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www.erdene.com Q3 2026 RESULTS CONFERENCE CALL & WEBCAST NOVEMBER 5, 2026 TSX:ERD | MSE:ERDN | OTCQX:ERDCF
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2 FORWARD LOOKING STATEMENT This presentation contains certain forward-looking information and statements, including without limitation, statements regarding the Corporation's expectations in respect of its future financial position, business strategy, projected production at Bayan Khundii, the results of the Preliminary Economic Assessment(“PEA”) of the Zuun Mod Molybdenum project, including projected production, mine life, capital and operating costs, net present value and internal rate of return, the timing of future technical studies, permitting, financing and development decisions, construction and commissioning timelines, capital and operating costs, and expectations that address reserve potential, exploration drilling, exploitation activities, budgeted financial results, and events or developments that the Corporation expects to take place in the future. The results of the PEA are preliminary in nature. The PEA is based on a Mineral Resource Estimate that has not been upgraded to a Mineral Reserve and the economic analysis does not have as high a level of certainty as a Pre- Feasibility Study or Feasibility Study. The PEA includes Inferred Mineral Resources that are considered too speculative geologically to have economic considerations applied to them that would enable them to be classified as Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. There is no certainty that the PEA will be realized. Actual capital costs, operating costs, production rates, metallurgical recoveries, and project economics may differ materially from those set out in the PEA. The PEA is subject to various risks and uncertainties, including those related to commodity prices, exchange rates, capital and operating costs, permitting timelines, and the availability of financing. All statements, other than statements of historical facts, are forward-looking information and statements. The words "believe", "expect", "anticipate", "contemplate", 'target", "plan", "intends", "continue", "budget", "estimate", "may", "will" and similar expressions identify forward-looking information and statements. In addition to the forward-looking information and statements noted above, this presentation includes forward- looking statements that relate to: the expected results of exploration activities; the estimation of mineral resources; the ability to identify new mineral resources and convert mineral resources into mineral reserves; ability to raise additional capital and complete future financings; capital expenditures and costs, including forecasted costs; the ability of the Corporation to comply with environmental, safety and other regulatory requirements; future prices of precious metals; and the ability to obtain and maintain all necessary approvals and permits in connection with operation of the Bayan Khundii Gold Project. Such forward-looking information and statements are based upon a number of estimates and assumptions that, while considered reasonable by the Corporation as of the date of such information and statements, are inherently subject to significant business, economic and competitive uncertainties and contingencies. These estimates and assumptions relate to, among other things: there being no material adverse changes in commodity prices; that general business and economic conditions will not change in a material adverse manner; that third party contractors, equipment and supplies and governmental and other approvals required to conduct the Corporation's planned activities will be available on reasonable terms and in a timely manner; the continuance of the Corporation and its subsidiaries and associates as a going concern; and the accuracy of mineral resources and mineral reserve statements. Readers are cautioned that forward-looking information and statements are not guarantees of future performance. There can be no assurance that such information and statements will prove to be accurate and actual results and future events could differ materially from those presented in such information and statements. Forward-looking information and statements are subject to a variety of risks and uncertainties which could cause actual events or results to differ from those reflected in the forward-looking information and statements. These risks include: reliance on key management and other personnel; potential downturns in economic conditions; actual results of exploration and development activities being worse than anticipated; competition from others; adverse market factors, including lower demand for and prices realized from the sale of minerals; theCorporation’s expectations in connection with the exploration, development and expansion plans at the Corporation’s projects not being met; adverse changes in national and local government legislation, taxation, controls or regulations and/or changes in the administration of laws, policies and practices; fluctuating metal prices; adverse movements in currency exchange rates; higher than expected inflation; general risks of the mining industry; failure of plant, equipment or processes to operate as anticipated; unanticipated results of future studies; seasonality and unanticipated weather changes; longer than planned permitting timelines; environmental risks; unanticipated reclamation expenses; title disputes or claims; as well as those risk factors discussed or referred to in theCorporation’s most recent annual information form and other public disclosure documents filed by the Corporation available on the Corporation's website at www.erdene.com or on the Corporation's SEDAR+ profile at www.sedarplus.ca. The lists of risk factors set out in this presentation or in the Corporation’s other public disclosure documents are not exhaustive of the factors that may affect any forward-looking information of the Corporation. Should one or more of these risks and uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in forward-looking information and statements. The Corporation disclaims any intention or obligation to update or revise any forward-looking information or statements whether as a result of new information, future events or otherwise, except to the extent required by applicable laws. The Corporation has included certain non-GAAP financial measures in this presentation, such as Earnings before Interest, Taxes, Depreciation and Amortization ("EBITDA"), Initial Capital Costs, Total Cash Cost, All- In Sustaining Cost, and Effective Cash Tax Rate which are not measures recognized under GAAP and do not have a standardized meaning prescribed by GAAP. As a result, these measures may not be comparable to similar measures reported by other corporations. Each of these measures used are intended to provide additional information to the user and should not be considered in isolation or as a substitute for measures prepared in accordance with GAAP. Peter Dalton, P.Geo. (Nova Scotia), Senior Geologist for the Corporation and a "Qualified Person" under National Instrument 43-101, has reviewed and approved the scientific and technical information in this presentation. All currencies are reported in Canadian dollars unless otherwise specified.
