Announcement PDF 25 August 2026 Numerous significant intercepts returned from Howards, Heron South and Melbourne Bitter RC Drilling HIGHLIGHTS  RC drilling at Howards has confirmed an 800-metre southern extension to known gold mineralisation. Significant intercepts included:  6m @ 5.57g/t Au from 70m including 3m @ 9.91g/t Au from 71m  9m @ 2.27g/t Au from 41m including 5m @ 3.54g/t Au from 41m  4m @ 4.65g/t Au from 70m including 1m @ 17.30g/t Au from 70m  5m @ 3.41g/t Au from 29m including 3m @ 5.41g/t Au from 30m  10m @ 1.55g/t Au from 49m including 4m @ 3.28g/t Au from 50m  Infill and extension RC drilling at Heron South returned the following intercepts:  6m @ 12.67g/t Au from 114m including 1m @ 58.70g/t Au from 114m  25m @ 1.79g/t Au from 84m including 4m @ 7.87g/t Au from 93m  12m @ 2.35g/t Au from 180m including 7m @ 3.50g/t Au from 180m  21m @ 1.26g/t Au from 141m including 7m @ 2.55g/t Au from 145m  16m @ 1.42g/t Au from 185m including 4m @ 2.89g/t Au from 195m  14m @ 1.56g/t Au from 165m including 6m @ 2.87g/t Au from 170m  14m @ 1.48g/t Au from 82m including 3m @ 4.51g/t Au from 86m  17m @ 1.19g/t Au from 96m including 7m @ 2.46g/t Au from 103m  10m @ 1.55g/t Au from 145m including 3m @ 2.69g/t Au from 149m  Shallow infill and extensional RC drilling at Melbourne Bitter returned the following significant intercepts and highlighted the potential for significant resource expansion to the south of the existing gold resource:  21m @ 2.14g/t Au from 24m including 8m @ 3.64g/t Au from 31m  11m @ 1.78g/t Au from 35m including 4m @ 3.91g/t Au from 36m  12m @ 1.59g/t Au from 68m including 4m @ 3.87g/t Au from 75m  7m @ 2.31g/t Au from 49m including 1m @ 13.10g/t Au from 50m  11m @ 1.40g/t Au from 27m including 2m @ 3.30g/t Au from 34m  26m @ 0.80g/t Au from 66m including 7m @ 2.06g/t Au from 67m  Follow up RC and diamond drilling is being planned at all 3 prospects  Diamond drilling is continuing at the Swan, Kingfisher and Wilsons deposits, and RC drilling is ongoing across the wider Gum Creek Project area. ________________________________________________________________________________ 2 Horizon Gold Limited (ASX: HRN) (‘Horizon’ or ‘the Company’) is pleased to announce numerous significant gold intercepts returned from RC drilling at its 100% owned Gum Creek Gold Project (‘Gum Creek’ or ‘the Project’) located in the Mid-West Region of Western Australia. Final assay results for Reverse Circulation (RC) drilling completed at Howards, Heron South and Melbourne Bitter have been received. Significant results are outlined below. Figure 1: Gum Creek Gold Project existing Mineral Resources, Potential Mineral Resources and Exploration Targets over simplified geology. Managing Director Scott Williamson said: “The impressive RC drilling results from Howards, Heron South, and Melbourne Bitter are just part of the ongoing RC program that is constantly highlighting the potential for significant resource expansion across the Gum Creek Project. Follow up drilling is being planned at these and various other prospects prior to updating the respective resource estimations, all of which have the potential to enhance the Project economics beyond the recent DFS.” 3 Howards Prospect The Howards Prospect is located ~27km southeast of the historic Gidgee mill. The current MRE for the Howards deposit is 6.85Mt @ 1.11g/t Au for 245,300 (Table A). The resource is currently defined over a 1.3km strike and is up to 50m wide. Gold mineralisation is associated with quartz veining, shearing and silicification within a biotite-silica altered basalt, located along the