Announcement PDF An Emerging Standalone Gold Producer International Mining and Resources Conference | 21 October 2025 Important disclaimers Nature of Document This Presentation is provided on the basis that neither the Company nor its respective officers, shareholders, related bodies, corporate, partners, affiliates, employees, representatives or advisers, make any representation or warranty (express or implied) as to the accuracy, reliability, relevance or completeness of the material it contains. Nothing contained in the Presentation is, or may be relied upon, as a promise, representation or warranty, whether as to the past or the future, and the Company hereby excludes all warranties that can be excluded by law. The Presentation The presentation contains ‘forward-looking statements’. By their nature, forward-looking statements involve known and unknown risks, uncertainties and other factors because they relate to events and depend on circumstances that may or may not occur in the future, and assumptions which may or may not prove to be correct (and may be beyond the Company’s ability to control or predict), any (or all) of which may cause the actual results or performance of the Company to be materially different from the results or performance expressed or implied by such forward-looking statements. No representation is made that any forward-looking statement will come to pass, that any forecast result will be achieved, or that any assumption on which a forward-looking statement is based is reasonable. Forward- looking statements are made as at the date of this Presentation, and the Company disclaims any obligation or undertaking to release any update of, or revision to, any forward-looking statement contained in this Presentation. contains information relating to Mineral Resources estimates and Ore Reserves estimates. All persons reviewing this Presentation should refer to the JORC resource statements and competent person confirmations in the Appendix to this Presentation (Slide 22). Professional Advice recommended All persons reviewing this Presentation should consider seeking appropriate professional advice before making any investment decision. Neither the provision of the Presentation nor any information contained in the Presentation or subsequently communicated to any person in connection with the Presentation is, or should be taken as, constituting the giving of investment advice to any person. Forward Looking and Cautionary Statement As noted above, some statements in this Presentation regarding estimates or future events are forward looking statements. They include indications of, and guidance on, future earnings, cash flow, costs and financial performance. Forward looking statements include, but are not limited to, statements preceded by words such as “planned”, “expected”, “projected”, “estimated”, “may”, “scheduled”, “intends”, “anticipates”, “believes”, “potential”, “could”, “nominal”, “conceptual” and similar expressions. Forward looking statements, opinions and estimates included in this Presentation are based on assumptions and contingencies which are subject to change without notice, as are statements about market and industry trends, which are based on interpretations of current market conditions. Forward looking statements are provided as a general guide only and should not be relied on as a guarantee of future performance. Forward looking statements may be affected by a range of variables that could cause actual results to differ from estimated results, and may cause the Company’s actual performance and financial results in future periods to materially differ from any projections of future performance or results expressed or implied by such forward looking statements. These risks and uncertainties include but are not limited to liabilities inherent in mine development and production, geological, mining and processing technical problems, the inability to obtain any additional mine licenses, permits and other regulatory approvals required in connection with mining and third party processing operations, competition for among other things, capital, acquisition of reserves, undeveloped lands and skilled personnel, incorrect assessments of the value of acquisitions, changes in commodity prices