Announcement PDF Castle Minerals Limited ASX Announcement 16 June 2025 High Grade Gold Hits, Kpali Prospect, Ghana • Latest drilling at Kpali prospect successfully extends major lodes along strike and to depth confirming continuity and robust nature of mineralisation. • Notable intercepts from the 23 RC hole, 2,793m programme include: • 1m at 20.66g/t Au from 41m (25KPRC018). • 19m at 2.93g/t Au from 77m (25KPRC024) incl. • 4m at 5.43g/t Au from 84m and • 6m at 4.19g/t Au from 115m. • 7m at 2.22g/t Au from 178m (25KPRC025). • 12m at 3.52g/t Au from 138m (25KPRC026) incl. • 4m at 7.17g/t Au from 140m. • 6m at 2.8g/t Au from 19m (25KPRC029) incl • 3m at 4.24g/t Au from 19m. • 9m at 3.47g/t Au from 5m (25KPRC035) incl. • 3m at 8.21g/t Au from 9m and • 6m at 2.67g/t Au from 18m and • 6m at 2.03g/t Au from 29m. • Results from five holes drilled at the Bundi prospect, 4km north of the Kpali prospect, expected to be reported in early-July 2025. • Drilling completed of ten holes at the Kandia Project with results expected to be reported mid-July 2025. • Follow-up RC drilling at Kpali and Kandia Gold Projects scheduled for September 2025, subject to rig availability and seasonal rains abating. • Newly acquired high-resolution aeromagnetic data coverage at the Kpali Gold Project and detailed structural interpretations and targeting commissioned from a specialist in West African gold discovery to drive step-out exploration across Castle’s entire tenure. • Auger drilling to commence in July 2025 to firm-up several existing targets and to investigate newly generated targets. Principal and Registered Office Suite 9 / 11 Ventnor Ave, West Perth, WA 6005 | Postal PO Box 437 West Perth, WA 6872 Contact admin@castleminerals.com | www.castleminerals.com | Telephone +61 8 93227018 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Fig 1: Kpali Prospect: Notable intercepts from June 2025 RC drilling programme (in red) with selected historical drilling results. Fig 2: Kpali Prospect: Cross-section (1029330mN) showing latest drill holes and multi-lode distribution of high-grade mineralisation. Page 2 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Castle Executive Chairman, Stephen Stone, commented: “The Kpali Gold Project continues to grow in stature with the latest RC drilling campaign at the namesake Kpali prospect delivering a raft of high-grade intercepts that confirm the presence of two very robust and consistently mineralised lodes over a 650m north-south strike. A 1m intercept of 20.66g/t Au obtained at a shallow depth of 41m has extended the high grade hanging wall lode 80m further north, whilst on section 1,029,330N new intercepts of 9m at 3.47g/t Au from 5m including 3m at 8.21g/t Au from 9m and below that 19m at 2.93g/t Au from 77m, including 4m at 5.43g/t Au from 84m and 6m at 4.19g/t Au from 115m, confirm the Hanging Wall lode on this section be extremely well mineralised. This observation also applies to the footwall lode on the same section where mineralisation has now been confirmed to extend to at least 120m depth. Other intercepts such as 12m at 3.52g/t Au from 138m including 4m at 7.17g/t Au from 140m and 6m at 2.80g/t Au from 19m demonstrate the footwall and other nearby lodes to be just as strongly mineralised in the southern portion of the deposit with mineralisation yet to be closed off. Results from five RC holes drilled at the nearby Bundi prospect will be released in the coming weeks to be followed by assays from a just completed ten-hole RC programme at the Kandia Gold Project, 110km to the north east. The Kpali prospect is one of several prospects comprising the broader Kpali Gold Project, a new gold district discovered by Castle in Ghana’s emerging north where the 5.1Moz Namdini and 2.8Moz Black Volta Gold Projects demonstrate this emerging region’s considerable prospectivity. Having undertaken three successful drilling campaigns in the past nine months, Castle will continue this momentum with more rounds of RC drilling planned at the Kpali and Kandia Gold Projects which could commence as early as September 2025. In the short term we will commission a series of auger drilling campaigns at both projects and on Castle’s broader tenure to firm up several historical targets and to generate new ones to also be drill tested later this year.” Fig 31: Kpali Prospect: North-south long-section through mineralised hangingwall and footwall lodes. Page 3 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Castle Minerals Limited (“Castle”, “the Company”)(ASX:CDT) is pleased to report that a 23-hole, 2,793m drilling programme