Announcement PDF Dart Mining NL ABN: 84 119 904 880 Level 6, 412 Collins Street Melbourne VIC 3000 Contact: James Chirnside Email: jchirnside@dartmining.com.au Mobile: +61 447 447 613 Webpage: www.dartmining.com.au LinkedIn: Dart Mining NL Twitter: @DartMining 1 | P a g e ASX Release 10th June 2026 DART COMPLETES 4,000m OF DRILLING AT COONAMBULA TO QUALIFY FOR 45% PROJECT INTEREST Dart Mining NL (ASX:DTM) (Dart Mining or the Company) is pleased to announce the completion of the 4,000m drilling under the Joint-Venture (JV) agreement at the Coonambula antimony (Sb) - gold (Au) project near Eidsvold in Central Queensland. The project is a Farm-In Joint Venture with Great Divide Mining (ASX:GDM) (ASX: DTM Mar 2025). HIGHLIGHTS • Dart Mining has completed 4,100m of diamond core drilling at the Banshee Prospect, on EPM 16216; • Drilling was completed over 41 drill holes for an average depth of 100m. The drilling covers a strike extent of 730m and a vertical depth of 185m; and • Geological logging and sampling are now complete and all samples have been sent to the laboratory for assaying. Assay results have been received and announced for holes up to CBADD022. The geological logging and sampling of the outstanding core has been completed with all samples now at the laboratory. Another batch of assay results is expected to be released soon. Figure 1 shows the collar locations of the Dart Mining Coonambula drilling with respect to the Banshee interpreted mineralisation zone. Table 1 outlines the collar location details for the 41 drill holes. With the completion of the 4,000m of drilling, Dart Mining will be increasing its claim to 45% of the Coonambula Project. A further 6%, taking Dart Mining to a majority 51%, will be achieved at the completion of the Mineral Resource Estimate planned at the completion of the assaying programme and metallurgical sighter studies. Dart Mining’s Chairman, James Chirnside, commented: “Dart Mining is very pleased with the completion of the 4,000m planned drilling program at Coonambula. The programme has seen the delivery of some exceptional assays to date, including 9.0m @ 2.67g/t Au + 16.8 g/t Ag + 5.8% Sb from 32.5m (CBADD010) and several intervals with gold greater than 10 g/t and a peak antimony interval of 0.6m @ 44.6% Sb. Dart is expected to convert the equity ownership over the project to 45% in line with the Joint Venture agreement, and we will continue to complete the assays, undertake metallurgical test work, and develop a Mineral Resource Estimate in the near future. 2 | P a g e I would like to acknowledge our partners at Great Divide Mining with whom we have developed a sound and productive working relationship and who continue to be strong supporters of the Coonambula Project.” Figure 1: Location plan showing drill hole locations and preliminary mineralisation interpretation. Table 1: Drill Hole Collar Locations Completed by Dart Mining. Drill Hole Easting (m) Northing (m) RL (m) Azimuth (Deg) Dip (Deg) Total Depth (m) CBADD001 291,938.70 7,173,899.76 237.19 170 -55 75.70 CBADD002 291,874.41 7,173,933.00 236.31 170 -65 212.20 CBADD003 291,853.38 7,173,930.25 232.14 160 -55 170.40 CBADD004 291,920.81 7,173,906.94 240.72 165 -50 140.10 CBADD005 292,054.78 7,173,958.33 239.98 165 -50 176.00 CBADD005a 292,058.50 7,173,948.38 240.34 165 -50 86.00 CBADD006 291,848.34 7,173,862.81 234.60 170 -65 68.10 CBADD007 292,127.02 7,173,969.36 237.51 165 -50 164.00 CBADD008 292,133.95 7,173,919.09 239.98 165 -50 90.00 CBADD009 291,872.82 7,173,884.22 233.52 170 -60 89.20 CBADD010 291,999.92 7,173,862.15 237.96 350 -50 82.70 CBADD011 292,006.64 7,173,927.90 237.71 170 -50 154.40 CBADD012 291,897.46 7,173,899.05 233.75 170 -50 113.00 CBADD013 292,066.14 7,173,911.47 241.27 165 -50 101.00 CBADD014 291,979.03 7,173,904.96 239.01 165 -50 122.00 CBADD015 292,086.35 7,173,965.68 238.55 165 -50 158.20 CBADD016 291,823.25 7,173,830.14 232.29 345 -65 