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OSISKO DEVELOPMENT REPORTS FOURTH QUARTER AND YEAR-END 2023 RESULTS (All monetary references are expressed in Canadian dollars

Financials

NYSE | TSXV: ODV NEWS RELEASE

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OSISKO DEVELOPMENT REPORTS FOURTH QUARTER AND YEAR-END 2023

RESULTS

(All monetary references are expressed in Canadian dollars, unless otherwise indicated)

Montreal, Québec, March 28, 202 4 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the "Company") reports its financial and operating results for the three

and twelve months ended December 31, 2023 ("Q4 2023").

Q4 2023 HIGHLIGHTS

Operating, Financial and Corporate Updates:

• 2,090 ounces of gold sold by the Company from operating activities in the fourth quarter (10,743

ounces of gold sold in 2023), comprising of:

o 1,622 ounces of gold sold from the Trixie test mine (" Trixie") located within the

Company's wider Tintic Project (4,959 ounces of gold sold in 2023);

o 468 ounces of gold sold from the Cariboo Gold Project ("Cariboo" or the "Cariboo Gold

Project") by processing stockpiles at a third-party processing facility (3,272 ounces of

gold sold in 2023); and

o nil ounces of gold sold from the San Antonio Gold Project ("San Antonio" or the "San

Antonio Project") (2,512 ounces of gold sold in 2023).

• $6.9 million in revenues ($31.6 million in 2023) and $6.4 million in cost of sales ($32.3 million

in 2023) generated from operating activities in the fourth quarter.

• On October 10, 2023, the Company announced that it received an Environmental Assessment

("EA") Certificate for the Company's 100%-owned Cariboo Gold Project. The EA Certificate was

granted by the Environmental Assessment Office of the Province of British Columbia (" EAO")

and supported by approval decisions from The Honourable George Heyman, Minister of

Environment and Climate Change Strategy and The Honourable Josie Osbourne, Minister of

Energy, Mines and Low Carbon Innovation. The EA process was completed in consultation with

and support of the First Nations partners.

• On November 15, 2023, the Company and O3 Mining Inc. (" O3 Mining ") announced the

successful formation and capitalization of "Electric Elements Mining Corp." (" EEM") to explore

for lithium potential on certain James Bay properties in Eeyou Istchee Area, Nunavik, Québec

transferred to EEM by the Company and O3 Mining (the "Spinout Transaction"). Subsequently,

EEM completed an equity financing for aggregate gross proceeds to EEM of approximately $4.1

million (the " Financing") to fund the first phase of exploration and for general corporate

purposes. After giving effect to the Financing, Osisko Development and O3 Mining hold

approximately 47% and 12%, respectively, of the outstanding EEM shares.

• On December 28, 2023, the Company announced that Mr. Luc Lessard, Chief Operating Officer

("COO") would retire from the Company at the end of 2023 to pursue other personal and

professional commitments. Mr. Éric Tremblay, a Director on the Board of Directors and Chair of

the Environmental, Health and Sustainability Committee, has taken on the position of interim

COO. Additionally, in December 2023, Mr. Chris Pharness, Vice President, Sustainable

Development, departed the Company.

• As at December 31, 2023, the Company had approximately $43.5 million in cash.

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Tintic Project – Utah, U.S.A. (100%-owned)

• 2023 Trixie Exploration Program. During Q4 2023, the Company continued underground

exploration and delineation activities on the existing Trixie deposit as part of its 2023

underground infill and exploration program.

o In 2023 , a total of 6,028 m eters (" m") (19,776 f eet ("ft")) were drilled in 73

underground diamond drill holes, including an additional 1 geotechnical hole totalling

349 m (1,145 ft) , with a ssay results for 17 and 8 diamond drilling holes released on

October 11, 2023, and December 21, 2023, respectively. Assay results for all remaining

drill holes from the 2023 exploration program were released on February 22, 2024 (see

Subsequent to Q4 2023).

• Porphyry Target Drilling. An initial regional surface diamond drilling campaign to test for

copper-gold-molybdenum porphyry mineralization potential, namely in the Big Hill area,

commenced in early December 2023, following receipt of the required surface drill permits. An

initial 3,000 meter (9,842 feet) of two drilling holes comprises phase one of the surface diamond

drilling program.

o One diamond drill rig is currently active at surface testing a porphyry target at Big Hill

and is at a current depth of 378 m (1,240 ft). The Company completed a first drill hole

at Big Hill to a depth of 1,180 m (3,872 ft) when it transitioned out of the prospective

alteration zone, and commenced the second drill hole by repositioning the drill rig at a

modified angle.

o One diamond drill hole tested a copper -gold-porphyry target below Trixie from

underground and was drilled to a depth of 759.6 m (2,492 ft) when it crossed the Eureka

Lily Fault to the east and out of the prospective alteration zone. Further drill testing of

a copper-gold porphyry target at depth below the Trixie deposit is recommended to the

west.

o The drilling of porphyry targets continue s and is expected to be completed by the end

of Q2 2024 , at which point the Company will provide an exploration update including

any material assay results relating to the preliminary drilling program, as appropriate.

