Iamgold Corporation · TSX:IMG
Iamgold — Corporate Update (June 2026)
52 slides from Iamgold's corporate update, June 2026
Slide 1: Côté Gold Mine Investor Tour
CÔTÉ GOLD MINE INVESTOR TOUR June 2026 1
Slide 2: Cautionary Statement
CAUTIONARY STATEMENT All information included or incorporated by reference in this presentation, including any information as to the Company’s vision, strategy, future financial or operating performance and other statements that express management’s expectations or estimates of future performance or
Slide 3: Cautionary Statement
CAUTIONARY STATEMENT CAUTIONARY NOTE TO U .S . INVESTORS REGARDING DISCLOSURE OF MINERAL RESERVE AND MINERAL RESOURCE ESTIMATES The mineral resource and reserve estimates contained in this presentation have been prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Min
Slide 4: IAMGOLD & Côté Gold Team
IAMGOLD & CÔTÉ GOLD TEAM Renaud Adams • 30+ years of experience in global mining Maarten Theunissen • Chartered Accountant with 18+ years of President & CEO experience in senior executive positions and CFO experience in the mining industry, including (With IMG since 2023) mining operations located i
Slide 5: Operations Overview
OPERATIONS OVERVIEW Operating Advanced Exploration CÔTÉ GOLD1 Ontario, Canada (70% IMG | 30% SMM1) NELLIGAN MINING COMPLEX5 Start-up 2024 Quebec, Canada (100% IMG) Mine type Open pit Estimated mine life ~2041+ Status Pre-production (70%) 270,000 – 310,000 oz Deposit type Open pit/Sat. UG (100%) 390,
Slide 6: Côté Gold Mine
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Slide 7: Côté Gold Highlights
CÔTÉ GOLD HIGHLIGHTS One of Canada’s largest gold mines A flagship long-life operation in a top-tier mining jurisdiction 20M+ Ounces Resource Base Current Mineral Resources of 20.3 Moz M&I and 3.5 Moz Inf. with expansion potential >$580M Attributable Free Cash Flow in 2026 Operations expected to imp
Slide 8: Côté Gold
C Ô T É GOLD Ownership: 70:30 IAMGOLD & SMM Location: Ontario – 125 km SW of Timmins, 175 km N of Sudbury Acquisition: • Acquired in April 2012 for $505 M from Trelawney Mining • Mineral Resources: 0.9 Moz Indicated and 5.9 Moz Inferred • Sumitomo acquired 30% undivided participating interest for $1
Slide 9: Côté Gold: Large-Scale and Long-Life Mine
C Ô T É GOLD: LARGE -SCALE AND LONG -LIFE MINE Mines acquired in last 15 years TOP 12 GOLD MINES IN CANADA BY PRODUCTION1 M&I Mineral Resources 2 (inclusive of reserves) (koz ) 715 36 590 485 3 4 440 438 4 390 340 18 300 280 240 230 13 215 12 8 6 6 5 4 3 1 3 Detour Lake Malartic Meadowbank Côté Gold
Slide 10: Q1 2026 Operating Results
Q1 2026 OPERATING RESULTS 2026 (100% basis, unless otherwise stated) Q1 2026 Q1 2025 2025 Guidance Q1 OVERVIEW Ore mined kt 3,553 3,115 14,640 • Production (70%): 52,300 oz | (100%): 74,700 oz Grade mined g/t 0.99 0.78 0.94 MINING Material mined – total kt 9,326 10,755 45,108 ~52,000 • Total tonnes
Slide 11: Q1 2026 Cost & Outlook
Q1 2026 COST & OUTLOOK OUTLOOK COSTS Attr . 2025 2026 Guidance • Cash costs1 (excluding royalties) of $1,369/oz, cash costs1 of $1,704/oz (100%) 399,800 390,000 – 440,000 & AISC1 of $2,109/oz in Q1 Production oz (70%) 279,900 270,000 – 310,000 • Mining and processing cost improvement plan: Cash cost
Slide 12: Site Tour Agenda
SITE TOUR AGENDA TIME EVENT 05:45 Bus departure – boxed breakfast on the bus 08:00 Arrival at Côté, PPE pick-up, safety induction at PCC Tour * Open Pit IOC Control Room 08:30 – Truck Shop Processing Plant 11:30 TMF 11:30 Remove PPE at Main Camp 12:30 Lunch at Main Camp 13:00 Depart for Timmins
Slide 13: Site layout map
