Announcement PDF PROPOSED NAME CHANGE A new chapter in high-grade gold discovery Castle Minerals Limited A S X | C D T Disclaimer Cautionary Statement: This presentation does not constitute investment advice. Neither this presentation nor the information contained in it constitutes an offer, invitation, solicitation or recommendation in relation to the purchase or sale of shares in any jurisdiction. This presentation does not take into account any person's particular investment objectives, financial resources or other relevant circumstances and the opinions and recommendations in this presentation are not intended to represent recommendations of particular investments to particular persons. All securities transactions involve risks, which include (among others) the risk of adverse or unanticipated market, financial or political developments. To the fullest extent permitted by law, Castle Minerals Limited (“Castle” or “the Company”) does not make any representation or warranty, express or implied, as to the accuracy or completeness of any information, statements, opinions, estimates, forecasts or other representations contained in this presentation. No responsibility for any errors or omissions from this presentation arising out of negligence or otherwise is accepted. Forward Looking Statement: Statements regarding Castle’s plans, forecasts and projections with respect to its mineral properties and programmes are forward-looking statements. There can be no assurance that Castle’s plans for development of its mineral properties will proceed. There can be no assurance that Castle will be able to confirm the presence of Mineral Resources or Ore Reserves, that any mineralisation will prove to be economic or that a mine will be successfully developed on any of Castle’s mineral properties. The performance of Castle may be influenced by a number of factors which are outside the control of the Company, its Directors, staff or contractors. Forward looking statements are only predictions and are subject to risks, uncertainties and assumptions which are outside the control of Castle. These risks, uncertainties and assumptions include commodity prices, currency fluctuations, economic and financial market conditions in various countries and regions, environmental risks and legislative, fiscal or regulatory developments, political risks, project delay or advancement, approvals and cost estimates. Actual values, results or events may be materially different to those expressed or implied in this presentation. Given these uncertainties, readers are cautioned not to place reliance on forward looking statements. Any forward-looking statements in this presentation speak only at the date of issue of this presentation. Subject to any continuing obligations under applicable law and the ASX Listing Rules, Castle does not undertake any obligation to update or revise any information or any of the forward-looking statements in this presentation or any changes in events, conditions or circumstances on which any such forward looking statement is based. Exploration Results & Mineral Resource Estimate – No New Information or Data: This presentation contains references to exploration results and Mineral Resource estimates, all of which have been cross- referenced to previous market announcements by the Company. Castle confirms that it is not aware of any new information or data that materially affects the information included in the original market announcements. Historical exploration results referenced in this presentation were previously reported by Kodal Minerals plc (AIM:KOD). Castle has not independently validated all aspects of the historical exploration data, including sampling methodologies, assay techniques and QA/QC protocols. Further work may be required before the historical exploration results can be relied upon for the purposes of Mineral Resource estimation or exploration targeting in accordance with the JORC Code (2012). Competent Person Statement: The scientific and technical information in this release that relates to the presentation of the deposits and exploration results is based on information compiled by George Michaelides, who is a Member of the Geological Society of South Africa (GSSA) and 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’. Mr Michaelides is the Qualified Person overseeing Castle’s exploration projects and has reviewed and approved the disclosure of all scientific or technical information contained in this release that relates to the geology of the deposits and exploration. The Company confirms that all material assumptions underpinning any forecast information continue to apply and have not materially changed. Further information on Castle and its projects and Mineral Resources can be found on its website at www.castleminerals.com which contains copies of all continuous disclosure documents to ASX, Competent Persons’ Statements and Corporate Governance Statement and Policies. Market and industry Data: This presentation includes market share information and industry data and forecasts which have been obtained from independent industry publications. Although these sources are believed to be reliable, no independent verification