REVIVING HISTORICAL MINING CAMPS IN NORTH AMERICA

INVESTOR PRESENTATION - MARCH 2024

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CAUTIONARY STATEMENTS

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

This presentation (this "Presentation") contains forward-looking information and forward-looking statements (together, "forward-lookingstatements") within the meaning of applicable Canadian securities laws and the United States Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical fact, are forward-looking statements and are based on expectations, estimates and projections as at the date of this Presentation. Any statement that involves discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as "expects", or "does not expect", "is expected", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates", "believes" or "intends" or variations of such words and phrases or stating that certain actions, events or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not statements of historical fact and may be forward-looking statements.

In this Presentation, forward-looking statements relate, among other things: the ability of Osisko Development Corp. ("Osisko Development", the "Company" or "ODV") to achieve the results in the Cariboo FS (as defined herein); the assumptions, qualifications and limitations of the results of the Cariboo FS, including the economic results (NPV, IRR, FCF and AISC calculations) and the sensitivity analysis of the variables included therein; LOM estimates; production capacity and expectations; expected mining methods; Cariboo being a large-scale, cash producing, long-life and profitable gold mine (or any of those things); capital cost estimates; operating cost estimates; AISC gold prices and exchange rate assumptions; the assumptions, limitations and qualifications relating to the 2024 Trixie MRE (as defined herein); mining and mine design expectations; processing expectations; infrastructure assumptions; permitting, environmental and closure expectations (timing and if at all); steps required to obtain an EAC; cooperation of stakeholders, community and partners; royalties; any potential value enhancement opportunities; the benefits (if any) of the sorting facility on reducing processing costs, increasing gold recoveries and reducing waste materials; our ability to define grade continuity within the mineralized vein corridors; future gold productions; the ability of exploration results (including drilling) to accurately predict mineralization; future mining activities; the ability of Osisko Development to identify mineral resources at our properties; the ability of Osisko Development to expand mineral resources beyond current mineral resource estimates; the utility of the existing infrastructure at the Trixie test mine ("Trixie"); the utility of historic data in respect of Trixie; the ability to adapt to changes in gold prices; estimates of costs, estimates of planned exploration and development expenditures; the ability of Osisko Development to obtain further capital on reasonable terms; the profitability of our mining operations; Osisko Development being well-positioned as a gold development company in Canada, U.S.A. and Mexico; indicative valuations; expected investor returns; mineral inventory; and estimates of gold prices. All forward-looking statements entail various risks and uncertainties that are based on current expectations and actual results may differ materially from those contained in such information.

Although Osisko Development believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements involve known and unknown risks, uncertainties and other factors and are not guarantees of future performance and actual results may accordingly differ materially from those in forward-looking statements. These uncertainties and risks relate, among other things, to: the Company's ability to achieve the results in the Cariboo FS; the realization of the assumptions, limitations, qualifications and sensitivities in the Cariboo FS; the assumptions, limitations and qualifications relating to the 2024 Trixie MRE; the ability of exploration activities (including drill results) to accurately predict mineralization; the ability to realize upon geological modelling; the ability of Osisko Development to complete further exploration activities, including drilling; property interests in the assets of Osisko Development; the ability of the results of exploration activities; risks relating to mining activities; fluctuations in spot and forward prices of gold, silver, base metals or certain other commodities; fluctuations in currency markets (such as the Canadian dollar to United States dollar exchange rate); change in international, national and local government, legislation, taxation, controls, regulations and political or economic developments; risks and hazards associated with the business of mineral exploration, development and mining (including environmental hazards, industrial accidents, unusual or unexpected formations pressures, cave-ins and flooding); inability to obtain adequate insurance to cover risks and hazards; the presence of laws and regulations that may impose restrictions on mining; employee relations; relationships with and claims by local communities and indigenous populations; availability of increasing costs associated with mining inputs and labour; the speculative nature of mineral exploration and development (including the risks of obtaining necessary licenses, permits and approvals from government authorities); and title to properties. However, there can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Investors are cautioned that forward-looking statements are not guarantees of future performance. Osisko Development cannot assure investors that actual results will be consistent with these forward-looking statements and investors should not place undue reliance on forward-looking statements due to the inherent uncertainty therein.

For additional information with respect to these and other factors and assumptions underlying the forwardlooking statements made herein concerning Osisko Development, please refer to the public disclosure record of Osisko Development, including the restated annual information form of Osisko Development for the year ended December 31, 2022 as amended, and the most recent annual and interim financial statements and related management's discussion and analysis of Osisko Development, which are available on SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov) under Osisko Development's issuer profile. The forwardlooking statements in this presentation reflect management's expectations as of 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.