Oshki Lake Overburden Stockpile Mine Rock Area Côté Lake Open Pit Clam Lake Primary & Little Clam Secondary Lake Crusher Processing Plant Ore Stockpiles Geoplex Truck Shop Office Complex NORTH
Slide 14: Tailings Management Facility site layout
Tailings Management Facility Clam Lake Little Clam Lake Processing Plant Assay Lab Bagsverd Lake Primary & Office Complex Secondary Crusher Open Pit Truck Shop NORTH
Slide 15: Life of Mine to Date Operating Results
LIFE OF MINE TO DATE OPERATING RESULTS MINING & STRIP RATIO THROUGHPUT & GRADE 12 3.0 3.0 1.50 2.5 1.25 8 2.0 2.0 1.00 M tonnes M tonnes Strip ratio g/t 1.5 0.75 4 1.0 1.0 0.50 0.5 0.25 0 0.0 0.0 0.00 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/25 Q1/26 Q1/24 Q2/24 Q3/24 Q4/24 Q1/25 Q2/25 Q3/25 Q4/
Slide 16: Cost Categories
COST CATEGORIES Mining 1 Milling 1 G&A 1 Maintenance Contractor - Other Other and Supplies Insurance Energy Costs G&A, Rentals 5% Energy Costs 4% Crushing 6% 3% Maintenance 4% 4% 7% 17% and Supplies Consumable 25% Consulting Costs Fees Labour Costs 13% 5% 11% Contractor - G&A Costs Maintenance 6% Co
Slide 17: Consolidated Resource
CONSOLIDATED RESOURCE • Updated Mineral Resource estimate reflects integration of the Côté and Gosselin zones into a consolidated block model • Incorporated interconnecting saddle area between Côté and Gosselin • Gold price of $2,500 per ounce (up from $2,100/oz for Côté and $2,500/oz for Gosselin)
Slide 18: Consolidated Resource
CONSOLIDATED RESOURCE CÔTÉ ZONE - MINERAL RESERVE ESTIMATE CÔTÉ & GOSSELIN CONSOLIDATED MINERAL RESOURCE ESTIMATE Tonnes Grade Ounces Tonnes Grade Ounces (as of Dec 31, 2025) (000’s) (g/t) (000’s) (as of Mar 31, 2026) (000’s) (g/t) (000’s) Proven & Probable: Côté 217,167 1.01 7,041 Measured 164,364
Slide 19: Côté Expansion Opportunity
CÔTÉ EXPANSION OPPORTUNITY INCREASED SCOPE AND SCALE CONCEPTUAL DIAGRAM OF CÔTÉ AND GOSSELIN PITS • Expansion technical report and mine plan to be released in Q4 2026 • Conceptual plan to expand Côté plant from 36,000 tpd to 50,000+ tpd targeting subset of consolidated Côté and Gosselin model with M
Slide 20: Reconciliation
RECONCILIATION 2025 Last 6-months F1 F1.5 F2 Factor Tonnes Grade Ounces Factor Tonnes Grade Ounces F1 -3% -5% -8% F1 -2% -7% -9% Reserves Final F1.5 6% -2% 5% F1.5 5% 0% 6% Production Mill Feed Model Design F2 -3% 6% 3% F2 -2% 8% 6% F3 F3 1% -1% -1% F3 1% 1% 2% EXCELLENT RECONCILIATION BETWEEN GEOLO
Slide 21: Overview of Operations
OVERVIEW OF OPERATIONS Mining progress: Over 111 MT of rock mined, with 33MT of 1 ore and 78Mt of Waste. Over 1,591km of drilling, and 35,144,000 kg of explosives Tailings 5 blasted. 6 Management Processing 4 Sequence Update: Facility Plant Polishing Mining started at 382mL and Ore 7 progressed to 2
Slide 22: Mining
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Slide 23: Autonomous Operations
AUTONOMOUS OPERATIONS AUTONOMOUS EQUIPMENT Côté Gold utilizes autonomous haulage and drilling with primary equipment: • 20 autonomous CAT 793F haul trucks – will have 24 by year end. • 2 CAT 6060E electric shovels • 4 CAT 994/5K front-end loaders • Viper 231 autonomous drills Autonomous fleet is con
Slide 24: Material Movement
MATERIAL MOVEMENT Phase 1 Phase 3 MINING OPERATIONS (100% basis, unless Q1 Q2 Q3 Q4 Q1 otherwise stated) 2025 2025 2025 2025 2026 Tonnes mined – Waste kt 7,789 8,638 7,585 6,574 5,773 Tonnes mined – Ore kt 3,115 3,170 3,848 4,491 3,553 Phase 2 Phase 4 Material mined – total kt 10,904 11,816 11,433 1
Slide 25: Mining Performance
