Announcement PDF ASX Announcement 17 July 2023 HMS Sulphur RC Drilling Defines Shallow Mineralisation Striking Over 700m Key Points: • Final assay results have been received from the 30-hole (2,576m) reverse circulation (RC) drilling program testing the HMS Sulphur Prospect at Mt McClure in May-June 2023. • Infill and extensional results include: o YRLRC1131 - 9m @ 1.9g/t Au from 39m, including 6m @ 2.6g/t Au o YRLRC1130 - 9m @ 1.9g/t Au from 151m, including 2m @ 4.9g/t Au o YRLRC1138 - 5m @ 2.5g/t Au from 56m, including 3m @ 3.4g/t Au o YRLRC1123 - 4m @ 2.8g/t Au from 136m o YRLRC1132 - 6m @ 1.6g/t Au from 132m o YRLRC1133 - 2m @ 4.8g/t Au from 24m, including 1m @ 7.9g/t Au • Mineralisation has been defined over a strike length of 700m down to a maximum vertical depth of 150m on a nominal 50m x 50m spacing. • Mineralisation remains open at depth and along strike to the south. • Results will be used to update the geological model at HMS Sulphur and, together with previous results, will form the basis of an initial Mineral Resource Estimate planned for the December 2023 quarter. Commenting on the new results, Yandal Resources’ Managing Director Mr Tim Kennedy said: “HMS Sulphur is the most advanced prospect outside of the footprint of the historical open cuts. It was a compelling target due to the relatively shallow nature and simple geometry of mineralisation. Being immediately along strike from our Success MRE provides some synergies in terms of potential future development scenarios. We look forward to fully evaluating the results and with a view to producing an initial MRE in the December quarter.” Registered Address Board Members Gold Projects Yandal Resources Limited Tim Kennedy Managing Director/CEO Greg Evans Non-Exec Chairman Katina Law Non-Exec Director Greg Fitzgerald Company Secretary T +61 8 9389 9021 E yandal@yandalresources.com.au W www.yandalresources.com.au Ironstone Well (100% owned) Barwidgee (100% owned) Mt McClure (100% owned) Gordons (100% owned) Shares on Issue 157,803,079 Share Price $0.05 Market Cap $7.7M ASX Code YRL ACN 108 753 608 A P ABN 86 108 753 608 Level 1, U5/62 Ord Street West Perth WA 6005 PO Box 1104 Nedlands WA 6909 Yandal Resources Ltd (ASX: YRL, “Yandal Resources” or the “Company”) is pleased to advise that it has received final assay results from the RC drilling program completed at the HMS Sulphur Prospect (M 36/691) within the Mt McClure (MMC) Gold Project in May-June 2023. The Mt McClure Project is located 15km south-west of the historic Bronzewing gold mine and 10km from the Orelia gold mine, both owned by Northern Star Resources Ltd (ASX: NST) in the southern Yandal Belt (Figure 1). The project covers a total strike length of 17km of prospective stratigraphy and includes several shallow historical open cut pits. Mineralisation extending beneath and adjacent to the historical pits forms the basis of Mineral Resource Estimates totalling 2.25Mt @ 1.9g/t Au for 136,000oz(1). (1) Refer to the YRL ASX Announcements of 22 August, 6 September and 20 September 2022 for details of Resources Figure 1 – Location map of the Mt McClure Project showing mines and key prospects over regional geology ASX Announcement 17 July 2023 Page 2 The recent results at HMS Sulphur represent a successful RC in-fill program, with 26 of the 30 holes drilled returning significant intercepts (>0.5g/t Au). Results confirm mineralisation continuity over more than 700m of strike and down to a depth of 150m vertical, with mineralisation open at depth and to the south. Furthermore, higher-grade intercepts indicate that potential high-grade zones plunging moderately to the south are present across the prospect, similar to the adjacent Success Open Pit and nearby Orelia deposits. The progression of the HMS Sulphur prospect demonstrates the discovery