• Exploration Target Potential. The Company has advanced rehabilitation at the 750 level to

allow for further underground diamond drilling to test for the down dip extent of the 756 zone

and the porphyry target below Trixie. Data compilation from historic mines in the area is ongoing

and is anticipated to generate additional exploration drill targets on the greater Tintic Project

property.

o Test mining activities at Trixie were suspended in December 2023 and are expected to

remain in care and maintenance for the foreseeable future pending completion of

technical work and additional funding.

• 2024 Trixie Mineral Resource Estimate ("MRE"). Subsequent to Q4 2023, on March 15,

2024, the Company released an updated MRE for the underground Trixie deposit (the " 2024

Trixie MRE ") in accordance with NI 43 -101 (as defined herein). The 2024 Trixie MRE

incorporated an additional 1,674 underground chip samples over 1,678 m (5,507 ft) of

underground development, and 7,385 m of drilling (24,229 ft) in 122 holes completed since the

initial Trixie MRE (the " 2023 Trixie MRE "), with an effective date of January 10, 2023. The

2024 Trixie MRE, which will be further described in the full technical report being prepared for

the 2024 Trixie MRE in accordance with NI 43-101, comprises:

o Measured resources of 119,847 tonnes grading 27.36 grams per tonne (" g/t") gold

("Au") and 61.73 g/t silver ("Ag"), for a total of 105,437 ounces ("oz") Au and 237,868

oz Ag.

o Indicated resources of 124,743 tonnes grading 11.17 g/t Au and 59.89 g/t Ag, for a

total of 44,811 oz Au and 240,211 oz Ag.

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o Inferred resources of 201,603 tonnes grading 7.80 g/t Au and 48.55 g/t Ag, for a

total of 50,569 oz Au and 314,678 oz Ag.

• Trixie Non-cash Impairment. The Company completed a review of the carrying value of its

assets in accordance with International Financial Reporting Standards as at December 31, 2023.

As a result of this review, a non-cash impairment gross charge of $160.5 million ($115.9 million

on a net carrying value basis) was recognized for Trixie in the Company's consolidated financial

statements for the year ended December 31, 2023.

o As previously disclosed, t he impairment charge is primarily a result of, among other

things, assumptions related to required future exploration and capital expenditures,

potential mining and processing methods, and average processed gold grades related

to the gold targets only.

o The asset impairment charge relates only to Trixie and is a non-cash item and, for the

avoidance of doubt, has no impact on Company's cash flows.

Cariboo Gold Project – British Columbia, Canada (100%-owned)

• Permitting Progress. Receipt of the EA Certificate in October 2023 successfully concludes the

EA process for the Cariboo Gold Project, which was launched in October 2019 (see Figure 1). A

Joint Permit Application for the BC Mines Act / Environmental Management Act is in progress,

and the Company is currently advancing through round 3 of the Mine Review Committee review

period. The Company anticipates receiving permits in Q2 2024 which would enable construction

of the Cariboo Gold Project. The Company continues to explore its options, including sourcing a

fully-funded solution for the Cariboo Gold Project.

Figure 1: Cariboo Gold Project – Permitting Timeline Summary

• Pre-Construction Activities. Subsequent to Q4 2023, the Company secured a US$50 million

Credit Facility (as defined herein) , which will be exclusively used to fund ongoing detailed

engineering and pre -construction activities at the Cariboo Gold Project. This includes the

commencement of an underground development drift from the existing Cow Portal into the

Cariboo Gold Project's mineral deposit at Lowhee Zone and extraction of 10,000 tonnes of

material under an existing provincial permit expected to be completed by the end of Q4 2024.

San Antonio Gold Project – Sonora State, Mexico (100%-owned)

• Following completion of processing of the remaining stockpile inventory from the heap leach pad

in Q3 2023, the San Antonio Gold Project was placed into care and maintenance, with no

production anticipated henceforth.

• The Company awaits next steps from the government of Mexico with respect to the permitting

process and the status of open pit mining in the country.

