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Osisko Development Announces Upsize of "Bought Deal" Private Placement to $90 Million

Financings

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

OSISKO DEVELOPMENT ANNOUNCES UPSIZE OF

"BOUGHT DEAL" PRIVATE PLACEMENT TO $90 MILLION

Montréal, February 9, 2022 – Osisko Development Corp. (" Osisko Development " or the

"Company") (TSXV: ODV) is pleased to announce, further to its previously-announced "bought deal"

private placement, that it has entered into an amended letter of engagement with Eight Capital, under

which Eight Capital, acting as co-lead underwriter and joint bookrunner with BMO Nesbitt Burns Inc.

and National Bank Financial Inc., and on behalf of a syndicate of underwriters including Canaccord

Genuity Corp., RBC Capital Markets, PI Financial Corp. and Desjardins Securities Inc. (collectively,

the "Underwriters"), has now agreed to purchase, on a "bought deal" private placement basis, an

aggregate of 20,225,000 subscription receipts of the Company (the "Subscription Receipts") and/or

units of the Company (the "Units" and, together with the Subscription Receipts, the " Offered

Securities") at a price of $4.45 per Offered Security (the "Issue Price"), for aggregate gross proceeds

of $90,001,250 (the "Offering").

Each Unit will be 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 $7.60 per Common Share for a period

of 60 months following the closing date of the Offering.

Each Subscription Receipt will entitle the holder thereof to receive, upon the satisfaction of the Escrow

Release Condition (as defined below), and without payment of additional consideration, one Unit.

The Company has granted the Underwriters an option, exercisable in whole or in part up to 48 hours

prior to the closing of the Offering, to purchase up to an additional aggregate amount of 3,033,750

Subscription Receipts and/or Units at the Issue Price, for additional gross proceeds of up to

$13,500,187.50.

The gross proceeds from the sale of the Subscription Receipts , net of expenses of the Underwriters

and 50% of the commissions payable to the Underwriters in respect of the Subscription Receipts, will

be placed into escrow and will be released immediately prior to the completion of the Company's

proposed acquisition of Tintic Consolidated Metals LLC (" Tintic"), as described in the press release

of the Company dated January 25, 2022 (the " Tintic Acquisition ") (the "Escrow Release

Condition"). If the Escrow Release Condition is not satisfied prior to the date that is 90 days from the

closing of the Offering, the escrowed proceeds of the Offering will be returned to the holders of the

Subscription Receipts.

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

Company's mineral assets, including the Cariboo Gold Project, the San Antonio Gold Project and

properties held by Tintic assuming the completion of the Tintic Acquisition, and for general corporate

purposes.

The closing date of the Offering is expected to occur on or about March 2, 2022, and is subject to

certain conditions including, but not limited to, the receipt of all necessary approvals, including the

conditional approval from the TSX Venture Exchange. The securities issued pursuant to the Offering

will be subject to applicable hold periods, including the typical four month hold period from the date of

closing of the Offering.

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

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.

About Osisko Development Corp.

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

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 flags hip 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 and early exploration stage properties including the Coulon

Project and James Bay Properties located in Québec, Canada as well as the Guerrero Properties

located in Guerrero, 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 th is 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",

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"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. Informati on contained in forward ‐looking statements, including with respect to the

expected size of the Offering, the use of proceeds of the Offering, the jurisdictions in which the Offered

Securities will be offered or sold, the number of Offered Securities offered or sold, the ability of Osisko

Development to close the Offering on terms announced (if at all), the timing and ability of Osisko

Development to satisfy the customary listing conditions of the TSX Venture Exchange (if at all), the

timing and abili ty of Osisko Development to complete the Tintic Acquisition and satisfy the Escrow

Release Condition (if at all), the timing and ability of Osisko Development to obtain all necessary

approvals in respect of the Offering and the Tintic Acquisition, future p roduction of mines, is based

upon certain material assumptions that were applied in drawing a conclusion or making a forecast or

projection, including management's perceptions of historical trends, current conditions and expected

future developments, publi c disclosure from operators of the relevant mines, as well as other

considerations 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: (i) the news release announcing the Tintic Acquisition dated

January 25, 2022; and (ii) 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.