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Osisko Development Receives BC Mines Act Permits FOR Cariboo GOLD Project; Environmental Management Act Permits Referred

Permits & Approvals

NYSE | TSXV: ODV NEWS RELEASE

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OSISKO DEVELOPMENT RECEIVES BC MINES ACT PERMITS FOR CARIBOO GOLD

PROJECT; ENVIRONMENTAL MANAGEMENT ACT PERMITS REFERRED

Montreal, Québec, November 20, 2024 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the "Company") is pleased to announce the approval of the BC Mines Act

permits for its 100%-owned Cariboo Gold Project ("Cariboo" or the "Project") located in central British

Columbia ("BC"), Canada. The approval of these permits marks an important milestone in enabling the

Company to move forward with the construction and operation of the underground Cariboo Gold Project.

"Receipt of the construction and operating permits for the Cariboo Gold Project is a major milestone and

monumental achievement for Osisko Development and its stakeholders. It is the culmination of almost

five years of extensive discussion and consultation with provincial regulators, Indigenous nations and

host communities in ensuring the Project becomes a model for responsible mine development and

environmental stewardship that redefines mining for a better future ," commented Sean Roosen,

Founder, Chairman and CEO.

"As permitting complexity and timelines increase globally, BC's new environmental assessment and

permitting framework demonstrates the province's commitment to sustainable mine development

relying on a robust consultation process, on predictable, legislated timelines, alongside a clear set of

information requirements . We commend all those involved in ensuring the Cariboo Gold Project is

successful in navigating this new rigorous review process and in securing key permits for construction

and operation."

Lhtako Dené Nation Chief Clifford Lebrun remarked , "The Cariboo Gold Project represents a

significant opportunity for Lhtako Dené Nation and we are pleased that it has received its BC Mines Act

Permits. The Mine and its surrounding infrastructure is firmly located in our core traditional territory,

and we have been active participants at every stage of the project from mineral exploration to the

Environmental Assessment and the BC Mines Act Permit. We look forward to a sustainable and growing

relationship with Osisko Development as the project proceeds through to operation."

Honourable Jagrup Brar, British Columbia’s Minister of Mining and Critical Minerals , noted,

"My congratulations to Osisko Development Corporation for your hard work and collaboration with

partners and local communities in reaching this important milestone and obtaining a permit for the

Cariboo Gold mine. The first project wholly assessed under the new 2018 Environmental Assessment

Act, Cariboo Gold is crucial for BC, creating good jobs and opening up long-term opportunities for local

businesses, communities, and First Nations, all while adhering to top-tier environmental protection."

With the key Project construction and operating permits secured, and the remaining Environmental

Management Act permits referred to the Statutory Decision Maker of the Ministry of Energy and Climate

Solutions – with a decision expected shortly – the Company is advancing discussions, which are active

and ongoing, on various funding options, including a comprehensive financing package.

Progress continues on the ongoing bulk sample and underground development in the Lowhee Zone

alongside the optimized feasibility study work, which are slated to be completed in Q1 2025 and Q2

2025, respectively. Additionally, work advances on other pre-construction activities, including on certain

detailed engineering and project execution work. Execution on these milestones will play a crucial role

in ongoing financing discussions.

A formal positive final investment decision and the engagement on a project financing package in the

coming months would allow for f ull-scale construction to commence in the second half of 2025 with a

targeted completion date at the end of 2027.

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DEVELOPING A GENERATIONAL DISTRICT IN THE CARIBOO REGION

The Cariboo Gold Project is estimated to operate over an initial 12 -year mine life, based on the 2023

Cariboo FS (as defined herein), not including any potential future mine life extensions from resource

conversion or further exploration success. Key highlights of the Project include:

• Gold production of up to 223 thousand ounces (" koz") per annum during peak operations and

averaging 194 koz of gold per annum during Phase 2 at 4,900 tonnes per day;

o Work is advancing on an optimized feasibility study which is expected to be completed

in Q2 2025 (see Optimized Feasibility Study);

• Direct employment of approximately 634 workers during the project construction period and up

to 488 employees during peak steady-state operations, creating safe and empowering

employment for the community;

• Beyond direct job creation, the Project's activities are anticipated to contribute to significant

economic development including the creation of ancillary job opportunities among suppliers ,

various sub -contractors and other groups within the local communities and broader Cariboo

region;

• Over the initial 12 -year mine life, the Company anticipates investing C$588.4 million in initial

and expansion capital costs and C$466. 6 million in sustaining capital costs, with the

overwhelming majority to be spent locally and in the province of BC;

• Access to the predominantly green hydroelectric BC power grid provides unparalleled

opportunities to minimize the Project's carbon footprint by deploying a largely electric equipment

fleet, while benefitting from favourable energy pricing at 6.6¢ per kWh (CAD$);

• Low impact mining from deploying ore sorter and roadheader technologies that significantly

reduce the carbon footprint by generating fewer waste rock at lower energy intensity relative to

other traditional mining operations;

• Significant exploration upside at depth with the current Mineral Reserves and Resources only

defined over an average depth of 350 meters from surface, while considerable potential also

exists on the broader Cariboo property across a combined 83 km mineralized trend.

