#1Lithium, James Bay District, Québec REE's, Vic / SA Copper / Gold, Stavely COMPANY PRESENTATION | MAY 2023 RESOURCE ✓ BASE ASX:RBX#2Important Notice and Disclaimer The release, publication or distribution of this presentation in certain jurisdictions may be restricted by law and therefore persons in such jurisdictions into which this presentation is released, published or distributed should inform themselves about and observe such restrictions. Released with the authority of the Board May 2023. Disclaimer This presentation is for informational purposes only and does not constitute an offer to sell, or solicitation to purchase, any securities. Such offer can be made only through proper subscription documentation and only to investors meeting strict suitability requirements. Any failure to comply with these restrictions may constitute a violation of applicable securities laws. In providing this presentation Resource Base Limited ACN 113 385 425 and its subsidiaries ("RBX") has not considered the financial position or needs of the recipient. Persons needing advice should consult their stockbroker, bank manager, solicitor, attorney, accountant or other independent financial and legal advisors. Forward Looking Statements Various statements in this presentation constitute statements relating to intentions, future acts and events. Such statements are generally classified as "forward looking statements" and involve known and unknown risks, uncertainties and other important factors that could cause those future acts, events and circumstances to differ materially from what is presented or implicitly portrayed herein. Words such as "anticipates", "expects", "intends", "plans", "believes", "seeks", "estimates" and similar expressions are intended to identify forward-looking statements. RBX caution shareholders and prospective shareholders not to place undue reliance on these forward-looking statements, which reflect the view of RBX only as of the date of this presentation. The forward-looking statements made in this presentation relate only to events as of the date on which the statements are made. Competent Person Statement The information in this report which relates to Exploration Results is based on, and fairly represents, information compiled by Mr Edward Mead. Mr Mead is a Member of the Australian Institute of Geoscientists (AIG) and consultant of the Company. Mr Mead has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves' (the JORC Code). The Company confirms that it is not aware of any new information or data that materially affects the information in the relevant market announcement. Mr Mead consents to the inclusion in this report of the matters based on his information in the form and context in which it appears. 2 Investor Presentation | May 2023 RESOURCE BASE#33 Corporate Snapshot: Board & Management Maurice Feilich Non-Executive Chairman Brent Palmer Executive Director Paul Hissey Non-Executive Director Dan Smith Company Secretary Mr Feilich has been involved in investment markets for 30 years, commencing his career as an institutional derivative broker at Mcintosh Securities (later Merrill Lynch) in 1998. He joined Tricom Equities in 2000 as Head of Equities, and in 2010 became a founding partner of Sanlam Private Wealth. Mr Feilich is also currently Executive Chairman of QX Resources Ltd (ASX: QXR), where he has been heavily involved in project origination through his extensive networks. He holds a Bachelor of Commerce with a major in Marketing and Business. Mr Palmer has circa 10 years' experience in the capital markets, and is a founding director of Bluebird Capital, a project generation, investment and corporate advisory business. He has built a comprehensive network and strong stockbroker relationships across Australia. He is a member of the Australian Institute of Company Directors (GAICD). Mr Palmer holds a Bachelor of Commerce with a major in Property from Curtin University, together with a Post Graduate degree in Mineral and Energy Economics from the WA School of Mines. Mr Hissey has a broad range of technical, financial and market