Slide 1: Reviving Historic Mining Camps in North America
REVIVING HISTORIC MINING CAMPS IN NORTH AMERICA INVESTOR PRESENTATION – APRIL 2025 ODV NYSE TSXV | osiskodev.com
Slide 2: Cautionary Statements: Forward-Looking Information
CAUTIONARY STATEMENTS CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION Certain statements contained in this presentation (this "Presentation") may be deemed "forward-looking statements" within the meaning of the United States Private Securities Litigation Reform Act of 1995 and "forward-lo
Slide 3: Cautionary Statements: Mineral Resource Estimates and Test Mining
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 re
Slide 4: Investment Highlights
INVESTMENT HIGHLIGHTS Past-Producing Advanced Advancing the Fully-Permitted Developing the Historic Tintic Brownfield Projects in Tier 1 Cariboo Gold Project in Project in Utah, USA Jurisdictions Canada Fast-tracking Trixie high-grade gold Assets located in North America with Feasibility production
Slide 5: 2024 Highlights and Upcoming Catalysts
2024 HIGHLIGHTS AND UPCOMING CATALYSTS › Granted BC Mines Act and Environmental Management Act permits for Cariboo Gold Project enabling to move forward with project 2024 construction and operation › Bulk sample and underground ramp development successfully completed (~1.2 km) to access target area
Slide 6: Mining Friendly Jurisdictions
MINING FRIENDLY JURISDICTIONS Brownfield properties with existing accessible infrastructure and meaningful exploration upside BC, Canada Utah, USA CARIBOO GOLD PROJECT 100% ownership TINTIC PROJECT 100% ownership EA Certificate (granted Oct 23) Trixie MRE (completed Mar 24) Mines Act Permits (grante
Slide 7: Executing on Vision & Strategy
EXECUTING ON VISION & STRATEGY log scale Junior and Intermediate Gold Producers $17.0B $10.0 $10B CAD$ Billion Market Capitalization1 $5B $4.6B $4.2B $3.9B $2.6B $2B Scarcity of Permitted Assets Cariboo is one of the few fully-permitted projects in a limited universe of developers with $1.0 gold ass
Slide 8: Capital Structure Snapshot
CAPITAL STRUCTURE SNAPSHOT Osisko Development Corp.1,2 Shareholder Ownership Current Share Price (closing price on April 11, 2025) C$2.22 /share 40% Basic Shares Outstanding 136.6 million Institutional Investors Options, DSUs, and RSUs 6.0 million 24% Osisko Gold Warrants3 78.1 million Royalties Ful
Slide 9: Cariboo Gold Project
Video camera outline Watch Video CARIBOO GOLD PROJECT British Columbia, Canada 100% Ownership Double Tap Gesture with solid fill ODV NYSE TSXV 9 Virtual Tour osiskodev.com
Slide 10: Cariboo Gold Project: Asset Snapshot
CARIBOO GOLD PROJECT: ASSET SNAPSHOT Developing a mining camp in the under-explored Cariboo gold belt LOCATION / OWNERSHIP MINE TYPE METALS STAGE LAND PACKAGE Mosquito Wells 100% ODV BC, Canada Underground Gold FS (Jan-23) >185,000 ha Silver Permit (Nov-24) Shaft Island Valley Barkerville Two pros
Slide 11: Excellent Infrastructure, Accessible Project Location
EXCELLENT INFRASTRUCTURE, ACCESSIBLE PROJECT LOCATION Cow Portal to Lowhee Zone Sandvik Roadheader 1. Excavation 3. Bolting with assisted 4. Conveyor with head mechanical arm for loading 2. Extraction with plato Quesnel River Mine (QR Mill) Site 10 km 100% owned, fully permitted and operational prod
Slide 12: Bulk Sample and Underground Development Progress
BULK SAMPLE AND UNDERGROUND DEVELOPMENT PROGRESS Underground development 100% complete to access target area; results expected in Q2 2025 Shaft › Objective of the bulk sample is to advance underground development into Valley the ore body and extract up to 10,000 Mosquito Cow tonnes of mineralized ma
Slide 13: Cariboo Project Permitting: Successfully Completed
