Announcement PDF ASX Release 17 September 2025 CHEMICAL ASSAYS CONFIRM CONTINUOUS, HIGH-GRADE URANIUM MINERALISATION AT OASIS Highlights  Laboratory chemical analysis from diamond drill-hole 25GRV002, Greenvale’s second drillhole completed at the Oasis Uranium Project, has returned a significant high-grade uranium intercept of: 8m @ 2,125ppm U3O8 from 84m down-hole, including: 5m @ 3,263ppm U3O8 from 84m.  The chemical assays correlate well with previously reported spectral gamma logs for hole 25GRV002, providing further evidence that radiometric disequilibrium is not likely to be an issue at the Oasis deposit.  The mineralisation in drillhole 25GRV002 is structurally-controlled, being hosted in the same chlorite-biotite schist shear zone as that identified in the first drill-hole 25GRV001.  Geological observations during drilling also identified minor outcrops of the same, radiometrically anomalous granitic gneiss and chlorite-biotite schist along an approximately north-south trend from the main mineralised area.  This provides strong indications that the mineralisation continues along strike, which will be followed up in future work programs planned for the next quarter. Greenvale Energy Limited ASX: GRV (“Greenvale” or “the Company”) is pleased to announce chemical assay results from the second drill hole from its maiden drilling program at the Oasis Uranium Project in Queensland, Australia. The chemical assays have confirmed a thick, highgrade uranium intercept, with further assays pending. Although the assays are only from the second hole drilled in the program, the results from drillhole 25GRV002 provide strong indications that high-grade uranium starts near-surface and continues down-dip. The geological host is confirmed as being the chlorite-biotite schist shear zone, confirming structural controls on the mineralisation and further validating historical interpretations of the deposit. Greenvale CEO Alex Cheeseman said: "The second set of chemical assay results further reinforces our confidence in the significant potential of the Oasis Project, with the strong correlation between the spectral gamma logging results and the high-grade chemical assays representing an excellent outcome. “With the maiden drill program now completed, we are looking forward to receiving the remaining assay results and data, which will provide vital inputs for the next stage of project development. Our immediate focus will be the development of a geological model with concurrent planning of a trenching program that will support the development of future drill targets.” Interactive Investor Hub - Engage directly with the Company through our Investor hub, you can ask questions, review comments and get direct access to the Company – follow the link greenvaleenergy.com.au/announcements Greenvale Energy Limited ABN 54000743555 Perth: Level 1, 1 Alvan St, Subiaco, 6008 W: greenvaleenergy.com E: admin@greenvaleenergy.com.au Brisbane: Suite 5-Level 12, 10 Market St, Brisbane 4000 Page | 1 Greenvale Energy Limited ASX Release Drill Program Overview Greenvale’s drill program commenced on 22 July 2025 with clearing access tracks and drill pads, with drilling commencing on 27 July 2025. A total of 12 drill-holes were completed, with the program comprising a combination of Reverse Circulation (RC) pre-collars and diamond core tails. Drilling concluded at the end of drill-hole 25GRV012 on 8 September 2025, with a total of 1,804.2 drilled metres. Over the period 14-15 August 2025, the first six drill-holes were logged using a spectral gamma probe, which provides continuous down-hole measurements of natural radioactivity and enables the estimation of equivalent uranium grades (eU₃O₈). All eU₃O₈ values will be confirmed through chemical assay. The Company plans to complete spectral gamma logging for drill-holes 25GRV007-25GRV012 in the coming weeks. A plan map of completed and pending drill-holes and cross-section reference is provided in Figure 1, with the corresponding cross-section of the first three drill holes shown in Figure 2. Full details of drill-holes completed can be seen in Appendix 1, with full exploration results provided as Appendix 2 and Appendix 3. Section line Figure 1: Drill-hole locations for Greenvale’s maiden drill program at Oasis Page | 2 Greenvale Energy Limited ASX Release Figure 2: Cross-section through drill-holes 25GRV01 and 25GRV02 (with chemical assay), 25GRV03 (spectral gamma) and historical drill-hole OMRC001 Oasis Project Overview The Oasis Uranium Project (EPM 27565) covers an area of 90km² in North Queensland, 250km west of Townsville and 50km west of the town of Greenvale, entirely within the Lynd Station pastoral lease. Page | 3 Greenvale Energy Limited ASX Release Uranium mineralisation is hosted in structurally controlled, deformed granite intrusives and high-grade metamorphics, with the main Oasis structure striking north–south and dipping 60–70° west. Historical exploration by Esso in the 1970s, followed by Glengarry and Mega Uranium in the early2000’s established the geological framework and confirmed the presence of uranium mineralisation. Beyond the Oasis deposit itself, the Company has had early-stage success in following-up regional radiometric targets, with rock chip results returning grades of