experience achieved through more than 20 years working firstly as a geologist in mining operations in resource and production roles before a transition to capital markets as a respected research analyst with global investment banks RBC and Goldman Sachs. Paul has a Bachelor of Applied Science (Hons) from the University of South Australia, as well as an MBA from the Chifley Business School and a Graduate Diploma in Applied Finance from Kaplan Professional. Mr Smith is a director and co-founder of Minerva Corporate Pty Ltd, a boutique corporate services and advisory firm. Mr Smith holds a Bachelor of Arts, is a Fellow of the Governance Institute of Australia, and has 15 years primary and secondary capital markets expertise. He has advised on and been involved in over a dozen IPOs and RTOs on the ASX, AIM and NSX. He is currently non-executive director and/or company secretary for a number of companies operating in the resources sector and has been heavily involved in project origination and evaluation. Investor Presentation May 2023 RESOURCE BASE#4Corporate Snapshot: Post James Bay Transaction RBX Corporate Structure ASX Code Corporate Overview $0.12 Rank Name Shares Shares % 1 NAVARRE MINERALS LIMITED 7,600,000 9.19 Share Price 2 NORANDA ROYALTIES INC 6,833,333 8.26 3 HARBOUR VIEW CAPITAL PTY LTD 3,830,000 4.63 82,684,485 23% 4 BRENT GRAEME PALMER Shares on Issue Held by Board and Management 5 BLACKBIRD CAPITAL 20,185,640 Options on Issue (ex. $0.20 $0.25) $9.9m Market Cap (undiluted) 4 Investor Presentation | May 2023 2,255,556 2.73 1,775,000 2.15 Shareholder Breakdown 48% Top 20 52% Others RESOURCE BASE#5☑ Resource Base Projects James Bay District, Québec The most emerging lithium province globally 5 Investor Presentation | May 2023 819-797-1 CILL 13 206 RESOURCE BASE#6☑James Bay Investment Highlights 1674502 2 lithium projects Acquisition of two projects in highly prospective region with large, high grade established lithium resources Location Projects are adjacent or close to exciting discoveries including Patriot Metals, Cosmos Exploration and Winsome Resources Fiscal support Unprecedented government support for EV sector underwriting long term demand for domestic lithium markets ☑» Prospective geology Both projects sit on extensions of structures hosting high-grade intersections and with numerous outcropping spodumene observed In-country team Project vendor stays on as in-country management consultant with extensive exploration network actively preparing for upcoming campaign and surveys (M Drilling soon Plan for drilling to commence within months following initial ground work to define targets 6 Investor Presentation | May 2023 RESOURCE BASE#7☑James Bay Lithium District, Québec SIGNIFICANT LITHIUM RESOURCES AND DISCOVERIES JAMES BAY LITHIUM REGION, QUEBEC Raddison Chisasibi • • • James Bay is undoubtably the most exciting, emerging lithium province globally Region hosts major resources including, key lithium players such as Allkem with an Ore Reserve of 37.2Mt James Bay project grading 1.3% Li₂O Region has seen numerous new discoveries including Patriot's CV5 (close to Wali) and Winsome's Adina (close to Ernst Lake) Resource Base seeking to identify and prioritise prospective targets for a maiden exploration program in early June Wali shares the same greenstone as Cosmos' highly prospective Corvette Far East Project JAMES BAY ST. RESOURCE BASE 7 Investor Presentation | May 2023 Eastmain BRISK LI PROJECT (ASX: LLI) CORVETTE LI PROJECT (TSXV: PMET) La Grande-Quatre CORVETTE FAR EAST PROJECT (ASX:C1X) JAMES BAY LI PROJECT [email protected]% Li₂O (ASX:AKE) MOBLAN LI PROJECT [email protected]% Li₂O (ASX:SYA) 父 父 父 父父 CANCET LI PROJECT 15-25Mt@1-2% Li₂O (ASX:WRI) ROSE LI PROJECT [email protected]% Li₂O (TSXV:CRE) F LA FORGE LI PROJECT (ASX:PR1) CYCLONE PROJECT (ASX:MEG) ADINA LI PROJECT (ASX: WR1) TRIESTE LI PROJECT (ASX: LLI) WALI PROJECT (ASX:RBX) ERNST LAKE PROJECT (ASX:RBX) 0 50 100 150km RESOURCE BASE#8☑James Bay Lithium District, Québec Wali Project ⚫ The Wali project covers an area of 51km² The greenstone belt within the project is interpreted to be