eastern contact of the Montague granodiorite. The Company completed 17 RC holes for a total of 1,624m. Three holes tested a VRIFY defined prospectivity target ~700m to the northeast of the main Howards mineralised zone, with the remaining holes aimed at extending the current gold resource along strike to the south (Figures 2 & 3, Table C). Significant intercepts (>15 GxM) included:  6m @ 5.57g/t Au from 70m including 3m @ 9.91g/t Au from 71m (HSRC023A)  9m @ 2.27g/t Au from 41m including 5m @ 3.54g/t Au from 41m (HSRC029)  4m @ 4.65g/t Au from 70m including 1m @ 17.30g/t Au from 70m (HSRC025)  5m @ 3.41g/t Au from 29m including 3m @ 5.41g/t Au from 30m (HSRC020)  10m @ 1.55g/t Au from 49m including 4m @ 3.28g/t Au from 50m (HSRC019) The RC drilling intercepted gold mineralisation in every drill hole on 100m spaced drill lines over an 800m strike extension to the south of the existing resource model. The results confirm the potential for a significant resource expansion at Howards. Infill resource drilling is being planned. This drilling will be completed in the coming months prior to an MRE update for the Howards resource later in 2026. 4 Figure 2: Howards drill hole plan showing all drill collars coloured by maximum downhole gold (g/t Au) and recent RC drill intercepts (>1.7 GxM) over interpreted geology. 5 Figure 3: Howards South cross section showing interpreted geology, interpreted mineralised zones and recent significant drill intercepts. One of the three RC holes drilled across a VRIFY prospectivity target returned 2m @ 1.53g/t Au from 64m (HNRC001). The mineralisation is ~300m into the footwall of the Howards mineralisation and could represent an untested footwall lode. Follow-up drilling is being considered. Heron South Prospect The Heron South Prospect is located 15km south-southeast of the historic Gidgee mill and has previously been mined by open cut methods. The current Mineral Resource Estimate (MRE) for the Heron South deposit is 1.48Mt @ 1.66g/t Au for 78,900oz (Table A). The Company completed fifteen RC holes at Heron South for a total of 2,892m (Figure 4). The program aimed to infill gaps in historic drilling at depth and extend mineralisation down dip and along strike to the south of the current resource block model. The drilling returned the following significant intercepts (>15 GxM) (Figures 4 & 5, Table D) confirming the continuity of mineralisation and in some cases returning higher grades at depth, highlighting the potential for further resource expansion down dip and along strike to the south: 6  6m @ 12.67g/t Au from 114m including 1m @ 58.70g/t Au from 114m (HERC035)  25m @ 1.79g/t Au from 84m including 4m @ 7.87g/t Au from 93m (HERC028)  12m @ 2.35g/t Au from 180m including 7m @ 3.50g/t Au from 180m (HERC032)  21m @ 1.26g/t Au from 141m including 7m @ 2.55g/t Au from 145m (HERC029)  16m @ 1.42g/t Au from 185m including 4m @ 2.89g/t Au from 195m (HERC039)  14m @ 1.56g/t Au from 165m including 6m @ 2.87g/t Au from 170m (HERC030)  14m @ 1.48g/t Au from 82m including 3m @ 4.51g/t Au from 86m (HERC037)  17m @ 1.19g/t Au from 96m including 7m @ 2.46g/t Au from 103m (HERC038)  10m @ 1.55g/t Au from 145m including 3m @ 2.69g/t Au from 149m (HERC031) Figure 4: Heron South drill hole plan showing all drill collars coloured by maximum downhole gold (g/t Au) and recent drill hole gold intercepts (>16 GxM) over interpreted geology. 