up to 187.4ppm uranium 1. With the Oasis deposit showing initial similarities to an Alaskite deposit, (uranium mineralisation being concentrated in a shear zone and potentially related to intrusives), the Company is encouraged by the potential to make a world-class Alaskite-style discovery, similar to the Rossing deposit in Namibia. Figure 3: Drilling operations at Oasis Next Stage of Work The Oasis drilling program has now been completed, with a total 1,804.2 metres drilled across twelve holes. Processing of the drill core is ongoing, with the collection of detailed, systematic, geological logging, geotechnical and structural measurements. The immediate objective is to build comprehensive geological models for Oasis, which will be utilised to plan the next phase of drilling. Assay results from the completed holes will be reported as they become available. Concurrent planning for the conduct of a trench sampling across the northern and southern strike extensions of the deposit is ongoing, with work expected to commence in Q4. The results from this drilling program will directly inform future exploration efforts. 1 Refer to ASX Announcement Maiden drill program makes strong progress at Oasis Uranium Project released 27 August 2025 Page | 4 Greenvale Energy Limited ASX Release Authorised for release This announcement has been approved for release by the Board of Directors. For further information please contact Alex Cheeseman CEO E: admin@greenvaleenergy.com.au Nicholas Read Read Corporate E: nicholas@readcorporate.com.au M: +61(0)419 929 046 About Greenvale Energy Limited Greenvale is an ASX-listed exploration company with a portfolio of projects that will support a sustainable, low-carbon future. The Company has early-stage uranium exploration projects in the Northern Territory, the Oasis advanced-exploration project in Queensland and the Alpha Torbanite and Geothermal projects in Queensland. The Company believes the best way to create long-term shareholder value is by investing in exploration, to make discoveries and grow its resource-base. Forward Looking Statements This announcement may contain certain forward-looking statements and projections. Such forward looking statements/projections are estimates for discussion purposes only and should not be relied upon. Forward looking statements/projections are inherently uncertain and may therefore differ materially from results ultimately achieved. The Company does not make any representations and provides no warranties concerning the accuracy of the projections and disclaims any obligation to update or revise any forwardlooking statements/projects based on new information, future events or otherwise except to the extent required by applicable laws. While the information contained in this report has been prepared in good faith, neither the Company nor any of its directors, officers, agents, employees or advisors give any representation or warranty, express or implied, as to the fairness, accuracy, completeness or correctness of the information, opinions and conclusions contained in this announcement. Competent Persons Statement The information in this announcement that relates to exploration results is based on information compiled by Dr. Simon Beams who is a Member of AusIMM (Member #107121), and a Member of the Australian Institute of Geoscientists (Member #2689). Dr Beams is a full-time employee of Terra Search Pty Ltd and has sufficient experience which is relevant to the style of mineralisation under consideration to qualify as a Competent Person as defined in the 2012 Edition of the “Australian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Dr Beams consents to the inclusion in the announcement of the matters based on his information in the form and context in which it appears. Page | 5 Greenvale Energy Limited ASX Release Appendix 1 – Drillhole Collars Hole ID Easting MGA Z55 Northing MGA Z55 25GRV01 25GRV02 25GRV03 25GRV04 25GRV05 25GRV06 25GRV07 25GRV08 25GRV09 25GRV10 25GRV11 25GRV12 230701 230653 230593 230677 230698 230683 230688 230685 230682 230656 230540 230548 7918839 7918843 7918845 7918784 7918722 7918994 7919025 7919024 7918939 7918867 7918910 7918963 * = metres above sea level RL m.a.s.l.* 535 535 535 535 535 534 533 533 534 535 535 535 Mag Azi 091° 092° 075° 090° 090° 090° 090° 049° 102° 091° 092° 092° Inc -61 -60 -80 -60 -60 -60 -60 -61 -61 -61 -70 -70 TD Status (m) 63.7 Drilled 112 Drilled 301 Drilled 103 Drilled 106 Drilled 99.6 Drilled 120 Drilled 127 Drilled 92.7 Drilled 99.6 Drilled 310 Drilled 271 Drilled Page | 6 Greenvale Energy Limited ASX Release Appendix 2 – Hole 25GRV02 Sample Laboratory Chemical Assay Results From To U U3O8 (m) (m) (ppm) (ppm) 5420907 84 85 2755.39 3249.16 25GRV02 5420908 85 86 1281.54 1511.19 25GRV02 5420909 86 87 5876.5 6929.57 25GRV02 5420910 87 88 2785.98 3285.23 25GRV02 5420911 88 89 1135.06 1338.46 25GRV02 5420913 89 90 161.25 190.15 25GRV02 5420914 90 91 236.89 279.34 25GRV02 5420915 91 92 182.17 214.81 Hole ID Samples 25GRV02 Page | 7 Greenvale Energy Limited ASX Release Appendix 3 – JORC Code, 2012 Edition Table 1 Section 1 Sampling Techniques and Data (Criteria in this section apply to all succeeding sections.) Criteria JORC Code explanation Sampling techniques • • • • Commentary Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling. Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used. Aspects of the determination of mineralisation that are Material to the Public Report. In cases where ‘industry standard’ work has been done this would be relatively simple (eg ‘reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay’). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may warrant disclosure of detailed information. Drill samples were taken from the core section of diamond drill holes, pre-collared with Reverse Circulation percussion drilling (RC). Triple tube HQ diamond drilling was utilised, half core samples were collected on a 1m basis. Samples were photographed, half-cored, and despatched to an external lab by an external contractor. 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). 9 core holes were drilled at -60°, 2 at 70° and 1 drilled at -80° from surface using reverse circulation drilling until core point was reached. Then HQ drilling methods employed, using triple tube chrome barrel and orientation tool. Hole depths ranged from 66.33m to 309.85m. 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. Chip samples were collected at approximately 1m intervals. All chip samples were geologically logged and photographed. All drill samples were collected and stored in sample trays at Terra Search storage facility. • • Core recovery was recorded for all drill runs and documented in a Geotechnical log for each hole. The Triple Tube technology and procedure ensured core recoveries were excellent throughout the hole. Core was marked up in metre lengths and reconciled with drillers core blocks. An orientation line was drawn on the core. Core sampling was undertaken by an experienced operator who ensured that half- Page | 8 Greenvale Energy Limited ASX Release Criteria JORC Code explanation Commentary core was sawn up with one side consistently sent for analysis and the other side was consistently retained for archive purposes. The orientation line was consistently preserved. An unbiased, consistent half-core section was submitted for the entire hole, based on continuous 1m sampling. The entire half core section was crushed at the lab and then split, the representative subsample was then finely ground, and a representative unbiased sample was extracted for further analysis. Logging • • • Sub-sampling techniques and sample preparation • • • • • • 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. Chip samples were collected every metre, geologically logged and photographed. All core was collected, measured, geologically logged and photographed. Geological logging was carried out by well-trained/experienced geologist and data entered via a well-developed logging system designed to capture descriptive geology, coded geology and quantifiable geology. All logs were checked for consistency by the Principal Geologist. Data captured through Excel spread sheets and Explorer 3 Relational Data Base Management System. A geotechnical log was prepared. Logging was qualitative in nature. A detailed log was described based on visual observations. A comprehensive Core photograph catalogue was completed with full core dry, full core wet and half core wet photos taken of all cores. The entire length of all drill holes has been geologically logged. Drill holes 25GRV01, 25GRV02, 25GRV03, 25GRV04, 25GRV05 and 25GRV06 have been geophysically logged with the following suite of tools run including Density, Calliper, Verticality/Deviation, Gamma, Spectral Gamma and ATV Acoustic Scanner. The remaining drill holes will be geophysically logged at the end of the drill program. The calibration of the geophysical tools was conducted by the geophysical logging company engaged in the project at the time. 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 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. Whether sample sizes are appropriate to the grain size of the material Half-core samples were sawn up on a diamond saw on a metre basis at Terra Search facility in Townsville, QLD and submitted to Intertek Adelaide for preparation and analysis. The above techniques are of a high quality, and appropriate for the nature of mineralisation anticipated. Radiometric data is collected every metre of the RC and core holes to be checked and correlated against any lab data for U, Th, K. Similarly portable XRF (PXRF) data is collected on a 1m basis from RC bulk sample and from 3m drill cuttings (sludge samples) from the core sections. The latter sampling provides a qualitative check on U, Th, K contents on a broader 3m scale. In addition, downhole radiometric Page | 9 Greenvale Energy Limited ASX Release Criteria JORC Code explanation being sampled. Commentary probe data has been collected which is providing additional validation of the appropriateness of sample size. The standard 2kg -5kg sample is more than appropriate for the grainsize of the rocktypes and the sub-microscopic uranium minerals and sulphide grainsize. The sample sizes are considered to be appropriate to represent the style of the mineralisation, the thickness and consistency of the intersections. 