CARIBOO PROJECT PERMITTING: SUCCESSFULLY COMPLETED BC Mines Act permits granted on Nov 20, 2024 — main permits for project construction & operation 2020 2021 2022 2023 2024 H1 H2 H1 H2 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 ENVIRONMENTAL ASSESSMENT Early Engagement Detailed Project Description Submissi
Slide 14: Cariboo Feasibility Study at a Glance
CARIBOO FEASIBILITY STUDY AT A GLANCE1 Download from cloud with solid fill Feasibility Study Presentation Mine Life First Production Initial Capex Gold Recovered 12 years 2025 (Phase I) C$137 M 1.87 Moz Phase I (1-3); Phase II (4-12) 2028 (Phase II) expansion C$451 M (2.03 Moz Probable Reserves1) Go
Slide 15: Cariboo Is an Attractive Project in a Tier 1 Jurisdiction
CARIBOO IS AN ATTRACTIVE PROJECT IN A TIER 1 JURISDICTION GRID POWER ACCESSIBLE >$250M EXISTING 6.6¢ per kWh PROJECT LOCATION INFRASTRUCTURE Equipment and fleet Connected via Highway 26 and Fully permitted and functional QR electrification benefitting from located near major towns with mill, equipme
Slide 16: Mine Design Summary
MINE DESIGN SUMMARY Phase 1 production to come from Lowhee, Shaft and Mosquito deposits The vertical extent of all mineable blocks averages ~350 meters Mineralization is open at depth and along strike and between and mineralization has been tested down to 900 meters some deposits due to lack of
Slide 17: Cariboo 2023 Feasibility Study Summary
CARIBOO 2023 FEASIBILITY STUDY SUMMARY Download from cloud with solid fill Feasibility Study Summary Operating Metrics1 SUMMARY ECONOMIC RESULTS1 (US$1,700/oz Au) Phase 1 Phase 2 LOM (2025 – 2027) (2028 – 2037) (12 years) LOM (12 years) Ore Mined Mt 1.5 15.2 16.7 Total Revenue C$M $4,126 Cumulative
Slide 18: Well Positioned Among Canadian UG Mines & Projects
WELL POSITIONED AMONG CANADIAN UG MINES & PROJECTS Cariboo compares favourably relative to existing underground gold operations and projects in Canada Gold Production1 Head Grade1 All-in Sustaining Costs1 (koz Au) (g/t Au) (US$/oz) Meadowbank 505 Macassa 15.6 Back River $775 CDN Malartic (Odyssey) 4
Slide 19: Processing Capacity: Expansion Potential
PROCESSING CAPACITY: EXPANSION POTENTIAL CARIBOO GOLD MINE SITE COMPLEX STREAMLINED Phase 1 (years 1-3) Grinding & Flotation Ore Sorting (Phase 2) DESIGN THAT Phase 2 (years 4-12) (Phase 1)1 Expansion Potential ALLOWS SCALING Office, Ore Sorting Warehouse & Garage PROCESSING (Phase 2) (Phase 1) CAPA
Slide 20: Nature of Mineralization Favorable to Ore Sorting
NATURE OF MINERALIZATION FAVORABLE TO ORE SORTING Metallurgical testing to date indicates that Cariboo mineralization is well suited for ore sorting Ore Sorting Separates Gold Rich (11.0 g/t1) Host Rock from Unmineralized Sandstone 481 VEIN CORRIDORS Pyrite hosted in quartz veins High Density Materi
Slide 21: Ore Sorter Up "Grade" Process
ORE SORTER UP "GRADE" PROCESS1 Ore sorting provides significant benefits at low opex of ~$1-2 per tonne feed View the ore sorter technology in action here A GREEN TECHNOLOGY › Reduced energy, water and chemical usage › +43% of mined material removed as waste (used as backfill and/or for road constru
Slide 22: Cariboo Resource Conversion Potential
CARIBOO RESOURCE CONVERSION POTENTIAL Plan & Isometric View – North/Central Portion of Level 1050 Shaft Zone +/-15m Video camera outline Pink zones represent Reserve stopes based on 2023 Watch Video Feasibility study design Reserves include a total of 2.03 Moz1 Reserve Stopes Resource Stopes Current
Slide 23: Near Stope Resource Conversion Potential
NEAR STOPE RESOURCE CONVERSION POTENTIAL Resource stopes are located in close proximity to reserve stopes and planned infrastructure/development 50 m around the Reserves Reserve Stope1 Indicated Resource1 Inferred Resource1 Source: Based on 2023 Cariboo FS Design. 1. Refer to the full text of the Ca