This Presentation does not constitute an offer to sell or a solicitation of an offer to buy any securities in the United States or any other jurisdiction. 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 prior to registration under the U.S. Securities Act of 1933 or an exemption therefrom or qualification under the securities laws of such other jurisdiction or an exemption therefrom.

Unless otherwise noted, this Presentation has been prepared based on information available as of March 15, 2024. All currency references are to Canadian dollars, unless specified otherwise.

NON-IFRS MEASURES

ODV used in this Presentation, certain non-IFRS measures including, "all-in sustaining cost" or "AISC" and "total cash cost". All-in sustaining cost per gold ounce is defined as production costs less silver sales plus general and administrative, exploration, other expenses and sustaining capital expenditures divided by gold ounces. Cash costs are a non-IFRS measure reported by ODV on an ounces of gold sold basis. Cash costs include mining, processing, refining, general and administration costs and royalties but excludes depreciation, reclamation, income taxes, capital and exploration costs for the life of the mine. The Company believes that such measures provide investors with an alternative view to evaluate the performance of the Company. Non-IFRS measures do not have any standardized meaning prescribed under International Financial Reporting Standards ("IFRS"). Therefore they may not be comparable to similar measures employed by other companies. The data is intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS. See the section entitled "Non-IFRS Measures" in the news release of the Company dated January 3, 2022 and the Cariboo FS (as defined herein), which are available on SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov) under Osisko Development's issuer profile, and on Osisko Development's corporate website (https://osiskodev.com/cariboo-gold-project/).

CAUTIONARY NOTE TO U.S. INVESTORS

Osisko Development 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 in accordance with Canadian reporting requirements, which are governed by National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101"). NI 43-101 differs significantly from the disclosure requirements of the United States Securities and Exchange Commission (the "SEC") generally applicable to US companies. As such, the information included in this Presentation concerning mineral properties, mineralization and estimates of mineral reserves and mineral resources is not comparable to similar information made public by U.S. companies subject to the reporting and disclosure requirements of the SEC.

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CAUTIONARY STATEMENTS

CAUTION REGARDING MINERAL RESOURCE ESTIMATES

This Presentation uses the terms measured mineral resources, indicated mineral resources, 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 economic mineral reserves and that the economic viability of mineral resources that are not mineral reserves has not been demonstrated. Mineral resource estimates may be materially affected by geology, environmental, permitting, legal, title, socio-political, marketing or other relevant issues. However, other than as disclosed in this Presentation, Osisko Development is not aware of any known environmental, permitting, legal, title, socio-political, marketing or other relevant issues that could materially affect the estimates of mineral resources disclosed herein. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to the category of indicated mineral resource or measured mineral resource. 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 adopted in 2019 and incorporated by reference into NI 43-101. Under Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre-feasibility studies or economic studies except for a preliminary economic assessment as defined under NI 43-101. Readers are cautioned not to assume that further work on the stated resources will lead to mineral reserves that can be mined economically.

CAUTION 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 and resumed in the second quarter of 2023. Even with the resumption of small scale test-mining 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 current operations at Trixie, 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.

BURGIN HISTORIC RESOURCE

The past producing Burgin mine, previously operated by Kennecott until 1978, has potential for a significant silver-lead-zinc-gold deposit. The historic resource as outlined in the 2011 PEA is referenced herein. Osisko Development believes that the historic resource continues to be relevant and reliable as an indication of the potential of the Burgin Mine. Further exploration work including drilling will be required to upgrade the historic resource to current. Osisko Development cautions sufficient work has not been done to classify the historic resources as a current resource and Osisko Development is not treating the historic resources as a current resource.

