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Osisko Development Signs Agreement with Williams Lake First Nation FOR the Cariboo GOLD Project

Corporate Updates

OSISKO DEVELOPMENT SIGNS AGREEMENT WITH WILLIAMS LAKE FIRST

NATION FOR THE CARIBOO GOLD PROJECT

MONTREAL, July 5, 2022 – Osisko Development Corp. (“Osisko Development” or the “Company”) (ODV

TSX.V & NYSE) is pleased to announce Williams Lake First Nation (“WLFN”) and Barkerville Gold Mines

Ltd. (“BGM”), the Company’s 100% owned subsidiary, have entered into a participation agreement (“The

Agreement”) relating to the development of the Cariboo Gold Project (“ The Project”), located within the

traditional territory of the WLFN.

The Agreement represents an important milestone in our relationship and supports our mutual vision to

develop a socially and environmentally sustainable Project.

The Agreement will strengthen our long- term relationship through a framework for working together

predictably, collaboratively, and respectfully on ongoing development matters while providing opportunities

for current and future generations of the WLFN to participate meaningfully in the be nefits of the Project.

Osisko Development would like to thank WLFN, BGM and our respective negotiating teams for their efforts

and commitment in realizing this Agreement.

Specific terms of the Project Agreement remain confidential; however, it puts in place a thorough and

comprehensive process for the Project to be developed and operated with the consent and support of the

WLFN.

WLFN Chief, Willie Sellars reflected on the growth of the relationship, “The Company has been proactive

in supporting a robust engagement process with WLFN that respects our commitment to sustainable mining

activity in our traditional territory, particularly the QR Mill Site near Likely, BC, a key processing location

envisioned by the Project. The Agreement provides WLFN with a seat at the table and the enhanced

opportunity to advance the principles of economic reconciliation, environmental stewardship, and additional

employment opportunities for WLFN members.”

Vice President of Sustainable Development, Chris Pharness comments, “Good relationships are key to any

successful endeavor. Osisko Development’s belief is that through the foundation of respect, transparency,

and reciprocity our relationships will provide long- term, transformative outcomes for our friends, partners,

and ourselves. The spirit of our negotiation and the signing of this agreement speaks to our desire to

develop opportunities through the collective sharing of culture and worldview with the WLFN community,

elders, and leadership.”

About Osisko Development Corp.

Osisko Development is uniquely positioned as a premier gold development company in North America to

advance the Cariboo Gold Project and other Canadian, U.S.A. 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. The considerable exploration potential at depth and along

strike distinguishes the Cariboo Gold Project relative to other development assets. Osisko Development's

project pipeline is complemented by its interest in the San Antonio gold project, located in Sonora, Mexico

and the Trixie gold test mine, located in Utah, U.S.A.

For further information, please contact Osisko Development Corp.:

Jean Francois Lemonde

VP Investor Relations

[email protected]

Tel: 514-299-4926

For further information, please contact Williams Lake First Nation:

Kirk Dressler

Director of Legal and Corporate Services

Williams Lake First Nation

2561 Quigli Drive

Williams Lake, BC

V2G 0B1

Tel: 778-417-0193

Forward-looking Statements

Certain statements contained in this press release may be deemed “forward-looking statements” within the

meaning of the United States Private Securities Litigation Reform Act of 1995 and “forward- looking

information” within the meaning of applicable Canadian securities legislation. 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 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 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, and any other information herein that is not a historical

fact may be “forward looking information”. Material assumptions also include, 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

its business. Such risks and uncertainties include, among others, risks relating to capital market conditions,

regulatory framework, the ability of exploration activities (including drill results) to accurately predict

mineralization; errors in management’s geological modelling; the ability of to complete further exploration

activities, including drilling; property and stream interests in the Project; the ability of the Company to obtain

required approvals; the results of exploration activities; risks relating to exploration, development and

mining activities; the global economic climate; metal prices; dilution; environmental risks; and community

and non-governmental actions and the responses of relevant governments to the COVID -19 outbreak and

the effectiveness of such responses. Readers are urged to consult the disclosure provided under the

heading "Risk Factors" in the Company’s annual information form for the year ended December 31, 2021,

as amended, which has been filed on SEDAR (www.sedar.com) under the Company's issuer profile and

on the U.S. Securities Exchange Commission’s EDGAR website (www.sec.gov), for further information

regarding the risks and other factors applicable to the exploration results. Although the Company’s believes

the expectations conveyed by the Forward- looking Statements are reasonable based on information

available at the date of preparation, no assurances can be given as to future results, levels of activity and

achievements. The Company disclaims any obligation to update any Forward-looking Statements, whether

as a result of new information, future events or results or otherwise, except as required by law. There can

be no assurance that these Forward- looking Statements will prove to be accurate, as actual results and

future events could differ materially from those anticipated in such statements. Accordingly, readers should

not place undue reliance on Forward-looking Statements.

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.