7 Figure 5: Heron South cross section showing significant RC drill intercepts, interpreted mineralised envelopes and A$4,500/oz pit design. Gold mineralisation at Heron South is located within gently north and south plunging east dipping shear zones containing quartz-carbonate-sulphide veins within sericite altered basalt and dolerite units. Two diamond holes are being drilled to obtain structural information to determine controls on high grade plunging shoots and assist the planning of further resource expansion drilling. An updated MRE will be completed once the diamond drilling results have been received. Melbourne Bitter Prospect The Melbourne Bitter deposit is located 26km north of the historic Gidgee Mill. The Melbourne Bitter MRE is currently 0.48Mt @ 1.39g/t Au for 21,300oz (Table A). Twelve RC holes for 1,187m were completed with the aim of infilling previous drilling to a 25m line spacing and extending gold mineralisation to the south of the current resource model. Significant assay results (Figure 6 & 7, Table E) included:  21m @ 2.14g/t Au from 24m including 8m @ 3.64g/t Au from 31m (MBRC054)  11m @ 1.78g/t Au from 35m including 4m @ 3.91g/t Au from 36m (MBRC051)  12m @ 1.59g/t Au from 68m including 4m @ 3.87g/t Au from 75m (MBRC045)  7m @ 2.31g/t Au from 49m including 1m @ 13.10g/t Au from 50m (MBRC054) 8  11m @ 1.40g/t Au from 27m including 2m @ 3.30g/t Au from 34m (MBRC044)  26m @ 0.80g/t Au from 66m including 7m @ 2.06g/t Au from 67m (MBRC054) Results confirmed existing grades and widths of the existing resource and extended mineralisation along strike to the south of the current block model with MBRC054 highlighting the potential for gold mineralisation to increase in width and grade to the south and west of all existing drilling within P53/1702. Shallow RC drilling is required within the highly prospective southern half of the prospecting licence which has not been drilled previously. This drilling will also be completed in the coming months prior to the next Melbourne Bitter MRE update later in 2026. Figure 6: Melbourne Bitter drill hole plan showing all drill collars coloured by maximum downhole gold (g/t Au) and recent gold intercepts over satellite image. 9 Figure 7: Melbourne Bitter cross section showing interpreted mineralised zones and recent significant drill intercepts. About the Company Horizon Gold Limited (ASX: HRN) is an exploration company focused on its 100% owned Gum Creek Project in Western Australia (Figure 8). The Gum Creek Gold Project represents an exciting gold exploration and potential development opportunity that currently contains a Mineral Resource Estimate of 37.97Mt @ 1.89g/t Au for 2.30 million ounces (Table A) including Indicated and Inferred resource classifications in accordance with the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC Code 2012 edition). On 22 July 2026 the Company announced an Open Pit Definitive Feasibility Study1 (DFS) that outlined production, capital and operating costs and a detailed schedule for the engineering, procurement, construction, commissioning and ramp-up of a 2.4Mtpa gold mining and processing facility at the Gum Creek Gold Project. The DFS delivered a maiden Ore Reserve of 18.2Mt at 1.24 g/t Au for 728koz of contained gold reported in accordance with the JORC Code 2012 guidelines. 1 Refer to Horizon Gold Limited ASX Announcement titled “Gum Creek Open Pit DFS Confirms Pathway for WA’s Next Major Gold Mine Development” dated 22 July 2026. 