MINING PERFORMANCE DRILLING 5 – Pit Vipers and 5 – D65s • Fleet availability continuing to improve with significant uplift through Q1 2026 • Additional D65 drills added to fleet to meet pre-shear requirements BLASTING • Ongoing collaborative relationship with explosives vendor for improved performan
Slide 26: Processing
PROCESSING
Slide 27: Côté Primary and Secondary Crushing Circuits
CÔTÉ PRIMARY AND SECONDARY CRUSHING CIRCUITS Lime Silo Screening Building Fire Water Systems Coarse Ore Dome Fine Ore Bin Secondary Crushers Primary Crusher HPGR 27
Slide 28: Côté Processing Plant
CÔTÉ PROCESSING PLANT Pre-leachO2 Storage & From Primary & Secondary Thickener Distribution Process Water Secondary Tank Leach Tanks(10) Crushing Cyclones 30 hrs Ball Mill Cyclones Cyanide Tailings Destruction Thickener SO2 Ball Mill Tailings Pump Verti-Mills (2) CIP Tanks (8) Refinery ADR Cyanide M
Slide 29: Côté Processing Flowsheet
CÔTÉ PROCESSING FLOWSHEET KEY COMPONENTS Dry side 1 1 Traditional primary/secondary crushing 6 • Additional secondary cone crusher commissioned Dec 2025 2 Primary conveyor CV-10 2 3 Coarse ore stockpile in covered dome 3 4 HPGR crushing in tertiary stage Two stages of grinding: 5 5 Ball mill 6 Verti
Slide 30: Processing Plant
PROCESSING PLANT RAMP UP OBSERVATIONS MILLING OPERATIONS ✓ Capacity Management: Plant demonstrated early the ability to Q1 Q2 Q3 Q4 Q1 (100% basis, unless operate at or above nameplate throughput rates, increasing otherwise stated) 2025 2025 2025 2025 2026 availability was priority Ore milled kt 2,0
Slide 31: Tailings Management Facility
TAILINGS MANAGEMENT FACILITY DESIGN • 203 Mt tailings (233 Mt design requires +5 m raise) • Updated mine plan investigating expansion potential of current facility • TMF is closed circuit with tailings water and seepage captured and re- circulated to mill • Tailings are non-acid generating rock and
Slide 32: Exploration
EXPLORATION
Slide 33: Côté District - Regional Land Holding Tenures
Côté District - Regional Land Holding Tenures Summary Mineral potential Potential for Côté-style tonalite & diorite hosted Breccia zones (Clam Lake ext. & Gosselin-Jack Rabbit ext.) North TMF Option North TMF Exploration Potential for Syenite intrusion or shear Expansion zone hosted gold zones – Mos
Slide 34: Chester Central Area – Exploration Potential
Chester Central Area – Exploration Potential North TMF Option TMF + Exp N MRA Exp. E MRA Exp. S Exploration Target Areas Potential for Côté-style tonalite & diorite hosted Breccia zones: Targets of 1st Priority - Major Gold Trend - Best potential in Côté-Gosselin Trend and Clam Lake ext. & Gosselin-
Slide 35: Gosselin Deposit ~8 Years Ago
GOSSELIN DEPOSIT ~8 YEARS AGO From the May 31st 2018, exploration weekly report 2018 • CD18-024 returned a broad 231 m of 0.62 g/t Au, indicating persistent low-grade mineralization at depth. • The intersection lies ~330m below the Young-Shannon trend, suggesting a deeper, continuous gold system. •
Slide 36: Chester Regional Exploration - Structural Corridor Theory
CHESTER REGIONAL EXPLORATION - STRUCTURAL CORRIDOR THEORY Hydrothermal breccia Jack Rabbit Diorite breccia Silica +/- albite alteration Gosselin Deposit Côté Gold Clam Lake 1. Footnote 2. Footnote 2 36 36
Slide 37: Long Section – Looking South
37 LONG SECTION – LOOKING SOUTH JACK RABBIT GOSSELIN CÔTÉ GOLD Zone No. 2 Zone No. 1 Zone No. 3 390 250 TARGET AREA Previous Diamond Drilling o Tightly clustered o Depth of testing mostly above 250m vertical o Narrow corridors of testing (<200m wide) along strike from structurally hosted high-grade
Slide 38: Priority 2026 - Change of Focus