and exchange rate, currency and interest fluctuations, various events which could disrupt operations and/or the transportation of mineral products, including labour stoppages and severe weather conditions, the demand for and availability of transportation services, the ability to secure adequate financing and management’s ability to anticipate and manage the foregoing factors and risks. There can be no assurance that forward looking statements will prove to be correct. Statements regarding plans with respect to the Company’s mineral properties may contain forward looking statements in relation to future matters that can only be made where the Company has a reasonable basis for making those statements. The forward looking statements in this Presentation are based on current expectations, estimates, forecasts and projections about the Company and the industry in which it operates. They do, however, relate to future matters and are subject to various inherent risks and uncertainties. Actual events or results may differ materially from the events or results expressed or implied by any forward looking statements. The past performance of the Company is no guarantee of future performance. You are cautioned not to place undue reliance on any forward looking statement. The forward looking statements in this Presentation reflect views held only as at the date of this Presentation. None of Horizon Minerals Limited or its directors, officers, employees, agents or contractors makes any representation or warranty (either expressed or implied) as to the accuracy or likelihood of fulfilment of any future looking statement, or any events or results expressed or implied in any forward looking statement, except to the extent required by law. The Company believes that it has a reasonable basis for making the forward looking statements in the Presentation, including with respect to any production targets and financial estimates, based on the information contained in this and previous ASX announcements. Aspirational Statement The Company’s vision to be a ~100kozpa producer in this presentation are aspirational statements (and not a production targets) and the Company does not have reasonable grounds to believe this can be achieved. These statements are of an aspiration nature as the vision to be a ~100kozpa producer is dependent on several factors including the exploration success, ore reserves and mineral resources definition, feasibility studies and development of an extended mine plan. Authorised for release to the ASX by the Board of Directors of Horizon Minerals Ltd. 2 Investment proposition Currently producing gold and cash flow through a combination ore purchase and toll treatment agreements An attractively priced West Australian gold developer with near-term growth Esperance Albany Geraldton Perth Black Swan Processing Plant 2.2Mtpa (currently in C&M) with pathway to refurbish / convert to gold processing Mineral Resource* Estimate 1.8Moz 29.62Mt @ 1.85g/t Au Regional Landholding +1,300km² Projects 3 20.2Moz Ag 104kt Zn Carnarvon Undertaking a Pre-Feasibility Study on converting the wholly owned Black Swan nickel processing plant for gold production based on an initial +5 year mine plan Expedited, low capital pathway to becoming a standalone, high margin gold producer in the WA Goldfields Targeting first gold production at Black Swan by early 2027 Major drilling program underway to better define and extend mineable ounces from the 1.8Moz MRE and test new regional targets Kalgoorlie 1.5Mtpa (currently in C&M) with potential to refurbish / convert Lake Johnstone Processing Plant * See Table on page 24. Horizon Minerals – at a glance An attractively priced West Australian gold developer with near-term growth Capital structure Units Current Share price $/sh 0.081(1) Ordinary shares M 2,994.7 Options and performance rights M 40.4 Market capitalisation $M 242.5 Cash and cash equivalents $M 34.4(2) Debt $M 1.7(2) Enterprise value $M 209.8 1. As at 20 October 2025. 2. As at 30 September 2025. Excludes listed investments with a value of ~$1.6M. 3. As at 30 June 2025. 