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OSISKO DEVELOPMENT CORP. AND O3 MINING INC. ANNOUNCE FORMATION OF "ELECTRIC ELEMENTS MINING CORP." TO EXPLORE JAMES BAY PROPERTIES FOR LITHIUM Creation of Premier Lithium Exploration Company in James Bay Region Fully-Subscribed C$4.1 Million Financing to Fund First Phase of Lithium Exploration Progr

Financings

OSISKO DEVELOPMENT CORP. AND O3 MINING INC. ANNOUNCE

FORMATION OF "ELECTRIC ELEMENTS MINING CORP."

TO EXPLORE JAMES BAY PROPERTIES FOR LITHIUM

Creation of Premier Lithium Exploration Company in James Bay Region

Fully-Subscribed C$4.1 Million Financing to Fund First Phase of Lithium Exploration Program

Continued Exposure to and Advancement of Highly Prospective Lithium Exploration Assets

Through Equity Ownership Interest in Electric Elements by Osisko Development and O3 Mining

Toronto, Ontario and Montréal, Québec , November 15th, 2023 – Osisko Development Corp. ("Osisko

Development") (NYSE: ODV, TSXV: ODV) and O3 Mining Inc. ("O3 Mining") (TSXV: OIII, OTCQX: OIIIF)

are pleased to anno unce the successful formation and capitalization of "Electric Elements Mining Corp."

("Electric Elements") to explore for lithium potential on certain James Bay properties in Eeyou Istchee

Area, Nunavik, Québec transferred to Electric Elements by Osisko Development and O3 Mining (the "Spin-

out Transaction").

Spin-Out Transaction

Pursuant to the Spin-out Transaction, Electric Elements acquired from:

(i) Osisko Development, all of its shares and partnership units in certain subsidiaries holding the

rights and title to and interest in its James Bay properties, in exchange for the issuance by Electric

Elements to Osisko Development of 9,599,999 common shares of E lectric Elements ("EEM

Shares"); and

(ii) O3 Mining, all of its rights and title to and interest in its Élé onore Opinaca property, in exchange

for 2,400,000 EEM Shares (the "Transfer").

After giving effect to the Transfer, Osisko Development and O3 Mining held 80% and 20%, respectively, of

the outstanding EEM Shares.

The assets transferred to Electric Elements consist of: (i) all of the issued and outstanding shares of Coulon

Mines Inc., formerly a wholly-owned subsidiary of Osisko Development; (ii) all of the issued and outstanding

common shares of 9852239 Canada Inc., formerly a wholly-owned subsidiary of Osisko Development; (iii)

all of the issued and outstanding partnership units in General Partnership Osisko Baie James formerly held

by Osisko Development; and (iv) all of O3 Mining's rights, title and interest in and to the Éléonore Opinaca

property, together with any claims, permits, leases, or other forms of tenure substituted, renewed or

amended for such interests, and all contractual rights currently held or acquired for the benefit of such

property (collectively, the "Transferred Assets").

Financing

Subsequent to the Transfer, Electric Elements completed an equity financing of 8,217,405 EEM Shares at

a price of C$0.50 per EEM Share for aggregate gross proceeds to Electric Elements of C$4,108,702.50

(the "Financing"). Proceeds of the Financing will be used by Electric Elements to fund the first phase of

exploration activities on its newly-acquired James Bay properties and for general corporate purposes.

After giving effect to the Financing, Osisko D evelopment and O3 Mining hold approximately 47%

and 12%, respectively, of the outstanding E EM Shares, with the remaining approximately 41% of

the outstanding EEM Shares held by the subscribers participating in the Financing.

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Completion of the Spin-out Transaction allows Osisko Development and O3 Mining to continue to focus on

their respective primary businesses of developing their respective material gold properties, while continuing

to have exposure to the Transferred Assets through their respective ownership interests in Electri c

Elements.

The Financing was completed in reliance on exemptions from the prospectus requirement under National

Instrument 45-106 – Prospectus Exemptions, and the EEM Shares sold thereunder are subject to resale

restrictions under Canadian securities laws ending four months and one day after the date that E lectric

Elements becomes a reporting issuer in any province or territory of Canada.

