Announcement PDF Page 1 of 8 | ABN 43 650 398 897 12/217 Howick St, Bathurst, 2795 www.legacyminerals.com.au See Endnotes on Page 8 for references Refer to Disclaimer on Page 4 New Scandium Resource Underway at NiCo Young Nickel- Cobalt Project, NSW WSP engaged to assess scandium alongside NiCo Young’s existing large-scale nickel-cobalt Resource, with an updated MRE expected in October 2026 COMBINED Ni-Co-Sc RESOURCE UPDATE UNDERWAY • WSP Australia Pty Limited (WSP) has been engaged to complete an updated Mineral Resource Estimate (MRE) for the Company’s 100%-owned NiCo Young Nickel-Cobalt-Scandium (Ni-Co-Sc) Project in central New South Wales (NSW). • For the first time, the updated MRE will assess the potential to estimate and report scandium (Sc) alongside the Project’s existing nickel (Ni) and cobalt (Co), updating the current nickel-cobalt Inferred Mineral Resource. BUILDING ON ONE OF AUSTRALIA’S LARGEST Ni-Co RESOURCES • The current NiCo Young Inferred Mineral Resource is 167.8Mt at 0.59% Ni for 996.7kt of contained nickel and 96.6kt of contained cobalti . • This includes a higher-grade component of 42.5Mt at 0.80% Ni and 0.09% Co at a 1.0% NiEq cut-off, for 338.8kt of contained nickel and 38.0kt of contained cobalt. • Legacy Minerals’ NiCo Young Project is among the two largest identified nickel-cobalt deposits in NSW and is 100%-owned by Legacy Minerals, free of royalties, liabilities and encumbrances. SCANDIUM POTENTIAL ADDS A THIRD CRITICAL MINERAL • The updated MRE will assess discrete, near-surface scandium mineralisation. • Scandium is recognised at the NiCo Young Project and occurs as a co-product of nickel-cobalt laterite systems elsewhere in the Lachlan Fold Belt, which hosts Australia’s most significant reported scandium resources (Table 2). • The updated Ni-Co-Sc Mineral Resource Estimate is expected to be completed in October 2026. Resource Update Underway WSP has commenced an updated Mineral Resource Estimate for the NiCo Young Project that will, for the first time, aim to will assess, for the first time, the potential to report scandium alongside nickel and cobalt. The current Inferred Mineral Resource, which reports nickel and cobalt only, is summarised in Table 1 below and remains current until the updated MRE is reported. Table 1. NiCo Young current Inferred Mineral Resource. Refer to the ASX release of 1 July 2025 for the full Mineral Resource Estimate, supporting notes and JORC Table 1 disclosure. Cut-off Tonnes (Mt) Ni (%) Co (%) Contained Ni (kt) Contained Co (kt) 0.6% NiEq 167.8 0.59 0.06 996.7 96.6 1.0% NiEq 42.5 0.80 0.09 338.8 38.0 ASX Announcement 17 September 2026 ASX: LGM ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 2 of 8 Legacy Minerals Holdings Limited (ASX: LGM, “LGM”, “the Company” or “Legacy Minerals”) is pleased to advise that an updated Mineral Resource Estimate (MRE) is underway for its 100%-owned NiCo Young Nickel-Cobalt-Scandium (Ni-Co-Sc) Project, located near Wallendbeen in central New South Wales (NSW), which will report scandium (Sc) alongside nickel (Ni) and cobalt (Co) for the first time. Management Comment Legacy Minerals CEO and Managing Director, Christopher Byrne, said: “NiCo Young already hosts one of Australia’s largest contained nickel and cobalt Resources, 100% owned by Legacy Minerals and free of royalties and encumbrances. What was never captured in that Resource is scandium, despite scandium having been known at the Project since 2011. Engaging WSP to assess a combined nickel-cobalt-scandium Mineral Resource is about putting the full value of the deposit in front of shareholders. Scandium is a scarce, critical mineral with a very small global supply base, and the Lachlan Fold Belt is one of the few places in the world where it occurs at scale in nickel-cobalt laterite systems. WSP delivered our Mt Carrington Mineral Resource earlier this year and we have confidence in their technical rigour. We expect to report the updated Resource in October 2026.” Figure 1. Nickel-cobalt-scandium deposits and occurrences of New South Wales, showing the NiCo Young Project and the reported Mineral Resource at each deposit (see Appendix 2 for MRE Breakdown) ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 3 of 8 