4. Commencing January 2026. Board and Management Ashok Parekh Non-Executive Chair Grant Haywood Managing Director Warren Hallam Non-Executive Director Brendan Shalders4 Chief Financial Officer Rob Waugh Non-Executive Director Stephen Guy Chief Geologist High net worth, retail and other 4 0 20 40 60 80 100 $0.00 $0.02 $0.04 $0.06 $0.08 $0.10 Oct-24 Dec-24 Feb-25 Apr-25 Jun-25 Aug-25 Oct-25 Million Volume Price Golden Crane Holdings Directors and Management Institutions Indicative Share Register3 *Indicative Our strategy An attractively priced West Australian gold developer with near-term growth Late 2026 onwards Commence gold production at Black Swan by early 2027 Now Generate cash flow using third party plant and infrastructure for gold production Next 12 months Complete Black Swan refurbishment and conversion for gold processing All elements in place to support aspirational target to become a ~100kozpa producer* Production Growth Studies Upgrade and extend Mineral Resources to support a +5 year mine plan Extend initial +5 year mine life through exploration and consolidation Continue to grow Mineral Resources and drill test new exploration targets Refurbishment and conversion studies for Black Swan Complete studies on potential Nimbus silver and zinc production at Black Swan Improve PFS outcomes through the inclusion of updated Burbanks MRE 5 *This is an aspirational statement (and not a production target), the Company does not yet have reasonable ground to believe the vision can be achieved. Refer to the Aspirational Statements section in the Disclaimers section of this presentation for further information. Standout combination of value and growth Attractive valuation relative to ASX-listed gold development peers $521 $324 $299 $295 $235 $226 $225 $194 $183 $169 $139 $138 $136 $117 $113 $61 MEK MI6 MM8 WA8 GG8 BTR AAR MAU AZY AUC GBR HRZ STN MAT PTN HRN (1) As at 15 October 2025. References contained in Appendices. Australian gold project developers market capitalisation / MRE ounce1 6 Portfolio overview A 1.8Moz Mineral Resource* with processing infrastructure and growth * See Table on page 24. Project portfolio • Large 1,309km2 land package in an attractive geological setting centred around Kalgoorlie / Coolgardie • Current 1.8Moz Group Mineral Resource* (29.62Mt @ 1.85g/t AU) with ~50% contained within the cornerstone Burbanks and Boorara deposits • Reinvigorated exploration strategy focused on defining and extending mineable ounces to deliver a robust initial 5-year mine plan in the upcoming PFS • Acquisition of the 2.2Mtpa Black Swan processing facility in February 2025 will provide a standalone processing hub to unlock the value of the significant resources base • Additional value and optionality from the Nimbus silver-zinc deposit (contains 20.2Moz Ag, 104kt Zn, and 77koz Au) located 44km from Black Swan Strategically constructed gold exploration portfolio centered around major geological structures 8 * See Table on page 24. Boorara Gold Project Production • Located 15km east of Kalgoorlie, next to the Super Pit • Producing gold under a Binding Ore Sale Agreement (OSA) with the Paddington mill since late 2024 • Treatment to date of 543.7kt for 14,158oz sold, generating revenue of ~$73.7M (unaudited)1 • Surface ore stockpile of ~320kt1 established • Current gold price of ~$6,700/oz and ~600kt remains to be processed under the existing OSA Pre-Feasibility Study • Mineral Resource* Estimate after mining depletion of 9.8Mt @ 1.27g/t Au for 398.2koz • Base load feed for Black Swan in the upcoming PFS mine plan • Significantly de-risked project through the current mining and processing operations • Potential remains to further extend the deposit Cash flow and future baseload open pit feed 9 (1) As at 30 September 2025. * See ASX Announcement "Quarterly Activities Report" dated 30 September 2025. PRODUCTION Phillips Find • Located 45km north-northwest of Coolgardie • Multiple moderate grade open pit deposits with a combined Mineral Resource* of 0.59kt @ 2.36g/t Au for 45.2koz • Low financial risk Joint Venture (JV) with contractor BML Ventures Pty Limited to fund and manage mining operations • Approximately 100kt of ore processed at FMR Investments Greenfields mill under toll milling agreement between the January and September quarter 2025, generating $25.9M revenue to the JV1 • Mining and processing expected to be completed with final JV distributions paid in the current December 2025 quarter Generating cash flow from local toll milling (1) For full exploration and production details, refer to ASX announcements dated 13 May 2024, 7 August 2024, 31 March 2025 and 29 April 2025, 31 July 2025 and 20 October 2025. * See Table on page 24. 