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Osisko Development Announces Amendments to Its Employee Share Purchase Plan

Financings

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OSISKO DEVELOPMENT ANNOUNCES AMENDMENTS TO ITS

EMPLOYEE SHARE PURCHASE PLAN

MONTREAL, December 21, 2021 – Osisko Development Corp. (“Osisko Development” or the

“Company”) (TSX.V -ODV) announces that the directors of the Company have approved

amendments to the Company’s employee share purchase plan (the “Plan”) in order to accelerate

the vesting provisions of the shares granted thereunder, subject to a holding period, and to clarify

existing provisions of the Plan, without altering the scope, nature and intent of such provisions

(the “Amendments”).

In accordance with the provisions of the Plan and the policies of the TSX Venture Exchange

(“TSXV”), the Amendments are not subject to shareholders approval but remain subject to the

final approval of the TSXV.

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

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

of 21.69 Mt at 3.9 Au g/t for a total of 2.7 million ounces of gold (see NI 43-101 Technical Report

and mineral resource estimate effective October 5th, 2020). 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 as well as the Guerrero

Properties located in Mexico. Osisko Development began trading on the TSX Venture Exchange

under the symbol “ODV” on December 2, 2020 and the Company’s 14,789,373 outstanding share

purchase warrants were listed on the TSX Venture Exchange under the symbol “ODV.WT” on

October 25, 2021.

For further information, please contact Osisko Development Corp.:

Jean Francois Lemonde

VP Investor Relations

[email protected]

Tel: 514-299-4926

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Forward-looking Statements

Certain statements contained in this press release may be deemed “forward‐looking statements”

within the meaning of applicable Canadian and U.S. 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 statements. Forward‐

looking statements are not guarantees of perform ance. 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 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, 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 it s business. 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.