at its Kpali prospect has returned several high-grade intercepts that have successfully extended mineralisation along strike and to greater depth. A raft of robust shallow to deeper intercepts confirm the presence of two dominant, closely aligned, northsouth striking, sub-parallel mineralised lodes and several other narrower lodes. Notable intercepts include: • 1m at 20.66g/t Au from 71m (25KPRC018) • 19m at 2.93g/t Au from 77m (25KPRC024) incl. • 4m at 5.43g/t Au from 84m and • 6m at 4.19g/t Au from 115m. • 7m at 2.22g/t Au from 178m (25KPRC025). • 12m at 3.52g/t Au from 138m (25KPRC026) incl. • 4m at 7.17g/t Au from 140m. • 6m at 2.8g/t Au from 19m (25KPRC029) incl • 3m at 4.24g/t Au from 19m. • 9m at 3.47g/t Au from 5m (25KPRC035) incl. • 3m at 8.21g/t Au from 9m and • 6m at 2.67g/t Au from 18m and • 6m at 2.03g/t Au from 29m. There were numerous other intercepts of above ‘economic’ grade mineralisation including: • 6m at 2.42g/t Au from 56m (25KPRC028). • 7m at 1.54g/t Au from 33m (25KPRC033). • 121m at 0.78g/t Au from 46m (25KPRC033). • 117m at 1.79g/t Au from 18m (25KPRC035). Fig 4: Kpali Gold Project: Key prospects on VTEM (electromagnetics) with Castle’s recent structural interpretation 1 Using a 0.5g/t Au cut off (max 2m internal dilution). Refer Table B for all intercepts above a 1g/t Au cut-off (max 2m internal dilution). The gold at the Kpali prospect is hosted in a series of steeply dipping, s lodes in metamorphosed sandstones within an interpreted north-south trending structural corridor that includes the Bundi prospect to the north and minor artisanal workings to the south. Mineralisation has been delineated over 650m and to a depth of at least 120m. Of the two main mineralised lodes at the Kpali prospect, the “footwall lode” is best represented in the central and southern portions of the structural zone and extends for some 490m. Latest intercepts from this lode include 12m at 3.52g/t Au from 138m including 4m at 7.17g/t Au from 140m and 6m at 2.80g/t Au from 19m. These confirm the footwall lode to be strongly and consistently mineralised right to its southern extent where it has yet to be closed off. The separate and generally higher grade “hangingwall lode” occurs immediately to the west of the footwall lode and is traceable for 300m and is still open to the north. An intercept of 1m at 20.66g/t Au (25KPRC018) has extended this lode another 40m north. Hangingwall lode intercepts (not true thickness but close to) vary from 1m to 19m with intercepts of up to 19m at 2.93g/t Au (25KPRC024) in the latest round of drilling. Cross-section 1,029,330N shows how the impressive intercepts in 24KPRC010 obtained in the previous campaign (refer ASX 13 February 2025) has been successfully followed up with one hole above and two holes below to reveal a considerable shallow-depth endowment of mineralisation on this particular section. This mineralisation is most likely plunging to the north and off-section as depicted in Fig. 3 (Long Section). Three holes designed to test both the hangingwall and main footwall lodes of the Kpali prospect required redrilling due to technical problems encountered as they passed through a distinct structural zone. Assays from non-compromised intervals in the upper part of these three holes have been included in the reporting as they have still met all stringent QA/QC criteria. Page 4 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 In February 2025 Castle reported assay results from its previous RC drilling programme at the Kpali prospect. This comprised an eight-hole, 1,106m RC campaign. Intercepts included 12m at 8.29g/t Au from 25m including 6m at 11.60g/t Au from 31m and a peak 1m intercept of 20.43g/t Au at 36m in the interpreted ‘hangingwall’ lode and then 4m at 4.16g/t Au from 95m in the lower “footwall” or “main lode” (24KPRC010) Additional intercepts included 7m at 2.23g/t Au from 35m (24KPRC011) including 11m at 2.24g/t Au from 50m, 5m at 3.66g/t Au from 78m (24KPRC012), 9m at 4.81g/t Au from 107m (24KPRC015) and 3m at 3.08g/t Au from 78m (KPRC017). The structurally-controlled, orogenic lode style mineralisation at the Kpali prospect is very typical of many of the major gold deposits located in West Africa’s Birimian geological terrane a majority of which extend to considerable depth. Artisanal workings Whilst artisanal miners appear to be extracting some gold from artisanal workings to the south of the Kpali prospect, a line of three RC holes along a north-south traverse did not encounter any mineralisation of note below these workings. The mineralisation is either very nuggety, depleted close to surface or not there. Bundi prospect results pending Drilling results from five holes completed (a sixth was unable to be collared due to poor ground conditions) at the Bundi prospect, 4km north of the Kpali prospect, will be reported in coming weeks. This is the first drilling undertaken at this prospect in more than 10 years. The programme has been designed to infill and extend mineralisation confirmed in two prior RC programmes where better intercepts included 1m at 51.03g/t Au from 168m and 6m at 3.32g/t Au from 37m (refer ASX release 17 June 2013, 31 January 2014 and 29 April 2014): • • • • • • • • 3m at 3.19 g/t Au from 25m (13SWRC026). 