10 PRODUCTION Black Swan processing plant • Comminution circuit suitable for gold processing after refurbishment and addition of a carbon in leach (CIL) circuit • Highly capital efficient plan by leveraging existing infrastructure with estimated replacement value of +$150M • Processing capacity of up to 2.2Mtpa with plans to initially operate at a 1.5Mtpa throughput1 • All requisite mining, regulatory and environmental approvals in place with dedicated grid power and water access • Several third- party deposits within trucking distance of Black Swan, along with several prospective greenfields targets2 • GR Engineering appointed to lead engineering study on the mill refurbishment and conversion PFS due for completion in the December quarter 2025 • Conversion retains future ability to process base metal ores Strategically located concentrator ~40km north of Kalgoorlie 11 PROCESSING (1) The 1.5Mtpa is a throughput and should not be construed as a production target, see Disclaimers and Forward- Looking Statements on Slide 2. Black Swan process facility Existing flotation circuit and planned changes to facilitate gold production Crush Grind Carbon in leach Elution Gold room Au Flotation Ag/Zn + Ni Concentrates REFURBISHMENT GOLD CONVERSION FUTURE REFURBISHMENT OPTION 12 PROCESSING Burbanks project • Located on a granted Mining Lease 9km south of Coolgardie • Historic underground mining produced 324koz @ 22.7g/t Au • Large 465.5koz open pit and high-grade underground Mineral Resource* • Significant extension potential with only 30% of the upper 500m mineralised horizon tested to date1 • Last 10,000m drill program in 2023 added 188koz to the Mineral Resource** • First results from ~30,000m drilling program received including 1.55m @ 99.6g/t Au and 1m @ 37.2g/t Au2 • Mineral Resource upgrade planned for 2026 before expected inclusion of Burbanks into the PFS mine plan High-grade cornerstone asset with 30,000m of infill and extensional drilling well underway Resource Category Cut-off Indicated Inferred Total Mt Au g/t Oz Mt Au g/t Oz Mt Au g/t Oz Burbanks OP 0.5 1.43 2.00 92,780 3.43 1.90 204,870 4.86 1.90 297,650 Burbanks UG 2.5/2.0 0.12 4.30 16,730 1.07 4.40 151,190 1.19 4.40 167,920 Burbanks Mineral Resource Estimate GROWTH 13 (1) Refer to Greenstone Resources ASX announcement “Global Gold Resource Increases 57% to 520,134 oz” dated 5 July 2023 for all exploration details and see confirmations on slide 27. (2) Refer to ASX announcement dated 6 October 2025: “Burbanks Drilling Returning Spectacular Grades”. * See Table on page 24. ** See ASX asnnoucement (ASX:GRS) titled “High-Grade Intercepts Extends Potential at Burbanks” dated 5October 2023. Black Swan exploration potential • Previous exploration largely targeting nickel sulphide mineralisation – only 5% of drill assays have tested for gold • Target areas adjacent to the Mt Monger fault which is associated with several regional gold mining operations • Gold prospectivity of the Black Swan area demonstrated with drill intersections grading up to 6.41g/t Au1 • Wide-spaced soil sampling program completed over the entire Black Swan tenement package in August 20241 • Numerous gold nuggets located1 • Identified a new 6.5km-long gold trend around Black Swan • The most coherent anomaly, located at Wilson’s (North Anomaly), is 1.4km by 1km in size and immediately north of the existing nickel mines and associated infrastructure • Initial 2,000m drill program planned for early 2026 Untested gold anomalies emerging adjacent to the process plant infrastructure 14 GROWTH 1. Refer to ASX announcement (ASX:POS) "Gold Potential Builds at Black Swan" dated 24 September 2024. Nimbus silver-zinc deposit • Mineral Resource* containing 20.2Moz silver and 104kt zinc • High-grade lode containing 6.4Moz silver (774g/t Ag) and 33kt zinc (12.8% Zn) • Potential to extend mineralisation along strike and at depth below 400m • Located adjacent to the Boorara gold deposit with shared infrastructure • Historical production of 3.6Moz