of the data has been made nor the underlying economic assumptions relied upon therein ascertained. Third-party sources generally indicate that they have obtained their information from sources believed to be reliable, but do not guarantee the accuracy and completeness of such information. It is believed that the market and industry data presented throughout this presentation is accurate, but no assurance as to the accuracy or completeness thereof is provided. Castle cannot and does not provide any assurance as to the accuracy or completeness of such included information. Market forecasts, in particular, are likely to be inaccurate, especially over long periods of time. Please refer to ASX and company website www.castleminerals.com for ASX releases pertaining to the contents of this presentation ASX | CDT 2 A Refreshed Platform. Clear Growth Engines. ASX | CDT 3 Two prolific gold discovery regions | Headline Nielle acquisition in Côte d’Ivoire Côte d’Ivoire Nielle Project Western Australia Murchison Meeka South ~2,054km2 Large scale Côte d’Ivoire Permit Portfolio Advanced, high-grade gold project with standout historic drilling intercepts in Birimian greenstone belt Significant West African Experience Recently appointed Steve Zaninovich (Managing Director) and Andrew Grove (Non-Executive Chairman) Near-Term Catalysts Nielle drilling, field surveys and expanded Côte d’Ivoire target generation ~184km2 Meeka South consolidated contiguous tenure in the Meekatharra district Expanded WA Murchison exposure Near-Term Catalysts Spectral analysis, field mapping, and Wanganui drill program Two Prolific Gold Discovery Regions Portfolio Led By Nielle ASX | CDT 4 Côte d’Ivoire Nielle + CDI East Growth Pipeline Nielle Advanced, drill-defined high-grade gold system (headline acquisition) Permit Pipeline Large-scale Côte d’Ivoire East land position Potential for Footprint Expansion Research bolt-on and new applications to build scale in a proven gold corridor Execution Supported Deep in-country West African experience and local stakeholder relationships Western Australia Murchison Meeka South Polelle + Wanganui + Meekasan Infrastructure Advantage Operating plants, roads, mining centres Multiple undrilled targets From reprocessed magnetics ~2,054km2 Côte d’Ivoire Permit Rights 8 Côte d’Ivoire Permits/Applications ~184km2 Consolidated Meeka South footprint Côte d’Ivoire Advanced gold project in proven jurisdiction boasting historical high-grade drill intercepts Headline Acquisition | Nielle Gold Project A West African Gold Discovery ASX | CDT 6 Nielle Project | Côte d'Ivoire Pre-Resource Discovery Story Few ASX West African peers are pre-resource yet carry a dataset as compelling as Nielle Historic 4,420m RC Drilling and 7,000m AC Historic wide mineralised intersections including high-grade zones but largely underexplored Mineralised Trend in Tier One Gold District Extends >4.5km and remains open along strike, proximal to major discoveries & operating gold mines Strong Alteration and Quartz-Carbonate Veining Suggests robust orogenic gold system with potential for high-grade shoots Clear Path to a Maiden Mineral Resource Validate historic dataset + infill and step-out drilling to define a near-term maiden MRE at Nielle Historic Drilling Includes Numerous High-Grade Gold Hits ASX | CDT 7 Nielle Project | Côte d'Ivoire Historic Exploration Dataset 4,420m of historic RC drilling 9 RC holes returned >5 g/t Au intercepts 7,000m of air core drilling 542 auger holes across the permit Deepest historic hole only 120m — open at depth Large Scale Potential in Prolific Gold Province Permit sits within Côte d'Ivoire's premier gold belt, surrounded by multimillion oz operations. Wide-spaced, shallow historic drilling with broad zones of consistent mineralisation provides strong potential for near-term Mineral Resource definition. Coherent 1km Shoot Defines Priority Drill Target ASX | CDT 8 Nielle Project | Côte d'Ivoire Selected Historic RC Intercepts across 1km Strike 5m @ 15.42g/t Au from 7m incl. 2m @ 31.54g/t Au from 8m [NLRC032] 13m @ 5.07 g/t Au from 12m incl. 3m @ 16.33 g/t Au from 13m [NLRC035] 9m @ 4.33g/t Au from 86m incl. 2m @ 16.88g/t Au from 88m [NLRC029] 12m @ 3.14 g/t Au from 21m incl. 2m @ 10.79g/t Au from 27m [NLRC038] 3m @ 4.83 g/t Au from 64m incl. 1m @ 13.34 g/t Au [NLRC040] Coherent 1km Mineralised Shoot — Priority Drill Target ✓ High-grade hits aligned along a continuous 1km strike ✓ Open at depth and along strike in both directions ✓ High-grade and shallow from surface, highlighting the potential scale and continuity of the mineralised system Near-Term Work Program & Catalysts ASX | CDT 9 Gold Projects | Côte d'Ivoire Nielle | Drilling Confirm and extend historic HG zones; step-out + infill drilling; define high-grade shoots and expand regional targets. CDI East Permits Complete soils program; progress applications to granted tenure; strengthen community engagement. Work Program + 12-month Catalysts Geology + Geophysics Integration Refine structural architecture + prioritise drill corridors. Nielle Maiden MRE Define drill targets with the primary objective of progressing systematic exploration toward future Mineral Resource estimation Nielle | Validation Complete review of historical dataset; expedite granting of formal licence Asset Assembly & Transaction Structure ASX | CDT 10 Nielle Project | Côte d'Ivoire Côte d'Ivoire: Nielle + Scalable Permit Pipeline Nielle Acquisition Adds a more advanced, drill defined high-grade gold project Nielle Portfolio Provides Growth Pipeline Rights to earn into eight permits (~1,842 km²) at CDI East. Earn-in / Milestone Structures Align capital deployment with value creation outcomes and preserve upside. Potential Footprint Expansion Evaluate additional high quality, advanced West African gold opportunities to build scale. Strategic Advantage Long standing in-country relationships and deep familiarity with the asset secured the opportunity ahead of peers. Western Australia Meekatharra district consolidation Murchison: Meeka South Meeka South Builds a Meaningful Murchison Position ASX | CDT 12 Meeka South | Murchison, WA Expanded Footprint In The Meekatharra Gold District Via proposed acquisition of Meekasan (68 km²). Creates a Contiguous ~184 km² Landholding By combining Meekasan with Polelle + Wanganui. Prime Location ~2 km from Westgold’s Paddy’s Flat operation (historic production 1.5+ Moz) and ~7 km from Great Boulder’s Mulga Bill (568 koz @ 2.7 g/t). Infrastructure Advantage Proximal to Bluebird processing mill and established mining services. Multiple Untested Targets Identified from reprocessed aeromagnetics (analogous signatures to nearby systems). Existing WA Assets add Optionality + Discovery Upside ASX | CDT 13 Meeka South | Murchison, WA Castle retains 100% of Polelle + Wanganui Following expiry of the GBR option (30 Nov 2025). Wanganui Historical RC drilling indicates high-grade shoots below shallow oxide pits (open along strike and depth). Selected Historical Intercepts 3m @ 18.66 g/t Au from 62m; 8m @ 4.10 g/t Au from 66m; 10m @ 3.34 g/t Au from 56m. Multiple Sub-Parallel Lode Positions Main Lode + East Lode + Far East Lode (targets over 1km-scale). Polelle Underexplored greenstone belt; Albury Heath shear traceable into licence; proximity to Bluebird mine. Near-Term Plan Geochem → Targets → Drilling ASX | CDT 14 Meeka South | Murchison, WA Wanganui Drill Program To characterise alteration halos via district pathfinders Systematic Field Checking Of priority targets interpreted from reprocessed magnetics Progress to AC/RC Drilling Generate Meeka South drill targets from field observations and geophysical interps Integrate Legacy Drilling And New Datasets To define “next drill” corridors across Meeka South Tenement-Wide Soil Geochemistry To characterise Meeka South alteration halos via district pathfinders Refocused Tier 1 Ambition ASX | CDT 15 Strategic decision to exit gold in Ghana and focus on defining a tier 1 assets 100% divestment of CDT Ghana entity, Carlie Mining Limited, holder of 7 permits subject to renewal Non-binding terms sheet signed; progressing binding share purchase agreement, subject to conditions precedent Purchaser to acquire Carlie Mining for a staged cash payment of US$400,000 (~A$555,000) CDT is reasonably confident that the conditions to executing a binding agreement will be satisfied Ghana Divestment Strategy Expected Newsflow ASX | CDT 16 2Q26 3Q26 4Q26 1Q27 Côte d’Ivoire Permit grant updates Re-interpretation of existing results Exploration Target definition Drill program execution & follow-ups WA Wanganui initial drill program Target ranking from magnetics AC/RC drill test priority targets GHANA Updates on divestment progress Corporate ASX | CDT 17 *as at 18 May 2026. 173.4m Shares on Issue* 116.7m Unlisted Options* 22.6m Performance Rights* A$2.2m Cash A$8.7m Market Cap A$6.5m Enterprise Value At $0.05 share price At 31 March 2026 Leadership Built For West African Execution Board and management assembled in the past year Deliberately structured around the ambition to deliver a transformational Côte d’Ivoire gold play. Deep African experience across the full lifecycle Positioned to advance Castle from exploration through financing and into development. Leverage network across West Africa To source and progress high-grade opportunities. Andrew Grove Non-Executive Chair Veteran geologist, 35+ yrs. Former MD/CEO of Chesser Resources (Diamba Sud, Senegal) and Group GM at Perseus Mining (Ghana, Côte d'Ivoire). 14 yrs at Macquarie Bank mining finance. Mohamed Niare In Country Manager West African mining veteran with 25+ yrs across Côte d’Ivoire, Senegal and Mali. Matt Horgan Non-Executive Director African-focused mining executive with 14+ yrs experience across investment banking & corporate development. Steve Zaninovich Managing Director Mining executive, 25+ yrs West Africa. Director of Operations at Kodal Minerals (Bougouni Lithium, Mali). Previously COO of Gryphon Minerals (Banfora gold, Burkina Faso) and Project Director at Akyem Gold (Ghana). ASX | CDT 18 Discovery Driven Strategy Clear priorities. Disciplined execution. Advance Nielle Validate, extend and define high-grade shoots Build scale in Côte d’Ivoire Convert tenure and add quality ground Generate WA targets efficiently Targeting, refining and drilling ASX | CDT 19 Contact A S X | C D T Steve Zaninovich Managing Director enquiries@castleminerals.com