6m at 3.32g/t Au from 37m (13SWRC027). 2m at 7.89g/t Au from 40m (13SWRC028). 2m at 9.10g/t Au from 68m (13SWRC032). 1m at 51.03g/t Au from 168m (13SWRC040). 2m at 3.02g/t Au from 144m (13SWRC044). 4m at 2.38g/t Au from 30m (13SWRC045). 5m at 1.40g/t Au from 209m (14SWRC066). Kpali Gold Project strategy A compelling driver for exploring the Kpali Gold Project is its advantageous location at the convergence of two major greenstone belts (Bole-Bolgatanga and WaLawra/Boromo) and three regional-scale structures. Fig 5: Bundi historical drilling results. These are all associated with gold mineralisation and support the thesis that Kpali provides a large and prospective “search base” for the discovery of a major new West African mining camp. Given the work completed to date, all prospects comprising the Kpali Gold Project, including additionally the Kpali East, Wa South East and Wa South West prospects, collectively present all the hallmarks of a new West African mining camp and the possibility of a considerable gold endowment in an area with no prior gold indications. Exploration at the Kpali Gold Project has only to look to the 5.1Moz Namdini and the 2.8Moz Black Volta Gold Projects in the same region for encouragement. These discoveries also had similar modest beginnings. Page 5 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Follow-up RC drilling The successful RC drilling campaigns at the Kpali Gold Project means that a more comprehensive followup campaign is warranted to infill and extend presently defined mineralisation. This work is earmarked to commence as soon as possible after seasonal rains have abated and subject to rig availability with planning being made around a possible end-September 2025 start. The next rounds of drilling will be designed over coming weeks with the benefit of a detailed review of the latest and historical drilling results. Fig 6: Castle’s “Wa East” licence interests showing location of Kandia Gold Project and numerous workings and prospects requiring investigation. Proposed auger drilling campaign On the basis that the more prosects there are to test the better the chances are of making material discoveries, auger drilling campaigns are planned to firm up several historical targets and define new targets across the broader Kpali and Kandia Gold Projects as well as Castle’s several other “Wa East” tenure. Castle’s VTEM and ground magnetic data at the Kpali Gold Project, backed up by historical high-resolution aeromagnetic imagery, was used to inform a recently completed structural and geological interpretation in that region commissioned from a specialist in West African gold exploration. This interpretation will be enhanced by the reprocessing of the raw data that generated that aeromagnetic imagery and which has only just been acquired from the original owner. Data from a separate high resolution aeromagnetic survey commissioned by Castle is being used to drive broader exploration at Kandia and the Wa East region. Page 6 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 The auger drilling work will commence as soon as a suitable drill rig can be contracted and when impending seasonal rains and ground conditions allow. This is most likely to occur in late-July as these rigs are a lot lighter and more mobile than RC rigs. Fig 7: Ghana’s Upper West Region. Note convergence of fertile Wa-Lawra and Bole-Bolgatanga Birimian greenstone belts and three major structures at the Kpali Gold Project plus the close proximity of the Kandia Gold Project to the Azumah Resources’ Julie and Julie West deposits. Page 7 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 About gold in Northern Ghana West Africa is regarded as one of the world’s premier regions to be exploring for gold, delivering an enviable fifteen discoveries of over two million ounces each since 2012. Much of this new gold is found in Birimian age ‘greenstone’ rocks, the host to many