potential across the Mt McClure Gold Project. Historic exploration focused on a single mineralised trend with early targets defined by shallow supergene enrichment. The stratigraphic complexity suggests there may be additional mineralised settings that may have been missed by previous explorers due to a focus on shallow supergene gold anomalism similar to existing deposits such as Success. The surface and regolith gold signatures dampened by potential supergene gold remobilisation/depletion has somewhat masked the surface expression of HMS Sulphur. Similarly, there may be further additional settings with near surface depletion that have not been followed up with deeper drilling or, in the case of low-level surface anomalies, not previously drill tested. Yandal Resources believes that there is potential for discoveries similar to HMS Sulphur and is committed to identifying and testing comparable targets as part of its overall exploration strategy at Mt McClure. TECHNICAL SUMMARY HMS Sulphur RC Drilling Results The HMS Sulphur RC program comprised 30 holes for 2,576m providing drill coverage at a nominal 50m x 50m spacing along a 700m strike length of the prospect. The program’s intent was to confirm mineralisation continuity and provide sufficient drill coverage to enable the completion of an initial Mineral Resource Estimate at HMS Sulphur. A combination of 1m and 4m composite RC samples were collected and submitted for Au analysis by fire assay, with 1m samples collected across the target intervals. Results for all submitted samples have been received. All significant assay results and collar locations are provided in Table 1 and Table 2, respectively. The results build on previous RC drilling completed in 2021 and 2022 (see ASX 23rd March 2021, 17th November 2022, and 23rd Feb 2023). Geology The HMS Sulphur prospect is situated in the footwall below the Success deposit, directly north of the historic open pit. Current interpretations suggest mineralisation occupies an iron rich chert and shale unit. Iron rich chert sub-crop has been mapped at the approximate surface projection of the host unit. This host unit dips approximately 50° to 60° to the east-northeast and overlies a basalt/dolerite sequence. Overlying the host unit is a sequence of felsic volcanic and fine-grained sediments. The regolith across the prospect is interpreted to be a partially eroded in-situ regime with a thin veneer of transported colluvium in places. Weathering is deep across the prospect, with fresh rock only evident at vertical depths greater than 100m. ASX Announcement 17 July 2023 Page 3 YRLRC1148 5m @ 1.2g/t Au from 30m YRLRC1144 6m @ 1.3g/t Au from 74m HMS Sulphur YRLRC1138 5m @ 2.5g/t Au from 56m Incl. 3m @ 3.4g/t Au YRLRC1132 6m @ 1.6g/t Au from 132m A’’ YRLRC1133 2m @ 4.8g/t Au from 24m incl. 1m @ 7.9g/t Au YRLRC1130 9m @ 1.9g/t Au from 151m incl. 2m @ 4.9g/t Au A’’ YRLRC1131 9m @ 1.9g/t Au from 39m incl. 6m @ 2.6g/t Au YRLRC1126 3m @ 1.3g/t Au from 146m YRLRC1125 5m @ 1.5g/t Au from 69m YRLRC1123 4m @ 2.8g/t Au from 136m YRLRC1122 5m @ 2.0g/t Au from 109m Success Figure 2 – HMS Sulphur drill hole plan showing location of May 2023 RC collars coloured by maximum downhole Au (g/t) with selected significant intercepts labelled. ASX Announcement 17 July 2023 Page 4 Mineralisation Mineralisation is similar in style to that of the adjacent Success deposit. Current interpretations indicate mineralisation occupies a 2m to 10m wide zone within an iron rich chert and shale unit. The geometry of mineralisation is relatively simple and concordant with stratigraphy. There is evidence of minor gold depletion down to 40m vertical. Mineralisation is characterised by quartz-carbonate veining and sulphides (dominantly pyrite, between 5-20% as veins or bands) or abundant iron-oxides (after