10 It is anticipated the Project will deliver an average gold production of 88koz per annum over an initial 10-year mine life, peaking at 114koz per annum in year two, and delivering a total of 880koz gold recovered over the Life of Mine (LOM) with an AISC of A$2,995/oz. The Open Pit DFS confirms Gum Creek's potential to become Western Australia’s next major gold project development, underpinned by low operating costs, a high-margin production profile and strong growth potential from extensive underground mining opportunities and sulphide ore deposits which currently sit outside the DFS scope. Figure 8: Gum Creek Gold Project and surrounding gold resources and operating gold processing facilities. 11 Horizon Gold Limited Mineral Resources Table A: Gum Creek Gold Resources as at 4 November 20252 Resource Resource Date Cut-off grade (g/t Au) Indicated Inferred Total Tonnes Au (g/t) Gold (oz) Tonnes Au (g/t) Gold (oz) Tonnes Au (g/t) Gold (oz) Swan/Swift OC Nov-25 0.4 6,661,000 1.86 399,000 335,000 1.54 16,600 6,996,000 1.85 415,600 Swan UG* Nov-25 1.5 935,000 4.45 133,700 798,000 3.90 100,000 1,733,000 4.19 233,700 Swift UG* Nov-25 1.5 35,000 2.22 2,500 813,000 2.54 66,300 848,000 2.52 68,800 Wilsons UG* Nov-25 1.5 2,759,000 4.37 387,400 126,000 3.16 12,800 2,885,000 4.31 400,200 Howards Nov-25 0.4 6,095,000 1.13 221,800 751,000 0.97 23,500 6,846,000 1.11 245,300 Kingfisher OC Nov-25 0.6 1,139,000 2.05 75,100 79,000 1.50 3,800 1,218,000 2.01 78,900 Kingfisher UG* Nov-25 1.5 94,000 2.71 8,200 949,000 3.45 105,300 1,043,000 3.38 113,500 Heron May-23 0.6 330,000 2.11 22,400 1,822,000 1.51 88,200 2,152,000 1.60 110,600 Eagle Nov-25 0.4 817,000 1.27 33,400 1,202,000 1.29 50,000 2,019,000 1.28 83,400 Heron South May-23 0.8 720,000 1.79 41,400 761,000 1.53 37,500 1,481,000 1.66 78,900 Shiraz Nov-25 0.4 1,947,000 1.04 65,400 372,000 0.94 11,200 2,319,000 1.03 76,600 Wyooda** Nov-25 0.8 557,000 1.54 27,500 718,000 1.56 36,100 1,275,000 1.55 63,600 Snook Jul-22 0.8 75,000 2.57 6,200 846,000 1.76 47,800 921,000 1.82 54,000 Toedter Nov-25 0.6 905,000 1.31 38,200 99,000 1.32 4,200 1,004,000 1.31 42,400 Hawk Nov-25 0.6 591,000 1.38 26,200 167,000 1.27 6,800 758,000 1.35 33,000 Specimen Well Nov-25 0.6 431,000 1.49 20,600 114,000 1.31 4,800 545,000 1.45 25,400 Wedge Nov-25 0.6 427,000 1.42 19,500 56,000 2.83 5,100 483,000 1.58 24,600 Camel Bore Jul-22 0.8 379,000 1.47 17,900 100,000 1.21 3,900 479,000 1.42 21,800 Melbourne Bitter Nov-25 0.6 318,000 1.46 14,900 157,000 1.27 6,400 475,000 1.39 21,300 Hyperno-Reliance Nov-25 0.6 295,000 1.52 14,400 183,000 1.02 6,000 478,000 1.33 20,400 Kearrys May-23 0.6 450,000 1.24 18,000 46,000 1.35 2,000 496,000 1.25 20,000 Psi Jul-22 0.8 100,000 2.08 6,700 226,000 1.69 12,300 326,000 1.81 19,000 Deep South Reliance Nov-25 0.6 229,000 1.53 11,300 17,000 0.91 500 246,000 1.49 11,800 Orion Jul-22 0.8 69,000 1.49 3,300 182,000 1.40 8,200 251,000 1.43 11,500 Eagles Peak May-23 0.6 264,000 1.19 10,100 41,000 0.99 1,300 305,000 1.16 11,400 Wahoo Jul-22 0.8 - - - 258,000 1.25 10,400 258,000 1.25 10,400 Fangio May-23 0.6 99,000 1.32 4,200 30,000 1.35 1,300 129,000 1.33 5,500 Total 26,721,000 1.90 1,629,300 11,248,000 1.86 672,300 37,969,000 1.89 2,301,600 * Cut-off grades for Swan, Swift, Wilsons and Kingfisher underground Indicated and Inferred are 1.5g/t Au. ** Wyooda includes the Kingston Town, Think Big and Manikato resources which are within 600m and 200m of each other respectively. Note: Figures have been rounded. Table B: Gum Creek Gold Reserves as at 22 July 20263 Notes: Ore Reserves are reported using a A$4,500 gold price basis for cut-off grade calculations Figures have been rounded. 2 Refer to Horizon Gold Ltd ASX announcement titled “Gum Creek Project Gold Resource Update” dated 4 November 2025. 