of West Africa’s and Ghana’s existing multi-million-ounce gold mines. Birimian rocks are also the host to mineralisation at Kpali and Kandia. Ghana’s “new frontier” northern region is now considered one of the most prospective areas to make such discoveries in West Africa. Exploration in the region is relatively immature compared to Ghana’s south where several world-class mines have been operating for many decades. This immaturity in the northern region along with its Birimian geology and structural setting, bodes well for more discoveries to be made and is directly analogous to the similarly prospective geology of Cote d’Ivoire which is receiving considerable interest from a raft of junior to major explorers. Perceptions of Northern Ghana’s prospectivity are rapidly changing given the relatively recent development of the 5.1Moz Namdini gold deposit, discovered by Cardinal Resources Limited prior to its takeover by Shandong Gold Limited in 2020. Namdini lies on the same Bole-Bolgatanga Birimian greenstone belt as Castle’s Kandia discovery. The Azumah Resources Limited owned 2.8Moz Black Volta Gold Project (“BVGP”), earmarked for a development start in 2025, is another relatively recent discovery. A majority of this gold was delineated by Castle’s Executive Chairman, Stephen Stone, under his former stewardship of Azumah. Castle’s Kandia mineralised trend is immediately to the south of the BVGP’s high-grade Julie deposit. Authorised for release to ASX by the Board of Castle Minerals Limited: Stephen Stone Executive Chairman stone@castleminerals.com +61 (0)418 804 564 ABOUT CASTLE MINERALS Castle Minerals Limited is an Australian Securities Exchange (ASX: CDT) listed and Perth, Western Australia headquartered company with interests in several projects in Ghana and Western Australia that are prospective for gold, graphite and base metals. In Ghana, West Africa, Castle’s 100% owned Ghanaian subsidiary, Carlie Mining Ltd, owns the Kpali Gold Project in the Upper West Region which comprises the Kpali, Kpali East and Bundi gold prospects. The Kandia Gold Project, is a separately located standalone discovery. All occur in highly prospective Birimian geological terrane, the host to many of West Africa’s and Ghana’s multi-million-ounce gold mines. The 100% owned Kambale Graphite Project is also located in Ghana’s Upper West Region. It is being progressed through technical and commercial evaluation for the production of battery grade material to be used in lithium-ion battery manufacture. Page 8 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Farm-outs or sales have been or are being sought for the Company’s West Australian projects: The Polelle Project, 7km southeast of the operating Bluebird gold mine near Meekatharra, hosts a mainly obscured and minimally explored greenstone belt prospective for gold and possibly base metals. The Wanganui Project is prospective for down-plunge high-grade gold shoots. Both have been optioned for purchase to Great Boulder Resources Limited (ASX: GBR) for possible incorporation into its emerging Side Well project. The Terra Rossa copper-zinc project is located on the western edge of the Earaheedy Basin. It is adjacent to the evolving WorldClass Chinook-Magazine zinc-lead project of Rumble Resources Ltd (ASX: RTR). The Beasley Creek Project is prospective for gold and lithium and lies on the northern flanks of the Rocklea Dome in the southern Pilbara. PREVIOUSLY REPORTED INFORMATION RELATING TO THIS RELEASE Additional details, where applicable, can be found in the releases referenced in this Report and/or in releases lodged by the Company with the ASX, including the following: Headline Date March 2025 Quarterly Report & Appendix 5B 28 April 2025 Next Phase of Drilling to Commence at Kpali Gold Project Castle raises $3 Million to Accelerate Ghana Gold Drilling 24 March 2025 3 March 2025 High Grade Gold intercepts Confirm Kpali Discovery 13 February 2025 Excellent Gold Intercepts From Drilling at Kandia Prospect 28 January 2015 Drilling Completed at Kpali and Kandia Gold Prospects 15 January 2025 Drilling Commences at Kpali and Kandia Gold Prospects 19 December 2024 Kpali Drilling Programme Completed and Drill-for-Equity Agreement 22 August 2024 Castle Commences Drilling at Kpali Gold Project 7 August 2024 Reprocessed Geophysics and Historical Intercepts to Drive Ghana Gold Expansion 11 June 2024 US$11.7 Million Farm-Out Agreement, Degbiwu and Gbiniyiri Licences, Ghana 14 August 2019 New Graphite Discovery in Ghana 30 July 2014 Maiden Resource Estimate for the Kpali Gold Prospect 2 July 2014 New Gold Zone