of high-grade silver (352g/t Ag) • Potential to produce a high-grade silver-zinc concentrate through the existing Black Swan flotation circuit • Further economic studies to maximise future optionality to be completed A high-grade silver-zinc VHMS deposit on the edge of Kalgoorlie 15 GROWTH * See Table on page 26. Strong pipeline to support Black Swan Horizon’s 30Mt of existing gold Resources with ~50,000m of drilling budgeted in FY25/261 Greenfields Advanced drilling target Resource definition & expansion Operations Boorara Rose Hill Teal Coote Crake Burbanks Penny’s Find Wilson’s Phillips Find Cannon Kalpini Greater Boorara ~480koz ~700koz ~300koz Black Swan Ni Nimbus Zn/Ag Base metal project Notes: (1) Expected to be funded by free cash flows from Boorara and Phillip’s Find. 16 Platform for regional consolidation • Opportunities for non-producers to access third party gold processing infrastructure in the WA Goldfields is becoming increasingly difficult • Conversion of a 2.2Mtpa processing facility1 to gold production has potential to unlock stranded gold resources in the region • Potential to partner with third parties via joint venture, toll milling, and ore purchase arrangements • Further scope to unlock value through asset sales or corporate transactions • Horizon will assess these opportunities to add mine life which are accretive to Horizon shareholders >Several deposits of gold resources in region are without a clear processing solution 17 GROWTH 1. The 2.2Mtpa is the nameplate throughput of the plant and should not be construed as a production target, see Disclaimers and Forward- Looking Statements on Slide 2. Lake Johnston process plant • Located 185km southwest of Kalgoorlie • 1.5Mtpa nickel concentrator and associated infrastructure amenable to processing lithium or conversion for gold processing • Accommodation camp with 200-person capacity and airstrip • Mining, regulatory and environmental approvals in place • The only minerals processing facility within +100km with an estimated +$100M replacement value • Asset well maintained under care and maintenance program • Prior to Horizon ownership, in 2024, Mineral Resources (ASX:MIN) entered into a binding Heads of Agreements to acquire the assets for $15M before terminating the agreement1 • Exploration potential within 86km2 landholding including a coherent gold-in-soil anomaly at Billy Ray measuring 1.2km by 0.9km, with peak gold value of 146ppb Au2 Strategic infrastructure with significant optionality in an emerging gold and lithium province 18 (1) Refer to ASX announcements (ASX: POS, MIN) dated 18 March 2024 and (ASX: POS) 9 May 2024. (2) Refer to ASX Announcement (ASX: POS) "Update on Gold Exploration Programs" dated 30 July 2014. Operational timeline Indicative timeline of upcoming cash flow and pathway to gold from Black Swan Target key workstreams CY 2025 CY 2026 CY 2027 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Boorara gold production Phillips Find gold production Additional toll treatment/ore sales Black Swan conversion studies Black Swan refurb & conversion work Mining studies Black Swan gold processing 19 An Emerging Standalone Gold Producer Pre-Feasibility Study and exploration to establish and grow a +5 year mine plan Cash flow generation from gold produced at Boorara and Phillips Find Combination of 1.8Moz of Mineral Resource* and processing infrastructure Balance sheet will continue to strengthen and fund growth plans Credible, low capex plan to standalone gold production by early 2027 Ramp up of production aligned with record gold prices of $6,700/oz Au Highly experienced Board and Management with strong regional expertise Attractive current valuation relative to peers, with growth and re-rating potential 20 * See Table on page 24. Contact Us Grant Haywood Managing Director and CEO +61 (08) 9386 9534 admin@horizonminerals.com.au horizonminerals.com.au PO Box 1064 West Perth WA 6872 Appendices Peers Comparison – Reference Table Company ASX Contained Au (Moz) Resource Grade (g/t) Measured (Mt) Indicated (Mt) Inferred (Mt) Stage of Development / Study Completed Share Price Shares (M) Market Cap Market Cap / Cont. Au Reference Meeka Metals MEK 1.24 3.0 0.2 8.2 4.7 Scoping Study $0.22 2,922.3 $643 $521 