3 Refer to Horizon Gold Limited ASX Announcement titled “Gum Creek Open Pit DFS Confirms Pathway for WA’s Next Major Gold Mine Development” dated 22 July 2026. Deposit Classification Ore Tonnes (Mt) Grade (g/t) Au Metal (koz) Eagle Probable 0.8 0.99 25 Hawk Probable 0.7 1.07 25 Howards Probable 5.8 0.99 186 Hyperno-Reliance Probable 0.3 1.23 12 Kingfisher Probable 1.5 1.51 71 Swan/Swift Probable 8.6 1.42 392 Wedge Probable 0.5 1.04 18 Total Probable 18.2 1.24 728 12 Table C: Significant Drill Hole Intercepts (>2 GxM) – Howards North and Howards South RC Drilling Hole ID East North RL Dip Azi Depth From To Width Au g/t HNRC001 754305 6961699 500 -55 90 80 64 66 2 1.53 HNRC002 754265 6961700 500 -55 90 84 NSI HNRC003 754226 6961700 500 -55 90 80 NSI HSRC018 754340 6959909 496 -55 270 12+ 60 65 5 0.61 incl. 63 65 2 1.06 68 75 7 0.65 incl. 73 75 2 1.40 HSRC019 754334 6959873 496 -55 270 126 49 59 10 1.55 incl. 50 54 4 3.28 73 75 2 1.38 HSRC020 754304 6959829 496 -55 270 80 29 34 5 3.41 incl. 30 33 3 5.41 HSRC021 754344 6959830 496 -55 270 120 50 54 4 1.46 incl. 51 52 1 4.52 59 66 7 0.54 HSRC022 754345 6959790 496 -55 270 120 NSI HSRC023 754335 6959749 496 -55 270 48 42 44 2 3.13 HSRC023A 754333 6959749 496 -55 270 126 70 76 6 5.57 incl. 71 74 3 9.91 HSRC024 754374 6959649 496 -55 270 114 53 60 7 0.35 HSRC025 754395 6959551 496 -55 270 100 25 31 6 0.39 70 74 4 4.65 incl. 70 71 1 17.30 HSRC026 754455 6959450 496 -55 270 100 NSI HSRC027 754496 6959352 496 -55 270 110 64 77 13 0.46 HSRC028 754499 6959254 496 -55 270 70 50 54 4 0.52 HSRC029 754509 6959171 496 -55 270 70 41 50 9 2.27 incl. 41 46 5 3.54 HSRC030 754525 6959130 496 -55 270 70 29 34 5 0.83 incl. 31 33 2 1.53 Notes: All coordinates are GDA94 zone 50, all intercepts use a 0.2 g/t Au lower cut, no upper cut, 2m maximum internal dilution and all intercepts >2.0 GxM are reported. NSI = No Significant Intercept >2.0 GxM. 13 Table D: Significant Drill Hole Intercepts (>2 GxM) – Heron South RC Drilling Hole ID East North RL Dip Azi Depth From To Width Au g/t HERC027 743580 6969187 506 -60 270 165 129 135 6 1.23 incl 129 131 2 2.80 147 150 3 1.44 156 159 3 0.95 HERC028 743562 6969149 507 -57 270 145 84 109 25 1.79 incl. 93 97 4 7.87 HERC029 743586 6969163 506 -60 270 190 141 162 21 1.26 incl. 145 152 7 2.55 HERC030 743604 6969153 506 -60 270 200 165 179 14 1.56 incl. 170 176 6 2.87 HERC031 743587 6969053 506 -60 270 180 32 34 2 1.12 145 155 10 1.55 incl. 149 152 3 2.69 171 173 2 1.66 HERC032 743606 6968977 506 -60 270 198 52 57 5 0.58 75 83 8 0.38 180 192 12 2.35 180 187 7 3.50 HERC033 743639 6968914 506 -60 270 228 211 218 7 0.49 HERC034 743650 6968611 506 -60 270 160 85 87 2 1.54 93 97 4 2.27 incl. 93 94 1 6.91 HERC035 743649 6968662 506 -60 270 150 90 96 6 0.86 incl. 91 93 2 1.96 114 120 6 12.67 incl. 114 115 1 58.70 HERC036 743660 6968637 506 -60 270 170 128 130 2 1.23 HERC037 743641 6968866 506 -60 270 224 51 54 3 2.73 82 96 14 1.48 incl. 86 89 3 4.51 193 197 4 3.35 incl. 193 194 1 11.05 HERC038 743600 6968914 506 -60 270 186 63 74 11 0.33 66 67 1 1.48 80 89 9 0.39 85 86 1 1.34 96 113 17 1.19 incl. 103 110 7 2.46 136 138 2 2.50 HERC039 743628 6968891 506 -60 270 216 62 66 4 0.90 158 160 2 1.52 185 201 16 1.42 incl. 195 199 4 2.89 210 215 5 1.45 HERC040 743612 6968968 506 -65 270 246 NSI HERC041 743626 6968941 506 -63 270 234 198 204 6 1.61 Notes: All coordinates are GDA94 zone 50, all intercepts use a 0.2 g/t Au lower cut, no upper cut, 2m maximum internal dilution and all intercepts >2.0 GxM are reported. NSI = No Significant Intercept >2.0 GxM. 14 Table E: Significant Drill Hole Intercepts (>2 GxM) – Melbourne Bitter RC Drilling Hole ID East North RL Dip Azi Depth From To Width Au g/t MBRC043 736947 7009791 553 -60 77 132 