152.40 CBADD017 291,758.12 7,173,882.97 229.75 165 -50 110.00 CBADD018 292,048.62 7,173,873.73 241.06 345 -50 47.50 CBADD019 292,050.69 7,173,868.65 239.64 345 -60 73.90 CBADD020 291,761.06 7,173,790.22 228.46 345 -50 133.10 CBADD021 292,252.37 7,173,887.41 230.80 345 -60 74.30 3 | P a g e CBADD022 292,152.31 7,173,870.77 237.28 345 -60 98.20 CBADD023 292,200.44 7,173,862.28 234.67 345 -50 128.00 CBADD024 291,680.05 7,173,774.73 223.91 345 -50 128.00 CBADD025 291,565.09 7,173,754.57 218.02 345 -50 124.50 CBADD026 291,747.80 7,173,835.27 229.27 350 -65 47.10 CBADD027 291,796.70 7,173,847.00 231.78 350 -65 32.20 CBADD028 291,901.54 7,173,861.00 232.56 350 -65 50.30 CBADD029 292,115.08 7,173,891.02 240.11 350 -65 61.90 CBADD030 292,162.74 7,173,886.96 236.77 350 -65 41.50 CBADD031 292,199.48 7,173,893.79 234.94 350 -65 58.90 CBADD031a 292,199.50 7,173,893.29 234.91 350 -65 32.30 CBADD032 291,682.65 7,173,824.35 224.60 350 -65 49.90 CBADD033 291,653.27 7,173,817.62 222.62 350 -65 56.30 CBADD034 291,573.87 7,173,800.39 221.27 350 -65 62.20 CBADD035 291,525.77 7,173,794.32 219.12 350 -65 56.40 CBADD036 291,529.26 7,173,782.99 220.11 350 -65 18.70 CBADD037 291,532.89 7,173,880.11 224.21 165 -60 188.30 CBADD038 291,623.86 7,173,881.73 224.51 165 -60 127.80 CBADD039 291,668.16 7,173,894.13 226.18 165 -60 143.40 Previous Dart Results Highlight assays from Dart’s first hole, CBADD001, (ASX: DTM 10 November 2025) include: • 5.0m @ 4.33% Sb + 1.69 g/t Au + 23.65 g/t Ag from 41.5m; ▪ including 0.65m @ 32.20% Sb + 2.91 g/t Au + 10.50 g/t Ag from 42.0; ▪ 0.5m @ 2.53 g/t Au from 42.65m and ▪ 0.7m @ 5.61 g/t Au + 154 g/t Ag from 45.4m. • 1.6m @ 9.47% Sb + 0.35 g/t Au + 4.09 g/t Ag from 68.2m; ▪ including 0.5m @ 29.60% Sb + 0.65 g/t Au + 12.60 g/t Ag from 68.7. Highlight assays from CBADD002 (ASX: DTM 15 December 2025) include: • Broader gold zones containing antimony mineralised zones • 1.4m @ 2.00 g/t Au + 0.97% Sb from 134.0m including: ▪ 0.3m @ 7.33 g/t Au + 4.40% Sb from 134.5m. • 6.5m @ 5.1 g/t Au + 0.15% Sb from 180.0m including: ▪ 1.5m @ 7.32 g/t Au from 182.5m; ▪ 0.5m @ 18.30 g/t Au from 184.5m; and ▪ 1.0m @ 6.38 g/t Au + 0.92% Sb from 185.5m. ▪ Highlight assays from CBADD003 through CBADD010 (ASX: DTM 19 February 2026) include: • 9.0m @ 2.67g/t Au + 16.8 g/t Ag + 5.8% Sb from 32.5m (CBADD010) including; ▪ 1.2m @ 5.5 g/t Au + 85.1 g/t Ag + 18.8% Sb from 37.7m; and ▪ 0.6m @ 1.62 g/t Au + 17.2 g/t Ag + 44.6% Sb from 37.9m; and ▪ 0.5m @ 10.75 g/t Au + 3.5 g/t Ag + 4.7% Sb from 39.0m. • 4.3m @ 3.61 g/t Au + 3.3 g/t Ag + 0.2% Sb from 43.2m (CBADD009) including; ▪ 0.9m @ 9.44 g/t Au + 2.3 g/t Ag + 0.5% Sb from 43.2m; and ▪ 0.3m @ 4.02 g/t Au + 27.6 g/t Ag + 1.3% Sb from 46.1m. • 2.2m @ 4.29 g/t Au + 4.0 g/t Ag + 0.2% Sb from 82.9m (CBADD005) including; ▪ 0.5m @ 10.05 g/t Au + 1.3 g/t Ag from 84.6m; and ▪ 0.4 @ 6.18 g/t Au + 4.3 g/t Ag + 1.0% Sb from 85.1m. • 1.3m @ 3.80 g/t Au + 131.9 g/t Ag + 10.5% Sb from 8.7m (CBADD006); • 1.3m @ 2.12 g/t Au + 68.5 g/t Ag + 10.2% Sb from 131.4m (CBADD003) including; 4 | P a g e ▪ 0.5m @ 2.74 g/t Au + 145.0 g/t Ag + 24.9% Sb from 131.4m. • 2.1m @ 1.61 g/t Au + 71.5 g/t Ag + 0.5% Sb from 57.5m (CBADD004) including; ▪ 0.6m @ 2.45 g/t Au + 234.0 g/t Ag + 1.8% Sb from 58.0m. Dart Mining rock chip sampling revealed high grade antimony, gold and silver (ASX: DTM 10 October 2025). Assays received across 9 samples of float and in situ veins across the historic Banshee antimony mine area include: • Antimony results up to 65.3% Sb and 55.5% Sb • Gold grades up to 17.0g/t Au and 15.05g/t Au • Silver assays up to 97.9g/t Ag and 66.7g/t Ag Trench sampling conducted immediately south of the Banshee mine confirmed high grade gold, silver and antimony (ASX: DTM 15 January 2026). Samples from regular 1m intervals returned: • Gold grades up to 10.45g/t Au and 8.92g/t Au • Silver assays up to 125g/t Ag and 121g/t Ag • Antimony results up to 5.14% Sb Prior to Dart