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IPO PresentationStaveley Arc Copper ExplorationHost to recognised copper-gold volcanic hosted massive sulphide (VHMS) systemMay 2021

Important InformationThe release, publication or distribution of this presentation in certain jurisdictions may be restricted by law and therefore persons in such jurisdictions into which thispresentation is released, published or distributed should inform themselves about and observe such restrictions.DISCLAIMERThis 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 throughproper subscription documentation and only to investors meeting strict suitability requirements. Any failure to comply with these restrictions may constitute a violation ofapplicable securities laws. In providing this presentation Resource Base Limited ACN 113 385 425 and its subsidiaries (“RBX”) has not considered the financial position or needsof the recipient. Persons needing advice should consult their stockbroker, bank manager, solicitor, attorney, accountant or other independent financial and legal advisors.The Prospectus is an important document and investors should read the document in its entirety and are advised to consult with their professional advisors before decidingwhether to apply for securities pursuant to the Prospectus. Any investment in the Company under the Prospectus should be considered speculative in nature.FORWARD LOOKING STATEMENTSVarious statements in this presentation constitute statements relating to intentions, future acts and events. Such statements are generally classified as “forward lookingstatements” and involve known and unknown risks, uncertainties and other important factors that could cause those future acts, events and circumstances to differ materiallyfrom what is presented or implicitly portrayed herein. Words such as “anticipates”, “expects”, “intends”, “plans”, “believes”, “seeks”, “estimates” and similar expressions areintended 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 whichthe statements are made.COMPETENT PERSON – JORC Code Compliant Mineral Resource Estimate and Exploration ResultsMr Mark Gifford (FAusIMM), a Competent Person as defined under the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and OreReserves’ (JORC Code) states that the information in this investor presentation concerning the Black Range Project is an accurate representation of the available data andstudies for the project.2

Table of ContentsCorporate OverviewOffer and TimelineCopper ThematicInvestment HighlightsBlack Range ProjectCatalystsContacts3

Corporate OverviewAdvisors and ConsultantsBoard of DirectorsShannon GreenJohn LewisJamie MyersPaul HisseyExecutiveChairmanExecutiveDirector /CFONon-ExecutiveDirectorNon-ExecutiveDirector (Proposed)Mining executive withover 20 years corporate,resourcedevelopmentand mining operationsexperience. Currently theMDofPathfinderResources(PF1.ASX).Previous roles include, MDofLindianResources(LIN.ASX) and GM ofProject Implementationfor Canyon Resources(ASX: CAY)Mr Lewis has is aCharteredAccountantwith more than 25 yearsexperience. Mr Lewis hasworked predominantly inthe resource sector inAustralia and overseas as aCompany Director, CFOand Company Secretary,mostrecentlyasCFO/Company Secretaryof ASX listed CanyonResources Limited.MrMyersisanexperiencedfinanceexecutive and companydirector with over 15yearscapitalmarketexperience. Mr Myers iscurrently an AssociateDirector of Corporate atBaker Young limited and aNon-Executive Director ofPathfinderResourcesLimited (ASX:PF1).Mr Hissey has a Bachelorof Science (Hons) inApplied Geology from theUniversityofSouthAustralia, a GraduateDiplomainAppliedFinance from Kaplan andhas further completed anMBA from the ChifleyBusiness School (La TrobeUniversity). Mr Hissey hasmore than 20 years’experience within theresources and capitalmarkets sectors.Independent GeologistMark GiffordLead ManagerInvestor Relations andMedia ConsultantsCorporateASX TickerIPO Share PriceRBXA 0.20Shares on issue(Min – Max Subs)(undiluted)41.09m –43.59mOptions on issuePost-Listing9.69mMarket cap (undiluted)(Min – Max Subs)Enterprise Value @ Listing 8.21m 8.71m 3.2m4

Offer and TimelineMinimumSubscriptionMaximumSubscription 5,000,000 5,500,000.00 0.20 0.205,936,6145,936,614Shares to be issued under the Offer25,000,00027,500,000Shares to be issued as part consideration for the Acquisition7,600,0007,600,000590,000590,000Shares to be issued to the Lenders in satisfaction of existing debts1,964,5381,964,538Gross Proceeds of the Offer 5,000,000 5,500,000Shares on issue Post-Listing (undiluted)441,091,15243,591,152Market Capitalisation Post-Listing (undiluted)5 8,218,230 8,718,230Enterprise Value @ listing (undiluted) 3,218,230 3,218,230Options on issue Post-Listing49,685,6409,685,640Shares on issue Post-Listing (fully diluted)50,776,79253,276,600Market Capitalisation Post-Listing (fully diluted)5 10,155,358 10,655,358Description1,3Offer price per ShareShares currently onissue2Shares to be issued to the FacilitatorIndicative TimelineLodgement of Prospectus with ASIC7 May 2021Exposure Period begins7 May 2021Opening Date17 May 2021Closing Date14 June 2021Issue of Shares under the Offer21 June 2021Dispatch of holding statements25 June 2021Expected date for quotation of shares on ASX2 July 2021Notes:1.The Consolidation of the Company’s issued capital (on the basis that every eight (8) Shares be consolidated into one (1) Share) is to be approved by Shareholders at the upcoming GeneralMeeting. Unless otherwise stated, all references in this Prospectus are on a post-Consolidation basis and are subject to rounding of individual Shareholdings.2.The total of 5,936,422 Shares on issue as at the date of this Prospectus includes the issue of 2,500,000 Shares at 0.14 per Share under the Pre-IPO Capital Raising to raise 350,000 (beforecosts).3.Refer to Section 5.6 with respect to the proposed impact of the Offers and Acquisition on the capital structure of the Company.4.Certain Shares and Options on issue post-listing will be subject to ASX-imposed escrow. Refer to Section 5.8 for further details.5.Assuming a Share price of 0.20, however the Company notes that the Shares may trade above or below this price.The Consolidation of the Company’s issued capital (on the basis that every eight (8) Shares be consolidated into one (1) Share) is to be approved by Shareholders at the upcoming General Meeting.Unless otherwise stated, all references in this Presentation are on a post-Consolidation basis and are subject to rounding of individual Shareholdings.5