a 'dismembered' section of the same belt that hosts Patriot's CV5 discovery, just 16km to the West Greenstone occurs at contact between tonalite to the south and granodiorite to the north supporting project's prospectivity Wali Project sits within the Guyer Formation Volcanic Belt with multiple pegmatite injections Outcropping pegmatites noted RESOURCE BASE Wali Project Tenements 53°30' Resource Base Tenements Winsome Resources Tenements Patriot Battery Metals Tenements CosmosX Tenements Roads Lithium Prospect/Deposit Corvette Lithium Trend Simplified Geology Greenstones Granite and Granodiorite Granite and Biotite CV10 CV9 CV12 CV5 CV4 -73°45' -73°30' -73°15' -73° Corvette CV8 CV6 RBX23006 DigiMops -74°30' -73°15' -74° -73°45' -73°30' -73°15' I Montrea QUEBEC James Bay Projects WALI Project Wali Project N 25km -73° 8 Investor Presentation | May 2023 53°30' RESOURCE BASE#9☑ James Bay Lithium District, Québec 53°20' -72°40' -72°35' -72°30' -72°25' -72°20' -72°15' -72°10' 53°20' Ernst Lake Project ⚫ The Ernst Lake project comprises 109 mineral claims and covers an area of 56km² ⚫ The greenstone belt within the project is interpreted to be the south section of the same belt that hosts Winsome's Adina discovery, 13km to the North Project is contiguous with Loyal Lithium's Trieste project Outcropping pegmatites noted within the amphibolite and pegmatites recorded within the greenstone belt -53°15' N 5km RESOURCE BASE Ernst Lake Project Lithium Prospect/Deposit Tenements Resource Base Tenements Winsome Resources Tenements Loyal Lithium Tenements Simplified Geology 9 Investor Presentation | May 2023 Adina Ernst Lake Project Greenstones Granite and Granodiorite Granite Pegmatic Montréal 5' -72°30' -72°25' -72°20' -72°15' I QUEBEC James Bay Projects Ernst Lake Project 53°15 DigiMaps RBX23007 RESOURCE BASE#10Lithium demand creates massive regional opportunity • • The James Bay region in Quebec is ideally located to service both planned and existing North American lithium ion battery initiatives Unprecedented government support for the North American EV sector via the US$370 billion Inflation Reduction Act which is attracting key players Volkswagen Group has recently announced that it would build a Gigafactory in Canada as part of a $193 billion investment to hit its EV targets EV sector growth is underwriting growing deficit with Fastmarkets forecasting a growing lithium deficit for the rest of this decade Quality projects located close to these fast- expanding regional markets will have immense strategic value NORTH AMERICAN Analysis by CIC energiGUNE BATTERY INITIATIVES Version 3. Last update: 02/12/2021 Solid Power Since 2019 it has a pilot produc- tion line for solid electrolyte batteries that aims to scale up to a gigafactory by 2023. BRITISHVOLT POWER ON Planned a 60 GWh capacity plant in Quebec, Canada. ③LION ELECTRIC Announced in March 2021 its intention to open in Quebec in 2023 a plant with 5 GWh capacity STROMV LT Announced a battery cell factory in Quebec; aims to produce 10 GWh by 2030 StoreDot Recently announced an R&D center to accelerate the market introduction of solid-state batteries (exact location to be determined). QuantumScape Working on the development of its first pilot line in San Jose (California) with the objective of scaling it up in 2024. SILA NANOTECHNOLOGIES It has launched a pilot line in 2021, which it expects to scale up in 3 years. TESLA Two operational plants (Nevada with 35 GWh and Buffalo dedicated to solar cells of 2 GWh). It expects to open its new gigafactory in Austin (Texas) with up to 100 GWh by the end of 2021 and has a pilot line. in Fremont (California) microvast 2 GWh plant in Clarksville, Tennessee (2022) LG Chem It has a 5 GWh capacity plant n Holland, Michigan. SK innovation Ford Development of the "Blue Oval City" project in Kentucky with two gigafactories and a third one in Staton (Tennessee), each one with a capacity of 43 GWh + SES Announced in March 2021 its agreement with General Motors to develop a pilot line starting in 2023 in Woburn (Massachusetts) OPERATIONAL PLANT PROJECT IN PROGRESS OPERATIONAL PILOT