of these factors. Such factors include, without limitation: the future tax

treatment of the Charity FT Shares and FT Shares, competitive risks and the availability of financing;

precious metals price volatility; risks associated with the conduct of the Company's mining activities;

regulatory, consent or permitting delays; risks relating to reliance on the Company's management

team and outside contractors; the Company's inability to obtain insurance to cover all risks, on a

commercially reasonable basis or at all; currency fluctuations; risks regarding the failure to generate

sufficient cash flow from operations; risks relating to project financing and equity issuances; risks and

unknowns inherent in all mining projects; contests over title to properties, particularly title to

undeveloped properties; laws and regulations governing the environment, health and safety;

operating or technical difficulties in connection with mining or development activities; employee

relations, labour unrest or unavailability; the Company's interactions with surrounding communities;

the speculative nature of exploration and development; stock market volatility; conflicts of interest

among certain directors and officers; lack of liquidity for shareholders of the Company; litigation risk;

and the factors identified in the Company's public disclosure documents. Readers are cautioned

against attributing undue certainty to forward-looking statements or forward-looking information.

Although the Company has attempted to identify important factors that could cause actual results to

differ materially, there may be other factors that cause results not to be anticipated, estimated or

intended. The Company does not intend, and does not assume any obligation, to update these

forward-looking statements or forward-looking information to reflect changes in assumptions or

changes in circumstances or any other events affecting such statements or information, other than as

required by applicable law.

NOT FOR DISTRIBUTION TO U.S. NEWSWIRE SERVICES OR FOR DISSEMINATION IN THE

UNITED STATES

To view the source version of this press release, please visit

https://www.newsfilecorp.com/release/302651