NSI MBRC044 736996 7009753 554 -60 76 76 27 38 11 1.40 incl. 34 36 2 3.30 53 68 15 0.58 incl. 65 67 2 2.64 MBRC045 736955 7009741 553 -60 74 120 57 65 8 0.94 incl. 57 58 1 5.09 68 80 12 1.59 incl. 75 79 4 3.87 MBRC046 737019 7009706 554 -61 73 66 NSI MBRC047 736997 7009700 554 -60 74 126 43 48 5 0.98 incl. 46 48 2 1.83 MBRC048 737024 7009654 554 -60 74 70 NSI MBRC049 737006 7009648 554 -60 76 90 40 54 14 0.47 incl. 45 47 2 1.01 MBRC050 736990 7009594 554 -60 77 127 NSI MBRC051 737045 7009543 555 -61 77 84 0 7 7 0.32 10 18 8 0.80 incl. 12 15 3 1.34 21 24 3 2.24 35 46 11 1.78 incl. 36 40 4 3.91 50 51 1 2.06 60 63 3 1.63 MBRC052 737026 7009538 555 -60 77 110 0 15 15 0.4 11 12 1 1.58 47 58 11 0.48 incl. 53 56 3 1.27 MBRC053 737056 7009524 555 -60 76 78 40 42 2 1.61 MBRC054 737036 7009519 554 -60 78 108 0 5 5 0.55 24 45 21 2.14 incl. 31 39 8 3.64 49 56 7 2.31 incl. 50 51 1 13.10 66 92 26 0.80 incl. 67 74 7 2.06 Notes: All coordinates are GDA94 zone 50, all intercepts use a 0.2 g/t Au lower cut, no upper cut, 2m maximum internal dilution and all intercepts >2.0 GxM are reported. NSI = No Significant Intercept >2.0 GxM This ASX announcement was authorised for release by the Horizon Board. For further information contact: Scott Williamson Managing Director +61 8 6331 6092 info@horizongold.com.au 15 Competent Persons Statement: The information in this announcement that relates to exploration activities and exploration results is based on information compiled by Mr Leigh Ryan, who is a member of The Australasian Institute of Geoscientists. Mr Ryan is the General Manager - Exploration at Horizon Gold Limited and holds shares and options in the Company, Mr Ryan 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 Ryan consents to the inclusion in the report of the matters based on information provided in the form and context in which it appears. No New Information or Data: The information in this announcement that relates to Horizon's production targets and financial forecasts for the Gum Creek Gold Project is extracted from Horizon’s ASX announcement titled “Gum Creek Open Pit DFS Confirms Pathway for WA’s Next Major Gold Mine Development” dated 22 July 2026 and which is available at www.asx.com.au. Horizon believes it has a reasonable basis for making the forward-looking statements in this presentation, including with respect to all production targets and financial forecasts, based on the information contained in that announcement. Horizon confirms that it is not aware of any new information or data that materially affects the production targets, or the financial forecast information, contained in that announcement of the Company’s Definitive Feasibility Study for the Gum Creek Gold Project ("DFS”) and confirms that all material assumptions underpinning the production targets and the financial forecast information in that announcement continue to apply and have not materially changed. Horizon confirms that it is not aware of any new information or data that materially affects the information included in Horizon announcement on 22 July 2026 and, in the case of estimates of Ore Reserves and Mineral Resources, that all material assumptions and technical parameters underpinning the estimates in the relevant ASX announcements continue to apply and have not materially changed. This announcement contains references to Ore Reserves and Mineral Resource estimates, all of which have been cross referenced to previous market announcements. The Company confirms that it is not aware of any additional information or data that materially affects the information included