LINE OR IN PROGRESS gm iM3NY Aims to develop a plant by 2022 with a capacity of 1 GWh (expandable to more than 15 GWh) LG Chem This joint venture plans to open a plant in Lordstown (Ohio, with 30-35 GWh) in 2022 and in Spring Hill (Tennessee) in 2023 (with similar capacity) TOYOTA Announced to invest in a new battery plant in the U.S., although it has not yet confirmed either the final location or capacity FREYR KIKOCH They have announced a Joint venture (50% each) to start building a gigafactory in the USA (the final location has not yet been determined) SK innovation It is building two plants in Georgia planned for 2021 and 2023, with initial capacities of 10 and 12 GWh respectively (with the potential to increase beyond 25 GWh) SaFT 1 GWh plant in Jacksonville, Florida STELLANTIS LG Chem Announced that they will form a Joint Venture to operate, starting in 2024, a gigafactory of about 40 GWh. 10 Investor Presentation | May 2023 RESOURCE BASE#11Resource Base Projects Western Victoria and South Australia RESOURCE 11 Investor Presentation | May 2023 BASE#12☐ Mitre Hill Project, Victoria/South Australia Maiden JORC resource of 21 Million tonnes @ 767 ppm TREO 7,022km2 in Western Victoria and South Australia in an emerging clay-hosted Rare Earth Element (REE) precinct Maiden JORC Inferred Mineral Resource estimate of 21 Mt @ 767 ppm TREO Along strike from Australian Rare Earths' (ASX:AR3) Koppamurra project Very shallow, flat-sitting mineralisation. Approx 30% NdPr, with low Uranium & Thorium which is key Lucindale Naracoorte 5,900,000mN Edenhope Penola Nangwarry Casterton Millicent SOUTH AUSTRALIA Expansion potential with additional 13 – 34 Mt grading 630-830 ppm TREO at exploration Target Follow up infill drilling currently being planned on the Mitre Hill project RESOURCE BASE Mitre Hill Project Legend Town Road Tenements Refer to ASX Announcement dated 3 February 2023 12 Investor Presentation | May 2023 600,000mE VICTORIA Murtoa Horsham Dunkeld Merino Hamilton Penshurst Heywood Resource Base Tenement Australian Rare Earths Limited Savic Minerals Pty Limited Lanthanein Resources Limited SOUTHERN OCEAN Portland Port Fairy Warrnambool 600,000mE Ararat Mortlake Terang 700,000mE Map Location 50km Skipton 5,800,000mN RESOURCE BASE#13Black Range Project, Victoria Targeting volcanic massive sulphide, epithermal and porphyry copper, gold & zinc mineralisation • • Project hosts a recognised copper, gold & zinc VHMS system (the Eclipse Prospect) North of the recent Thursdays Gossan copper discovery by Stavely Minerals Limited (ASX:SVY) Gravity and IP/Resistivity Geophysical Survey. New zone of interest identified with numerous targets hosted in favourable geological setting The tenement requires conversion to a retention licence given its maturity and therefore, our corporate strategy in light of the recent acquisitions has been to deprioritise exploration on this asset until granted -5,920,000mN Project Location 5,880,000mN Casterton 15km 13 Investor Presentation | May 2023 RESOURCE BASE Black Range Project Legend Resource Base Tenement. Town Road 560,000mE Coleraine amilton Rd. Natimuk Hamilton 600,000mE Hently Hwy. Horsham Dunkeld-Cavendish Rd. Halls Gap 640.000mE 5,920,000mN- 5,880,000mN 5,840,000mN- Dunkeld 600,000mE Penshurst DigiMops RAK22007 RESOURCE BASE#14Summary Li al HO 20000 Acquired two lithium projects in James Bay, a highly prospective region hosting large, high-grade established lithium resources Projects are close to exciting discoveries made by Patriot Metals and Winsome Resources Both James Bay projects sit on similar greenstone extensions of structures hosting high-grade intersections Plan for infill and expansion drilling on Mitre Hill, whilst simultaneously targeting maiden drill campaign in James Bay to commence within months Australian project, Mitre Hill has a robust 21 Mt clay-hosted REE JORC resource announced Feb 2023 Australian project, Black Range hosting a Copper-Gold project within the Stavely System 14 Investor Presentation | May 2023 RESOURCE BASE#15Contact Us Brent Palmer E [email protected] W resourcebase.com.au RESOURCE BASE