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1 3-D Model (Looking SW) 275 m depth produced 2.4 m oz2 Rapid Discovery and Path to Development at a World Class Gold Project in Guyana OMG TSX.V: OMG | OTCQB: OMGGF September 2025
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2 Lorem Ipsum Dolor 95 + Forward-looking Statement and Technical Disclosure This presentation contains “forward-looking statements” within the meaning of applicable Canadian securities legislation. Forward- looking statements include, but are not limited to, statements with respect to the future price of gold, copper and other minerals and metals, the estimation of mineral reserves and resources, the timing and amount of estimated future production, costs of production, capital expenditures, costs and timing of the development of new deposits, success of exploration activities, permitting time lines, currency exchange rate fluctuations, requirements for additional capital, government regulation of mining operations, environmental risks, unanticipated reclamation expenses, title disputes or claims and limitations on insurance coverage. Generally, these forward- looking statements can be identified by the use of forward-looking terminology such as “plans”, “expects” or “does not expect”, “is expected”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates” or “does not anticipate”, or “believes”, or variations of such words and phrases or state that certain actions, events or results “may”, “could”, “would”, “might” or “will be taken”, “occur” or “be achieved”. Further, the Mineral Resource Estimate and Preliminary Economic Assessments and related data set out in this news release are estimates, and no assurance can be given that the anticipated tonnages and grades will be achieved or that the indicated level of recovery will be realized. Forward-looking statements are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of Omai Gold Mines Corp. to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: risks related to international operations; actual results of current exploration activities; conclusions of economic evaluations; changes in project parameters as plans continue to be refined; future prices of gold, copper and other minerals and metals; general market conditions; possible variations in ore reserves, grade or recovery rates; failure of plant, equipment or processes to operate as anticipated; accidents, labour disputes and other risks of the mining industry; uncertainty of access to additional capital; delays in obtaining governmental approvals or in the completion of development or construction activities. 1. The Company announced an updated Mineral Resource Estimate in a news release dated February 8, 2024 and a PEA on April 8, 2024 with a NI 43-101 Technical report filed on SEDARplus.ca on May 4, 2024. 2. Past production at the Omai Mine (1993-2005) is summarized in several Cambior Inc. documents available on SEDARplus.ca, including March 31, 2006 AIF and news release August 3, 2006. Cautionary Language Regarding Exploration Targets This presentation contains estimates of exploration targets on the Omai property. The quantity and grade potential of these exploration targets are estimates based on an understanding of the geology and controls on mineralization and the available volume of potential mineralization. This draws on production records, the understanding of the current mineral resource estimate, drilling, and geological interpretation. The potential quantity and grade of the exploration targets are conceptual in nature. There has been insufficient exploration to define these as a mineral resource and it is uncertain if further exploration will result in the target being delineated as a mineral resource.
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3 3-D Model (Looking SW) 275 m depth produced 2.4 m oz2 produced 1.4 m oz2 3 Major Mining Camp in the Guiana Shield • 4.4 Moz Inferred @1.95 g/t Au in 31.9Mt • 2.1m oz Indicated @2.07 g/t Au in 69.6Mt • 96% increase to Wenot gold Resources • >10 million oz new MRE + Past Production • Two adjacent orogenic gold deposits • Wenot O/P – regional shear-hosted • Gilt Creek UG – intrusion hosted 7.0 6.0 New Mineral Resource Aug 25, 2025