Slide 24: Cariboo Exploration Potential at Depth
CARIBOO EXPLORATION POTENTIAL AT DEPTH 2.03 Moz Au at 3.8 g/t Au in Probable Reserves1 >500 m additional depth potential of known vein corridors 1.57 Moz Au at 3.3 g/t Au M&I resources, 1.71 Moz at 3.44 g/t Au adjacent to mine plan untested Inferred Resources with potential to be converted1
Slide 25: A Potential Generational District
A POTENTIAL GENERATIONAL DISTRICT Long Section of Selected Canadian Operating Underground Mines vs. Cariboo Gold OSISKO DEVELOPMENT ALAMOS GOLD AGNICO EAGLE AGNICO EAGLE Cariboo Deposit1 Young-Davidson2 Goldex3,4 LaRonde Zone 53,5 Head Grade (Au) 3.78 g/t 2.08 g/t 1.55 g/t 3.62 g/t Gold Production 1
Slide 26: Cariboo Select High Grade Drill Results
CARIBOO SELECT HIGH GRADE DRILL RESULTS High-grade intercepts are consistently present throughout the entire deposit >50 g/t Au 25 – 50 g/t Au 15 – 25 g/t Au IM-19-013 BM-19-105 5 – 15 g/t Au 19.34 g/t over 20.66 g/t over IM-21-024 17.9 m4 12.8 m13 35.25 g/t over 346 gxm BGM-16-451 264 gxm IM-17-151
Slide 27: Adjacent Prospects: Williams Creek to Proserpine
ADJACENT PROSPECTS: WILLIAMS CREEK TO PROSERPINE › Directly southwest of the Cariboo Gold Project is a series of prospects delineated by soil sample geochemical anomalies › Drilling on Proserpine Mountain in 2019 (2,675 meters in 6 holes) intersected 17.78 Cariboo g/t Au over 5.60 meters including 1
Slide 28: Developing a Mining Camp
DEVELOPING A MINING CAMP Cariboo hosts two main trends over 83 km in combined strike length District-scale exploration upside in under-explored Cariboo Gold Belt High degree of confidence in geological model with anomalous gold values >2.0 g/t Au in ~80% of drill holes >185,000 ha property wit
Slide 29: Tintic Project
TINTIC PROJECT Utah, USA 100% Ownership Double Tap Gesture with solid fill ODV NYSE TSXV 29 Virtual Tour osiskodev.com
Slide 30: Tintic Project: Asset Snapshot
TINTIC PROJECT: ASSET SNAPSHOT Highly Productive Historical Mining District LOCATION / OWNERSHIP MINE TYPE METALS STAGE LAND PACKAGE 100% ODV Utah, USA Underground Gold, Silver Trixie MRE >20,500 acres of (Q1 2024) Cu, Pb, Zn largely patented claims1 North Lily Located 95 km south of Salt Lake Cit
Slide 31: Trixie Initial Mineral Resource Estimate
TRIXIE INITIAL MINERAL RESOURCE ESTIMATE ("MRE")1 RESOURCE TONNES METAL GRADE CONTAINED METAL CUT-OFF GRADE Resources (koz) Grade (g/t Au) CATEGORY (000’s) VARIATION (g/t Au) (g/t Ag) (000’s oz Au) (000’s oz Ag) 27.6 MEASURED 120 27.36 61.73 105 238 24.0 19.1 M&I RESOURCES INDICATED 125 11.17 59.89
Slide 32: Trixie UG Ramp Development: 100% Complete
TRIXIE UG RAMP DEVELOPMENT: 100% COMPLETE RAMP DEVELOPMENT: ~1,390 M (4,550 ft.) 3 Historic Mineralized Zones Open at Depth and Strike Complete as of September 2023 756 ORE SHOOT 610 ORE SHOOT SOUTH SURVEY VEIN Enables bulk extraction at higher tonnage by providing Developed over 900 ft. (275
Slide 33: Trixie Exploration Potential
TRIXIE EXPLORATION POTENTIAL 2024 Trixie MRE represents a small footprint of the overall underground potential SOUTH NORTH Trixie MRE 2024 TRIXIE MRE1 440 meter strike length 60 meter width Empire State 195 meter depth building for scale (~4 football fields) Looking East 1. Refer to the full t
Slide 34: Drilling and Chip Sampling Highlights
DRILLING AND CHIP SAMPLING HIGHLIGHTS Completed a total of 6,028 m (19,776 ft) of Trixie exploration and delineation drilling in 2023 In 2023, the Company completed a total of 6,028 m Select Chip Sampling Select Drilling (19,776 ft) of underground drilling in 73 diamond drill HOLE ID WIDTH GRADE (
Slide 35: East Tintic Regional Exploration Potential
