Omai Gold Mines Corp. · TSXV:OMG
Omai Gold Mines — Investor Presentation (September 2026)
26 slides from Omai Gold Mines's investor presentation, September 2026
Slide 1: Rapid Gold Discovery and Development at Omai Project - Guyana
Rapid Gold Discovery and Development at Omai Project - Guyana TSXV: OMG OTCQB: OMGGF September, 2026 1
Slide 2: Cautionary Language Regarding Forward-looking Statements
This presentation contains statements that constitute “forward-looking information” (collectively, “forward-looking statements”) within the meaning of the applicable Canadian securities legislation. Forward-looking statements contained in this presentation include, without limitation, statements reg
Slide 3: Omai Presents a Rare Opportunity
Omai Presents a Rare Opportunity Demonstrated a Large-Scale, Long-life Mine in A Mining Friendly Jurisdiction Significant Project Size - Further Upside Track Record of Value Creation • Two large adjacent orogenic gold deposits • Completed 5 resource estimates and 2 PEAs • New PEA for 351,000 oz/yr p
Slide 4: Proven Geology and Many Benefits of a Brownfields Project
Proven Geology and Many Benefits of a Brownfields Project At the Heart of the Prolific Guiana Shield: a Classic Greenstone Belt Paved Road Access Expandable Tailing Storage Facility Well Serviced Worksite On-Site Airstrip 4
Slide 5: Central to Guyana's Rapid Infrastructure Build-out
Central to Guyana’s Rapid Infrastructure Build-out Georgetown, Guyana Georgetown NEW! Gas to Energy Plant (300 MW) Planned Berbice Deep Water Port Oko-Aremu G2 Berbice-Linden • Guyana is the fastest growing economy in Oko-West road planned the world - 2015 offshore oil discoveries GMIN Omai’s CEO wi
Slide 6: Omai Project: Two Orogenic Gold Deposits
Omai Project: Two Orogenic Gold Deposits NI 43-101 Mineral Resource Estimate 2.5 Moz Indicated @ 2.04 g/t Au 5.5 Moz Inferred @ 1.59 g/t Au Wenot Deposit 2.4 km Gilt Deposit produced 1.4 m oz Open pit: 2.4 km x 1.1 km to produced 550m 2.4 m oz Underground starts -275m Shear-hosted, multiple vertical
Slide 7: Significant Potential for Expansion: Wenot, Gilt and other Exploration Targets
Significant Potential for Expansion: Wenot, Gilt and other Exploration Targets Wenot Gilt • Within major Shear Corridor straddling lithologic contact • Within intrusive “Omai Stock”, extending into host volcanics • 21 subparallel vertical gold zones across 350-400m • Large footprint, compact, est. a
Slide 8: WENOT – High Grades for Open Pit Mining – Room to Grow
WENOT – High Grades for Open Pit Mining – Room to Grow 2.4 km ~ 700m Wenot Resources by 100m Vertical Slice Deep hole intersected aggregate of Deep 2025 hole confirms extension of Wenot 51.2m averaging 2.26 g/t Au within a shear with gold mineralization 700m below 224m interval of Wenot shear known
Slide 9: Major Milestone Achieved Preliminary Economic Assessment
Major Milestone Achieved Preliminary Economic Assessment High Gold Production: 6,327,000 ounces Avg Annual Production: 351,000 oz/yr Plant: 25,000 tpd Long Mine Life: 18 year mine life Strong Economics: US$ 4.0 B @ $3600/oz Au Cash Flow US$ 8.0 B over LOM Initial Capex $1.43 B initial Capex Economic
Slide 10: Omai Preliminary Economic Assessment
Omai Preliminary Economic Assessment 2026 PEA Major Step Up from 2024 PEA 2024 PEA 2026 PEA $1,950/oz $3,600/oz Avg. Annual Gold Production 142,000 oz 351,000 oz +148% annual production Total Gold Production 1,840,000 oz 6,327,000 oz +244% Au production Mine Life 13 yrs 18 yrs Strip Ratio (Wenot: w:
Slide 11: PEA Production Profile Supports Robust Economics
PEA Production Profile Supports Robust Economics Total Gold Production: 6.3 million oz Cash-Operating-Cost: $1,501/oz Average Annual Production: 351,000 oz AISC: $1,608/oz Peak Year Production: 436,000 oz Cumulative After Tax Cash Flow: $8.0 B Gold Production and Gold Grades from O/P and U/G Free Ca
Slide 12: Wenot Open Pit Operations Summary
WENOT OPEN PIT Operations Summary • “Superpit” 2.4 km long, 1.1 km wide, 550 m deep Gilt • 4.31 M oz Au production over 18 yrs (240koz/yr) Underground • 5.9:1 strip ratio • 21,000 tonnes per day Wenot Pit • Avg grade 1.08 g/t Au (includes 19% dilution) vs MRE grade of ~ 1.40 g/t Au • Truck-and-shove
Slide 13: Gilt Underground Mining Operations Summary