in the relevant market announcements and, in the case of estimates of Ore Reserves and Mineral Resources, that all material assumptions and technical parameters underpinning the estimates in the relevant market announcement continue to apply and have not materially changed. Production Target The Production Target (and forecast financial information derived from the Production Target) referred to in this announcement is underpinned by 76% Probable Ore Reserves, 18% Indicated Resource ounces outside of the Ore Reserves and 6% Inferred Resources ounces. The first 5 years of the Production Target is underpinned by approximately 97% Probable Ore Reserve ounces, and approximately 3% Inferred Mineral Resource ounces. There is a low level of geological confidence associated with Inferred Mineral Resources and there is no certainty that further exploration work will result in the determination of Indicated Mineral Resources or that the Production Target itself (or the forecast financial information) will be realised. The Company believes it has a reasonable basis to disclose a production target that includes some Inferred Mineral Resources, for example as the Inferred Resources are not a determining factor in the viability of the Gum Creek Gold Project. Importantly, the feasibility of the development scenario outlined in the DFS does not hinge on the current Inferred Mineral Resources. Also, the Inferred Mineral Resources do not feature as a significant proportion early in the mine plan. To achieve the range of outcomes anticipated in the DFS, an estimated A$350m of initial capital will be required. The Company believes the assumptions made are reasonable to enable it to obtain the requisite funding required to develop the Project, as detailed in the ASX announcement titled “Gum Creek Open Pit DFS Confirms Pathway for WA’s Next Major Gold Mine Development” dated 22 July 2026. Reference should also be made to other disclaimers included in that announcement. Investors should note that there is no certainty that Horizon will be able to raise the amount of funding when needed (nor any certainty as to the form such capital raising may take, such as equity, debt, hybrid and/or other capital raising, nor whether the Production Target, financial forecasts or other forward- looking information in this announcement may be achieved). It is also possible that such funding may only be available on terms that may be dilutive to or otherwise affect the value of Horizon’s existing shares. 16 Forward Looking Statements: This ASX announcement may contain certain “forward-looking statements” which may not have been based solely on historical facts but rather may be based on the Company’s current expectations about future events and results. Where the Company expresses or implies an expectation or belief as to future events or results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, forward looking statements are subject to risks, uncertainties, assumptions and other factors, which could cause actual results to differ materially from future results expressed, projected or implied by such forward- looking statements. Such risks include, but are not limited to metals price volatility, currency fluctuations, as well as political and operational risks and governmental regulation and judicial outcomes. 