EAST TINTIC REGIONAL EXPLORATION POTENTIAL Highly prospective 5 km long corridor with 23 historic mines, extensive legacy datasets High-Sulphidation Epithermal Au-Ag Epithermal vein / breccia systems hosted primarily within the basal Tintic Quartzite host rock, found at the Trixie, Eureka Standard a
Slide 36: Regional Targets: Epithermal Au-Ag
REGIONAL TARGETS: EPITHERMAL AU-AG Targets identified based on 3D geological modelling completed to date Eureka Standard North Lily Epithermal Au-Ag along trend NNE of Trixie North Lily operated between 1927 and 1940s Mineralization hosted in the brittle Tintic Quartzite with structural contro
Slide 37: Regional Targets: Carbonate Replacement Ag-Pb-Zn
REGIONAL TARGETS: CARBONATE REPLACEMENT AG-PB-ZN Historic Burgin Mine Mined by Kennecott until 1978, with the “Burgin Extension” discovered from drilling undertaken in 1980 The Burgin mine hosts a significant Pb-Zn-Ag-Au replacement style deposit Ball Park target (Zn-Pb) is located 5000 ft. (1
Slide 38: Regional Targets: Porphyry Cu-Au-Mo Potential
REGIONAL TARGETS: PORPHYRY CU-AU-MO POTENTIAL Big Hill Porphyry Target Located 65 km south of Bingham Canyon Mine operated by Rio Tinto since 1906 − To date produced over ~25 MT copper, ~1.5 MT molly, ~43 Moz gold, and ~425 Moz silver1 Indicator clay assemblages and elevated Mo and/or Cu geochem
Slide 39: San Antonio Project
SAN ANTONIO PROJECT Sonora, Mexico 100% Ownership ODV NYSE TSXV 39 osiskodev.com
Slide 40: San Antonio Project: Asset Snapshot
SAN ANTONIO PROJECT: ASSET SNAPSHOT Asset Highlights Sonora Located 160 km from airport and towns of Hermosillo and Obregon in mining-friendly Sonora Constructed a heap leach pad and a carbon in column plant at the end of 2021 to process stockpiled mineralized material − 1.1 Mt stockpile grading
Slide 41: Appendix
APPENDIX ODV NYSE TSXV 41 osiskodev.com
Slide 42: World-Class Leadership
WORLD-CLASS LEADERSHIP SEAN ROOSEN, CHAIR & CEO DAVID ROULEAU, VICE PRESIDENT, PROJECT DEVELOPMENT BOARD OF DIRECTORS • Founding member of Osisko Mining Corporation (2003-2014) • Seasoned executive with +35 years of operational and management • Responsible for developing the strategic plan for the d
Slide 43: Best in Class ESG
BEST IN CLASS ESG Committed to responsible mining practices, strong relationships, and mutual support with all partners ENVIRONMENT INDIGENOUS NATIONS ▪ Osisko Development constructed two water treatment ▪ Positive relationship with Lhtako Dené Nation since 2015. plants to treat contact water and ef
Slide 44: Cariboo Mineral Reserves & Resources
CARIBOO MINERAL RESERVES & RESOURCES (Measured and Indicated Resources are exclusive of Reserves) MINERAL RESOURCES MEASURED INDICATED MEASURED & INDICATED INFERRED Tonnes Grade Ounces Tonnes Grade Ounces Tonnes Grade Ounces Tonnes Grade Ounces Deposit (000’s) (g/t) (000’s) (000’s) (g/t) (000’s) (00
Slide 45: San Antonio Mineral Resources
SAN ANTONIO MINERAL RESOURCES TONNES GRADE (g/t) CONTAINED METAL DEPOSIT CATEGORY (Mt) SILVER GOLD SILVER (Moz) GOLD (koz) Indicated 3.9 2.5 1.22 0.31 153 CALIFORNIA Inferred 1.6 3.3 1.10 0.17 58 Indicated 5.7 2.5 1.44 0.46 262 GOLFO DE ORO Inferred 6.4 2.5 1.24 0.52 254 Indicated – – – – – HIGH LIF
Slide 46: 2024 Trixie Mineral Resources Estimate
2024 TRIXIE MINERAL RESOURCES ESTIMATE GRADE CONTAINED GRADE CONTAINED DOMAIN CATEGORY TONNES (AU G/T) GOLD (OZ) (AG G/T) SILVER (OZ) Measured 22,678 106.27 77,484 115.99 84,572 Indicated 11,939 23.19 8,902 51.07 19,602 T2 M+I 34,617 77.62 86,387 93.60 104,173 Inferred 1,996 9.82 630 61.38 3,938 Mea
Slide 47: Investor Relations Contact
PHILIP RABENOK, VICE PRESIDENT, INVESTOR RELATIONS prabenok@osiskodev.com | +1 (437) 423 3644 ODV NYSE TSXV | osiskodev.com