NYSE: ODV | TSXV: ODV

www.osiskodev.com 1

CARIBOO PROJECT PERMITTING TIMELINE

Significant progress made in de-risking the project through the permitting process

ENVIRONMENTAL ASSESSMENT

Early Engagement

Detailed Project Description

EA Readiness Decision

Process Planning

Application Development and Review

EAO* Review of Revised Application

Effects Assessment

Recommendation & Decision

PERMIT APPLICATION

Mine Review Committee (MRC) Screening

MRC Review

Drafting of initial reports, permits, conditions

Review of draft materials by MRC and ODV

Finalization of reports, permits, conditions

H1 H2

2020 2021

H1 H2

2022

Q1 Q2 Q3 Q4

Submission of Detailed Project Description

✓

ODV Joint Application Submission

Decision

APPLICATION REFERRAL*Environmental Assessment Office (EAO)

Revised Application Submission✓

✓

EA Certificate

Referral

2023

Q1 Q2 Q3 Q4

2024

Q1 Q2

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• Strategic Review. The Board of Directors of the Company has authorized a strategic review of

the San Antonio Gold Project, which includes exploring the potential for a financial or strategic

partner in the asset or for a full or partial sale of the asset. The Company has engaged a financial

advisor in connection with such strategic review.

SUBSEQUENT TO Q4 2023

• On February 2, 2024, the Company announced that Mr. Francois Vézina resigned from his

position as Senior Vice President, Project Development, Technical Services and Environment

effective as of March 1, 2024 to pursue outside interests in the mining sector.

• On February 22, 202 4, the Company disclosed the remaining assay results from 14 diamond

drilling holes and chip sampl es from new development areas as part of its 2023 exploration

program at Trixie. Select assay results highlights included (see news release dated February 22,

2024):

o 66.04 g/t Au and 167.64 g/t Ag over 8.99 m in hole TRXU-DD-23-072A (1.93 troy

ounces per short ton ("oz/t") Au and 4.89 oz/t Ag over 29.50 ft).

• On March 4, 2024, the Company announced that the Company, as guarantor, and Barkerville

Gold Mines Ltd., its wholly-owned subsidiary, as borrower, entered into a credit agreement dated

March 1, 2024 with National Bank of Canada in connection with a US$50 million delayed draw

term loan (the " Credit Facility"). The Credit Facility will be exclusively used to fund ongoing

detailed engineering and pre -construction activities at the Cariboo Gold Project. On March 1,

2024, an amount of US$25.0 million ($33.9 million) was drawn under the Credit Facility, net of

US$1.0 million ($1.4 million) of fees.

KEY UPCOMING MILESTONES

Key Milestones

for Projects

Expected Timing

of Completion

Anticipated

Remaining Costs*

Cariboo Gold Project

Environmental Assessment Certificate(1) Completed – Q4 2023 —

Preparatory Work for Bulk Sample(2) Completed – Q4 2023 —

Bulk Sample(4) Q4 2024 $13.5 million

Water and Waste Management Q2 2024 $2.4 million

Electrical and Communication Q2 2024 $1.4 million

Surface Infrastructure Q2 2024 $3.4 million

Management, environmental, and other pre-permitting work Q2 2024 $1.8 million

Detailed engineering and permitting(3) Q2 2024 $9.0 million

Tintic Project

Ramp Development – 1st stage Completed – Q3 2023 –

Regional Drilling Q4 2023 – Q2 2024 $7.2 million

Updating mineral resource estimates Completed – Q1 2024 $0.5 million

*as at December 31, 2023

Notes:

(1) On October 10, 2023, the Company received an Environmental Assessment Certificate for the Cariboo Gold Project, which was

granted by the Environmental Assessment Office of the Province of British Columbia and is supported by approval decisions from

The Honourable George Heyman, Minister of Environment and Climate Change Strategy and The Honourable Josie Osbourne,

Minister of Energy, Mines and Low Carbon Innovation. Receipt of the Environmental Assessment Certificate concludes the

environmental assessment process for the Cariboo Gold Project, which was initiated in October 2019.

(2) This refers to the preparatory work as commenced in Q3 2023 following the Environmental Assessment Certificate to prepare

for the bulk sample with an associated cost of approximately C$1 million.

(3) These are activities contributing towards the completion of permitting activities, which is presently expected to be completed in

Q2 2024. Additional costs and time relating to engineering, including water and waste management and electrical and

communication, will be required in the construction phase (after a positive construction decision is made and project financing

is obtained).

(4) The bulk sample expenditures include up until the end of June 2024 and were approved by the Board of Directors.