Certain insiders of Osisko Development participated in the Financing for an aggregate of 1,400,000 EEM

Shares for total consideration of C$700,000. Each subscription by an insider may be considered to be a

"related party transaction" for purposes of Multilateral Instrument 61 -101 – Protection of Minority Security

Holders in Special Transactions ("MI 61-101") as the Financing may be a transaction whereby Osisko

Development is deemed to sell, transfer or dispose of an asset to "related parties" (within the me aning of

MI 61-101). The subscriptions by such related parties are exempt from the formal valuation and minority

shareholder requirements under MI 61-101 in reliance upon the exemptions contained in section 5.5(a) and

5.7(1)(a), respectively, of MI 61 -101 as the fair market value of the transaction, insofar as it invo lves

interested parties, is not more than the 25% of Osisko Development's market capitalization.

About Osisko Development Corp.

Osisko Development Corp. is a premier North American gold development company focused on high-

quality past-producing properties located in mining friendly jurisdictions with district scale potential. The

Company's objective is to become an intermediate gold producer by advancing its 100% -owned Cariboo

Gold Project, located in central B.C., Canada, the Tintic Project in the historic East Tintic mining district in

Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico. In addition to considerable brownfield

exploration potential of these properties, that benefit from significant histori cal mining data, existing

infrastructure and access to skilled labour, the Company's project pipeline is complemented by other

prospective exploration properties. The Company's strategy is to develop attractive, long -life, socially and

environmentally sustainable mining assets, while minimizing exposure to development risk and growing

mineral resources.

For further information about Osisko Development Corp, please contact:

Sean Roosen | Chair & CEO

Telephone: (514) 940-0685

Email: [email protected]

Philip Rabenok | Investor Relations

Telephone: (437) 423-3644

Email: [email protected]

About O3 Mining Inc.

O3 Mining Inc. is a gold explorer and mine developer on the road to produce f rom its highly prospective

gold camps in Québec, Canada. O3 Mining benefits from the support and expertise of a team of industry

leaders as it grows towards being a gold producer with several multi-million-ounce deposits in Québec.

O3 Mining is well -capitalized and owns a 100% interest in all its properties (62,000 hectares) in Québec.

O3 Mining trades on the TSX Venture Exchange (TSXV: OIII) and OTC Markets (OTCQX: OIIIF). The

Corporation is focused on delivering superior returns to its shareholder s and long -term benefits to its

stakeholders. Further information can be found on O3 Mining's website at https://o3mining.com

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For further information about O3 Mining Inc., please contact:

José Vizquerra | CEO, President & Director

Email: [email protected]

Alex Rodriguez | Vice President, Corporate Development

Email: [email protected]

Telephone: (647) 391-7724

CAUTION REGARDING FORWARD LOOKING STATEMENTS

This news release contains "forward ‐looking information" (within the meaning of applicable Canadian

securities laws) and "forward ‐ looking statements" (within the meaning of the U.S. Private Securities

Litigation Reform Act of 1995). Such statements or information are identified with words such as

"anticipate", "believe", "expect", "plan", "intend", "potential", "estimate", "propose" , "project", "outlook",

"foresee" or similar words suggesting future outcomes or statements regarding any potential outcome. Such

statements in this news release may include, without limitation, statements pertaining to: references to the

lithium potential of the James Bay and Élé onore Opinaca properties , the use of proceeds from the

Financing, and the ability of Electric Elements to carry out its first phase of exploration activities . Such

forward-looking information or statements are based on a number of risks, uncertainties and assumptions

which may cause actual results or other expectations to differ materially from those anti cipated and which

may prove to be incorrect. Actual results could differ materially due to a number of factors, including, without

limitation, satisfy ing the requirements of the TSX Venture Exchange (if at all). Although the Company

believes that the expectations reflected in the forward ‐looking information or statements are reasonable,

prospective investors in the Company securities should not place undue reliance on forward -looking

statements because the Company can provide no assurance that such expectations will prove to be correct.

Forward‐looking information and statements contained in this news release are as of the date of this news

release and the Company assumes no obligation to update or revise this forward -looking information and

statements except as required by law.

Neither 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. No stock exchange, securities commission or other r egulatory authority has approved or

disapproved the information contained herein.