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 (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (ie lack of bias) and precision have been established. Preparation of rock chip and core samples involves crushing splitting and grinding at Intertek/Genalysis lab Townsville. Higher grade uranium assays are analysed at Intertek in Adelaide. The total amount of economic metals and pathfinder elements tied up in sulphides and oxides such as U,Th,Cu, Pb, Zn, Ag, As, Mo, Bi, S is captured by the 4-acid digest method ICP finish. Mass spectrometry (MS) ensures low level detection and REE are also captured. This is regarded as a total digest method and is checked against QA-QC procedures which also employ these total techniques. Major elements which are present in silicates, such as K, Ca, Fe, Ti, Al, Mg are also digested by the 4 acid digest Total method. The techniques are entirely appropriate for a schistose, micaceous mineralised structure such as Oasis, hosted in primarily a granitic / metamorphic terrane. The economically important elements in these deposits are contained in both resistate minerals and sulphides which are almost entirely liberated by 4 acid digest, all gold is determined with a classic fire assay. Samples were assayed for gold using the 50g fire assay method. Downhole probing was completed by a spectral gamma tool which is a down-hole logging device that measures natural radiation in the rocks to help identify their mineral content. By analysing the energy spectrum of gamma rays, the tool can distinguish between key elements such as uranium, potassium and thorium, but still only provides an equivalent uranium value. This method provides a reliable way to estimate uranium content in drill holes, which should then be confirmed by chemical assays, and may give early indications of mineralisation. Radiometric disequilibrium occurs when the uranium parent isotope is gained or lost during geological processes, disrupting the balance between parent and daughter isotopes. Historical work at Oasis indicates this is not a significant issue, with good correlation reported between chemical and radiometric grades. Recent drilling results from holes 25GRV01 and 25GRV02 are providing good confirmation that this is true. Page | 10 Greenvale Energy Limited ASX Release Criteria JORC Code explanation Commentary QAQC samples are monitored on a batch‐by‐batch basis, Terra Search has well established sampling protocols including blanks (both coarse & pulped), certified reference material (CRM standards) Terra Search quality control included determinations on certified OREAS samples interspersed at regular intervals through the sample suite of the commercial laboratory batch. Standards are checked on receipt of results. Within the drill core results that have been returned to date are found to be within acceptable tolerances. Laboratory assay results for these quality control samples are within 5% of accepted values. 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. Sample intervals to be assigned a unique sample identification number prior to sample despatch. Significant intersections are verified by Terra Search Pty Ltd, independent geological consultants who geologically supervised the drilling. Validation is checked by comparing assay results with logged mineralogical intervals that are diagnostic of the mineralization e.g. chlorite schist, with quartz veins, minor sulphide and accompanied by high radiometric counts. These intervals have a close correlation historically with high U grades. Although holes have not been directly twinned, the holes drilled by GRV to date pass close enough to earlier drill holes, logged geology and radiometric anomalism is entirely consistent with previous results. Lab assay results from recent drilling are awaited. Data is collected by qualified geologists and experienced field technicians and entered into Excel spreadsheets. Data is imported into database tables from the Excel spreadsheets with validation checks set on different fields. Data is then checked thoroughly by the Principal Geologist for errors. Accuracy of drilling and rock chip data is then validated when imported into MapInfo. Location and analysis data are then collated into a single Excel spreadsheet. Data is stored on servers in The Company’s office (GRV) and also with Terra Search Consultants. There are regular backups and archival copies of the database made. Data is validated by long-standing procedures within Excel Spreadsheets and Explorer 3 data base and spatially validated within MapInfo GIS. No adjustments are made to the Commercial lab assay data. Data is imported into the database in its original raw format. Page | 11 Greenvale Energy Limited ASX Release Criteria JORC Code explanation Location of data points • • • Data spacing and distribution • • • Commentary 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. Drill collar has been determined using DGPS with location reported in MGA Zone 55. Expected location accuracy of +/- 0.5m Data spacing for reporting of Exploration Results. Whether the data spacing and distribution is sufficient 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. At the Oasis prospect, previous drilling program drill spacing between section lines is tight in the order of 25m or so spaced diamond core, RC percussion, and open hole percussion holes. Holes have been drilled in fences along section lines with collars generally 50m or less apart. Variously positioned over an area of 200m x 200m. Down hole sample spacing is in the order of 1m which is appropriate for the style of the deposit and sampling procedures. Down hole surveys were conducted on all holes using a Reflex Gyro. Surveys were generally taken every 30m downhole, dip, magnetic azimuth were recorded No sample compositing has been applied. All GRV sampling is of 1m downhole samples of half core. 