pyrite). Quartzcarbonate veining includes massive veins and smaller vein sets, with some evidence of brecciation observed in chips. Combined with previous RC drilling and a small number of historic RC holes, mineralisation is now defined over 700m of strike and down to a vertical depth of 150m. Broader and higher-grade zones are evident, and like the Success deposit, appear to occupy a moderate south plunge. Mineralisation remains open both at depth and along strike to the south. Of particular interest is the southern projection of the host unit that is interpreted to occur just west of the Success deposit, within the footwall of the current 75Koz @ 1.9g/t Au Success MRE (refer to Yandal Resources Ltd ASX announcement dated 6 September 2022 for full details). Figure 3 - YRLRC1130 chip tray photo, showing 1m intervals from 151m to 160m (left to right), Au grade in g/t annotated in figure, with a length weighted intercept of 9m @ 1.9g/t Au. The intervals contain laminated to finely banded chert and shales, with cloudy grey quartz veining and 5-20% pyrite as fine disseminations, blebs, filling fractures, and laminations within veining. Higher grades are associated with increased pyrite, chlorite-silica alteration, and trace arsenopyrite. The interval ends above weakly to moderately sheared chlorite-carbonate-sericite altered mafic. Implications for Future Exploration The adjacent Success deposit displays strong supergene enrichment compared to HMS Sulphur, which shows evidence of gold depletion in the near surface. The occurrence of possible gold depletion in the upper part of the regolith profile across HMS Sulphur, despite its proximity to Success, suggests locally dynamic variation in supergene gold remobilisation. The above will prompt a review of low-level oxide anomalies adjacent to existing deposits across the Mt McClure Gold Project. Additionally, any other lowlevel linear near-surface anomalies will also be reviewed. ASX Announcement 17 July 2023 Page 5 ASX Announcement 17 July 2023 Page 6 Figure 4 – West facing longitudinal section across HMS Sulphur showing all RC drilling and significant results (north to the right side of page). Location of the Success Open Pit and Outline of the Success HW lode is indicated on the left of the long-section. Figure 5 – North facing cross-section through HMS Sulphur. See collar plan (Figure 2) and longitudinal section (Figure 4) for section location. Showing preliminary geological interpretation and significant intercepts. ASX Announcement 17 July 2023 Page 7 LOOKING AHEAD The Company has a very active Q3-Q4 2023 planned with priority exploration activities, including; 1. Complete interpretation of RC drilling at the HMS Sulphur Prospect Mount McClure that will enable an initial Mineral Resource Estimate for that prospect. 2. Arrange access approval for drill testing targets at Ironstone Well/Barwidgee, including Quarter Moon, Oblique and the New England prospects. RC drill test key prospects. 3. Follow-up significant air-core drill results over structural and geochemical targets at Mt McClure and Ironstone Well/Barwidgee. 4. Follow-up of targets highlighted in the recent independent geological targeting studies at Gordons (completed by Ben McCormack of Outlier Geoscience) and Ironstone Well/Barwidgee (completed by Mike Outhwaite of Lithify Pty Ltd). 