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Consolidated Financial Statements

The Company's audited consolidated financial statements (the " Financial Statements ") and

management's discussion and analysis ("MD&A") for the three and twelve months ended December 31,

2023 are available on the Company's website at www.osiskodev.com, on SEDAR+ (www.sedarplus.ca)

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

Qualified Persons

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

by Maggie Layman, P.Geo., Vice President, Exploration 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 Cariboo FS 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 Con sulting (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 "Cariboo Technical Report"). 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.

Certain scientific and technical information relating to the Tintic Project and the updated mineral

resource estimate for the Trixie deposit (the "2024 Trixie MRE "), is supported by the news release

disseminated by the Company on March 15, 2024 (titled "Osisko Development Announces Mineral

Resource Update for the Trixie Deposit, Tintic Project ") (the "MRE Update News Release"). The key

assumptions, parameters, qualifications, procedures and methods underlying the 2024 Trixie MRE,

certain of which are described in the above -noted news release, will be further described in the full

technical report being prepared for the 2024 Trixie MRE in accordance with NI 43 -101, and will be

available on SEDAR+ (www.sedarplus.ca) under the Company 's issuer profile within 45 days from the

date of the MRE Update News Release. Information relating to the 2024 Trixie MRE provided herein is

qualified in its entirety by the full text of the MRE Update News Release which is available electronically

on the Company's website or on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov) under the

Company's issuer profile, including the assumptions, qualifications and limitations therein.

Until a technical report relating to the 2024 Trixie MRE is filed on SEDAR+, the current technical report

(within the meaning of NI 43-101) on the Tintic Project is the technical report titled "NI 43-101 Technical

Report, Initial Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, United States of

America" dated January 27, 2023 (with an effective date of January 10, 2023) (the "2023 Trixie MRE"),

which was prepared by William J. Lewis, P. Geo, Ing. Alan J. San Martin, MAusIMM (CP) and R ichard

Gowans, P. Eng (the "Tintic Technical Report "). The full text of the 2023 Trixie MRE is available

electronically on the Company's website or on SEDAR+ (www.sedarplus.ca) and on EDGAR

(www.sec.gov) under the Company's issuer profile, including the assumptions, qualifications and

limitations therein. Once a technical report in respect of the 2024 Trixie MRE is filed on SEDAR+

(www.sedarplus.ca) under the Company's issuer profile, it will automatically supersede the Tintic

Technical Report.

Information relating to San Antonio is supported by the technical report titled " NI 43-101 Technical

Report for the 2022 Mineral Resource Estimate on the San Antonio Project, Sonora, Mexico", dated July

12, 2022 (with an effective date of June 24, 2022) prepared for the Company by independent

representatives of Micon International Limited (the "San Antonio Technical Report", collectively with

the Trixie Technical Report and Cariboo Technical Report, the "Technical Reports"). Reference should

be made to the full text of the San Antonio Technical Report, which was prepared in accordance with NI

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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.

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 hi storical 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

CAUTIONARY STATEMENTS

Cautionary Statement Regarding Estimates of Mineral Resources

This news release uses the terms measured, indicated and inferred mineral resources as a relative measure of the level of confidence

in the resource estimate. Readers are cautioned that mineral resources are not mineral reserves and that the economic viabili ty of

resources that are not mineral reserves has not been demonstrated. The mineral resource estimate disclosed in this news release

may be materially affected by geology, environmental, permitting, legal, title, socio-political, marketing or other relevant issues. The

mineral resource estimate is classified in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum's "CIM Definition

Standards on Mineral Resources and Mineral Reserves" incorporated by reference into NI 43-101. Under NI 43 -101, estimates of

inferred mineral resources may not form the basis of feasibility or pre -feasibility studies or economic studies except for preliminary

economic assessments. Readers are cautioned not to assume that further work on the stated resources will lead to mineral reserves

that can be mined economically.

Cautionary Statement Regarding Financing Risks

The Company's development and exploration activities are subject to financing risks. At the present time, the Company has

exploration and development assets which may generate periodic revenues through test mining, but has no mines in the commercial

production stage that generate positive cash flows. The Company cautions that test mining at its operations could be suspended at

any time. The Company's ability to explore for and discover potential economic projects, and then to bring them into production, is

highly dependent upon its ability to raise equity and debt capital in the financial markets. Any projects that the Company de velops

will require significant capital expenditures. To obtain such funds, the Company may sell additional securities including, but not limited

to, the Company's shares or some form of convertible security, the effect of which may result in a substantial dilution of the equity

interests of the Company's Shareholders. Alternatively, the Company may also sell a part of its interest in an asset in order to raise

capital. There is no assurance that the Company will be able to raise the funds required to continue its exploration programs and

finance the development of any potentially economic deposit that is identified on acceptable terms or at all. The failure to obtain the

necessary financing(s) could have a material adverse effect on the Company 's growth strategy, results of operations, financial

condition and project scheduling.

