Announcement PDF WEST COASTSILVER LIMITED ASX | WCE ACN: 155 472 834 REGISTERED OFFICE Level2,10 Ord Street WestPerth, WA 6005 POBox1227, WestPerth WA 6872, Australia info@westcoastsilver.com.au +61 8 9322 3383 westcoastsilver.com.au ASX:WCE ANNOUNCEMENT 18 December 2025 Geological Indicators for Silver in Aircore Drilling: Assay Update • Aircore drilling at the Elizabeth Hill Silver Project has been completed with 76 holes for 1,060m, successfully testing multiple near-mine and regional prospects. Aircore is a rapid, shallow, cost-effective reconnaissance exploration technique. • Strong geological indicators, similar to those seen at the Elizabeth Hill mine, identified in logging of aircore chips and core, including: • Intense chlorite and silica alteration. • Carbonate veining. • Iron oxide staining is associated with interpreted structures. • Fertile ultramafic–granite contact confirmed at NM2, NM5 and NM6 prospects consistent with the structural setting of historical high grade silver mineralisation at Elizabeth Hill (Figure 1). • Aircore drilling intersected alteration and lithologies at NM5 prospect interpreted to be the near surface continuation of the contact position in historical high-grade drill hole: • 2m @ 1,550g/t Ag from 108m (AMEHRC012) located 300m from the Elizabeth Hill mine. • NM5 and NM6 prospects have been upgraded for priority follow-up exploration, based on the confirmation of favourable geology and alteration. • Aircore assay results are expected to be returned by the end of February 2026. • Samples from the recently completed diamond drilling are currently undergoing laboratory QA/QC checks, with assay results expected mid to late January 20261 . 1 Refer ASX Announcement dated 24 November 2025. Highlights ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 2 West Coast Silver Limited (ASX: WCE) (‘West Coast Silver’ or the ‘Company’) is pleased to advise that its aircore (AC) drill program at the high-grade Elizabeth Hill Silver Project in the Pilbara, to define targets surrounding the historical mine and along the Munni Munni margin has been completed with 76 holes for 1,060m. The aircore program has intersected strong geological indicators, similar to those seen at the Elizabeth Hill mine. Samples have been submitted for assay with results due by the end of February. The program followed completion of the 1,015m, Phase 2 diamond drilling campaign at the Elizabeth Hill mine (testing near-surface high-grade mineralisation, and prospective areas at depth below historical workings), that intersected visible native silver, for which assays are pending. Commenting on the results, Executive Chairman Bruce Garlick said: “We are very encouraged by the outcomes of the aircore program, which has successfully confirmed multiple zones with strong geological indictors at several high-priority near-mine prospects at Elizabeth Hill. The drilling has validated key structural and lithological controls, including ultramafic–granite contacts, alteration, and carbonate veining that are consistent with the setting of historical high-grade silver mineralisation. We now eagerly await assay results to further refine targeting for the 2026 drill program, with the objective of identifying a repeat of the Elizabeth Hill deposit. This program marks the conclusion of our 2025 exploration activities and represents the third successful drilling campaign completed during the year. When combined with the strong assay results from the Phase 1 diamond drilling program, and the visual observations of native silver with assays pending from Phase 2, the Company is well positioned to advance Elizabeth Hill through a focused and high-impact exploration program in 2026”. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 3 Figure 1: Near-mine prospects: geology, geochemistry and aircore drill hole locations ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 4 Figure 2: Near mine geophysics, geochemistry and aircore drill hole locations (overlain on detailed drone magnetics Total Magnetic Intensity data - reduced to the pole) ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 5 Aircore Drill Program Aircore (AC) drilling is a rapid, cost-eƯective, low-impact reconnaissance drilling method commonly used to test shallow targets below deeply weathered and alluvial surface material. The objectives of the aircore drill program were to (i) confirm structural/stratigraphic