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4 100% Owned, Mining-Friendly Jurisdiction • Simplest land tenure in Guyana: 3 permits directly from gov’t, Omai PL good until April 2027-2029 • Fraser Institute lists Guyana as 9th best jurisdiction for mining investment • Fastest growing GDP in world – offshore oil boom • Presidential election 2 wks ago: Incumbent re- elected with majority & in parliament • Government wants large-scale mine development • Gov’t & Communities pro redevelopment of Omai Drilling with Four Rigs • Drilled over 25,000m in 2025 and additional 15,000 planned before yr end: • Wenot: PEA optimization, resource expansion • Nearby exploration targets for satellite pits • Testing Wenot deep blue sky (1850m currently) • Updated PEA mine plan larger to incorporate Gilt Creek underground + much expanded Wenot superpit • PEA components well underway (tailings, u/g mine plan, met work) Brownfields Advantage • Producer of 3.8m oz (1993-2005) avg 300k oz/yr • Wenot historical fresh rock reconciled at 1.67 g/t Au • Known metallurgy: 92% gold recoveries • Paved road and nearby skilled workforce • Hydropower potential, to come within 30km • Rapid, low-cost discoveries <$4.00/oz • Fast-track permitting as a brownfields site: Environmental Permit (interim) issued after public comment period on the EIA path • Two existing tailings sites • US$19 million • Updated PEA for early Q1’26 (Expanded Wenot + Gilt Creek) • Drilling nearby gold occurrences for satellite pits • Wenot resource expansion • Deep blue sky Wenot potential Well-funded with Upcoming Catalysts Overview
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5 • Long History of gold & bauxite mining – 50,000 legal small-scale miners • Small Population <800,000 • English speaking – Culturally Caribbean; part of “Caricom” • Former British Guyana so British legal framework • NEW! Fraser Institute 9th (out of 82) globally for investment attractiveness, ahead of British Columbia, Ontario, Quebec, Manitoba, and W. Australia • Democratically elected government since independence in 1966 • GDP GROWTH – 2024 +43.6% & 2023 +38% • Offshore oil discovered in 2015; 600k bbl/day H1 2024, projected to 1.2m bbl/day by 2027 • Fueling multiple transformational infrastructure projects • Omai Gold Mine employed over 1,000 people when in production • Omai impacted GDP - it was an anchor of economic prosperity for Guyana - enthusiastic support for re-development • Engagement with Senior Government and EPA supporting Omai development Guyana Venezuela Suriname French Guiana Brazil Guyana’s President Dr. Irfaan Ali said: “There are some tremendous opportunities coming in mining. Today I had a meeting with OMAI for example, they are coming back on stream in the type of numbers that you will hear announced soon… the type of logistics for transport, logistics and the spin off for the rest of the economy would be enormous,” Guyana’s Minister of Finance, Dr. Ashni Singh said: “The growth of Guyana’s gold mining industry will be further supplemented by the return of Omai Gold Mines.” Omai’s CEO Elaine Ellingham with Guyana’s newly re-elected President Irfaan Ali Government is Pro-Mine Development Particularly for Omai Omai’s CEO Ellingham, lead Director Macpherson with Guyana’s Minister of Natural Resources V. Bharrat, Minister Benn & Asst Mines Commissioner Reece GUYANA: Top Ten in Global Mining Jurisdictions
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6 Essequibo River Wenot pit • Road access to 2 largest towns in Guyana • Georgetown (capital) ~165km • Linden ~ 100km • 4 hr drive/ 40 min flight to site • Existing tailings facilities & cleared site Cleared site and large revamped buildings make an efficient worksite Road widening and paving underway to within 10 km of Omai 1 km long airstrip on-site • Road Access within 10km of site (paved by year end) • Skilled workforce in Linden 80km from Omai • Approved hydropower line to within 30km awaits financing 350 Acre Tailings Facility with excess capacity, configured for dam raises plus convenient alternative old pit Paved road to Linden (~1 hr) Upgrading & paving underway Road to Brazil • Second largest town in Guyana • Open pit Bauxite mine since 1916 OMAI Junction Road Access & Brownfield Advantages
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7 Wenot -> multiple subparallel near-vertical gold zones • Wenot Shear Corridor: deformation across >7 km, centered on contact between metavolcanic rocks and metasedimentary rocks • Wenot – Multiple near vertical gold zones across up to a 450m width • Multiple expansion and exploration targets: strike extensions, depth extensions, geophysics, old artisanal workings, high grade trenches • Wenot corresponds to a strong magnetic high • Gilt Creek intrusion-hosted deposit is magnetic low Gilt Creek Deposit Wenot Deposit Current Drilling Omai: A Large Gold Camp with Significant Upside