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ERDENE’S SPEAKERS Today’s Presenters Peter Akerley President & CEO Robert Jenkins Chief Financial Officer 3
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CHINA MONGOLIA Ulaanbaatar Tavan Tolgoi Oyu Tolgoi Jiayuguan Steel making industrial centre Yinchuan Taiyuan Shijiazhuang Jinquan Industrial cent re Baotou Steel making industrialcent re 0 250kilometre Trans Altai Terrane Bayankhongor Shinejinst Dongfeng Space City Xinjiang Hami Naomaohu (Tianrun) wind farm Khan Altai Khundii MineralsDistrict Beishan Underground Research Laboratory ERDENE Projects Mines & Major Projects Major Paved Road Unpaved Road Existing Railway Planned Railway International Airport Regiona l Airport City Legend Under Construction Road BK Powerline (110kW) KHUNDII MINERALS DISTRICT – INFRASTRUCTURE DEVELOPMENT Emerging Mining District • Growing mining hub with gold, iron and coal mines in under-explored region adjacent to largest consumer • Road network being developed to access raw material including 30 km’s from the Zuun Mod Project • Railhead and border infrastructure in place • Power transmission lines connected to grid for Bayan Khundii Gold Mine • New commercial and social enterprises 4
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KHUNDII MINERALS DISTRICT– MULTIPLE HIGH-QUALITY DEPOSITS AND PROSPECTS Four Gold Discoveries, Molybdenum-copper Deposit and +20 High-Priority Targets 20 km Landsat 8 True Colour ExplorationLicense Au Cu Mo Bayan Khundii Gold Mine Ulaan Gold Discovery Altan Nar Gold Deposit N 50% INTEREST +ROYALTY 100%INTEREST Zuun Mod Moly & Copper Deposit Dark Horse Gold Discovery MiningLicense Prospect Deposit Extent of Alteration & Related Mineralization The Khundii Minerals District Arc Related Mineral Systems AN KK BK Discovered and defined multiple deposits & prospects since 2010 Three main target areas: BAYAN KHUNDII (BK) Au, Ag low sulphidation epithermal ALTAN NAR (AN) Au-Ag-Pb-Zn intermediate sulphidation KHUVYN KHAR (KK) Cu-Mo porphyry 5
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Q3 2026 HIGHLIGHTS Steady production, strong cash flow, growth underway Gold Production 11.9 koz gold 16,500m Drill Program Underway Positive Cash Flows Zuun Mod Robust PEA Large, long-life Mo-Cu Project US$30M debt repaid 6 Strong Cash Position NCIB Underway
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• Fed 164 kt ore to the plant, averaging 1,788 t/d (6% increase) • Gold recoveries of 96%, above forecast of 93% • Produced 11,853 oz gold and 3,046 oz silver • Average realized prices of US$4,313/oz gold and US$56/oz silver Q3 2026 HIGHLIGHTS Bayan Khundii– Processing Plant 1,501 1,675 1,682 1,788 1,000 1,250 1,500 1,750 2,000 Q4-2025 Q1-2026 Q2-2026 Q3-2026 Throughput (t/d) 96% 96% 96% 96% 80% 85% 90% 95% 100% Q4-2025 Q1-2026 Q2-2026 Q3-2026 Recoveries 7,434 8,527 11,709 11,853 - 3,000 6,000 9,000 12,000 Q4-2025 Q1-2026 Q2-2026 Q3-2026 Gold production (oz) 2,634 3,135 3,317 3,046 - 900 1,800 2,700 3,600 Q4-2025 Q1-2026 Q2-2026 Q3-2026 Silver production (oz) 7
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©️2021 Erdene Resource Development Corp. All rights reserved Q3 2026 HIGHLIGHTS Bayan Khundii– Mining Operations Gold Hill Zone Striker Zone Midfield Zone Looking West • Moved 4.0 Mt of material • Mined 415 Kt ore averaging 1.25 g/t Au • Delivered 164 Kt of ore at an average feed grade of 2.3 g/t Au to plant • Excavated lower grade ore to access high-grade zone for mining in Q4 • Targeting 3 g/t Au head grade by year-end 8