https://api.investi.com.au/api/announcements/mek/673842db-a19.pdf Minerals 260 MI6 2.30 1.2 0 39.0 21.0 Resource Development $0.36 2,067.3 $744 $324 https://api.investi.com.au/api/announcements/mi6/5a2bb3d1-803.pdf Medallion Metals MM8 1.10 3.3 0 6.4 3.8 Scoping Study $0.54 613.4 $328 $299 https://wcsecure.weblink.com.au/pdf/MM8/03007527.pdf Warriedar Resources WA8 1.04 1.6 2.7 4.8 19.8 Resource Development $0.26 1,197.3 $305 $295 https://warriedarresources.com.au/announcements/7069690 Gorilla Gold Ltd GG8 1.22 4.3 0 1.8 7.1 Resource Development $0.45 646.2 $288 $235 https://wcsecure.weblink.com.au/pdf/GG8/03007493.pdf Brightstar Resources BTR 1.553 1.5 0 6.097 27 Resource Development $0.61 579.3 $350 $226 https://aurumin.com.au/wp-content/uploads/61270636.pdf Astral Resources AAR 1.76 1.1 0 36.0 14.0 Pre-Feasibility Study $0.28 1,440.2 $396 $225 https://investorhub.astralresources.com.au/announcements/7159459 Magnetic Resources MAU 2.32 1.8 0 29.1 11.6 Feasibility Study $1.52 295.3 $449 $194 https://wcsecure.weblink.com.au/pdf/MAU/02958984.pdf Antipa Minerals AZY 2.52 1.5 0 32.4 20.7 Scoping Study $0.71 649.7 $458 $182 https://antipaminerals.com.au/upload/documents/investors/asx- announcements/250909034110_26-09-09- PMSConferenceInvestorPresentationLowResvforASX.pdf Ausgold Ltd AUC 2.44 1.1 41.6 21.2 5.9 Definitive Feasibility Study $0.96 430.6 $413 $169 https://api.investi.com.au/api/announcements/auc/bd813021-134.pdf Great Boulder Resources GBR 0.67 2.8 0 3.2 4.3 Scoping Study $0.09 1,040.6 $93 $139 https://wcsecure.weblink.com.au/pdf/GBR/02994064.pdf Horizon Minerals HRZ 1.82 1.8 1.3 15.8 13.8 Pre-Feasibility Study $0.08 2,994.7 $252 $138 Saturn Metals Ltd STN 2.24 0.5 4.8 107.4 24.8 Preliminary Economic Assessment $0.58 529.4 $304 $136 https://saturnmetals.com.au/wp-content/uploads/2025/07/250718- Apollo-Hill-Gold-Resource-Update-July-2025-2.24Moz.pdf Matsa Resources MAT 0.95 2.5 0.2 4.1 7.3 Feasibility Study $0.14 820.6 $111 $117 https://api.investi.com.au/api/announcements/mat/9747ee07-715.pdf Patronus Resources PTN 1.24 1.4 0.4 12.1 12.5 Resource Development $0.10 1,479.3 $141 $113 https://app.sharelinktechnologies.com/announcement- preview/asx/af596150487f82cd74b76cd766f2e472 Horizon Gold Ltd HRN 2.14 1.5 0 28.2 16.3 Scoping Study $0.77 169.6 $131 $61 https://wcsecure.weblink.com.au/pdf/HRN/02969197.pdf ASX-listed Gold Developers Mineral Resource* Estimate Gold projects Project Cutoff Measured Indicated Inferred Total Au g/t Mt Au g/t Oz Mt Au g/t Oz Mt Au g/t Oz Mt Au g/t Oz Boorara OP 0.5 0.75 1.21 29,200 6.48 1.28 266,000 2.55 1.26 103,000 9.79 1.27 398,200 Burbanks OP 0.5 - - - 1.43 2.02 92,800 3.43 1.86 204,900 4.86 1.90 297,700 Burbanks UG 2.5/2.0* - - - 0.12 4.26 16,700 1.07 4.39 151,200 1.19 4.38 167,900 Phillips Find OP 0.5 - - - 0.41 2.54 32,700 0.19 2.10 12,500 0.59 2.36 45,200 Phillips Find UG 2 - - - - - - 0.00 2.27 208 0.00 2.27 208 Golden Ridge 1 - - - 0.48 1.82 27,900 0.05 1.71 2,800 0.53 1.81 30,700 Golden Ridge North 0.8 - - - 0.65 1.15 24,300 0.77 1.30 32,300 1.43 1.23 56,600 Cannon UG 1 - - - 0.19 4.80 28,600 0.05 2.28 3,500 0.23 4.29 32,100 Monument 0.5 - - - - - - 0.92 1.11 32,800 0.92 1.11 32,800 Pinner 0.5 - - - 0.06 1.02 2,100 0.27 1.25 10,800 0.33 1.21 12,800 Pennys Find 1.5 - - - 0.31 5.19 51,000 0.12 3.02 12,000 0.43 4.57 63,000 Kalpini 0.8 - - - 1.40 2.41 108,600 0.47 2.03 30,700 1.87 2.31 139,300 Rose Hill UG 2 - - - 0.33 4.49 47,100 0.18 4.78 27,800 0.51 4.60 74,900 Rose Hill OP 0.5 0.19 1.96 12,300 0.09 2.05 6,100 - - - 0.29 1.99 18,300 Jacques-Peyes 0.8 - - - 0.97 2.59 80,700 0.77 1.98 49,200 1.74 2.32 129,800 Teal 1 - - - 1.01 1.96 63,700 0.80 2.50 64,500 1.81 2.20 128,100 Crake 0.8 - - - 1.33 1.47 63,100 0.08 1.27 3,400 1.42 1.46 66,500 Coote 1 - - - - - - 0.42 1.54 21,000 0.42 1.54 21,000 Capricorn 0.5 - - - - - - 0.66 1.20 25,500 0.66 1.20 25,500 Baden Powell 0.5 - - - - - - 0.60 1.20 23,000 0.60 1.20 23,000 Gordons Dam 1.0 - - - - - - 0.36 1.70 20,000 0.36 1.70 20,000 Total 0.95 1 .36 41,500 15.26 1.86 911,200 13.78 1.88 830,700 29.98 1.85 1,783,400 24 *Refer to ASX announcement 29 April 2025, 11 August 2025 and 20 October 2025 and see confirmations on page 27. Horizon confir ms that all material assumptions included in the initial announcements dated 29 April 2025, 11 August 2025 and 20 