controls along the Munni Munni fault and ultramafic/granite contact, highlighted by drone magnetics and other integrated geoscientific data, and (ii) identify zones of anomalous geochemistry for follow up drilling and or other exploration works. The near mine prospects tested with the aircore drilling are highlighted in Figures 1 and 2 (refer to WCE ASX Announcement dated 13 November 2025). The drilling tested the NM1 prospect, north of the historical Elizabeth Hill silver mine, for extensions of the mineralisation controlled by the Munni Munni fault (Figure 1 and Figure 2). Logging of AC chips identified altered, chloritised and silicified granite in the aircore drill line north of historical drill hole 22AMC011 (4m @ 60g/t Ag from surface), possibly representing alteration associated with the Munni Munni fault. Aircore drilling also tested the southern extension of the Munni Munni fault and delineated the fertile ultramafic/granite contact south of the Elizabeth Hill Silver mine at the NM2, NM5 and NM6 prospects (Figure 1 and Figure 2). At the NM5 prospect, geological logging identified strongly chlorite altered pyroxenite (ultramafic rock) containing carbonate veins adjacent to the granite contact, approximately 50m west of the collar of historical drill hole AMEHRC012 (2m @ 1,550g/t Ag from 108m). The ultramafic/granite contact intersected in the AC drilling is interpreted to be the near surface continuation of the contact position intersected in AMEHRC012. The two AC holes planned to test the strong soil anomaly and ultramafic/granite contact at the NM4 prospect failed to reach the contact due to rock conditions (Figure 1 and Figure 2). This prospect will need to be reassessed in terms of future exploration. At the RS12 North prospect, aircore holes were planned to test a strong soil anomaly adjacent to the ultramafic/granite contact and mapped structures within the ultramafic rocks. While the drilling intersected a granite/ultramafic contact that are related to thin (0.5-1m wide) granitic dykes it did not test the main contact position. This prospect will need to be reassessed in terms of future exploration. At RS12 South, drilling targeted a break in the magnetic signature of the rocks, near coincident soil anomaly and electromagnetic anomaly. A traverse of three holes tested the target zone however no clear signs to explain this anomalous area was evident from geological logging of the AC chips. Drilling intersected strongly chlorite altered pyroxenites and trace (<0.5%) chalcopyrite (Figure 1 and Figure 2). A single drill hole was targeted between the RS12 South and RS13 prospects aimed to test an interpreted structure and mapped calcite veins in pyroxenite outcrop. Drilling intersected iron oxide staining in pyroxenite from 8m to 12m, which may represent a structure, and chloritised and silicified pyroxenite with 2-5% sulphides (pyrite, chalcopyrite) from 22m to 24m. This area will need to be reassessed in terms of future exploration. Cautionary Statement WCE emphasises that visual estimates of mineral abundance should not be regarded as a proxy or substitute for laboratory analyses, particularly when concentrations or grades are of primary economic significance. Furthermore, visual estimates do not yield information concerning impurities or detrimental physical properties that are pertinent to valuations. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 6 Laboratory Testing Samples from the AC drilling have been sent for laboratory assaying with results expected to be returned by the end of February 2026. Result timeframes may vary pending lab analysis requirements for further testing. Update on Assays for Diamond Drilling Samples from the diamond drilling program, testing shallow historical high-grade silver, are currently undergoing QA/QC checks at the laboratory with some samples sent to ALS Canada for additional test work. Indications are these will be finalised and are expected to be received in mid to late January 2026. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 7 The Elizabeth Hill Project Elizabeth Hill is one of Australia’s high-grade silver projects and has a proven production history outlined below: • High grades enabled low processing tonnes: 1.2Moz of silver was produced from just 16,830t of ore at a head grade of 2,194g/t (70.5 oz/t Ag)1 . • Previous mining operation ceased in 2000: because of low silver prices (US$5)2 . • Simplistic historical processing technique: native silver was recovered via low-cost gravity separation techniques. • Untapped potential remains in ground with deposit open at depth and recent consolidation of land package oƯers potential to discover more Elizabeth Hill style deposits. • Tier 1 Mining Jurisdiction located on a mining lease with potential processing option at the nearby Radio Hill site. Figure 3 - Tenement Location Through the consolidation of the surrounding land packages into a single contiguous 180km2 package significant exploration and growth potential exists both near mine and regionally. The land package holds a significant portion of the Munni Munni fault system, and other fault systems subparallel to the Munni Munni fault system, which are considered prospective for Elizabeth Hill look-a-like silver deposits. 1 WAMEX Annual Report,1 April 2014 to 31 March 2015, Elizabeth Hill Silver Project, Global Strategic Metals NL, p16 2 www.kitco.com/charts/silver ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 8 This ASX announcement has been authorised for release by the Board of Directors of West Coast Silver Limited. For further information, please contact: Bruce Garlick Executive Director West Coast Silver Limited E: info@westcoastsilver.com.au Competent Person Statement The information in this announcement that relates to Exploration Results is based on information reviewed by Mr Max Nind who is a Member of the Australian Institute of Geoscientists. Mr Nind is a consultant to West Coast Silver and a full-time employee of ERM Australia Consultants Pty Ltd. Mr Nind has suƯicient experience that is relevant to the style of mineralisation and type of deposits under consideration, and to the activity being undertaken to qualify as a Competent Personas defined in the 2012 Edition of the Joint Ore Reserves Committee (JORC) ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’, and a Specialist under the VALMIN Code 2015 Edition of the ‘Australasian Code for Public Reporting of Technical Assessments and Valuations of Mineral Assets’. Mr Nind consents to the inclusion in the announcement of the matters based on this information and in the form and context in which it appears. Forward-Looking Statements Statements in this announcement which are not statements of historical facts, including but not limited to those relating to the proposed transaction, are forward-looking statements. These statements instead represent management’s current expectations, estimates and projections regarding future events. Although management believes the expectations reflected in such forward-looking statements are reasonable, forward-looking statements are based on the opinions, assumptions and estimates of management at the date the statements are made and are subject to a variety of risks and uncertainties and other factors that could cause actual events or results to diƯer materially from those projected in the forward-looking statements. Accordingly, investors are cautioned not to place undue reliance on such statements. Cautionary Statement This document is confidential and may not be reproduced, redistributed or passed on, directly or indirectly. This document is neither a prospectus nor an oƯer to subscribe for fully paid ordinary shares. West Coast Silver and its directors, employees and consultants make no representations or warranty as to the accuracy, reliability or completeness of this document, and have no liability, including liability to any person by reason of negligence of, or contained in or derived from, or for any omissions from this document, except liability under statute that cannot be excluded. This document contains reference to certain targets and plans of West Coast Silver which may or may not be achieved. The performance of West Coast Silver may be influenced by a number of factors, uncertainties and contingencies, many of which are outside the control of the Company and its directors, staƯ and consultants. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 9 Appendix 1 Location and hole details for recent West Coast air core drill holes. Hole Name Easting (m) Northing (m) Elevation (m) End of Hole Depth (m) Azimuth (°) Dip (°) 25WCAC001 487,020 7,667,955 86.4 26 270 -60 25WCAC002 487,020 7,667,964 86.3 24 270 -60 25WCAC003 487,044 7,667,965 86.1 3.5 270 -60 25WCAC004 487,033 7,667,985 85.1 3.5 270 -60 25WCAC005 487,046 7,667,989 84.8 5 270 -60 25WCAC006 487,039 7,668,006 84.4 3 270 -60 25WCAC007 487,030 7,668,095 83.5 5 270 -60 25WCAC008 487,025 7,668,095 83.4 8.5 270 -60 25WCAC009 487,020 7,668,096 85.4 11 270 -60 25WCAC010 487,010 7,668,096 85.4 9 270 -60 25WCAC011 487,005 7,668,096 83.4 15 270 -60 25WCAC012 487,002 7,668,095 83.5 8.5 270 -60 25WCAC013 487,036 7,668,095 83.4 4 270 -60 25WCAC014 487,001 7,668,079 83.5 7 090 -60 25WCAC015 487,004 7,668,081 83.5 2.5 270 -60 25WCAC016 487,006 7,668,081 83.5 7 270 -60 25WCAC017 487,010 7,668,053 83.8 5 270 -60 25WCAC018 487,015 7,668,053 83.8 4 270 -60 25WCAC019 487,020 7,668,053 83.8 5 270 -60 25WCAC020 487,024 7,668,053 83.8 5.5 270 -60 25WCAC021 487,029 7,668,053 83.8 3 270 -60 25WCAC022 487,034 7,668,053 83.8 7 270 -60 25WCAC023 487,029 7,668,031 84.1 4 270 -60 25WCAC024 487,038 7,668,031 84.1 3 270 -60 25WCAC025 487,028 7,667,986 85.0 8 270 -60 25WCAC026 487,029 7,668,007 84.4 4 270 -60 25WCAC027 487,100 7,668,134 82.8 4.5 270 -60 25WCAC028 487,095 7,668,134 82.8 3 270 -60 25WCAC029 487,105 7,668,134 82.9 5.5 270 -60 25WCAC030 486,921 7,667,622 87.3 6 135 -60 25WCAC031 486,960 7,667,667 86.6 12 270 -60 25WCAC032 486,950 7,667,666 86.7 18 270 -60 25WCAC033 486,940 7,667,666 86.9 7.5 270 -60 25WCAC034 486,930 7,667,666 86.9 9 270 -60 25WCAC035 486,937 7,667,666 86.9 6 270 -60 25WCAC036 486,989 7,667,667 86.5 27 270 -60 ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 10 Hole Name Easting (m) Northing (m) Elevation (m) End of Hole Depth (m) Azimuth (°) Dip (°) 25WCAC037 486,864 7,667,618 87.6 3 135 -60 25WCAC038 486,872 7,667,609 87.6 6 135 -60 25WCAC039 486,883 7,667,599 87.7 21 135 -60 25WCAC040 486,930 7,667,607 87.4 19 135 -60 25WCAC041 486,951 7,667,589 87.6 25 135 -60 25WCAC042 486,865 7,667,577 88.0 18 270 -60 25WCAC043 486,870 7,667,577 88.0 18 270 -60 25WCAC044 486,865 7,667,528 88.5 19 270 -60 25WCAC045 486,870 7,667,480 88.9 36 270 -60 25WCAC046 486,865 7,667,440 89.3 30 270 -60 25WCAC047 486,870 7,667,396 90.0 30 270 -60 25WCAC048 486,870 7,667,363 90.7 48 270 -60 25WCAC049 486,914 7,667,367 92.3 30 270 -60 25WCAC050 486,901 7,667,367 91.7 20 270 -60 25WCAC051 486,884 7,667,365 91.1 20 270 -60 25WCAC052 486,911 7,667,327 94.7 20 270 -60 25WCAC053 486,901 7,667,331 93.7 16 270 -60 25WCAC054 486,886 7,667,326 92.9 33 270 -60 25WCAC055 486,870 7,667,324 92.0 51 270 -60 25WCAC056 486,885 7,667,282 94.9 8 270 -60 25WCAC057 487,421 7,667,666 95.2 8 090 -60 25WCAC058 487,469 7,667,611 97.1 11 042 -60 25WCAC059 487,625 7,666,748 102.8 4 100 -60 25WCAC060 487,611 7,666,752 101.1 13 100 -60 25WCAC061 487,636 7,666,696 105.5 10 100 -60 25WCAC062 487,631 7,666,674 104.7 18 100 -60 25WCAC063 487,523 7,666,495 101.2 19.5 100 -60 25WCAC064 487,534 7,666,493 100.8 13 100 -60 25WCAC065 487,549 7,666,487 100.5 20 100 -60 25WCAC066 487,514 7,666,276 101.5 24 135 -60 25WCAC067 487,665 7,666,395 97.5 12 060 -60 25WCAC068 486,940 7,667,598 87.5 31 135 -60 25WCAC069 486,962 7,667,579 87.6 24 135 -60 25WCAC070 486,881 7,667,578 87.9 15 270 -60 25WCAC071 486,883 7,667,599 87.6 14 315 -60 25WCAC072 486,879 7,667,603 87.7 12 315 -60 25WCAC073 486,931 7,667,607 87.3 7 315 -60 25WCAC074 486,935 7,667,603 87.3 9 315 -60 25WCAC075 486,866 7,667,561 88.1 7 270 -60 25WCAC076 486,872 7,667,593 87.7 28 270 -60 Note: GDA94 Zone 50 coordinate system WEST COASTSILVER LIMITED ASX | WCE ACN: 155 472 834 REGISTERED OFFICE Level2,10 Ord Street WestPerth, WA 6005 POBox1227, WestPerth WA 6872, Australia info@westcoastsilver.com.au +61 8 9322 3383 westcoastsilver.com.au Appendix 2 JORC Code, 2012 – Table 1 – Elizabeth Hill Silver Project – Aircore Drilling 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 (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 relatively simple (e.g. ‘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 (e.g. submarine nodules) may warrant disclosure of detailed information. • Wallis Drilling was engaged to complete aircore drilling at the Elizabeth Hill Project using the Mantis 200 drill rig. • Aircore drilling aimed to obtain 1m geochemical samples at prospects under cover material. • Standard industry sampling techniques were applied to the aircore samples. • A hydraulic rotary sample splitter on the rig was used to obtain a representative 2.5kg – 3.5kg sample of every metre drilled in a pre-numbered calico bag. The bags were placed on the ground next to the remainder of the 1m sample that was