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©️2021 Erdene Resource Development Corp. All rights reserved KHUNDIIGOLD DISTRICT Exploration Focused on Expansion – 12,000 metre Drill Program at Bayan KhundiiWest and Dark Horse Dark Horse Target Area Ulaan Exploration License Khundii Mining License Dark Horse Fault Bayan KhundiiGold Mine Ulaan Alteration Zone (Intrusive Centre) Dark Horse Gold Deposit Khundii West Target Area Q4 2025 Drilling Resource Expansion Targets N Section Lines 1 km • Bayan Khundii hydrothermal complex remains under-explored • Exploration beyond BK is focused on Khundii West and Dark Horse • Khundii West expansion for a larger pit at BK • Dark Horse testing to expand the near- surface oxide resource for both the existing CIP plant for potential heap leach processing 9
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Section Viewing East A A B B 0.3g/t Gold Outline US$3,900/oz Au Pit Outline Planned Drilling Historical Drilling Highlights Hole From To Interval G/t Au BKD-333 130 178 48 0.3 BKD-339 129 183 54 1.1 BKD-377 106 148 42 7.3 Incl 117 118 1 50.7 Incl 121 125 4 35.8 BKD-378 103 134 31 0.4 And 178 200 22 6.1 Incl 186 187 1 106.8 Striker West 10 BAYAN KHUNDII WEST EXPANSION 9,000m Drill Program ~50% Complete – Results Expected Q1 2027
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Viewing Oblique Northwest ≥0.25 g/t AuEq Shell ≥1.0 g/t AuEq Shell Mapped Structure DARK HORSE & ALTAN ARROW EXPLORATION 3,000m Program Focused on Expansion of Shallow Resource for CIP and Potential Heap Leach 11 DH Resources Tonnage Grade Au Cont. Au Grade Ag Cont. Ag Classification (Kt) (g/t) (Koz) (g/t) (Koz) Indicated 430 4.83 67 2.4 33 Inferred 174 1.68 9 1.5 8 Resources at a 0.7 g/t Au cut-off grade, effective July 1, 2026. Further details are included in the appendix to this presentation. Dark Horse South Dark Horse North
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• Current combined resources should support over 10 years of CIP operations • 0.7g/t Au is the current reserve cut- off for Bayan Khundii ore feed to CIP plant– reserve conversions will vary by resource • Mineral production beyond 400,000 ounces of gold is subject to a 5% Net Smelter Royalty in Favour of Erdene 12 KHUNDIIGOLD DISTRICT – MINE LIFE EXTENSION POTENTIAL Combined Gold Resources Provide Path for Longer Life at Bayan Khundii Resource Classification Deposit Quantity Grade Contained Metal Kt Au (g/t) Ag (g/t) Au (Koz) Ag (Koz) Measured BK 1,208 4.49 2.0 174 76 Measured (total) 1,208 4.49 2.0 174 76 Indicated BK 1,416 4.46 2.0 203 101 Indicated DH 430 4.83 2.4 67 33 Indicated AN 4,508 2.16 15.7 313 2,275 Indicated UL 1,286 1.88 1.2 78 50 Indicated (total) 7,640 2.69 10.0 661 2,459 Measured + Indicated 8,848 2.94 9.0 835 2,535 Inferred BK 151 1.56 1.6 8 8 Inferred DH 174 1.68 1.5 9 8 Inferred AN 4,559 1.44 6.8 210 1,000 Inferred UL 607 1.95 0.9 38 18 Inferred (total) 5,492 1.50 5.9 265 1,034 1. Combined mineral resources at a 0.7 g/t gold cut -off grade effective July 1, 2026. Further details for the individual MREs can be found in the appendix to this presentation.