Intersected at Kpali 20 March 2014 High Grade Gold Intersected at Bundi Prospect 31 January 2014 Kpali Gold Discovery 28 January 2014 Kpali Drill Results 18 January 2014 Multiple EM targets identified at Bundi Prospect 28 October 2013 Geophysical Survey Commences at Bundi and Kpali 13 August 2013 Drilling Extends Kpali Gold Discovery 4 July 2013 High Grade Gold Horizon Defined at Bundi Prospect 17 June 2013 New Gold Discovery at Kpali Prospect in Ghana 24 May 2013 RC Drilling Confirms Gold and Zinc Discovery at Bundi Prospect 23 May 2013 New 600m Long Gold Zone Defined – Kpali Prospect 20 May 2013 New Gold Hits South of Bundi Prospect RC drilling Commences 6 May 2013 Page 9 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Bundi Gold Target Increases to 1,400m 22 April 2013 Drilling Confirms Gold Mineralisation at Wa South and New Prospect Identified 26 September 2012 Auger Drilling Defines Large Gold Anomaly at Wa South 19 May 2011 Table A: Drill Hole Collar Information – Kpali Prospect Prospect DH Hole East North RL Total Depth (m) Azimuth Dip Kpali 25KPRC018 535174 1029481 230 120 90 -50 Kpali 25KPRC019 535174 1029436 230 118 90 -50 Kpali 25KPRC020 535181 1029414 230 109 90 -50 Kpali 25KPRC021 535129 1029413 230 163 90 -50 Kpali 25KPRC022 535139 1029387 230 120 90 -50 Kpali 25KPRC023 535147 1029363 230 100 90 -50 Kpali 25KPRC024 535135 1029330 230 151 90 -50 Kpali 25KPRC025 535095 1029329 230 193 90 -50 Kpali 25KPRC020B 535183 1029415 230 138 90 -50 Kpali 25KPRC022B 535140 1029385 230 155 90 -50 Kpali 25KPRC023B 535149 1029360 230 181 90 -50 Kpali 25KPRC026 535088 1029060 230 160 90 -50 Kpali 25KPRC027 535120 1028930 230 120 90 -50 Kpali 25KPRC028 535175 1029081 230 79 90 -50 Kpali 25KPRC029 535199 1029101 230 97 90 -50 Kpali 25KPRC030 535069 1029101 230 180 90 -50 Kpali Artisanal 25KPRC031 534563 1027605 230 86 90 -50 Kpali Artisanal 25KPRC032 534565 1027648 230 73 90 -50 Kpali 25KPRC033 535188 1029152 230 100 90 -50 Kpali 25KPRC034 535264 1029101 230 100 90 -50 Kpali 25KPRC035 535196 1029334 230 90 90 -50 Kpali 25KPRC036 535206 1029392 230 80 90 -50 Kpali Artisanal 25KPRC037 534561 1027586 230 80 90 -50 Table B: Summary of key intercepts from Kpali 23-hole RC Drilling Programme. (>1g/t Au lower cut, max 2m internal dilution) Hole Number 25KPRC018 25KPRC019 *25KPRC020 25KPRC021 *25KPRC022 *25KPRC023 25KPRC024 incl. and and From (m) 41 91 84 69 55 57 72 77 To Width (m) (m) 42 1 92 1 No Significant Results No Significant Results 86 2 70 1 59 4 59 2 73 1 96 19 Page 10 of 17 Au g/t 20.66 1.69 2.8 3.34 2.05 3.09 1.34 2.93 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 To Width (m) (m) incl. 88 4 and 102 1 and 121 6 and 145 6 incl 145 1 25KPRC025 111 2 and 173 4 and 185 7 incl 182 1 25KPRC020B No Significant Results 25KPRC022B 78 79 1 and 152 153 1 25KPRC023B 64 65 1 and 176 177 1 25KPRC026 138 150 12 incl. 140 144 4 25KPRC027 No Significant Results 25KPRC028 45 46 1 and 56 62 6 and 66 67 1 25KPRC029 19 25 6 Incl. 19 22 3 and 31 32 1 25KPRC030 83 84 1 and 160 161 1 **25KPRC031 No Significant Results **25KPRC032 No Significant Results 25KPRC033 26 30 4 and 33 40 7 Incl. 35 37 2 and 46 51 5 and 58 59 1 and 65 66 1 25KPRC034 No Significant Results 25KPRC035 5 14 9 Incl. 9 12 3 and 18 24 6 incl 22 24 2 and 29 35 6 and 47 50 3 and 72 73 1 and 82 84 2 25KPRC036 44 45 1 **25KPRC037 No Significant Results *Holes redrilled due to water contamination in original hole **Artisanal workings /Kpali South Hole Number From (m) 84 101 115 139 144 109 169 178 181 Au g/t 5.43 1.10 4.19 1.48 5.09 3.16 1.65 2.22 6.97 1.16 2.26 6.66 1.29 3.52 7.17 1.01 2.42 1.11 2.80 4.24 2.76 1.70 1.74 1.80 1.54 3.28 1.19 3.43 1.08 3.47 8.21 2.67 5.70 2.03 2.19 1.99 1.27 1.15 Kpali Gold Project: RC Drill Results – June 2025 – Undertaken by Castle Minerals Limited Appendix: JORC Code 2012 Edition – Table 1 Section 1: Sampling Techniques and Data (Criteria in this section apply to all succeeding sections) Page 11 of 17 Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Criteria JORC Code explanation • Nature and quality of sampling (e.g. 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 simple (e.g., ‘reverse circulation drilling was used to obtain 1 m samples from which 3kg was pulverised to produce a 30g 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 (e.g., submarine nodules) may warrant disclosure of detailed information. RC drill cuttings were collected at regular one metre intervals during drilling operations. • Drill type (e.g., core, reverse circulation, openhole 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.). The drilling programme was completed using a reverse circulation drill with a 110mm face sampling hammer. • 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. Sample volume returns were monitored visually during drill operations by the rig geologist. There were no wet samples collected during the drill program. Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies. Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography. The total length and percentage of the relevant intersections logged. Geological logging of the drill chips was completed by a qualified geologist using a company standard logging code. The logging included descriptions for color, lithology, mineralogy, structure, grain size, alteration, alteration intensity, weathering. If core, whether cut or sawn and whether quarter, half or all core taken. If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry. For all sample types, the nature, quality and appropriateness of the sample preparation technique. Quality control procedures adopted for all subsampling stages to maximise representivity of samples. Measures taken to ensure that the sampling is representative of the insitu material collected, Bulk samples were collected at metre intervals via a cyclone. Intervals displaying strong alteration, sulphide mineralisation or quartz veining where selected for immediate individual sampling with the remainder of the hole sampled at the conclusion of drilling. The original one metre bulk sample bags were passed through a 3tier riffle splitter and a 2–3kg subsample was collected in a numbered calico bag. • Sampling techniques • • Drilling techniques • Drill sample recovery • • Logging • • • • Subsampling techniques and sample preparation Certified Person Commentary • • • Page 12 of 17 The sampling methods employed are standard industry practice, and were supervised by qualified and experienced geological personnel employed by Castle. RC samples were processed and using standard industry practices of sorting, drying pulverizing followed by fire assaying by Intertek Laboratories (Ghana) In the RC drilling, the cyclone and sample hose were regularly purged and cleaned during drill operations to minimise contamination. There does not appear to be a relationship between sample recovery and grade. RC logging is semi qualitative, given the nature of the rock chip fragments. Chip trays were collected for each RC hole and photographed. For quality control purposes field duplicates were undertaken at a rate of one per every 20 samples. Castle Minerals Limited (ASX: CDT) Kpali RC Drilling Results – 16 June 2025 Criteria JORC Code explanation • • • Quality of assay data and laboratory tests • • • • Verification of sampling and assaying • Certified Person Commentary including for instance results for field duplicate/second-half sampling. Whether sample sizes are appropriate to the grain size of the material being sampled. The sample size is considered appropriate for the grain size of the material being sampled. The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total. For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc. Nature of quality control procedures adopted (e.g. standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (i.e. lack of bias) and precision have been established. Samples were sent to Intertek Laboratories (Ghana) at Tarkwa Ghana. The entire sample was dried and pulverised to a nominal 85% passing 75 micron. A 50g subsample was collected and analysed for gold by fire assay with a AAS finish (FA50L/AA). The verification of significant intersections by either independent or alternative company personnel. The use of twinned holes. Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. Discuss any adjustment to assay data. No independent or alternative company has been engaged to verify the results. The Company inserted certified reference standards at a rate of 1 sample per 40 samples. Blank samples were inserted at a rate of 1 sample per 20 samples and field duplicates were inserted at a rate of 1 sample per 20 samples. In addition, the laboratory undertook its own internal quality control checks. The QA/QC protocols did not identify any sampling or laboratory bias in the results. Data on collar position, sampling intervals and drill hole lithology were recorded in the field on a standard Microsoft Office excel worksheet in. The field data is stored in the company’s Cloud server. The company’s database manager validates the data and merges it with assay data into a relational database maintained by the company. The Company maintains in Perth all original digital field dat