SCIENTIFIC AND TECHNICAL INFORMATION

The scientific and technical information in this Presentation relating to the Cariboo Gold Project is supported by a technical report entitled "NI 43-101Technical Report - Feasibility Study for the Cariboo Gold Project" and dated January 12, 2023 (with an effective date of December 30, 2022), which was prepared for Osisko Development by BBA Engineering Ltd. with contributions from several independent consulting firms, including Falkirk Environmental Consultants Ltd., Golder Associates Ltd, InnovExplo Inc., JDS Energy and Mining Inc., KCC Geoconsulting Inc., Klohn Crippen Berger Ltd., SRK Consulting (Canada) Inc., and WSP USA Inc. (the "Cariboo FS"). Each author of the Cariboo FS is a "qualified person" within the meaning of NI 43-101 and considered to be "independent" of Osisko Development for purposes of Section 1.5 of NI 43-101. Please see the full text of the Cariboo FS for assumptions, qualifications and limitations relating to the disclosure about the Feasibility Study on the Cariboo Gold Project. An electronic copy of the Cariboo FS is available on SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov) under Osisko Development's issuer profile, and on Osisko Development's corporate website (https://osiskodev.com/cariboo-gold-project/). The Cariboo FS supersedes the technical report entitled "NI 43-101Technical Report - Preliminary Economic Assessment for the Cariboo Gold Project" and dated June 22, 2022 (with an effective date of May 24, 2022) (the "Cariboo PEA") as the current technical report in respect of the Cariboo Project for purposes of NI 43-101. Therefore, the Cariboo PEA should no longer be relied upon.

On March 15, 2023, Osisko Development announced by news release a mineral resource estimate for Trixie (the "2024 Trixie MRE"), within the Company's wider Tintic project, located in the historic East Tintic Mining District in Central Utah, U.S.A. The Company intends to file a technical report (the "Trixie MRE Report") in respect of the 2024 Trixie MRE, in accordance with NI 43-101 on SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov) under Osisko Development's issuer profile within 45 days of the date of the news release announcing the 2024 Trixie MRE. Please see the full text of the 2024 Trixie MRE news release for assumptions, qualifications and limitations relating to the 2024 Trixie MRE. The 2024 Trixie MRE supersedes the technical report entitled "NI 43-101Technical 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") prepared, reviewed, and approved by William J. Lewis, P. Geo, Ing. Alan J. San Martin, MAusIMM (CP) and Richard Gowans, P. Eng.

The scientific and technical information in this Presentation relating to the San Antonio Project is supported by the technical report entitled "NI 43-101Technical Report for the 2022 Mineral Resource Estimate on the San Antonio Project, Sonora, Mexico" and dated July 12, 2022 (with an effective date of June 24, 2022) prepared for Osisko Development by Micon International Limited (the "San Antonio Technical Report"). Each author of the San Antonio Technical Report is a "qualified person" within the meaning of NI 43-101 and considered to be "independent" of Osisko Development for purposes of Section 1.5 of NI 43-101. Please see the full text of the San Antonio Technical Report for assumptions, qualifications and limitations relating to the disclosure about the San Antonio Project. An electronic copy of the San Antonio Technical Report is available on SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov) under Osisko Development's issuer profile, and on Osisko Development's corporate website (https://osiskodev.com/san-antonio/).

QUALIFIED PERSONS

Maggie Layman, P.Geo, Vice President Exploration of Osisko Development, and Mr. François Vézina, ing., P.Eng., MBA, Senior Vice President, Project Development, Technical Services and Environment of Osisko Development Corp., each of whom is a "qualified person" for purposes of NI 43-101, have reviewed and approved the scientific and technical information in this Presentation.

ABBREVIATIONS AND UNITS OF MEASUREMENT

In this Presentation, the Company uses certain abbreviations, including: measured and indicated ("M&I"), million ("M"), thousand ("k"), metric tonnes ("t"), troy ounces ("oz"), grams per tonne ("g/t"), gold ("Au"), silver ("Ag"), copper ("Cu"), lead ("Pb"), zinc ("Zn").

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INVESTMENT HIGHLIGHTS

High-Quality Advanced

Brownfield Projects in Tier 1

Jurisdictions

Assets located in North America with

access to existing infrastructure benefitting

from grid power and skilled labor pools

Advancing the Cariboo Gold Project toward Shovel Ready Status in Canada

Feasibility production ~164 kozpa (peak >220 kozpa) over 12-year LOM; C$502M NPV5% and 20.7% IRR; 2.0 Moz Reserves1

Developing the Historic Tintic

Project in Utah, USA

Fast-tracking Trixie high-grade gold discovery while advancing prospective Cu-Au-Mo porphyry, epithermal and CRD exploration targets

World-class Team Led by CEO

Sean Roosen with Strong

Focus on Sustainable Mining

Successfully discovered, developed and operated Canadian Malartic, one of the world's largest gold mines

Large, Highly-Prospective

Exploration Properties in

North America

Land package at Cariboo Gold Project alone exceeds the entire footprint of the prolific Val d'Or Mining Camp

Building Toward Becoming a Premier North American Mid-tier Gold Mining Company

1. Refer to the full text of the Cariboo FS technical report for the assumptions, qualifications and limitations relating to disclosure about the Feasibility Study on the Cariboo Gold Project. Reserves consist of Probable Mineral Reserve of 2.031 Moz Au (16.703 Mt grading 3.78 g/t).