Cautionary Statement Regarding Test Mining Without Feasibility Study

The Company cautions that its prior decision to commence small-scale underground mining activities and batch vat leaching at the

Trixie test mine was made without the benefit of a feasibility study, or reported mineral resources or mineral reserves, demonstrating

economic and technical viability, and, as a result there may be increased uncertainty of achieving any particular level of recovery of

material or the cost of such recovery. The Company cautions that historically, such projects have a much higher risk of economic and

technical failure. Small scale test-mining at Trixie was suspended in December 2022 , resumed in the second quarter of 2023 , and

suspended once again in December 2023 . If and when small-scale test-mining recommences at Trixie, there is no guarantee that

production will continue as anticipated or at all or that anticipated production costs will be achieved. The failure to continue production

may have a material adverse impact on the Company's ability to generate revenue and cash flow to fund operations. Failure to

achieve the anticipated production costs may have a material adverse impact on the Company's cash flow and potential profitability.

In continuing operations at Trixie after closing, the Company has not based its decision to continue such operations on a feasibility

study, or reported mineral resources or mineral reserves demonstrating economic and technical viability.

Cautionary Statement to U.S. Investors

The Company is subject to the reporting requirements of the applicable Canadian securities laws and as a result reports information

regarding mineral properties, mineralization and estimates of mineral reserves and mineral resources, including the information in its

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technical reports, financial statements, MD&A and this news release, in accordance with Canadian reporting requirements, which are

governed by NI 43-101. As such, such information concerning mineral properties, mineralization and estimates of mineral reserves

and mineral resources, including the info rmation in its technical reports, financial statements, MD&A and this news release, is not

comparable to similar information made public by U.S. companies subject to the reporting and disclosure requirements of the U.S.

Securities and Exchange Commission ("SEC").

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 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 the assumptions,

qualifications and limitations relating to the significance of the high-priority target drilling; the utility of modern exploration

techniques; the potential for parallel high -grade gold fissure zones; the potential of Tintic to host a copper -gold porphyry center;

the significance of regional exploration potential; the results of the 2024 Trixie MRE; the potential for unknown mineralized structures

to extend existing zones of mineralization; category conversion; the timing and status of permitting; the Company's ability to prepare

and file a technical report in respect of the 2024 Trixie MRE within 45 days from March 15, 2024; the capital resources available to

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

funding or to reduce planned expenditures; the ability of the Company to obtain fut ure financing and the terms of such financing;

management's perceptions of historical trends, current conditions and expected future developments; the utility and significance of

historic data, including the significance of the district hosting past producing mines; future mining activities; the potential of h igh

grade gold mineralization on Trixie and Cariboo; the results (if any) of further exploration work to define and expand minera l

resources; the ability of exploration work (including drilling) to accurately predict mineralization; the ability to generate additional

drill targets; the ability of management to understand the geology and potential of the Company's properties; the abili ty of the

Company to expand mineral resources beyond current mineral resource estimates; the timing and ability of the Company to complete

upgrades to the mining and mill infrastructure at Trixie (if at all); continuation of test mining activities at Trixie (if at all); the timing

and ability of the Company to ramp up processing capacity at Trixie (if at all); the ability of the Company to complete its exploration

and development objectives for its projects in 202 4 in the timing contemplated and within expected costs (if at all); the ongoing

advancement of the deposits on the Company's properties; the deposit remaining open for expansion at depth and down plunge;

the ability to realize upon any mineralization in a manner that is economic; the Cariboo project design and ability and timing to

complete infrastructure at Cariboo (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 obtain further capital on reasonable terms; the profitability (if at all) of the Company's operations; the Company

being a well-positioned gold development company in Canada, USA and Mexico; the ability and timing for the permitting at San

Antonio; the impact of permitting delays at San Antonio; the outcome of the strategic review of the San Antonio Project; sustainability

and environmental impacts of operations at the Company's properties; a s 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 his torical trends, 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 f uture 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 Devel opment 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

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 framework 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 ability to expand

operations or complete further exploration activities; the timing and ability of the Company to obtain 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; environmental risks; and community, non-governmental

and governmental actions and the impact of stakeholder actions. Readers are urged to consult the disclosure provided under th e

heading "Risk Factors" in the Company's annual information form for the year ended December 31, 202 3 as well as the financial

statements and MD&A for the year ended December 31, 2023, 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 futu re

results, levels of activity and achievements. The Com pany 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. 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 s hould

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.