Mining, previous highlights across the project include: • Highlights from 2014 drilling as per the GDM Prospectus (ASX: GDM Prospectus 2023): o 3m @ 9.18% Sb in hole CNRC03 from 158m including 1m @ 25% Sb from 158m; o 6m @ 5.12% Sb & 1.55 g/t Au in hole CNRC04 from 77m; o 3m @ 1.50% Sb & 8.53 g/t Au in hole CNRC05 from 18m; • Rock chips of 44.9% Sb, 24.1% Sb, 39.9% Sb, and 39.4% Sb (ASX: GDM Prospectus 2023): • Surface trenching includes 4m@ 3.09 g/t Au and 1.14% Sb and 1m @ 6.15 g/t Au and 3.1% Sb. While trenching, selective rock chips returned 3.65 g/t Au with 23.9% Sb, and 9.93 g/t Au with 7.56% Sb (ASX: GDM Nov 2024). NEXT STEPS Dart Mining and its Joint Venture partner, Great Divide Mining, will progress farm-in exploration at the Coonambula project including: • Report diamond drilling assay results as they are received and approved; • Select and submit composite drill cores for metallurgical test-work to support concepts on ore types and recoveries; and • Develop a 3D model and declare a JORC resource at the earliest possible opportunity subject to drill results. • Develop the next phase of exploration based upon drill results and the IP survey. Additional targets will also be considered for drilling. Approved for release by the Board of Directors. For more information contact: James Chirnside Managing Director Dart Mining NL jchirnside@dartmining.com.au +61 419 605 842 InvestorHub Link Terry Bates Director Dart Mining NL tbates@dartmining.com.au 5 | P a g e COONAMBULA ANTIMONY-GOLD PROJECT The Coonambula Antimony-Gold Project (Coonambula or Project) is located approximately 390km by road north-northwest of Brisbane, Queensland. Coonambula is 70km southeast of the multi- million-ounce Cracow gold mine and 25km southwest of the Eidsvold goldfield (Figure 2). The Project is comprised of five granted Exploration Permits: EPM 15203, EPM 16216, EPM 25260, EPM 26743 and EPM 28433 covering 282 sq.km., and application EPM 29186 covering an area of 227sq.km. Figure 2: Project Location Plan. Geology – New England Fold Belt geology hosts high grade quartz veins containing Sb-Au at Hillgrove and Wild Cattle Creek in NSW, and Antimony at Neardie near Gympie QLD. Mineralisation at Coonambula is hosted within intrusive granodiorites and holds the potential to host a large intrusion related gold system, with attractive magnetic signature and structural geology. Two distinct types of reef mineralisation occur: Gold associated with arsenopyrite in quartz and high-grade antimony with calcite in quartz. Disseminated stibnite is recorded in the gold lodes (Malnic, 1985). Banshee is one of the largest historical antimony mining complexes in Central Queensland, located 70km Southeast of the Cracow gold mine and 25km SW of Eidsvold. Banshee is a historic high- grade direct shipping ore antimony mine (worked variously between 1876 and 1983, The Banshee Mine when reopened in 1983 produced 20t of ore containing 4t of Antimony (GDM Prospectus 2023). 12 RC and 1 diamond drill hole were drilled in 2014 over 650m of strike length at Banshee. 6 | P a g e Directly east of Banshee lies another Antimony-Gold prospect called Lady Mary (previously called Lady May). This prospect lies 1km along strike from Banshee, potentially along the same E-W Banshee structure. Surface rock chip samples from old mine dumps at Lady Mary have returned up to 49.6% Sb and 1.3 g/t Au (GDM Sep 2024). The area between Banshee and Lady Mary has not yet been explored and is a high priority target after the current IP survey indicates a continuous zone between the two historic mines. The Perseverance mine was mined to 132m depth with mining widths up to 10m wide (GDM Prospectus 2023). Past production of gold from the mine was reported as 20kt @ 20g/t Au (Malnic, 1985) however only 3 drill holes have been completed to date. Total strike of the prospective antimony zone is approximately 5km with historic mines either side