Scope of the Updated Mineral Resource Estimate (MRE) WSP has been engaged to prepare an updated MRE for the NiCo Young Project. WSP is one of the world’s leading engineering and advisory firms and prepared the Company’s July 2026 Mineral Resource Estimate for the Mt Carrington Gold-Silver Project. The updated MRE will include nickel and cobalt and, for the first time, will incorporate discrete, near-surface scandium domains which will be reported in accordance with the JORC Code 2012, producing a single combined Ni-Co-Sc Mineral Resource. The work program comprises compilation and validation of the historical scandium assay data and drillhole database, geological, weathering and scandium domaining, grade estimation and classification, and the derivation of updated cut-off grades and reasonable prospects for eventual economic extraction parameters. Results are expected in October 2026. Scandium at the NiCo Young Project A review of historical work at the NiCo Young Project identified the presence of near-surface scandium, which has not been incorporated into the current Mineral Resource. As part of preparing an updated MRE for the NiCo Young Project, WSP will evaluate whether a scandium Mineral Resource can be reported under the JORC Code 2012. Scandium in the Lachlan Fold Belt occurs as a co-product of nickel-cobalt laterite systems, hosted within the same weathered profile as the nickel and cobalt mineralisation at the Ardnaree and Thuddungra deposits (Figure 1). Mineralisation at the NiCo Young Project extends from near surface to a maximum vertical depth of 56m at Ardnaree and 98m at Thuddungra, and is amenable to low- cost, open-cut mining with little or no blasting required. The Company also has a non-binding, three-year Memorandum of Understanding (MoU) in place with Cobalt Blue Holdings Limited (ASX: COB), entered into in October 2025, under which the parties are assessing strategic options for cobalt and other products that may be extracted from the NiCo Young Project. The MoU remains in place and is unaffected by the updated MRE. Ni-Co-Sc Deposits of New South Wales The NiCo Young Project sits within the Lachlan Fold Belt, which hosts Australia’s most significant nickel-cobalt laterite deposits and its only reported primary scandium Mineral Resources. The major nickel, cobalt and scandium deposits of New South Wales are shown in Figure 1 and summarised in Table 2 – and are provided for context only. Table 2. Reported nickel, cobalt and scandium Mineral Resources at major New South Wales deposits, provided for context only (see Appendix 2 for MRE Breakdown) Deposit (Owner) Location Reported Mineral Resource NiCo Young (Legacy Minerals Holdings Limited, ASX: LGM) Wallendbeen 167.8Mt @ 0.59% Ni, 0.06% Co (0.6% NiEq cut-off); scandium not yet reported Sunrise (Sunrise Energy Metals Limited, ASX: SRL) Fifield 180Mt @ 0.53% Ni, 0.10% Co, 92ppm Sc (0.35% NiEq cut-off), for 16,000t contained scandium Syerston scandium (Sunrise Energy Metals Limited, ASX: SRL) Fifield 51.7Mt @ 408ppm Sc (300ppm Sc cut- off) for 21,090t contained scandium, including 45.9Mt @ 414ppm Sc classified as Measured and Indicated Flemington (Australian Mines Limited, ASX: AUZ) Fifield 6.3Mt @ 446ppm Sc (98% Measured and Indicated, 300ppm Sc cut-off), with 1,350ppm Ni and 601ppm Co ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 4 of 8 Deposit (Owner) Location Reported Mineral Resource Burra / Platina Scandium (Rio Tinto; previously Platina Resources Limited, ASX: PGM) Fifield 35.6Mt @ 405ppm Sc, 0.10% Ni, 0.06% Co (300ppm Sc cut-off) for 22,000t contained Sc₂O₃, including 20.3Mt @ 420ppm Sc classified as Measured and Indicated Nyngan (Scandium International Mining Corp., TSXV: SCY) Nyngan 16.9Mt @ 235ppm Sc (Measured and Indicated, 100ppm Sc cut-off) Broken Hill Cobalt Project (Cobalt Blue Holdings Limited, ASX: COB) Broken Hill 126.5Mt @ 690ppm Co and 7.5% S, for 87.3kt contained cobalt Note: Peer figures are drawn from the public disclosures of the respective owners, are current as at the date of this announcement to the best of the Company’s knowledge, and are provided for context only. Peer deposits are not necessarily analogous to the NiCo Young deposit, and the presence of scandium at