5. Complete 3D modelling of historic and recent drilling data at MMC to establish controls on potential higher-grade plunging shoots for follow-up drill testing. Authorised by the board of Yandal Resources For further information please contact: Tim Kennedy Managing Director Yandal Resources Limited yandal@yandalresources.com.au ASX Announcement 17 July 2023 Greg Fitzgerald Company Secretary +61 8 9389 9021 yandal@yandalresources.com.au Page 8 About Yandal Resources Limited Yandal Resources listed on the ASX in December 2018 and has a portfolio of advanced gold exploration projects in the highly prospective Yandal and Norseman-Wiluna Greenstone Belts of Western Australia. Yandal Resources’ gold project locations. Yandal Resources Ltd - Mineral Resource Summary Deposit Ironstone Well Flushing Meadows1 Mt McClure Challenger2 Success3 Parmelia4 Sub-total - MMC Gordons Gordon’s Dam5 Grand-total6 Tonnes (‘000s) 2,141 2,141 Indicated Grade (g/t) Au (oz) 1.3 91,000 1.3 91,000 Inferred Grade (g/t) Au (oz) 5,245 1.1 177,000 718 1,255 252 2,225 1.9 1.9 2.1 1.9 365 7,835 1.7 1.3 Tonnes (‘000) Total Grade (g/t) Au (Oz) 7,386 1.1 268,000 44,000 75,000 17,000 136,000 718 1,255 252 2,225 1.9 1.9 2.1 1.9 44,000 75,000 17,000 136,000 20,000 333,000 365 9,976 1.7 1.3 20,000 424,000 Tonnes (000’s) Due to the effects of rounding totals may not represent the sum of the individual components 1. Reported above 0.5g/t Au lower cut-off grade, refer to Yandal Resources Ltd ASX announcement dated 4 November 2020 for full details. 2. Reported above 1.0g/t Au lower cut-off grade, refer to Yandal Resources Ltd ASX announcement dated 22 August 2022 for full details 3. Reported above 1.0g/t Au lower cut-off grade, refer to Yandal Resources Ltd ASX announcement dated 6 September 2022 for full details.4. Reported above 1.0g/t Au lower cut-off grade, refer to Yandal Resources Ltd ASX announcement dated 20 September 2022 for full details 5. Reported above 1.0g/t Au lower cut-off grade, refer to Yandal Resources Ltd ASX announcement dated 6 April 2023 for full details 6. All Resources are reported as global estimates, not constrained by optimised pit shells. ASX Announcement 17 July 2023 Page 9 Competent Person Statement The information in this document that relates to Exploration Results, geology and data compilation is based on information reviewed or compiled by Mr Christopher Oorschot, a Competent Person who is a Member of The Australasian Institute Geoscientists. Mr Oorschot is the Exploration Manager for the Company, is a full-time employee and holds options in the Company. Mr Oorschot 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 Oorschot consents to the inclusion in this announcement of the matters based on this information in the form and context in which it appears. The information in this announcement that relates to the Flushing Meadows, Mt McClure and Gordons Dam Mineral Resource Estimates is based on information compiled and generated by Andrew Bewsher, an employee of BM Geological Services Pty Ltd (“BMGS”). Both Andrew Bewsher and BMGS hold shares in the company. BMGS consents to the inclusion, form and context of the relevant information herein as derived from the original resource reports. Mr Bewsher has sufficient experience relevant to the style of mineralization and type of deposit under consideration and to the activity which is being undertaken to qualify as a Competent Person as defined in the 2012 Edition of the JORC ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’. YRL confirms that it is not aware of any new information or data that materially affects the information included in the original market announcement. The company confirms that the form and context in which the Competent Person’s findings are presented have not been materially modified from the original market announcement. Forward Looking Statements This document may contain certain forward-looking statements. Forward-looking statements include, but are not limited to, statements concerning Yandal Resources Limited’s (Yandal’s) current expectations, estimates and projections about the industry in which Yandal operates, and beliefs and assumptions regarding Yandal’s future performance. When used in this document, words such as “anticipate”, “could”, “plan”, “estimate”, “expects”, “seeks”, “intends”, “may”, “potential”, “should”, and similar expressions are forward-looking statements. Although Yandal believes that its expectations reflected in these forwardlooking statements are reasonable, such statements are subject to known and unknown risks, uncertainties and other factors, some of which are beyond the control of Yandal and no assurance can be given that actual results will be consistent with these forward-looking statements. Drilling results presented indicate geological potential for mineralisation but there can be no certainty that these results will eventually form part of a Mineral Resource Estimate. ASX Announcement 17 July 2023 Page 10 Table 1 – HMS Sulphur - Summary of significant RC drilling assay results (>0.1g/t Au). Prospect Hole Id Sample type From (m) To (m) Interval (m) Au (g/t) HMS Sulphur YRLRC1121 RC 1m 37 38 1 0.7 HMS Sulphur YRLRC1121 RC 1m 40 41 1 0.5 HMS Sulphur YRLRC1122 RC 1m 109 114 5 2.0 HMS Sulphur YRLRC1123 RC 1m 136 140 4 2.8 HMS Sulphur YRLRC1124 RC 1m 37 39 2 0.8 HMS Sulphur YRLRC1125 RC 1m 62 63 1 0.7 HMS Sulphur YRLRC1125 RC 1m 65 67 2 0.9 HMS Sulphur YRLRC1125 RC 1m 69 74 5 1.5 HMS Sulphur YRLRC1126 RC 1m 141 143 2 0.6 HMS Sulphur YRLRC1126 RC 1m 146 149 3 1.3 HMS Sulphur YRLRC1127 RC 1m 42 43 1 0.6 HMS Sulphur YRLRC1127 RC 1m 48 50 2 0.9 HMS Sulphur YRLRC1128 RC 1m 80 84 4 0.6 HMS Sulphur YRLRC1128 RC 1m 88 89 1 1.4 HMS Sulphur YRLRC1129 RC 1m 105 106 1 4.5 HMS Sulphur YRLRC1129 RC 1m 117 118 1 0.7 HMS Sulphur YRLRC1129 RC 1m 121 123 2 0.8 HMS Sulphur YRLRC1130 RC 1m 151 160 9 1.9 including 156 158 2 4.9 HMS Sulphur YRLRC1131 RC 1m 11 12 1 0.5 HMS Sulphur YRLRC1131 RC 1m 39 48 9 1.9 including 42 48 6 2.6 HMS Sulphur YRLRC1132 RC 1m 122 123 1 1.0 HMS Sulphur YRLRC1132 RC 1m 129 130 1 0.7 HMS Sulphur YRLRC1132 RC 1m 132 138 6 1.6 HMS Sulphur YRLRC1133 RC 1m 24 26 2 4.8 including 24 25 1 7.9 HMS Sulphur YRLRC1134 RC 1m 123 126 3 0.6 HMS Sulphur YRLRC1135 RC 1m 12 13 1 1.2 HMS Sulphur YRLRC1135 RC 1m 20 21 1 0.6 HMS Sulphur YRLRC1135 RC 1m 27 28 1 0.6 HMS Sulphur YRLRC1136 RC 1m 83 85 2 1.0 HMS Sulphur YRLRC1137 RC 1m 33 35 2 1.7 HMS Sulphur YRLRC1138 RC 1m 56 61 5 2.5 including 57 60 3 3.4 HMS Sulphur YRLRC1139 RC 1m 12 13 1 2.2 HMS Sulphur YRLRC1140 RC 1m 108 110 2 0.9 HMS Sulphur YRLRC1141 RC 1m NSA HMS Sulphur YRLRC1142 RC 1m 56 57 1 0.8 HMS Sulphur YRLRC1143 RC 1m NSA HMS Sulphur YRLRC1144 RC 1m 74 80 6 1.3 HMS Sulphur YRLRC1145 RC 1m NSA HMS Sulphur YRLRC1146 RC 1m NSA HMS Sulphur YRLRC1147 RC 1m 78 80 2 1.2 HMS Sulphur YRLRC1148 RC 1m 30 35 5 1.2 ASX Announcement 17 July 2023 Comment finished @ EOH Page 11 Prospect Hole Id Sample type From (m) To (m) Interval (m) Au (g/t) HMS Sulphur YRLRC1149 RC 1m 59 60 1 0.7 HMS Sulphur YRLRC1150 RC 1m 27 28 1 0.5 HMS Sulphur YRLRC1150 RC 1m 31 32 1 0.6 HMS Sulphur YRLRC1150 RC 1m 36 37 1 0.9 Comment Table 2 – HMS Sulphur RC collar location summary for this release. Prospect Hole ID Hole type East (m) North (m) Azimuth (degrees) Dip (degrees) Total depth (m) HMS Sulphur YRLRC1121 RC 296266 6955192 256 -60 48 HMS Sulphur YRLRC1122 RC 296337 6955222 259 -60 120 HMS Sulphur YRLRC1123 RC 296364 6955227 255 -60 150 HMS Sulphur YRLRC1124 RC 296254 6955227 258 -60 42 HMS Sulphur YRLRC1125 RC 296287 6955237 253 -60 75 HMS Sulphur YRLRC1126 RC 296366 6955253 252 -60 160 HMS Sulphur YRLRC1127 RC 296248 6955282 256 -60 50 HMS Sulphur YRLRC1128 RC 296288 6955287 255 -60 100 HMS Sulphur YRLRC1129 RC 296324 6955297 258 -60 140 HMS Sulphur YRLRC1130 RC 296361 6955306 258 -60 180 HMS Sulphur YRLRC1131 RC 296215 6955377 253 -60 60 HMS Sulphur YRLRC1132 RC 296311 6955398 255 -60 150 HMS Sulphur YRLRC1133 RC 296184 6955417 258 -60 30 HMS Sulphur YRLRC1134 RC 296285 6955445 256 -60 140 HMS Sulphur YRLRC1135 RC 296160 6955461 249 -60 36 HMS Sulphur YRLRC1136 