collected in a bucket. The samples were placed in order in rows of 10 samples. • Samples of each metre drilled were sieved and representative chip samples were collected and placed in numbered chip trays. • When small amounts of water were encountered in the hole, samples continued to be collected with care taken to obtain as representative a sample per metre as possible. Notes were made on logging sheets where water was intersected in a drill hole. Any contamination was also recorded in the drill logs. • For most holes, sample compositing was also completed on 2m, 3m, 4m and 5m sample intervals. When compositing, a uniquely numbered calico bag was used and the sample was collected by using a scoop through the sample pile to ensure the sample was as representative as possible. • Certified Reference Material (CRM) standards, and blanks were inserted approximately every 25 and 50 samples, respectively. No ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 12 Criteria JORC Code explanation Commentary field duplicates were collected as the drilling was deemed reconnaissance in nature. • Samples are to be oven dried as required, fine crushed to 90% passing 3.15mm, pulverised, and split to obtain a nominal 500g sub sample for assaying. The remainder of the sample is to be retained as a coarse reject. 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). • Aircore drilling was completed by Wallis Drilling. • Holes were drilled at various azimuths and dips to varying depths. • Hole diameter was BQ size (56mm). • Sample returns up innertube, preventing cross contamination. Cores up to 300mm long can be cut in favourable ground, otherwise, sample is returned in large chips. 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 semi-qualitative estimate of drill sample recovery was recorded in the drill logs. • Some drill intervals were wet and were recorded in the drill logs. • Any relationship between sample recovery and grade is unknown, as the samples are still to be assayed. Logging • 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. • All aircore drill holes have been geologically logged for lithology, weathering, rock type, alteration, mineralisation, shearing & foliation, and any other features of the samples using sieved rock chips from the drill sample piles. The level of geological detail is commensurate with the nature and limitations of this reconnaissance drilling technique. • The geological logs for all drill holes can be considered qualitative in nature. • Logging is of a suƯicient quality for the information to be used in future Mineral Resource Estimates, mining studies and metallurgical studies. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 13 Criteria JORC Code explanation Commentary • Representative chips of each metre drilled were collected and placed in numbered chip trays. • The chip trays were photographed wet. Subsampling techniques and sample preparation • If core, whether cut or sawn and whether quarter, half or all core taken. • If non-core, whether riƯled, 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 in-situ material collected, including for instance results for field duplicate/second-half sampling. • Whether sample sizes are appropriate to the grain size of the material being sampled. • A hydraulic rotary sample splitter on the aircore rig was used to obtain a representative 2.5kg – 3.5kg sample of every metre drilled in a pre-numbered calico bag. • Based on geological logging per hole, selected 1m samples were collected for the 48 element assaying with the remainder secured as back up samples to any composite samples collected. If not sampled on a 1m basis, the rest of the hole was sampled as 2m or 3m composites. • For the gold assaying, aircore holes were sampled as 3m, 4m or 5m composite intervals. • All sampling excluded the transported cover rocks. • When compositing, a uniquely numbered calico bag was used and the sample was collected by using a scoop through the sample pile to ensure the sample was as representative as possible. • One, two and three metre composite samples were sent to the ALS Geochemistry laboratory in Perth for analysis by method ME- MS61L. • Three, four and five metre composite samples were sent for fire assay gold analysis to the ALS Geochemistry laboratory in Perth by method Au-AA24. • Samples are to be oven dried as required, fine crushed to 90% passing 3.15mm, pulverised, and split to obtain a nominal 500g sub sample for assaying. The remainder of the sample is to be retained as a coarse reject. • Certified Reference Material (CRM) standards, and blanks were inserted approximately every 25 and 50 samples, respectively. No field duplicates were collected as the drilling was deemed reconnaissance in nature. