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Osisko Development Closes Final Tranche of Non-Brokered Private Placement of Subscription Receipts

Financings

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

OSISKO DEVELOPMENT CLOSES FINAL TRANCHE OF NON-BROKERED

PRIVATE PLACEMENT OF SUBSCRIPTION RECEIPTS

Montréal, April 21, 2022 – Osisko Development Corp. (" Osisko Development " or the " Company")

(TSXV: ODV) is pleased to announce the successful closing of the final tranche of its previously-

announced non-brokered private placemen t, pursuant to which an additional 512,980 subscription

receipts of the Company (the " Subscription Receipts ") were issued at a price of US$3.50 per

Subscription Receipt, for additional gross proceeds of approximately US$1.795 million. The final tranche

of the private placement was for the purpose of accommodating subscribers with pending subscriptions

at the time of the closing of the initial tranches.

The total size of the non-brokered private place ment offering is approximately US$119.3 million,

comprising:

• Tranche 1: US$84.8 million; closed on March 4, 2022

• Tranche 2: US$32.8 million; closed on March 29, 2022

• Tranche 3: US$1.795 million; closed on April 21, 2022

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

upon the satisfaction of the Escrow Release Condi tion (as defined below), and without payment of

additional consideration. Each Unit is compris ed 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 listing of the Common Shares on the

New York Stock Exchange (the " Escrow Release Condition"), 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 Condition is satisfied on or

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

Company. If the Escrow Release Condition is not satisfied on or prior to the Escrow Release Deadline or

the Company publicly announces that (a) it does not intend to sa tisfy the Escrow Release Condition, or

(b) the Escrow Release Condition is incapable of bei ng 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 t he offering to advance the development of the

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

are subject to a hold period expiring four months and one day from the date of issue pursuant to applicable

Canadian securities laws. The offering remains 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 jurisdic tion. 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

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registration under the U.S. Securities Act of 1 933, 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 uni quely 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 flagshi p 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 cost s of US$19 per ounce. The Cariboo Gold Project is

advancing through permitting as a 4, 750 tonnes per day und erground 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 "forwardlooking statements" within

the meaning of applicable Canadian securities laws. These forwardlooking 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 forwardlooking statements. Forwardlooking statements are not guarantees of performance.

Words such as "may", "will", "would", "could", "expect", "believe", "plan", "anticipate", "intend", "estimate",

"continue", or the negative or compar able terminology, as well as terms usually used in the future and

the conditional, are intended to identify forwardlook ing 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 t he 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 (if at

all), the timing and ability of Osisko Development to obtain all necessary approvals in respect of the listing

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of the Common Shares on the NYSE and the future production of mines, is based upon certain material

assumptions that were applied in drawing a conclusion or making a fo recast or projection, including

management's perceptions of hist orical trends, current conditions and expected future developments,

public 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 Deve lopment, may ultimately prove to be

incorrect since they are subject to risks and uncert ainties 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, 20 20, both of which are availabl e electronically under Osisko

Development's issuer profile on SEDAR (www.sedar.c om). The forwardlooking statements set forth

herein concerning Osisko Developmen t reflect management's expectations as at t he date of this news

release and are subject to change a fter such date. Osisko Developm ent disclaims any intention or

obligation to update or revise any forward-looking stat ements, whether as a resu lt of new information,

future events or otherwise, other than as required by law.

Neither the TSX Venture Exchange nor its Regulati on 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.