RC 296232 6955480 254 -60 100 HMS Sulphur YRLRC1137 RC 296163 6955516 254 -60 50 HMS Sulphur YRLRC1138 RC 296189 6955524 256 -60 70 HMS Sulphur YRLRC1139 RC 296129 6955556 256 -60 50 HMS Sulphur YRLRC1140 RC 296222 6955584 261 -60 130 HMS Sulphur YRLRC1141 RC 296132 6955608 259 -60 56 HMS Sulphur YRLRC1142 RC 296159 6955617 257 -60 80 HMS Sulphur YRLRC1143 RC 296110 6955657 258 -60 47 HMS Sulphur YRLRC1144 RC 296161 6955668 259 -60 100 HMS Sulphur YRLRC1145 RC 296107 6955708 255 -59 50 HMS Sulphur YRLRC1146 RC 296137 6955716 256 -60 100 HMS Sulphur YRLRC1147 RC 296129 6955762 257 -60 100 HMS Sulphur YRLRC1148 RC 296073 6955787 259 -60 42 HMS Sulphur YRLRC1149 RC 296097 6955791 258 -60 75 HMS Sulphur YRLRC1150 RC 296189 6955416 256 -60 45 ASX Announcement 17 July 2023 Page 12 Appendix 1 – Mt McClure JORC Code (2012) Table 1, Section 1 and 2 Mr Christopher Oorschot, Exploration Manager of Yandal Resources compiled the information in Section 1 and Section 2 of the following JORC Table 1 and is the Competent Person for those sections. The following Table and Sections are provided to ensure compliance with the JORC Code (2012 edition) requirements for the reporting of Exploration Results. Section 1 Sampling Techniques and Data 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. • ASX Announcement 17 July 2023 A total of 58 Reverse Circulation (RC) holes have been drilled across the HMS Sulphur Prospect for a total of 5,299m. 45 of these RC holes were completed by Yandal Resources for a total of 4,142m, while there are 13 historic RC holes for a total of 1,157m. Drill holes vary in depth from 30m to 180m. Yandal Resources (YRL) RC Samples were collected via a rig-mounted static cone splitter, splitting the sample in an approximate 87.5%/12.5% ratio. The approximate 12.5% split is retained for a 1m sample. 1m samples are then sent to a lab for further analysis. 4m composites were collected outside of mineralised intervals. 4m composite samples were collected by using a scoop or spear to collect a sample from the 1m interval 87.5% (bulk) split retained in ordered and labelled green bags. Samples from every four metres are combined to form a four-metre composite which are then sent to the lab for analysis. If the composite samples are anomalous for gold, then individual 1m samples are collected from the 4m interval and submitted to a lab for analysis. For historical drilling, sampling practices by previous operators are assumed to be industry standard at that time. Sampling procedures would be comparable to those applied by Yandal Resources as per the above but with variations in the type of splitter used etc. For YRL RC drilling, the cone splitter is regularly cleaned and inspected. The 1m bulk samples are stored in labelled green bags and laid out in drill order. These bulk samples are regularly inspected for contamination, and the volume of the bulk sample is monitored. These bulk samples are retained until all results are received and may be used to collect additional field duplicates to verify lab results, logged geology or any other form of analysis. If the bulk sample appears visually low in volume or weight, this is recorded with the sample details. The same applies for damp or wet samples. For all results, RC drilling was used to obtain 1m samples from which a portion, between 1-3kg in weight, was crushed and pulverised to produce a 50g charge for fire assay with an AAS (atomic absorption spectroscopy) finish for gold determination with a 0.01ppm detection limit. Page 13 Criteria JORC Code explanation Commentary Drilling techniques Drill type (e.g. core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (e.g. core diameter, triple or standard tube, depth of diamond tails, facesampling bit or other type, whether core is oriented and if so, by what