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8 WENOT West Wenot potential starter pit 2025 MRE Constraining pit outline 3.16gpt/68.7m 2.26gpt/70.0m 4.57gpt/45.5m 2.32gpt/19.8m 5.86gpt/13.0m 5.18gpt/20.2m 2025 Resource Blocks 2.13gpt/48.5m 16.35gpt/10.5m 31.7gpt/7.5m 2.63gpt/27.5m 2.64gpt/41.8m -4.48gpt/57.0m 9.81gpt/2.5m • Near-Surface: 60% of the new Wenot MRE is above 350m depth • Significant unmined zones even at -75m level • Small old pit: historically selective mining due to gold price <$400/oz and < $300/oz • Zones unmined along strike and on flanks • West Wenot potential “starter pit” >1moz • 2024-25 deeper drilling discovered increased grade and width • Selectively-mined “dike corridor” with very robust: e.g. 4.5 g/t Au over 57m; 3.16 g/t over 68.7m • Sediment-hosted zones unrecognized in previous mining (will reduced strip) • More to drill: each hole from the south has potential to expand resource, reduce strip & upgrade inferred Up to 450m wide 2025 Resource Estimate Block Model Large Footprint: Multiple Zones Extending to Depth
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9 WENOT Hole 24ODD-086 o 2.96 g/t Au over 19.4m o 3.78 g/t Au over 10.5m Hole 24ODD-078 o 2 . 20 g/t Au over 43 . 7 m o 3 . 13 g/t Au over 43 . 0 m Hole 24ODD-092 o 4.48 g/t Au over 57.0m i ncl. 21.13 g/t over 10.0m Hole 25ODD-102 o 28.04 g/t Au over 9.3m o 8.98 g/t Au over 5.0m Long section looking north Hole 25ODD-119 o 31.70 g/t Au over 7.5m o 1.61 g/t Au over 36.4m o 3.89 g/t Au over 13.2m Hole 25ODD-124 o 2.64 g/t Au over 41.8m o 3.49 g/t Au over 17.4m o 3.89 g/t Au over 13.2m Hole 25ODD-101 o 16.35 g/t Au over 10.5m o 2.13 g/t Au over 48.5m o 3.83 g/t Au over 18.8m Hole 25ODD-116 o 2.63 g/t Au over 27.5m Hole 25ODD-113 o 5.47 g/t Au over 9.7m Hole 25ODD-107 o 2.67 g/t Au over 21.4m o 2.31 g/t Au over 24.6m Hole 24ODD-085 o 3.16 g/t Au over 68.7m Hole 24ODD-087 o 4 . 57 g/t Au over 45 . 5 m 2024 PEA pit outline 2024 Feb Resource – 30,000m subsequently drilled 0 200,000 400,000 600,000 800,000 1,000,0001,200,0001,400,0001,600,000 +50 to -50m -50 to -150m -150 to -250m -250 to -350m -350 to -450m Below -450m 177koz 1.27 g/t 833 koz 1.41 g/t 1,420 koz 1.77 g/t 1,350 koz 1.78 g/t 912 koz 1.92 g/t 72 koz 2.13 g/t Wenot Deposit by 100m depth slices -50m -150m -250m -350m -450m • >1.3m oz per vertical 100m where most drilled and these levels still open along strike • Higher grades and widths at depth could support underground mining alternative Depth Grades & Widths Increase with Depth
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10 WENOT 2024 PEA Pit Longitudinal Sections (Each 50m wide - looking North) Four Main Gold Zones • Four main gold zones across up to 400m wide deformation corridor • Each zone hosts very significant gold mineralization • Since 2024 PEA over 30,000m drilling has extended mineralization on every zone to new depths • Updated PEA will incorporate significant new resources • Drilling continues along strike and at depth on certain zones Cross Section (looking West) (1) (2/1) (2) (3) (3) (3) (4) (4) Multiple Vertical Zones Across Shear Corridor
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11 Long Hole 25ODD-122 A A’ 24ODD-095 • Orogenic shear-hosted Wenot gold deposit has potential for deep roots • Targeting Wenot extension at depth of 1100–1200m, ~600–700m below deepest drilling of Wenot to date • Drill hole 122 currently @ 1860m Sept 21st ~1860m Indicated 970,000 oz @ 1.46 g/t Au Inferred 3,717,000 oz @ 1.82 g/t Au A A’ Testing the Blue-Sky Depth Potential of Wenot
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12 GILT CREEK Open at depth Deepest hole to -967m & mineralized • Shallow: 80% of resource is between 300- 600m depth • Large Footprint: 500m x 275m “cylindrical” • High endowment: 4,600 oz per vertical m from -300m to -600m • Good grades: Average 3.3 g/t Au @ 1.5 g/t cutoff or 5.2 g/t @ 2.75 g/t cutoff (still >1moz) • Well drilled: 2/3 of MRE is “Indicated” • Compact: 500m x 275m, minimizes need for costly lateral mine development • Depth Potential: likely 2+ km depth potential; hole to 967m depth still with mineralization • Timing Optionality: separate from Wenot open pit, timing not dependent on open pit • Robust Mineralization: 41% of all core drilled assayed >0.5g/t Au Top View Side View Quartz Diorite Intrusive Stock 275m Produced 2.4m oz Category GILT CREEK UNDERGROUND Tonnes kt Grade g/t Au Contained koz Au Indicated 11,123 3.22 1,151 Inferred 6,186 3.34 665 Adjacent Intrusion-Hosted Deposit – Underground