17 APPENDIX 2: JORC TABLE 1 (SECTIONS 1 AND 2) Section 1 - Sampling Techniques and Data (Criteria in this section apply to all succeeding sections.) Criteria JORC Code explanation Commentary Sampling techniques • Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling. • Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used. • Aspects of the determination of mineralisation that are Material to the Public Report. • In cases where „industry standard‟ work has been done this would be relatively simple (eg „reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay‟). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may warrant disclosure of detailed information. • Reverse Circulation (RC) drill holes were routinely sampled at 1m intervals down the hole. The upper sections of some holes were sampled at 2m intervals. • Samples were collected at the drill rig using an industry standard rig- mounted cone splitter to collect a nominal 2 - 3 kg sub sample in a numbered calico sample bag, with the remaining sample retained at the drill site for future resampling and/or metallurgical sampling if required. • Routine standard reference material, sample blanks, and sample duplicates were inserted/collected at every 25th sample in the sample sequence. • All RC samples were submitted to Australian Laboratory Services (ALS) in Perth for preparation (including pulverising) to produce a 50g sub-sample for analysis for gold by 50g Fire Assay. Pre-2014 Drillholes • All RC samples were collected at 1m intervals through the drill rig cyclone and then split via riffle and cone splitters. RC samples were typically dry. Composite samples were collected by tube sampling the bulk RC sample bags. • Initially assaying utilised the aqua regia process but most assays used in this report have been by fire assay with an AAS finish using the site laboratory or off-site laboratories. A 50g charge was generally used. • After the year 2000, samples (mainly grade control) were assayed at the accredited on-site laboratory at Gidgee using the Leachwell method. Leachwell cyanide (bottle-roll) assays are apparently more predictive of expected recoveries from Carbon-in-Pulp gold recovery plants, so provide a more realistic grade estimate. Drilling techniques • Drill type (eg core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard tube, depth of diamond tails, face- sampling bit or other type, whether core is oriented and if so, by what method, etc). • All RC holes were completed by reverse circulation (RC) drilling techniques using a DR05 SREPS SR650 drill rig and auxiliary compressor. • Drill rod diameter was 4.5” (114mm) and drill bit diameter was nominally 143mm to 146mm. • A face sampling down hole hammer (5' type 760 SREPS) was used at all times. • All RC drill holes were surveyed for down hole deviation using an Axis Champ Navigator north seeking downhole gyro with downhole readings collected every 5m. Pre-2014 Drillholes • RC drilling was completed with industry standard RC drill rigs using a 4.5” to 5.5” drill bit with either a cross-over sub or a face sampling hammer. 18 Criteria JORC Code explanation Commentary Drill sample recovery • Method of recording and assessing core and chip sample recoveries and results assessed. • Measures taken to maximise sample recovery and ensure representative nature of the samples. • Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material. • A qualitative estimate of sample recovery was done for each RC sample metre collected from the drill rig. • A qualitative estimate of RC sample weight was completed to ensure consistency of sample size and to monitor sample recoveries. • Most RC material was dry when sampled, with damp and wet samples noted in sample sheets and referred to when assays were received. • RC sample recovery and quality is considered to be adequate for the drilling technique