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Nomin Tal Cu - Au Occurrence Minimal drilling completed Oyut Khundii Copper Prospect (NOT DRILL TESTED) 3km ANT-19 1m of 4.2 g/t 1m of 3.0 g/t ANT-18 3m of 6.4 g/t ANT-21 4m of 3.1 g/t 4m of 2.4 g/t ANT-35 1m of 2.0 g/t TND-25 1m of 2.8 g/t TND-48 1m of 1.8 g/t ANT-28 4m of 3.0 g/t 5.2 g/t 11.2 g/t 2.0 g/t 2.1 g/t 3.8 g/t 1.1 g/t 5.0 g/t 2.3 g/t 3.3 g/t 11.9 g/t 3.2 g/t 1.2 g/t Drill Collar Defined Resource Zone Exploration Target Gold in Rock chip T arget Copper in Rock chip T arget Highly anomalous copper in rock chip within intense phyllic alteration zone Cu Porphyry Targets up to 14%Cu Scout Drilling Only TND-02 4m of 1.4 g/t Gold and 3.4% Copper Discoveries at Altan Nar are shallow with drilling and geophysical surveys focusing less than 200 metres from surface Mineralization at Altan Nar remains open at depth where the prospect of mineralized feeder zones, boiling horizons and expansion of resources remainshigh ALTAN NAR REGIONAL TARGETS Exploration Trenching and Drilling 13
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ZUUN MOD –ONE OF ASIA’S LARGEST UNDEVELOPED MOLY-COPPER PROJECTS Preliminary Economic Assessment Highlights – October 2026 Robust Economics After Tax NPV(8%) = $2.0B IRR = 27.8% At current prices = $33/lb Mo & $6.50/lb Cu Large-Scale, Long-Life Throughput = 25 Mtpa Mine life = 34 years Strategic Location ~280 km by road to high- demand Asian markets Nearby infrastructure Resource Upside 4,500m infill and expansion drilling commenced LOM Production Molybdenum = 672.1 Mlbs Copper = 947.2 Mlbs 14 Large Resource Base M&I 427.0 Mlbs Mo 553.7 Mlbs Cu Inferred 536.8 Mlbs Mo 733.3 Mlbs Cu Refer to slide 2 for Cautionary statements
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CHINA MONGOLIA Ulaanbaatar Tavan Tolgoi Oyu Tolgoi Jiayuguan Steel making industrial centre Yinchuan Taiyuan Shijiazhuang Jinquan Industrial cent re Baotou Steel making industrialcent re 0 250kilometre Trans Altai Terrane Bayankhongor Shinejinst Dongfeng Space City Xinjiang Hami Naomaohu (Tianrun) wind farm Khan Altai Khundii MineralsDistrict Beishan Underground Research Laboratory ERDENE Projects Mines & Major Projects Major Paved Road Unpaved Road Existing Railway Planned Railway International Airport Regional Airport City Legend Under Construction Road BK Powerline (110kW) KHUNDII MINERALS DISTRICT – INFRASTRUCTURE DEVELOPMENT Emerging Mining District • Growing mining hub with gold, iron and coal mines in under- explored region adjacent to largest consumer • Road network being developed to access raw material including 30 km from the Zuun Mod Project • Railhead and border infrastructure in place • Power transmission lines connected to grid for Bayan Khundii Gold Mine • New commercial and social enterprises 15
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STRONG DEMAND GROWTH FORECAST WITH FEW NEW MINES IN THE PIPELINE Molybdenum Market Dynamics 16 +40% year over year price increaseLME / Platts Mo Price @US$33.45/lb Source: ERD compiled, based on IMOA (2024), SMR (2021), USGS, CPM, WRI, Scotia Bank GBM, company reports • Molybdenum is designated a critical or strategic mineral by Japan, Korea, China and other countries. • Asia accounts for approximately two - thirds of global molybdenum consumption. • In China, primary moly mines are nearing end of life as steel demand shifts to higher-quality grades. • Primary use of Mo is in Specialty and Stainless Steels plus Aerospace and Defense, Oil & Gas, the global energy transition. • Mo supply deficit and growing demand supports historically strong Moly price 13 kt (est) supply deficit in 2026
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ZUUN MOD: RESOURCE EXPANSION OPPORTUNITIES 4,500-Metre Drill Program Underway to Increase Confidence and Expand Resources • Drilling near-surface targets in areas of the Zuun Mod deposit, previously modelled as waste – converting material could meaningfully impact economics in the early years • Quantec geophysical survey and drill testing copper targets Q4 • 2027 focus on upgrading Inferred resources to Measured and Indicated, starting with the zones scheduled for mining in the first five years of the mine plan • Follow-up drilling of the Khuvyn Khar copper target area following geophysical surveys in 2027 KhuvynKhar Copper Zone (3km * 1.5km) Zuun Mod Deposit (2.5km * 1km) 17