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13 GILT CREEK GILT CREEK Average 4,600 oz per vertical metre Potential for Expansion at Depth with additional drilling 0 10 20 30 40 50 0 2,000 4,000 6,000 8,000 10,000 -300m -350m -400m -450m -500m -550m -600m -650m -700m -750m -800m -850m Indicated Inferred #DDH Intercepts Ounces per Vertical Meter At a 400m depth gold ~9,000 oz per vertical meter 1.1m oz Robust Deposit Open at Depth and Laterally
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14 Exceeded our 2025 Goal on Resource Expansion • 96% increase to Wenot open pit NI 43-101 Resource Accelerating towards Updated Preliminary Economic Study • Wenot Drilling to optimize PEA, drilling gaps within deposit • Gilt Creek engineering - ramp and mine design • Tailings assessment & plan (two existing facilities) • Focused metallurgical test work (historical 92% recoveries, 32% grav) • Advancing Permitting • Environmental Permit granted Nov 2024 (2 yr interim) • EIA application for Brownfields project submitted Four Diamond Drill Rigs Working • Limits of Wenot deposit all open “how big is it?” …not done yet • Undrilled areas to reduce PEA pit strip (convert waste to ore) & infill • Wenot East extensions along strike and depth are priorities • Wenot West (starter pit) more shallow drilling and test for western limit • At & near surface gold occurrences – possible satellite pits • Blue sky depth potential 600m below Wenot – currently drilling NEAR - TERM CATALYSTS Ongoing drill results & Deep Wenot Potential Exploration Targets & Wenot Expansion drilling Late 2025 Upsized PEA for Wenot ‘Superpit’ and Gilt Creek U/G Current Programs
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15 Wenot Exploration Expansion Target Gilt Creek U/G Target Wenot Expansion Target Plus Gilt Creek U/G Mine Life 13 years 15 - 20 yrs Plant Throughput 9,000 tpd 11,500 - 12,000 tpd 2,500 - 3,000 tpd 14,000 - 15,000 tpd Total Gold Production 1.84 m oz Avg Annual Gold Production 141,000 oz/yr 175,000 - 190,000 oz/yr 75,000 - 95,000 oz/yr 250,000 - 300,000 oz/yr Initial CAPEX US$375 million Sustaining CAPEX US$171.6 million LOM After-tax Cash Flow US$1,068 million AISC US$1,009 /oz After-tax NPV5% (@$1,950/oz Au) US$556.4 million After-tax IRR 19.80% After-tax Payback Period 4.3 years Expanded Wenot Superpit Gilt Creek Underground Expanded Wenot + Gilt Creek Underground Baseline Wenot PEA (only 45% Resources) Updated PEA Target (est. Q4 2025) Deposit Included Wenot Open Pit *Included in the 2024 NI 43-101 Mineral Resource Estimate (MRE) **Exploration target, see cautionary statement • 2024 PEA included only 45% of Omai NI43-101 gold Resources and only one of the two deposits • Project has potential for much larger mine plan with inclusion of the second deposit (Gilt Creek) and an expanded Wenot resource Wenot Open Pit @ $1,950/oz gold Baseline Wenot PEA (only 45% Resources) April 2024 Significantly Expanding Mine Plan
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16 Community Engagement Baseline Environmental Studies Metallurgical testwork (selective, building on historical) Rock Mechanics: Downhole Televiewer Data Collection and Analysis Updated Preliminary Economic Assessment (PEA) Gilt Creek ramp & underground mine design Tailings Assessment & Development & Refurbishment Plan EIA Advancing Key Components for Updated PEA
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17 JAMIE SPRATT BUY C$2.25 DON MCLEAN BUY C$1.60 COLE MCGILL BUY C$1.40 MICHAEL GREY -- -- BEN PIRIE -- -- Capital Structure Source: Capital IQ, Company filings, Street Research Share Price Performance (Last 12 Months) Shareholders Analyst CoverageSilvercorp 6% Management 2% Institutional and HNW 50% Retail 42% Select Institutions Mackenzie Franklin Templeton Van Eck Rothschild IG Investment Schroder US Global Phoenix Sun Orimco Corporate Snapshot
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18 Elaine Ellingham President & CEO, and Executive Chairman Over 30 years of mining industry experience in exploration, production, corporate development and numerous Board & executive roles. National Leader, Mining at TSX for 8 years. At Richmont Mines Inc., acted as lead director for 7 years, stepped in as interim CEO, introducing a new chapter for the gold producer, and remained on the Board through to the successful near-billion- dollar acquisition by Alamos. Current Director at Alamos, previously at Wallbridge Mining and Aurania Resources. Significant capital markets and M&A experience P.Geo, MBA, M.Sc Jason Brewster VP Operations Mr. Brewster is a mining engineer with over 25 years experience in the mining industry. He