a neighbouring project is not an indication that a scandium Mineral Resource will be reported at NiCo Young. Rio Tinto has not published a Mineral Resource estimate for Burra since acquiring the project in April 2023, and the figure shown is the estimate reported by the previous owner, Platina Resources Limited, in August 2018. The Nyngan estimate is reported under NI 43-101 and not under the JORC Code. The classification breakdown and the source announcement for each deposit are set out in Appendix 2. The West Lynn, Mulholland, Homeville and Fontenoy occurrences shown in Figure 1 have no publicly reported Mineral Resource. Next Steps WSP will complete the compilation and validation of the historical scandium assay data, followed by scandium domaining, grade estimation and classification. The Company expects to report the updated combined Ni-Co-Sc Mineral Resource Estimate in October 2026, together with the supporting JORC Code 2012 Table 1 disclosure. Work under the Cobalt Blue MoU also continues in parallel and any significant developments will be reported. Approved by the Board of Legacy Minerals Holdings Limited For more information: Investors: Chris Byrne CEO & Managing Director chris.byrne@legacyminerals.com.au +61 (0) 499 527 547 Media: Nicholas Read Read Corporate nicholas@readcorporate.com.au +61 (0) 419 929 046 DISCLAIMER AND PREVIOUSLY REPORTED INFORMATION Information in this announcement is extracted from reports lodged as market announcements referred to above and available on the Company’s website https://legacyminerals.com.au/. In particular, the Mineral Resource Estimate for the NiCo Young Project is extracted from the ASX release “NiCo Young Mineral Resource Estimate Review” dated 1 July 2025. The Company confirms that it is not aware of any new information that materially affects the information included in the original market announcements and that all material assumptions and technical parameters underpinning the estimates in the relevant market announcements continue to apply and have not materially changed. This announcement contains certain forward-looking statements, including statements regarding the scope, timing and outcome of the updated Mineral Resource Estimate for the NiCo Young Project. Forward-looking statements are only predictions and are subject to risks, uncertainties and assumptions which are outside of the control of Legacy Minerals Holdings Limited (LGM). These risks, uncertainties and assumptions include commodity prices, currency fluctuations, economic and financial market conditions, environmental risks and legislative, fiscal or regulatory developments, political risks, project delay, approvals and cost estimates. There is no certainty that a scandium Mineral Resource will be able to be reported for the NiCo Young Project. Actual values, results or events may be materially different to ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 5 of 8 those contained in this announcement. Given these uncertainties, readers are cautioned not to place reliance on forward-looking statements. Any forward-looking statements in this announcement reflect the views of LGM only at the date of this announcement. Subject to any continuing obligations under applicable laws and ASX Listing Rules, LGM does not undertake any obligation to update or revise any information or any of the forward-looking statements in this announcement to reflect changes in events, conditions or circumstances on which any forward-looking statement is based. COMPETENT PERSON’S STATEMENT – NICO YOUNG The information in this announcement that relates to the Mineral Resource Estimate for the NiCo Young Project is extracted from the ASX release “NiCo Young Mineral Resource Estimate Review” dated 1 July 2025 and available on the Company’s website at https://legacyminerals.com.au/. That information was reviewed and critically assessed by Andrew Waltho (BAppSc (Hons), FAusIMM, FAIG, RPGeo, FGS, Professional Member SME, GAICD), an employee of ERM Australia Consultants Pty Ltd (ERM), of whom Legacy Minerals Holdings Limited is a client. Mr Waltho has sufficient experience in exploration, evaluation and Mineral Resource estimation that is relevant to the style of mineralisation