of Banshee. Lady Mary located 900m east of Banshee with additional historic mines occurring some 3km west of Banshee giving a potential E-W strike of 5km. Individual high grade antimony shoots are interpreted as having a strike length of 30-100m each based upon Banshee drilling where 3 shoots of this length exist in the central core zone. In GDM’s 2023 prospectus (GDM Prospectus 2023) consulting company Derisk stated that it: “Considers that the Coonambula project tenements are prospective for mesothermal vein and stockwork gold and gold-antimony deposits, as well as intrusion-related and epithermal gold deposits. Most work at this project has focused on areas in and around historical mine workings. Derisk considers there is potential to define extensions or repetitions of known mineralisation at some of the historical workings. There is also potential to discover new mineralisation but exploration for these targets is at a very early stage.” Figure 3: Banshee mine waste dump material observed (unsampled) by Dart Mining in January 2025 showing antimony mineral (70% stibnite*) with encasing vein quartz.* *Visual estimates of mineral abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical properties relevant to valuations 7 | P a g e Figure 4: Coonambula geology and key prospects. 8 | P a g e About Dart Mining The Triumph Gold Project is Dart’s first step into an advanced intrusion related gold system project in Queensland. Dart will look to develop a regional presence in Queensland through advanced stage intrusion related and epithermal gold projects. Dart is farming into the Coonambula Antimony-Gold Project in Central Queensland. Dart Mining will continue to evaluate several historic goldfields in Central and Northeast Victoria including the Rushworth Goldfield and the new porphyry and lithium province in Northeast Victoria identified by Dart. The area is prospective for precious, base, and strategic metals. Dart Mining has built a strategic and highly prospective gold exploration portfolio in Central and Northeast regions of Victoria, where historic surface and alluvial gold mining indicates the existence of potentially large gold endowment. Forward-Looking Statement Certain statements contained in this document constitute forward-looking statements. Forward-looking statements include, but are not limited to, Dart Mining’s current expectations, estimates and projections about the industry in which Dart Mining operates, and beliefs and assumptions regarding Dart Mining’s future performance. Such forward-looking statements are based on a number of estimates and assumptions made by the Company and its consultants in light of experience, current conditions and expectations of future developments which the Company believes are appropriate in the current circumstances. When used in this document, words such as; “anticipate”, “could”, “intends”, “estimate”, “potential”, “plan”, “seeks”, “may”, “should”, and similar expressions are forward-looking statements. Although Dart Mining believes that its expectations presented in these forward-looking statements are reasonable, such statements are subject to known and unknown risks, uncertainties and other factors, which may cause the actual results, achievements and performance of the Company to be materially different from the future results and achievements expressed or implied by such forward-looking statements. Investors are cautioned that forward-looking information is no guarantee of future performance and accordingly, investors are cautioned not to place undue reliance on these forward-looking statements. No new information has been included in this release, all exploration results have been previously reported by Great Divide Mining (ASX: GDM) and are available on their website. Dart Mining is not aware of any new information or data that materially affects the information included in the original announcements.