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 14 Criteria JORC Code explanation Commentary • The 2.5kg – 3.5kg sample size is considered appropriate for the material being sampled. Quality of assay data and laboratory tests • 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. • No assay data is being reported. • A 0.25g split of the samples will be analysed with the ALS ME- MS61L method that provides ALS's lowest detection levels (0.002g/t for Ag) from a four-acid digestion with 48 elements determined by Inductively coupled plasma mass spectrometry (ICP-MS). • ME-MS61L is considered a near total digestion. • A 50g split of the 3m, 4m, and 5m gold composite samples will be analysed by ALS using the fire assay method Au-AA24 and determined with an atomic absorption spectrometer (AAS). • Fire assay is considered a total digestion or full decomposition method for gold, as the high-temperature fusion process breaks down the entire sample matrix. • Standards and blanks were inserted in the sampling sequence for analysis with the ME-MS61L and Au-AA24 methods. Verification of sampling and assaying • 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 assay data is being reported. • No historical drill holes were twinned. • Drill collar data, sample information, and logging data have been verified, compiled, and validated by an ERM Database Manager who is separate to the persons conducting the logging and sampling. Location of data points • Accuracy and quality of surveys used to locate drill holes (collar and down-hole surveys), trenches, mine workings and other locations used in Mineral Resource estimation. • Specification of the grid system used. • Quality and adequacy of topographic control. • A Mineral Resource or Ore Reserve is not determined. • Aircore drill collars were located using a diƯerential GPS (DGPS). Expected accuracy is +/- 0.35m for northing and easting and 0.25m for RL. • The GDA94 Zone 50 datum is used as the coordinate system. • Topographic control is from DTM and DGPS. Data spacing and distribution • Data spacing for reporting of Exploration Results. • No Mineral Resource or Ore Reserve are reported. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 15 Criteria JORC Code explanation Commentary • Whether the data spacing, and distribution is suƯicient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied. • Whether sample compositing has been applied. • Drill lines were nominally spaced, 40m or 80m apart. Holes along lines were spaced 15m apart but allowance was made to close the spacing to 5m apart, dependent on the depth of the holes. • Two and three metre composite samples were collected for most holes for analysis by method ME-MS61L. • Three, four and five metre composite samples were collected for most holes for fire assay gold analysis by method Au-AA24. Orientation of data in relation to geological structure • Whether the orientation of sampling achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type. • If the relationship between the drilling orientation and the orientation of key mineralized structures is considered to have introduced a sampling bias, this should be assessed and reported if material. • The aircore drilling was completed with holes dipping at 60 degrees. • Angled drilling was used to investigate structures and the ultramafic/granite contact. • The drill orientation is not expected to have introduced any sampling bias. Sample security • The measures taken to ensure sample security. • Aircore samples were taken by Company personnel to a secure yard in Karratha then freighted to the ALS Geochemistry laboratory in Perth. Sample security is by way of chain of custody. Audits or reviews • The results of any audits or reviews of sampling techniques and data. • No audits were undertaken by West Coast Silver or any independent parties. ASX:WCE ANNOUNCEMENT 18 December 2025 WEST COAST SILVER LIMITED ASX | WCE Page 16 Section 2 Reporting of Exploration Results (Criteria listed in the preceding section also apply to this section.) Criteria JORC Code explanation Commentary Mine