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 mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material. Geological control of the Oasis structure containing uranium mineralisation is very well established from previous historical work dating back to the 1970’s with Esso, followed up in 2008 with modern exploration by Glengarry and Mega Uranium. The uraniferous Oasis structure is broadly north – south striking and dipping 60 to 70 degrees to the west. This structural attitude has been confirmed by 2025 Greenvale drilling. The orientation of the 2025 drilling is entirely appropriate for this structure, and the recent holes are intersecting the mineralisation at predicted intervals and at right angles to strike. True thickness of the structure will be determined when all the appropriate geochemical and geological, structural data is assembled. No sampling bias has been introduced by the drilling direction. Sample security • The measures taken to ensure sample security. Chain of custody was managed by Terra Search Pty Ltd. Core trays were freighted in sealed & strapped pallets from site where they were dispatched by Terra Search. The core was processed and sawn in Terra Search’s Townsville facilities and halfcore samples were delivered by Terra Search to Intertek/Genalysis laboratory Townsville lab. Audits or reviews • The results of any audits or reviews of sampling techniques and data. No audits have been conducted. • Page | 12 Greenvale Energy Limited ASX Release Section 2 Reporting of Exploration Results (Criteria listed in the preceding section also apply to this section.) Criteria JORC Code explanation Mineral tenement and land tenure status • • Exploration done by other parties • Commentary Type, reference name/number, location and ownership including agreements or material issues with third parties such as joint ventures, partnerships, overriding royalties, native title interests, historical sites, wilderness or national park and environmental settings. The security of the tenure held at the time of reporting along with any known impediments to obtaining a licence to operate in the area. EPM27565 was granted to Remlain Pty Ltd in Feb 2021. In Jan 2025, the mineral permit was acquired by Greenvale Utilities which is a 100% subsidiary of Greenvale Energy Ltd. The current 5-year term expires on 23rd Feb 2027. Acknowledgment and appraisal of exploration by other parties. Previous exploration summary reported in ASX releases dated 13th January 2025. Historical exploration summary reported in ASX releases dated 13th Jan 2025: The Oasis deposit and associated regional uranium anomalism are contained within EPM 27565 which covers 53 subblocks over an area of 90 km2 and located 250 km west of Townsville and 50 km west of Greenvale in FNQ. The project area is located entirely within the Lynd Station pastoral land. Previous exploration at Oasis has been conducted by multiple companies: notably Anglo American 1973-1974; Esso 1977-1979; Glengarry 2005-2006; Mega Georgetown 2007-2010; Maverick Exploration 2021-2024. Major activities include Airborne radiometrics, aero-magnetics, geological prospecting, geological mapping, trenching, soil sampling, auger drilling, track etch surveying, ground magnetics, ground radiometric surveying, diamond core , open hole percussion and reverse circulation drilling. Any previous exploration results for work completed by Greenvale is available on the Company website. Geology • Deposit type, geological setting and style of mineralisation. Structurally controlled uranium mineralization hosted in complexly deformed granite dominated intrusives and high grade metamorphics Drill hole Information • A summary of all information material to the understanding of the exploration results including a tabulation of the following information for all Material drill holes: o easting and northing of the drill hole collar o elevation or RL (Reduced Level – elevation above sea level in metres) of the drill hole collar o dip and azimuth of the hole o down hole length and interception depth o hole length. Provided in the body of this report as Appendix 1. Page | 13 Greenvale Energy Limited ASX Release Criteria Data aggregation methods JORC Code explanation • If the exclusion of this information is justified on the basis that the information is not Material and this exclusion does not detract from the understanding of the report, the Competent Person should clearly explain why this is the case. • In reporting Exploration Results, weighting averaging techniques, maximum and/or minimum grade truncations (eg cutting of high grades) and cut-off grades are usually Material and should be stated. Where aggregate intercepts incorporate short lengths of high grade results and longer lengths of low grade results, the procedure used for such aggregation should b