and type of deposit under consideration 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 Waltho consents to the inclusion of the matters based on his information in the form and context in which it appears. The Company confirms that it is not aware of any new information or data that materially affects the information included in the original market announcement and that all material assumptions and technical parameters underpinning the estimate continue to apply and have not materially changed. COMPETENT PERSON’S STATEMENT – LEGACY MINERALS PORTFOLIO The information in this announcement that relates to Exploration Targets, Exploration Results, Mineral Resources or Ore Reserves across the broader Legacy Minerals portfolio is based on information compiled by Thomas Wall, a Competent Person who is a Member of the Australian Institute of Geoscientists. Mr Wall is the Technical Director and a full-time employee of Legacy Minerals Pty Limited, the Company’s wholly-owned subsidiary, and a shareholder of the Company. Mr Wall has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity being undertaken 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 Wall consents to the inclusion of the matters based on this information in the form and context in which it appears in this announcement. ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 6 of 8 About Legacy Minerals Legacy Minerals is an ASX-listed public company that has been exploring gold, silver, copper, nickel and base- metal projects in NSW since 2017. The Company’s projects present significant discovery opportunities for shareholders, with a focus on discovery drilling and the development of the Mt Carrington Project, alongside the 100%-owned NiCo Young Nickel-Cobalt-Scandium Project (Figure 2). Au-Ag-Cu Mt Carrington (EL6273, EL9616, EL9727, ALA75) Large caldera (~150km2 ) with similar geological characteristics to other major Pacific Rim low-sulphidation deposits. The current Mineral Resource of 1.6Moz AuEq (refer ASX release 30 July 2026). Au-Ag Bauloora One of NSW’s largest low-sulphidation, epithermal systems with a 15 km2 epithermal vein field. Ni-Co-Sc NiCo Young Cobalt Blue MoU One of Australia’s largest nickel and cobalt deposits, with a combined Ni-Co-Sc Mineral Resource update underway. Cu-Au Rockley Prospective for porphyry Cu-Au, situated in the Macquarie Arc Ordovician host rocks with historical high-grade copper mines. Au-Cu (Pb-Zn) Cobar Aurelia Metals Earn-In Undrilled targets next door to the Peak Gold Mines and along strike of the CSA copper mine. Au-Ag Black Range Extensive low-sulphidation, epithermal system with limited historical exploration. Epithermal occurrences across 30 km of strike. Au Harden Hill Tops Joint Venture Substantial historical gold production from two high-grade and underexplored, orogenic systems. Cu-Au Thomson A new and unexplored Intrusion-related gold and copper search space with numerous ‘bullseye’ targets. Au-Cu Fontenoy Earth AI Joint Venture A highly prospective and underexplored area for PGE, Ni, Au and Cu mineralisation with significant drill intercepts. Figure 2. Location summary of Legacy Minerals’ Projects in NSW, Australia, and major mines and deposits. ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 7 of 8 Appendix 1 Table 3. NiCo Young Project Inferred Mineral Resource by prospect and cut-off grade (ASX release 1 July 2025). Cut-off Prospect Classification Tonnes (Mt) Ni (%) Co (%) Contained Ni (kt) Contained Co (kt) 0.6% NiEq Ardnaree Inferred 53.6 0.66 0.05 355.6 24.6 0.6% NiEq Thuddungra Inferred 114.3 0.56 0.06 641.1 72.0 0.6% NiEq Total Inferred 167.8 0.59 0.06 996.7 96.6 1.0% NiEq Ardnaree Inferred 14.5 0.88 0.07 127.6 10.3 1.0% NiEq Thuddungra Inferred 27.9 0.76 0.10 211.2 27.7 1.0% NiEq Total Inferred 42.5 0.80 0.09 338.8 38.0 Notes: Minor differences may occur due to rounding. The 1.0% NiEq cut-off figures are a higher-grade subset of the 0.6% NiEq cut-off figures and are not additive. Scandium is not included in the current Mineral Resource Estimate. Refer to the ASX release of 1 July 2025 for full supporting notes, the nickel equivalent formula, cut-off grades and JORC Table 1 disclosure. Appendix 2 Table 4. Reported Mineral Resources by