3 Priority 2026 - Change of Focus Priority focus now outside of the mine leases Swayze (TAAC) West Move to underexplored areas of UJV property Prospective Au occurrences / depositional settings North Shore Jerome North TMF Option Jack Rabbit Watershed TMF + Exp N MRA Exp. MRA E Exp. S Expansion and
Slide 39: Swayze West Regional Exploration – Jérôme Deposit
39 SWAYZE WEST REGIONAL EXPLORATION – JÉRÔME DEPOSIT • Jérôme Au – Ag Deposit hosted in veins along structural Temiskaming Sediments / Porphyry contact on 25 km strike porphyry / sediment contact • Milled grade 5.82 g/t Au (56,878 oz and 1.55 g/t Ag). Au – Ag – Mo association. • Deposit Model : Youn
Slide 40: Responsibility and Community
RESPONSIBILITY AND COMMUNITY A sustainable and positive legacy 40
Slide 41: Health & Safety: A Core Focus
HEALTH & SAFETY: A CORE FOCUS 2024 Achievements • Updated state of the art Occupational Health Centre & Staffing • Implementation of Alcohol & Drug program site wide • Implementation of Industrial Hygiene programs 2025 Achievements • Continued to decrease injury rates (0 LTI since Oct 2024) • Functi
Slide 42: Communities
COMMUNITIES We have two Impact Benefit Agreements with Côté in the Community Indigenous partners: Sponsorships Donations Community Investments 1. First Nation Partners IBA with Mattagami Côté Gold's Community Benefits program First Nation and Flying Post First Nation, supports sustainable developmen
Slide 43: Employment
EMPLOYMENT There are currently 263 employees from Greater Sudbury + Timmins areas • Equipment Operation: 69 • Trades/Apprentices/labourer: 40 • Engineers/Specialists/Technologist: 25 • Leadership: 33 • Geology: 12 • Supply Chain: 11 • Finance: 10 • IT: 8 • Safety & Environment: 10 • HR & Communicati
Slide 44: 2025 Procurement
2025 PROCUREMENT USA, 3% Europe, 1% Other, 0.27% Southern Ontario, 15% Côté Gold 2025 Operating costs: $361 million Canada, 23% Capital expenditures: Northern Ontario, $127 million 58% 44 Procurement from September 2024 to September 2025
Slide 45: Environment
ENVIRONMENT Water Quality Monitoring •Surface Water Monitoring 432 •Lake Monitoring Surface Water Samples •Hydrometric Monitoring collected in 2025 •Potential Acid Generating (PAG) Cell Monitoring •Compliance and Due Diligence Monitoring •Groundwater Monitoring Biodiversity Monitoring 295 •Breeding
Slide 46: Fisheries Offsetting: Oshki Lake
FISHERIES OFFSETTING: OSHKI LAKE Open Pit footprint Water Ceremony Oshki Lake, June 2024 46
Slide 47: Fisheries Offsetting: Middle Three Duck Lake Extension
FISHERIES OFFSETTING: MIDDLE THREE DUCK LAKE EXTENSION ~111,610 m2 / 27 acres of newly constructed fish habitat 47
Slide 48: Appendix
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Slide 49: Gold Mineral Reserves – 100% Basis
1,2,3 GOLD MINERAL RESERVES – 100% BASIS As of December 31, 2025 PROVEN PROBABLE P+P MINERAL RESERVES Tonnes Grade Ounces Tonnes Grade Ounces Tonnes Grade Ounces DEPOSIT Type* Location Ownership (000’s) (g/t) (000’s) (000’s) (g/t) (000’s) (000’s) (g/t) (000’s) Côté Gold3 OP Canada 70% 116,055 1.05 3
Slide 50: Gold Mineral Resources – 100% Basis
1,2,3,4,5 GOLD MINERAL RESOURCES – 100% BASIS MEASURED INDICATED MEASURED + INDICATED INFERRED Location Ownership Tonnes Grade Ounces Tonnes Grade Ounces Tonnes Grade Ounces Tonnes Grade Ounces DEPOSIT Type* (000’s) (g/t) (000’s) (000’s) (g/t) (000’s) (000’s) (g/t) (000’s) (000’s) (g/t) (000’s) Côté
Slide 51: Notes
NOTES || IAMGOLD | x88 REDEFINED.
Slide 52: Graeme Jennings, VP, Business Development & IR
GRAEME JENNINGS, VP, BUSINESS DEVELOPMENT & IR 416-388-6833 TSX: IMG | NYSE: IAG | www.iamgold.com