has been with Omai Gold since it went public in 2020 and was previously President & CEO of its predecessor Anconia Resources. His experience ranges from grassroots exploration through to mining operations, including international experience in Cuba, Morocco, Brazil and Spain. Mr. Brewster has led both exploration and mine development teams including on the development of the initial mine plan at the Aguas Tenidas mine in southern Spain that was brought back into production and is still in production. He has a an M.Sc in Mining Engineering from the Camborne School of Mines in the U.K. Petra Decher CFO & Corporate Secretary Ms. Decher is a seasoned finance executive with over twenty-five years' experience in the mining industry. She has a deep understanding of financial reporting, corporate governance, M&A, capital markets, compliance and ESG. Ms. Decher has held the CFO position for deveral publicly-listed exploration/development and producing mining companies and has served as an independent board member, chairing Audit Committees, being the Lead Independent Director, and a member of compensation committees. She most recently was the CFO of Marimaca Copper Corp. Prior to Marimaca, Ms. Decher was the Vice President, Finance and Assistant Secretary for Franco-Nevada Corporation. Ms. Decher is a Chartered Professional Accountant. MANAGEMENT BOARD OF DIRECTORS Derek Macpherson Lead Director Ten years of capital markets experience in mining, identifying investment opportunities, consulting on business strategy, and raising money for junior mining companies. Most recently as a mining executive and director, with prior experience as a Mining Analyst and Investment Banker at both boutique and bank-owned investment dealers. Derek started as a metallurgist and is of Guyanese descent. He is currently Executive Chairman of West Point Gold Corp. (formerly Gold79 Mines Ltd.) and was previously President and CEO of Gold79 Mines Ltd. He holds the position of Executive Chairman of Olive Resource Capital Inc. Lon Shaver Director Over 25 years of capital markets and corporate finance experience. Currently President at Silvercorp Metals. Held investment banking roles with Raymond James and Merrill Lynch. B.Comm. degree with a major in finance, and CFA charterholder. Drew Anwyl Director Mr. Anwyl is a mining engineer with over 25 years of international experience in operations startup, construction, and project management of both open pit and underground mines. He is currently Chief Operating Officer of Mayfair Gold Corp. Mr. Anwyll previously held the positions of COO at Generation Mining Limited, and Senior Vice President, Technical Services at Detour Gold Corporation, where he led the strategic work associated with long term planning, exploration, technical and operational oversight of the large Detour Lake gold mine. Prior to this role, he was VP Operations and Mine General Manager at Detour during the construction and start-up of the mine. He holds a Bachelor’s and a Master’s degree of Engineering from McGill University. Don Dudek Director Geologist with over 40 years of experience in numerous executive and technical roles, including five M&A transactions. Don has significant experience in West African gold exploration. He currently serves as Chief Exploration Officer for Allied Gold Limited. He served as President and CEO of Savary Gold Corp., which was sold to Semafo Inc. in 2019 and held senior roles with Endeavour Mining Corp., Avion Gold Corp., Aur Resources, Desert Gold Ventures and Wolfden Resources Corp. Nadine Miller Director Former Vice President JDS Engineering. Former Director of Wesdome Gold Mines and a Strategic Advisor at Awz Ventures, a venture capital fund. A professional engineer in design and project management in mining and transportation. Management & Board
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19 Enterprise Value / Oz Global Gold Resources (US$/oz) Price / Analyst Consensus NAV (x) $213 $180 $163 $115 $114 $71 $67 $55 $40 $28 Rupert Resources G2 GoldFields Amex Exploration Prime Mining Reunion (at takeout) Newcore Gold OMAI Thesis Gold Probe Gold Canagold Source: Capital IQ, Company filings, Street Research 0.5x 0.5x 0.5x 0.4x 0.4x 0.3x 0.3x 0.2x 0.2x G2 GoldFields Reunion (at takeout) Rupert Resources Amex Exploration Newcore Gold Prime Mining Probe Gold OMAI Thesis Gold Omai Comparable Trading vs. Peers
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20 ELAINE ELLINGHAM President & CEO elaine@omaigoldmines.com JASON BREWSTER VP, Operations jbrewster@omaigoldmines.com CONTACT US