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Erdene Mongol* CAD million unless otherwise noted Q3-2026 Q2-2026 Revenue $71 $75 Price realized (US$ per oz) - Gold - Silver $4,313 $56 $4,493 $72 Sales - Gold (oz) - Silver (oz) 11,853 3,046 11,709 3,317 Cost of Sales $32 $33 Cash Costs (US$ per oz) $1,742 $1,899 AISC (US$ per oz) $1,848 $1,991 Cash $27 $56 Project Debt $132 $175 Erdene Resource Development CAD million unless otherwise noted Q3 2026 Q2 2026 Income from Associate – EM $10.6 $11.2 Operating Expenses - Exploration - Corporate $0.5 $0.7 $0.7 $0.7 Net income - per share $9.6 $0.14 $10.0 $0.15 Cash $25.3 $27.8 Normal Course Issuer Bid - Q3: 130,300 shares @ avg $5.57/share $0.7 n/a * Erdene Mongol is a 50/50 JV with MMC Q3 2026 FINANCIAL HIGHLIGHTS Financial Strength 18
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19 Supporting SMEs Education&Training • Employment orientation & professional training • Heavy equipment operator training /+160 trainees 10 sessions/ • Vocational training Job Creation Support Health Services for Local Community Environmental Protection Support Infrastructure Development Protection of Cultural Heritage • +1000 Direct and indirect jobs created • +300 New jobs for province residents • Preventive screening and diagnosis for local community • Programs to improve the quality and accessibility of healthcare • Startup business support program • Support programs for herders and farmers • Interest-free loan program • Cultural festivals and events • Cultural heritage preservations initiatives • Community inclusive environmental monitoring • Conservation of biodiversity • ”Billion Trees” Initiative • Water supply system of Shinejinst soum • Sanitary facilities for soum elementary school and kindergarten • Road repair and maintenance • Feasibility study for the Bayankhongor-Shinejinst highway RECOGNIZING THE IMPORTANCE OF SAFETY, ENVIRONMENT & COMMUNITIES Partnering with Local Stakeholders to Improve Livelihoods
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2026 – A YEAR OF DELIVERY Producing gold today, building a district -scale future PRODUCER Bayan Khundii– Mongolia's newest gold mine GRADE Mining into higher-grade Striker & Midfield zones CASH FLOW US$30M project debt repaid in Q3 CAPITAL MARKETS TSX & MSE listed – a bridge for Canadian and Mongolian investors DISTRICT SCALE Dark Horse, BK West expansion, Altan Nar & heap leach potential EXPLORATION 16,500 m drill program underway ZUUN MOD Positioned to supply Asia's critical minerals Cash flow from Bayan Khundii funds growth across the Khundii Minerals District and Zuun Mod 20
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2026 DELIVERABLES AND CATALYSTS Executing on our Growth Strategy * Owned by Erdene Mongol (50/50 JV between Erdene & MMC) ** 100% owned by Erdene *** 80% option agreement GOLD/SILVER ALTAN NAR* – RESOURCE UPDATE GOLD BAYAN KHUNDII* – ACHIEVING STABLE PRODUCTION GOLD/COPPER TEREG UUL *** – DRILL PROGRAM GOLD ULAAN* – RESOURCE ESTIMATE & MINING LICENSE GOLD DARK HORSE* – DRILLING PROGRAM MOLYBDENUM ZUUN MOD ** – PEA COPPER KHUVYN KHAR ** – GEOPHYSICS & DRILL CAMPAIGN 21 • Transitioned to consistent operations and cash flow generation • Tested targets to unlock new potential • Maiden Resource Complete; mining license process commenced • Resource Update, Metallurgical Testing and Exploration Planning • Delivered robust PEA and Defining Development Plan • Evaluating resource growth and mine life extension opportunities • Targeting expansion potential within the Greater Dark Horse Area • Advancing a large-scale copper target through systematic exploration GOLD KHUNDII WEST* – EXPANSION TESTING
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CONTACTUS FOR MORE INFORMATION Phone (Canada): Phone (Mongolia): Website: Email: +1–902–423–6419 +976–7777–8534 www.erdene.com info@erdene.com ErdeneRes ErdeneResource DevelopmentCorp. FOLLOW US ON SOCIAL MEDIA TSX:ERD | MSE:ERDN | OTCQX:ERDCF QUESTIONS?