classification at major New South Wales nickel-cobalt-scandium deposits. The source announcement of the reporting company for each deposit is given in the Endnotes. Provided for context only. Deposit (Owner) and cut-off Classification Tonnes (Mt) Grade NiCo Young (Legacy Minerals Holdings Limited, ASX: LGM)ii 0.6% NiEq cut-off Measured Not reported Not reported Indicated Not reported Not reported Inferred 167.8 0.59% Ni, 0.06% Co Total 167.8 0.59% Ni, 0.06% Co Sunrise (Sunrise Energy Metals Limited, ASX: SRL)iii 0.35% NiEq cut-off Measured 69 0.65% Ni, 0.11% Co, 61ppm Sc Indicated 89 0.49% Ni, 0.09% Co, 79ppm Sc Inferred 17 0.26% Ni, 0.10% Co, 289ppm Sc Total 180 0.53% Ni, 0.10% Co, 92ppm Sc Syerston scandium (Sunrise Energy Metals Limited, ASX: SRL)iv 300ppm Sc cut-off Measured 5.10 444ppm Sc Indicated 40.83 410ppm Sc Inferred 5.73 364ppm Sc Total 51.66 408ppm Sc Flemington (Australian Mines Limited, ASX: AUZ)v 300ppm Sc cut-off Measured 3.12 455ppm Sc, 1,569ppm Ni, 658ppm Co Indicated 3.02 441ppm Sc, 1,147ppm Ni, 544ppm Co Inferred 0.15 371ppm Sc, 906ppm Ni, 588ppm Co Total 6.30 446ppm Sc, 1,350ppm Ni, 601ppm Co Burra / Platina Scandium (Rio Tinto; previously Platina Resources Limited, ASX: PGM)vi 300ppm Sc cut-off Measured 7.8 435ppm Sc, 0.13% Ni, 0.07% Co, 0.42g/t Pt Indicated 12.5 410ppm Sc, 0.11% Ni, 0.06% Co, 0.26g/t Pt Inferred 15.3 380ppm Sc, 0.08% Ni, 0.05% Co, 0.22g/t Pt Total 35.6 405ppm Sc, 0.10% Ni, 0.06% Co, 0.28g/t Pt Nyngan (Scandium International Mining Corp., TSXV: SCY)vii 100ppm Sc cut-off Measured 5.69 256ppm Sc Indicated 11.23 225ppm Sc Inferred Nil Not reported Total 16.92 235ppm Sc Broken Hill Cobalt Project (Cobalt Blue Holdings Measured 23.7 917ppm Co, 9.6% S, 170ppm Ni ASX: LGM SIGN UP TO LEGACY MINERALS’ INTERACTIVE INVESTOR HUB Page 8 of 8 Deposit (Owner) and cut-off Classification Tonnes (Mt) Grade Limited, ASX: COB)viii 275ppm CoEq cut-off Indicated 59.9 644ppm Co, 7.0% S, 126ppm Ni Inferred 43.0 629ppm Co, 7.0% S, 127ppm Ni Total 126.5 690ppm Co, 7.5% S, 134ppm Ni Notes: All figures in Table 4 were previously reported by the companies named, and are reproduced for context only. The source announcement for each deposit is referenced in the Endnotes. The Company confirms it is not aware of any new information or data that materially affects the information included in those announcements. Totals may not sum exactly because of rounding applied by the reporting company. Peer deposits are not necessarily analogous to the NiCo Young deposit. Nyngan: the estimate is reported under Canadian National Instrument 43-101 and is not reported in accordance with the JORC Code; a Competent Person has not done sufficient work to classify it as a Mineral Resource in accordance with the JORC Code, and it is uncertain that following further evaluation or exploration work a Mineral Resource will be able to be reported in accordance with the JORC Code. Nyngan reports no Inferred Mineral Resource and does not disclose contained metal. Burra: Rio Tinto has not published a Mineral Resource estimate since acquiring the project in April 2023, and the figures shown are those last reported by Platina Resources Limited. All other estimates are reported in accordance with the JORC Code 2012. Endnotes i LGM ASX Release, 1 July 2025, NiCo Young Mineral Resource Estimate Review. ii LGM ASX Release, 1 July 2025, NiCo Young Mineral Resource Estimate Review. iii SRL ASX Release, 28 September 2020, lodged under the company’s former name, Clean TeQ Holdings Limited. iv SRL ASX Release, 9 September 2025, Update to Scandium Mineral Resource. v AUZ ASX Release, 8 January 2025, Flemington Resource Expands Significantly. vi PGM ASX Release, 16 August 2018, Owendale Measured, Indicated and Inferred Mineral Resource, as restated in Platina Resources Limited 2023 Annual Report, 27 September 2023. Rio Tinto has not published a Mineral Resource estimate since acquiring the project in April 2023. vii SCY NI 43-101 Technical Report, effective 15 April 2016, Feasibility Study – Nyngan Scandium Project. Not reported in accordance with the JORC Code. viii COB ASX Release, 30 November 2023, BHCP Resource Update, as restated in Cobalt Blue Holdings Limited 2025 Annual Report, 26 September 2025.