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Osisko Development Closes First Tranche of Previously-Announced Non-Brokered Private Placement FOR Gross Proceeds of US$84.8 Million

Financings

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

OSISKO DEVELOPMENT CLOSES FIRST TRANCHE OF PREVIOUSLY-ANNOUNCED

NON-BROKERED PRIVATE PLACEMENT FOR GROSS PROCEEDS OF US$84.8 MILLION

Montréal, March 4, 2022 – Osisko Development Corp. ("Osisko Development" or the "Company")

(TSXV: ODV) is pleased to announce the successful closing of the first tranche of the Company's

previously-announced non-brokered privat e placement , pursuant to which a total of 24,215,099

subscription receipts of the Company (the "Subscription Receipts ") were issued at a price of

US$3.50 per Subscription Receipt , for gross proceeds of approximately US$84.8 million (the

"Offering"). The Company anticipates closing a second tranche of the Offering in late March 2022 ,

pursuant to which an additional up to US$ 25.5 million of Subscription Receipts may be issued to

accommodate additional interest for the Subscription Receipts.

Each Subscription Receipt entitles the holder thereof to receive one unit of the Company (each, a

"Unit"), upon the satisfaction of the Escrow Relea se Conditions (as defined below), and without

payment of additional consideration. Each Unit is comprised of one common share of the Company

(each, a "Common Share") and one common share purchase warrant (each, a "Warrant"), with each

Warrant entitling the holder thereof to purchase one additional Common Share at a price of US$6.00

per Common Share for a period of five years following the date of issue.

The gross proceeds from the sale of the Subscription Receipts will be held by TSX Trust Company,

as subscription receipt agent, and released to the Company upon the satisfaction of certain escrow

release conditions, including the completion of the listing of the Common Shares on the New York

Stock Exchange (the "Escrow Release Conditions"), which is contingent upon the Company meeting

the listing requirements of the New York Stock Exchange (" NYSE") and may involve, among other

things, a consolidation of the Common Shares. If the Escrow Release Conditions are satisfied on or

before June 15, 2022 (the "Escrow Release Deadline"), the escrowed funds will be released to the

Company. If the Escrow Release Conditions are not satisfied on or prior to the Escrow Release

Deadline or the Company publicly announces that (a) it does not intend to satisfy the Escrow Release

Conditions, or (b) the Escrow Release Conditions are incapable of being satisfied by the Escrow

Release Deadline, the escrowed proceeds, together with interest earned thereon, will be returned on

a pro rata basis to the holders of the Subscription Receipts, and the Subscription Receipts will be

cancelled and have no further force and effect.

The Company intends to use the net proceeds of the Offering to advance the development of the

Company's mineral assets and for general corporate purposes. All securities issued under the Offering

will be subject to a hold period expiring four months and one day from the date hereof. The Offering is

subject to final acceptance of the TSX Venture Exchange.

This news release does not constitute an offer to sell or a solicitation of an offer to buy any

securities in the United States or any other jurisdiction. No securities may be offered or sold

in the United States or in any other jurisdiction in which such offer or sale would be unlawful

absent registration under the U.S. Securities Act of 1933 , as amended, or an exemption

therefrom or qualification under the securities laws of such other jurisdiction or an exemption

therefrom.

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About Osisko Development Corp.

Osisko Development Corp. is uniquely positioned as a premier gold development company in North

America to advance the Cariboo Gold Project and other Canadian and Mexican properties, with the

objective of becoming the next mid- tier gold producer. The Cariboo Gold Project, located in central

British Columbia, Canada, is Osisko Development's flagship asset with measured and indicated

resource of 21.44 million tonnes at 4.6 g/t Au for a total of 3.2 million ounces of gold and inferred

resource of 21.69 million tonnes at 3.9 g/t Au for a total of 2.7 million ounces of gold. The considerable

exploration potential at depth and along strike distinguishes the Cariboo Gold Project relative to other

development assets as does the historically low, all-in discovery costs of US$19 per ounce. The

Cariboo Gold Project is advancing through permitting as a 4,750 tonnes per day underground

operation with a feasibility study on track for completion in the first half of 2022. Osisko Development's

project pipeline is complemented by potential near-term production targeted from the San Antonio

Gold Project, located in Sonora, Mexico.

For further information about Osisko Development Corp., please contact:

Sean Roosen, CEO

Telephone: (514) 940-0685

Email: [email protected]

Jean Francois Lemonde, VP Investor Relations

Telephone: (514) 299-4926

Email: [email protected]

Follow us on our Social Media Platforms:

Facebook:

https://www.facebook.com/osiskodev

Linked In:

http://www.linkedin.com/company/osisko-dev

Youtube:

https://www.youtube.com/channel/UC-1LPPhZ9WZnOuWsf6mRWhw

Twitter:

https://twitter.com/OsiskoDev

Cautionary Note Regarding Forward-looking Information

Certain statements contained in this news release may be deemed "forward‐looking statements "

within the meaning of applicable Canadian securities laws. These forward ‐looking statements, by

their nature, require Osisko Development to make certain assumptions and necessarily involve known

and unknown risks and uncertainties that could cause actual results to differ materially from those

expressed or implied in these forward ‐looking st atements. Forward‐ looking statements are not

guarantees of performance. Words such as "may", "will", "would", "could", "expect", "believe", "plan",

"anticipate", "intend", "estimate", "continue", or the negative or comparable terminology, as well as

terms usually used in the future and the conditional, are intended to identify forward ‐looking

statements. Information contained in forward‐looking statements, including with respect to the use of

proceeds of the Offering, the timing and ability of Osisko Development to satisfy the customary listing

conditions of, and receive final acceptance of the Offering from, the TSX Venture Exchange (if at all),

the timing and ability of Osisko Development to complete the listing of the Common Shares on the

NYSE and satisfy the Escrow Release Condition s (if at all) , the timing and ability of Osisko

Development to obtain all necessary approvals in respect of the listing of the Common Shares on the

NYSE and the future production of mines, is based upon certain material assumptions that were

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applied in drawing a conclusion or making a forecast or projection, including management's

perceptions of historical trends, current conditions and expected future developments, public

disclosure from operators of the relevant mines, as well as other consi derations that are believed to

be appropriate in the circumstances. Osisko Development considers its assumptions to be reasonable

based on information currently available, but cautions the reader that their assumptions regarding

future events, many of which are beyond the control of Osisko Development, may ultimately prove to

be incorrect since they are subject to risks and uncertainties that affect Osisko Development, and its

business. For additional information with respect to these and other factors and assumptions

underlying the forward- looking statements made in this news release concerning Osisko

Development, see the filing statement dated November 20, 2020, both of which are available

electronically under Osisko Development's issuer profile on SEDAR (www.sedar.com). The forward‐

looking statements set forth herein concerning Osisko Development reflect management's

expectations as at the date of this news release and are subject to change after such date. Osisko

Development disclaims any intention or obligation to update or revise any forward-looking statements,

whether as a result of new information, future events or otherwise, other than 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.