method, etc). • • For YRL RC drilling, a 139mm diameter face sampling bit and hammer was used. For historical RC drilling, a 5’ ¼ inch face sampling bit and hammer was used. Drill sample recovery Method of recording and assessing core and chip sample recoveries and results assessed. • For YRL holes, RC drilling recoveries are visually assessed by the supervising geologist, and any lowvolume or weight samples are recorded, along with any damp or wet samples. Drill depths are routinely verified at the completion of each drill rod (every 6m). The cone splitter is checked for each drill site to ensure it is completely upright and level. Sample collection from the splitter by drilling off-siders is monitored for any inefficiencies. For deeper holes, larger drilling equipment is used, with boosted air pressure, to ensure samples are recovered, and groundwater is reasonably controlled. Based on current data, no grade bias is associated with lower/higher volume/weight samples. There have only been minimal wet or damp samples across all YRL drilling. For historic RC drilling, exact records of measures applied to manage or monitor sample recoveries have not been preserved. It is assumed that previous project operators used industry standard procedures comparable to those used by YRL above. For YRL drilling, all RC holes have been logged in full by a qualified and experienced geologist. RC chips and fines from each 1m interval drilled are inspected and logged for colour, weathering, lithology, deformation, veining and mineralisation. All 1m samples are wet-sieved and retained in labelled and annotated chip trays. Chip trays are stored on-site for review and then transported to Perth for longterm storage. The quality of logging information is considered sufficient to support appropriate Mineral Resource Estimation studies. Historic geological logging is limited in detail but provides sufficient information regarding lithology, weathering, and mineralisation. It is assumed that previous project operators used industry standard logging procedures comparable to those used by YRL above. Data captured through geological logging by a geologist is qualitative in nature. In addition to geological logging, the magnetic susceptibility of each interval is measured using a KT-10 magnetic susceptibility metre, with a sensitivity of 1x10-6 SI Units. Magnetic susceptibility readings are quantitative in nature. In addition to geological logging, down-hole gamma probes were applied to a select number of holes that remained open post-drilling to collect down-hole density data, accurate to within 0.1g/ccm. Gamma and density data are quantitative in nature. YRL RC drilling utilised a rig mounted cone splitter installed directly below an in line with the rig mounted cyclone. A 1-3kg sub sample is collected into a calico bag labelled with a unique alpha-numeric ID. Most samples collected were dry, if samples were damp or wet, this was noted with the sample records. Historic samples were likely collected using either a rig mounted or portable riffle splitter. For all YRL RC drilling, samples are dried at 100°C to constant mass, crushed to <10mm and pulverised 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. 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. • • • • • • • Sub-sampling techniques and sample preparation 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. ASX Announcement 17 July 2023 • • Page 14 Criteria JORC Code explanation For all sample types, the nature, quality and appropriateness of the sample preparation technique. Quality control procedures adopted for all sub-sampling 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. Commentary • • • Whether sample sizes are appropriate to the grain size of 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, calibra