October 2025 continue to apply and have not materially changed. Ore Reserve* Estimate Gold projects Category Tonnes (kt) Au (g/t) Gold Metal (koz) Proven Reserve – – – Probable Reserve 135.0 4.1 17.7 Total Reserve 135.0 4.1 17.7 Location Reserve Category Tonnes (kt) Au (g/t) Gold Metal (kOz) Boorara Open Pit Proved 382.0 1.23 15.1 Probable 405.3 1.24 16.1 Total 787.3 1.24 31.3 Boorara Ore Reserve Cannon Ore Reserve Location Reserve Category Tonnes (kt) Au (g/t) Gold Metal (kOz) Penny’s Find UG Proven – – – Probable 328.3 3.2 33.4 Total 328.3 3.2 33.4 Penny’s Find Ore Reserve 25 * Refer to ASX announcements 29 March 2022, 1 August 2024, 18 December 2024 and 20 October 2025 and see confirmations on page27. Horizon confirms that all material assumptions included in the initial announcements dated 29 March 2022, 1 August 2024, 18 December 2024 and 20 October 2025 continue to apply and have not materia lly changed. Mineral Resource* Estimate Nimbus silver-zinc project Nimbus All Lodes (bottom cuts 12 g/t Ag, 0.5% Zn, 0.3g/t Au) Category Mt Ag (g/t) Au (g/t) Zn (%) Ag (Moz) Au (kt) Zn (kt) Measured Resource 3.62 102 0.09 1.2 11.9 10 45 Indicated Resource 3.18 48 0.21 1.0 4.9 21 30 Inferred Resource 5.28 20 0.27 0.5 3.4 46 29 Total Resource 12.08 52 0.20 0.9 20.2 77 104 Nimbus high grade silver zinc resource (500g/t Ag bottom cut and 2,800g/t Ag top cut) Category Mt Ag (g/t) Zn (%) Ag (Moz) Zn (kt) Measured Resource - - - - - Indicated Resource 0.17 762 12.8 4.2 22 Inferred Resource 0.09 797 13.0 2.2 11 Total Resource 0.26 774 12.8 6.4 33 * Refer to ASX announcement 1 August 2024 and see confirmations on page 27. 26 Mineral Resource & Ore Reserve disclosure Horizon’s Gold Mineral Resources The information in this report that relates to Horizon’s Mineral Resources estimates is extracted from and was originally reported in Horizon’s ASX announcements: “Annual Report 2025” 20 October 2025, “Updated Boorara Mineral Resource Delivers a 34% Increase in Gold Grade” (Boorara) 27 April 2021, “Group Mineral Resource Statement – Amended” (Burbanks, Phillips Find) 1 August 2024, “High Grade Drill results and Resource Update for Rose Hill” (Rose Hill, Golden Ridge) 4 February 2020, “Maiden Resources for Monument and Golden Ridge North” (Golden Ridge North) 19 July 2023, “Investor Presentation June 2022” (Cannon) 31 May 2022, “Group Mineral Resource Statement – Amended” (Monument, Pinner) 1 August 2024, “Pennys Find Resource Update” (Pennys Find) 29 December 2023, “Kalpini Gold Project Mineral Resource Update” (Kalpini) 28 September 2021, “Jacques Find - Peyes Farm Mineral Resource update” (Jaques-Peyes) 15 September 2021, “Intermin’s Mineral Resources Grow 30% to over 560,000 Ounces” (ASX:IRC) (Teal) dated 19 September 2018, “Updated Crake Resource improves in quality” (Crake) 7 September 2021, “Gold resources increase to 1.24moz” (Coote, Capricorn, Baden Powell) dated 28 September 2022, “Acquisition of Projects Near Black Swan Including Gordons Dam Project - Amended”, (Gordons Dam) dated 11 August 2025, each of which is available at www.asx.com.au. Horizon confirms that it is not aware of any new information or data that materially affects the information included in the original market announcements and that all material assumptions and technical parameters underpinning exploration results and the estimates in those announcements continue to apply and have not materially changed. The Company confirms that the form and context of the Competent Person’s findings in relation to those Mineral Resources estimates or Ore Reserves estimates have not been materially modified from the original market announcements. Non-gold Mineral Resources The information is this Presentation that relates to Horizon’s exploration results and Mineral Resources estimates was originally reported in Horizon’s ASX announcement: “Nimbus Silver Update” (Nimbus, Nimbus Expl Trgt) 28 August 2024 which is available at www.asx.com.au. Horizon confirms that the form and context of the Competent Person’s findings in relation to those Mineral Resources estimates have not been materially modified from the original market announcements. Gold Ore Reserves The information in this report that relates to Horizon’s Ore Reserves is extracted from and was originally report