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Project economics base case gold price assumption of US$1,700/oz.

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MINING FRIENDLY JURISDICTIONS

Brownfield properties with existing accessible infrastructure and meaningful exploration upside

CARIBOO GOLD PROJECT

BC, Canada

100% ownership

TINTIC PROJECT

Utah, USA

100% ownership

Status

Reserves / Resources1

Property Highlights

Feasibility Study (completed Jan 2023)

EA Certificate (granted Oct 2023)

Permit (Q2 2024)

2.0 Moz Reserves (Au)

  1. Moz M&I Resources (Au)
  2. Moz Inferred Resources (Au)
  • >1,900 km2 property (83 km strike)
  • Excellent infrastructure, Indigenous partners' and BC gov't support

Status

Reserves / Resources2

Trixie Highlights

Trixie MRE (completed Mar 2024)

Trixie Decline (completed Sep 2023)

Porphyry Exploration Drilling (underway)

150 koz M&I Resources (Au)

51 koz Inferred Resources (Au)

Target processing run-rate of up to ~500 tpd3

Existing surface & UG infrastructure

>17,000 acres of patented (private) mining

claims4

SAN ANTONIO PROJECT

Sonora, Mexico

100% ownership

Regional

Property

Highlights

23 past producing mines along 5 km corridor

Prospective targetspotential high-sulphidation

epithermal Au-Ag, carbonate replacement and

Status

Reserves / Resources5

Property Highlights

Stockpile processing (complete Q3 2023)

Advancing permitting

576 koz Indicated Resources (Au)

544 koz Inferred Resources (Au)

5 known deposits with numerous gold exploration targets over 11,338 hectares

Canada

USA

Mexico

porphyry deposits

1. Refer to the full text of the Cariboo FS technical report for the assumptions, qualifications and limitations relating to disclosure about the Feasibility Study on the

Cariboo Gold Project. Mineral reserves include probable reserves 2.031 Moz Au (16.703 Mt grading

3.78 g/t Au). Mineral resources include in the

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measured category, 8 koz Au (47 kt grading 5.06 g/t Au); in Indicated, 1.564 Moz Au (14.635 Mt grading 3.32 g/t Au); in Inferred, 1.712 Moz Au (15.470 Mt grading

3.44 g/t Au). M&I resources are exclusive of mineral reserves. 2. The 2024 Trixie MRE was disclosed in ODV's news release dated March 15,

2024 (ODV Announces Mineral Resource Update For The Trixie Deposit, Tintic Project). M&I resources consist of: (i) measured mineral resources (120 kt grading 27.36 g/t Au and 61.73 g/t Ag); and (ii) indicated mineral resources (125 kt grading 11.17 g/t Au and 59.89 g/t Ag). Inferred mineral resources

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consist of 202 kt grading 7.80 g/t Au and 48.55 g/t Ag. 3. Short tons. 4. 14,200 acres of patented mining claims and a further approximately 3,000 acres of overwhelmingly leased patented mining claims. 4. Refer to the full text of San Antonio Technical Report for the assumptions, qualifications and limitations

relating to the San Antonio Gold Project and the San Antonio Technical Report. Indicated resources contain 577 koz Au (14.9 Mt grading 1.20 g/t Au), and Inferred resources 543 koz (16.5 Mt grading 1.02 g/t Au).

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EXECUTING ON VISION & STRATEGY

JUNIOR

INTERMEDIATE

PRODUCER

GOLD

PRODUCER

DEVELOPER

TINTIC PROJECT

100 - 250

350 - 500

KOZ PER YEAR

ADVANCING HIGH-GRADE TRIXIE

KOZ PER YEAR

CARIBOO GOLD

FEASIBILITY STUDY

PRICE / NAV (x)1

RE-RATE

0.5x

POTENTIAL

0.3x

0.3x

ODV

All Peers

Tier I Peers

0.6x

0.7x

All Peers

Tier I Peers

RE-RATE

POTENTIAL

1.0x

0.8x

All Peers

Tier I Peers

Source: Broker research. Company disclosures. S&P CapitalIQ. Market data as at March 13, 2024.

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1. Based on consensus estimates. All Peers include select >US$300M precious metals companies. Tier 1 Peers include select >US$300M precious metals companies with assets located in North America and Australia.

