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OSISKO DEVELOPMENT ANNOUNCES OVERSUBSCRIBED AND FULLY ALLOCATED PRIVATE PLACEMENT OF UNITS US$57.5 Million Brokered Private Placement (Including Exercise In Full of Option) Expected

Financings Mergers & Acquisitions

NYSE | TSXV: ODV NEWS RELEASE

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

OSISKO DEVELOPMENT ANNOUNCES OVERSUBSCRIBED AND FULLY ALLOCATED

PRIVATE PLACEMENT OF UNITS

US$57.5 Million Brokered Private Placement (Including Exercise In Full of Option) Expected

to close November 12, 2024

Montreal, Québec, October 24, 2024 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the " Company") is pleased to announce its private placement offering

("Offering") of units of the Company ("Units"), announced on October 23, 2024, was oversubscribed

and has been fully allocated. This Offering is expected to close on or about November 12, 2024, pursuant

to which an aggregate of 31,944,700 Units are expected to be issued at a price of US$1.80 per Unit for

gross proceeds of US$57,500,460 (including the exercise in full of the agents' option).

Sean Roosen, Chair and CEO of Osisko Development, commented:

"This Offering, together with recent financings, strengthens Osisko Development's balance sheet

and provides the resources necessary to repay a meaningful portion of our existing credit facility

with National Bank – avoiding certain ongoing fees – and fund key upcoming milestones at the

Cariboo Gold Project, including the final stages of its permitting process, an updated feasibility

study, and the ongoing bulk sample work. It will also accelerate pre-construction activities at

Cariboo."

The Offering is subject to certain conditions including, but not limited to, the receipt of all necessary

approvals, including the conditional approval from the New York Stock Exchange and the TSX Venture

Exchange. All securities issued under the Offering will be subject to a hold period expiring four months

and one day from the Closing Date.

The securities have not been registered under the United States Securities Act of 1933, as amended

(the "U.S. Securities Act"), or any U.S. state securities laws, and may not be offered or sold to, or for

the account or benefit of, persons in the "United States" or "U.S. persons" (as such terms are defined

in Regulation S under the U.S. Securities Act) absent registration under the U.S. Securities Act and all

applicable U.S. state securities laws or compliance with an exemption from such registration

requirements. This news release is not an offer to sell or the solicitation of an offer to buy the securities

in any jurisdiction in w hich such offer, solicitation or sale would be unlawful prior to qualification or

registration under the securities laws of such jurisdiction.

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ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. is a North American gold development company focused on past- producing

mining camps 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 prop erties, that benefit from significant historical 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, visit our website at www.osiskodev.com or contact:

Sean Roosen Philip Rabenok

Chairman and CEO Director, Investor Relations

Email: [email protected] Email: [email protected]

Tel: +1 (514) 940-0685 Tel: +1 (437) 423-3644

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: the size of the Offering, the use of the net proceeds

from the Offering, the closing of the Offering and the ability to obtain the necessary regulatory authority approvals. Such f orward-

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 anticipated and which may prove to be incorrect. Actual results could diff er

materially due to a number of factors, including, without limitation, satisfying the conditions of closing for the Offering, including the

requirements of the New York Stock Exchange and 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 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 news release. No stock exchange,

securities commission or other regulatory authority has approved or disapproved the information contained herein.