CARIBOO GOLD PROJECT PERMITS

Following a robust and rigorous review process by a dedicated Mine Review Committee, set up by the

Major Mines Office, the Company received or referred the following permits for the Cariboo Gold Project:

• M-247 – Mines Act permit for the Mine Site Complex and Bonanza Ledge (received);

• M-198 – Mines Act permit for the QR Mill (received);

• PE-111511 - Environmental Management Act Permit for the Mine Site Complex (referred);

• PE-12601 - Environmental Management Act Permit for QR Mill (referred); and

• PE-17876 - Environmental Management Act Permit for Bonanza Ledge (referred).

The Mines Act permits grant the Company the ability to proceed with the construction, operation and

reclamation activities on each of the site boundaries, as outlined within the scope of the Project . The

Environmental Management Act permits pertain to any Project -related discharge activities to the

environment, including water and air, and the framework and limitations thereof, within the area s

outside of the immediate mine site boundaries.

Work is ongoing with the Ministry of Water, Land and Resource Stewardship and the Ministry of Forests,

which is tracking well, on obtaining all necessary approvals for the construction of the transmission line.

INDIGENOUS NATIONS

The Company is committed to advancing collaborative partnerships with Indigenous nations related to

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the Project as evidenced by years of extensive consultation and the signing and ongoing implementation

of the participation agreements with each of the Lhtako Dené Nation in 2020 and the Williams Lake First

Nation in 2022. The Company is working towards an agreement with the Xatśūll First Nation, with whom

it continues to engage and consult. This includes good faith and reasonable offers for financial and other

benefits along substantially similar frameworks as those agreed to by Lhtako Dené Nation and Williams

Lake First Nation.

The Company is dedicated to developing a modern, safe and sustainable operation at the Cariboo Gold

Project, and remains committed to engaging in constructive dialogue to ensure all Indigenous nations

and stakeholders benefit from the development of the Project, whilst ensuring it remains viable.

OPTIMIZED FEASIBILITY STUDY

The Company is advancing work on an optimized feasibility study ("OFS") for the Cariboo Gold Project,

which is anticipated to be completed in Q2 2025. The scope of the OFS will take into account and include,

among other things, certain mining and processing flowsheet optimizations including improvements to

the flotation circuit, an accelerated development timeline directly to 4,900 tonnes per day throughput,

updated metal price and foreign exchange assumptions , and updated operating and capital cost

estimates to reflect the current environment. The OFS work follows the framework set out in the existing

ongoing permitting process.

BULK SAMPLE AND UNDERGROUND DEVELOPMENT UPDATE

In Q1 2024, under an existing provincial permit, the Company commenced an underground development

drift from the existing Cow Portal into the Cariboo Gold Project's mineral deposit at the Lowhee Zone.

The objective of the bulk sample work program is to develop into the ore body and extract a 10,000

tonne bulk sample of mineralized material for mining, ore sorting and processing testing.

• For the development of the underground drift the Company has been utilizing a combination of

continuous mining using a fully-electric Sandvik roadheader , which has been performing

favorably, and traditional drilling and blasting.

• To date, approximately 1, 083 meters of development has been completed or approximately

92%, with another 89 meters remaining to reach the target area.

• The Company anticipates completing the bulk sample program and release the results thereof

in Q1 2025.

Figure 1: Bulk sample location and ramp progress (November 17, 2024).

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Figure 2: Main decline ramp overall view (left) and development of Lowhee top sill

access for stope extraction (right).

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Figure 3: Visible sulfide mineralization within the bulk sample stope area development.

Qualified Persons

The scientific and technical information contained in this news release has been reviewed and approved

by Daniel Downton, P.Geo., Chief Resource Geologist of Osisko Development, a "qualified person" within

the meaning of National Instrument 43 -101 – Standards of Disclosure for Mineral Projects ("NI 43-

101").

Technical Reports

Information relating to the Cariboo Gold Project and the current feasibility on the Cariboo Gold Project

and the assumptions, qualifications and limitations thereof is supported by the technical report titled

"Feasibility Study for the Cariboo Gold Project, District of Well, British Columbia, Canada", dated January

10, 2023 (amended January 12, 2023) with an effective date of December 30, 2022 prepared for the

Company by independent representatives BBA Engineering Ltd. and supported by independent

consulting firms, including InnovExplo Inc., SRK Cons ulting (Canada) Inc., Golder Associates Ltd.

(amalgamated with WSP Canada Inc. on January 1, 2023, to form WSP Canada Inc.), WSP USA Inc.,

Falkirk Environmental Consultants Ltd., Klohn Crippen Berger Ltd., KCC Geoconsulting Inc., and JDS

Energy & Mining Inc. (the " 2023 Cariboo FS"). Reference should be made to the full text of the Cariboo

Technical Report, which was prepared in accordance with NI 43 -101 and is available electronically on

SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov) under Osisko Development's issuer profile

and on the Company's website at www.osiskodev.com.