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CAPITAL STRUCTURE SNAPSHOT

Osisko Development Corp.1,2

Shareholder Ownership

Current Share Price (closing price on March 13, 2024)

C$3.39

/share

26%

Basic Shares Outstanding

84.1

million

Institutional

40%

Options, DSUs, and RSUs

4.1

million

Investors

Warrants3

27.0

million

Osisko Gold

Royalties

Fully Diluted Shares Outstanding

115.2

million

34%

Market Capitalization - Basic

C$285.2

million

Retail Investors

Cash & Cash Equivalents

C$71.5

million

& Former Tintic

Investment Holdings (marketable securities)

C$28.4

million

Shareholders5

Total Debt4

C$19.7

million

Enterprise Value - Basic

C$205.0

million

Relative Valuation: Price / NAV

Analyst Coverage

0.8x

0.7x

0.6x

0.6x

0.4x

0.4x

0.4x

0.4x

0.4x

0.3x

Mid-tier Prod.

Junior Prod.

NFG

OSK

PRB

PRYM

PPTA

RGD

SGD

SKE

0.3x

(PNAV, x)

0.3x

0.3x

0.3x

0.3x

0.2x

0.2x

0.2x

LGD

OIII

SEA

BRVO

ITR

TLG

FF

Source: Company disclosures. Broker research. S&P CapitalIQ.

1. Market data, including share price and share count, as at March 13, 2024. 2. Financial information presented as at Sep 30, 2023. 3. 33.9M warrants outstanding exercisable into 24M equivalent shares + 7.8M warrants issued as part of the March 2023 public offering.

4. Includes long-term debt and lease liabilities pertaining to equipment financing. 5. Refer to ODV news release dated May 30, 2022 (ODV Completes Acquisition of Tintic Consolidated Metals, Finalizes Binding Stream Terms And Satisfies Escrow Release Condition For Brokered Subscription Receipt Financing).

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CARIBOO GOLD PROJECT

British Columbia, Canada 100% Ownership

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Virtual Tour

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CARIBOO GOLD PROJECT: ASSET SNAPSHOT

Developing a mining camp in the under-explored Cariboo gold belt

OWNERSHIP

LOCATION /

MINE TYPE

METALS

STAGE

LAND PACKAGE

100% ODV

BC, Canada

Underground

Gold

Feasibility Study

Mosquito Wells

192,000 ha

Silver

(Jan-23)

  • Two prospective mineralized trends over 83 km strike (192,000 ha property) with 700 km drilled over the last 7 years
  • Completed a Feasibility Study envisioning a phased 12-year mine life with a C$502M NPV5% and production up to 223 koz/yr of gold
  • Brownfield site with year-round access, infrastructure and work force, and strong support from the BC government and Indigenous partners
  • Upcoming catalysts: EA Certificate (granted) ; Permits (Q2 2024)

Reserves & Resources1

Tonnes

Gold Grade

Contained Gold

Classification

(000's)

(g/t)

(000's oz)

Probable reserves

16,703

3.78

2,031

Measured resources

47

5.06

8

Indicated resources

14,635

3.32

1,564

Measured & indicated

14,682

3.33

1,571

Island

Mountain

Wells

Barkerville

Quesnel

QR Mill

Mt Polley Mine

Gibraltar Mine

Shaft

Valley

Barkerville

NE Cow

Mountain

SE Cow

Lowhee

BC Vein

Cow

KL

Mountain Barkerville

Inferred resources

15,470

3.44

1,712

ODV Mineral Tenure - 192,000 ha property

1. Refer to the full text of the Cariboo FS technical report for the assumptions, qualifications and limitations relating to disclosure about the Feasibility Study on the Cariboo Gold Project. Mineral resources include in the measured category, 8 koz Au (47 kt grading 5.06 g/t Au); in Indicated, 1.564 Moz Au (14.635 Mt grading 3.32 g/t Au); in Inferred, 1.712 Moz Au (15.470 Mt grading 3.44 g/t Au). M&I resources are exclusive of mineral reserves.

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EXCELLENT INFRASTRUCTURE, ACCESSIBLE PROJECT LOCATION

Cow Portal to Lowhee Zone

Brand New Roadheader

3. Bolting with assisted

1. Excavation

4. Conveyor

with head

mechanical arm

for loading

2. Extraction

with plato

Quesnel River Mine (QR Mill) Site

100% owned, fully permitted and operational

produced gold in 2022

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Osisko Development Corp. published this content on 15 March 2024 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 15 March 2024 20:33:54 UTC.