GILT UNDERGROUND MINING Operations Summary • Underground, dual ramp access from surface • 4,000 tpd (assumes yrs 2-18) • Drift-and-fill mining assumed for PEA • Average mined grade 2.98 g/t Au • 2.01 oz Au production over 16 yrs (125koz/yr) • Compact footprint minimizes development 6.55 g/t Au/25m U
Slide 14: PEA Highlights Areas to Further Enhance Economics
PEA Highlights Areas to Further Enhance Economics A Preliminary Economic Assessment does not include detailed engineering or mine scheduling, which will further boost Omai’s economics: Gold Production and Gold Grades from O/P and U/G 500 4 Initiatives to Focus on Increasing production and/or grades
Slide 15: Next Steps
Next Steps Update Mineral Resource Estimate Optimize and Expand Based on PEA • Exploration drilling - quantify near-surface resources • Drilling to convert ounces - inferred to indicated • Advance engineering design: • Re-schedule Wenot with west starter pit and • Blended Mining methods for Gilt • P
Slide 16: Significant Drilling Completed Since MRE and PEA
Significant Drilling Completed Since MRE and PEA Updated MRE Planned for Further Conversion and Expansion Multiple Gold Zones Highlight Post-MRE Assays 7.26g/t Au over 34.8m Volcanic-hosted zones (splays) 5.12 g/t Au over 40.5m Dike Corridor 8.54g/t Au over 20.6m 7 6 Central Qtz Fsp 10 1 2 5 2.68 g/
Slide 17: Advancing Key Components Towards Feasibility
Advancing Key Components Towards Feasibility Community Engagement Pit Dewatering to Work commence Q4; towards permitted, EIA Application engineered, Filed Feasibility team-in-place Baseline Environmental Studies Process Plant Flow Sheet Refinement Tailings Redevelopment & Expansion Plans Rock Mechan
Slide 18: Timelines for Next Milestones
Timelines for Next Milestones 2026 2027 2028 2029 2030 2031 PROJECT DEVELOPMENT WORK Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 PEA Exploration Drilling Ph2 - Met & Extraction Studies Infill Drilling for Feasibility Study Environmental Impact Assessment NI 43-101 Mineral Resource Updat
Slide 19: 2026 – A Catalyst-Rich Year
2026 – A Catalyst-Rich Year ▪ Updated Mineral Resource Estimate (MRE) COMPLETED ▪ Metallurgical Results (Phase 1) COMPLETED ▪ Preliminary Economic Assessment COMPLETED ▪ GDXJ Inclusion September 18th ADDED ▪ 50,000m drill program underway (5 drills) ▪ Environmental Permitting: Terms & Scope of EIA ▪
Slide 20: Omai Stands Out Among Peers
Omai Stands Out Among Peers Large-Scale – Low Risk Jurisdiction – Potential for Fast-Track to Production ➢ Among large producers: >350,000 oz/yr production All with high Note: Market data Sept 18, 2026. Project metrics based on most ➢ Large Resource: 8.0 million ounce resource potential to advanced
Slide 21: Corporate Snapshot
Corporate Snapshot Capital Structure Share Price Performance Basic Shares Outstanding 676.4 M C$3.50 Omai: +249% Warrants (M) 1.4 M C$3.00 Year to Date Options (M) 50.3 M Fully Diluted Shares Outstanding 728 M C$2.50 GDXJ +6.4% C$2.00 OMG +81% Share Price (@ Sept 18, 2026) C$2.61 GDXJ: +62% Basic Ma
Slide 22: Management & Board
Management & Board Management Board of Directors Elaine Ellingham, President & CEO, and Executive Chairman Elaine has over 30 years of mining leadership spanning exploration, Derek Macpherson production, and corporate development. Former National Leader, Mining at Lead Director TSX; Lead Director an
Slide 23: Contact Us
CONTACT US ELAINE ELLINGHAM President & CEO elaine@omaigoldmines.com JASON BREWSTER VP, Operations jbrewster@omaigoldmines.com 23
Slide 24: Omai Project PEA: Capital Costs
OMAI PROJECT PEA: CAPITAL COSTS CAPITAL COSTS Initial Capital Direct Costs OP Mine $275 Process Plant $394 Infrastructure $177 Total Direct Costs $846 Indirect Costs $296 Initial Capital (Total Direct & Indirect) $1,142 Contingency (25%) $285 Total Initial Capital $1,427 Growth Capital (Underground
Slide 25: Omai Project (PEA): Operating Costs
OMAI PROJECT (PEA): OPERATING COSTS OPERATING COST TABLE LOM (US$ Millions) PER TONNE COSTS PER OUNCE COSTS Mining Costs -- OP 3,026 22.57 701 Mining Costs -- UG 1,825 80.82 907 Combined Mining Costs 4,851 30.96 767 Processing Cost 2,251 14.37 356 G&A Cost 723 4.25 105 Total Site Costs 7,825 49.58 1
Slide 26: Omai: Largest Gold Project in Guyana
Omai: Largest Gold Project in Guyana High Potential for Expansion 26
Omai Gold Mines — Investor Presentation (September 2026) on 6ix