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ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. is a North American gold development company focused on past -producing

mining camps located in mining friendly jurisdictions with district scale potential. The Company 's

objective is to become an intermediate gold producer by advancing its 100% -owned Cariboo Gold

Project, located in central B .C., Canada, the Tintic Project in the historic East Tintic mining district in

Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico. In addition to considerable brownfield

exploration potential of these properties, that benefit from significant historical mining data, existing

infrastructure and access to skilled labour, the Company 's project pipeline is complemented by other

prospective exploration properties. The Company 's strategy is to develop attractive, long -life, socially

and environmentally sustainable mining assets, while minimizing exposure to development risk and

growing mineral resources.

For further information, visit our website at www.osiskodev.com or contact:

Sean Roosen Philip Rabenok

Chairman and CEO Director, Investor Relations

Email: [email protected] Email: [email protected]

Tel: +1 (514) 940-0685 Tel: +1 (437) 423-3644

CAUTION REGARDING FORWARD LOOKING STATEMENTS

Certain statements contained in this news 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 (together, "forward -looking statements"). 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 condit ional,

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 the assumptions,

qualifications and limitations relating to the significance of regional exploration potential; the ability of the Company to complete the

OFS and the scope, results and timing of thereof; progress in respect of pre -construction activities at Cariboo ; the potential for

unknown mineralized structures to extend existing zones of mineralization; category conversion; the timing and status of permitting;

future consultation efforts between Osisko Development and Xatśūll First Nation; the future development and operations at the

Cariboo Gold Project; the results of ongoing stakeholder engagement; the capital resources available to the Company; the ability of

the Company to execute its planned activities, including as a result of its ability to seek additional funding; the ability of the Company

to obtain future financing and the terms of such financing including a fully -funded solution for the Cariboo Gold Project ;

management's perceptions of historical trends, current conditions and expected future developments; the ability and timing for

Cariboo to reach comme rcial production (if at all) ; sustainability and environmental impacts of operations at the Company's

properties; the results (if any) of further exploration work to define and expand mineral resources; the ability of exploration work

(including drilling) to accurately predict mineralization; the ability of the Company to expand mineral resources beyond curr ent

mineral resource estimates; the ability of the Company to complete its exploration and development objectives for its projects in

the timing contemplated and within expected costs (if at all); the ability and timing for Cariboo to reach commercial production (if

at all); the ability to adapt to changes in gold prices, estimates of costs, estimates of planned exploration and development

expenditures; the ability of the Company to obt ain further capital on reasonable terms; the profitability (if at all) of the Company's

operations; as well as other considerations that are believed to be appropriate in the circumstances, and any other informati on

herein t hat is not a historical fact may be "forward looking information". Material assumptions also include, management's

perceptions of historical trends, management's understanding of the permitting process and status thereof, the ability of exploration

(including drilling and chip sampling assays, and face sampling) to accurately predict mineralization, budget constraints and access

to capital on terms acceptable to the Company, current conditions and expected future developments, regulatory framework

remaining defined and understood, results of further exploration work to define or expand any mineral resources, 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 a nd

uncertainties that affect Osisko Development and its business. Such risks and uncertainties include, among others, risks relating to

third-party approvals, including the issuance of permits by the government , capital market conditions and the Company's ability to

access capital on terms acceptable to the Company for the contemplated exploration and development at the Company's properties;

the ability to continue current operations and exploration; regulatory fr amework and presence of laws and regulations that may

impose restrictions on mining; the ability of exploration activities (including drill results and chip sampling, and face sampling results)

to accurately predict mineralization; errors in management's geological modelling; the timing and ability of the Company to o btain

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

the global economic climate; metal and commodity prices; fluctuations in the currency markets; dilution; e nvironmental risks; and

community, non-governmental and governmental actions and the impact of stakeholder actions. Osisko Development is confident a

robust consultation process was followed in relation to its received BC Mines Act permits for the Cariboo Gold Project and co ntinues

to actively consult and engage with Indigenous nations and stakeholders. While any party may seek to have the decision related to

the BC Mines Act permits reviewed by the courts, the Company does not expect that such a review wil l impact its ability to proceed

with the construction and operation of the Cariboo Gold Project in accordance with the approved BC Mines Act permits. 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, 2023 as well as the financial statements and MD&A for the year ended December 31, 202 3, which have been

filed on SEDAR+ ( www.sedarplus.ca) under Osisko Development's issuer profile and on the SEC's EDGAR website ( www.sec.gov),

for further information regarding the risks and other factors facing the Company, its business and operations . Although the

Company's believes the expectations conveyed by the forward-looking statements are reasonable based on information available as

of the date hereof, no assurances can be given as to future results, levels of activity and achievements. The Company disclaims any

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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. Forward-looking statements are not guarantees of performance and 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.