Strong Copper ThematicStrong market fundamentals are anticipated to form ademand/supply imbalanceLME Copper Price3DemandCopper is a critical component in the transition to a lowcarbon, green economy 10,000Electric vehicles (EV), solar, wind-farms andbatteries/energy storage all require significant Cu inputs 8,000o Global economic resilience supports industrialisation demandSupply Mine grades globally are declining1 Limited exploration and project development2Price per Tonne (US ) 12,000 6,000 4,000 2,000 -Strong copper thematic anticipated to deliver enhancedcorporate activity from majors1. eclines-resource-depletion-to-impact-cu-bhp#: :text 0by%20that%20time.2 Goldman Sachs commodities research: Green Metals, Copper is the new oil, 13 April 20213. IRESS Data6

Clean Tech Demands CopperSolar TechnologyElectric VehiclesWind Farms An EV requires 5x the amount of Cuthan an internal combustion vehicle Cu is critical for efficiency andperformance of solar panels A 3 MW wind turbine contains up to4.7t of Cu The cabling for EV charging stationscontains up to 25kg of Cu 4.6t of Cu are required per MW in asolar power system Offshore projects to require twice asmuch Cu than onshore Cu is contained in the battery andmotor Cu is contained in interconnectors,wiring and investors Cu is contained in cables, generatorsand transformersCopper DemandCopper DemandCopper Demand2.6Mt – 3.2Mt1.6Mt – 3.3Mt1.3Mt – 2.1Mt40%25%20%in 2030of the green copper demandSource: Goldman Sachs commodities research: Green Metals, Copper is the new oil, 13 April 2021in 2030of the green copper demandin 2030of the green copper demand7

Mine Supply and Green DemandMine supply is predicted to fall below demandSource: Goldman Sachs commodities research: Green Metals, Copper is the new oil, 13 April 2021Green electrification is set to drive demand8

Investment HighlightsResource Base Limited (ASX: RBX) is a mineral exploration company focused on the developmentof highly prospective exploration projects with demonstrated potential for scalable discoveriesEstablished RegionRecognised VHMSUntested TargetsExploration ProgramBlack Range Project is located inthe well-known and highlyprospectiveStavelyVolcanicscorridor in north-west Victoria.Project is host to a recognisedcopper-goldvolcanic-hostedmassive sulphide (VHMS) systemknown as the Eclipse Prospect.Where a supergene blanket ofenrichedcopper(chalcocite)mineralisation is developed abovewidespread copper, gold and zincmineralisation.Opportunity to test the potential ofa 4km strike of a defined volcanicgraben at Eclipse.Aggressive exploration program atthe Eclipse Prospect, focused onquickly establishing an initialinferred JORC compliant resourcefrom existing geological datawithin 6 months of listing andestablishing the potential size andscale of the entire Project area.Multiple, untested base metal andgold targets over approximately100kmofStavelyArc volcanics.9

Black Range ProjectAcquiring 100% of the Black Range Project(EL4590) from Navarre Minerals Limited(ASX:NML) in an all script deal. NML jointhe register as a substantial shareholderTargeting volcanic massive sulphide,epithermal and porphyry copper-golddepositsProject host to a recognised copper-goldvolcanic hosted massive sulphide (VHMS)system known as the Eclipse ProspectNorth of the recent Thursdays Gossancopper discovery by Stavely MineralsLimited (ASX:SVY)Rich Chalcocite copper blanket locatedat the Eclipse prospect with grades up to3% Cu and 2.95g/t AuMassive Sulphide clasts intersected10

Black Range ProjectMultiple, untested targets overapproximately 100km of StavelyArc volcanics.Discovery of a number of copper and goldprospects such as Eclipse, Lexington andPollockdale.The Cambrian aged volcanics within theProject area are under explored due topresence of cover rock unitsFurther geophysical test work will be alsorequired throughout the Eclipse basin soas to define the source and opportunity.11

Black Range Project12