Announcement PDF ASX Announcement 5 December 2025 ASX: OD6 1 Down Hole EM Survey Commences at Gulf Creek Copper Project OD6 Metals Limited (OD6 or the Company) is pleased to advise that Downhole Electromagnetic (DHEM) surveying will commence over the weekend at the Gulf Creek Copper Project in NSW. The program will utilise four recently completeddiamonddrill holes (DDH) together with several reverse circulation (RC) holes completed earlier in the year, to identify conductive anomalies that may represent extensions or repetitions of high-grade copper mineralisation. Highlights • DHEM surveying willcommenceovertheweekend at theGulfCreekCopperProject,marking a key step in advancing the assessment of potential VMS copper mineralisation. • The program uses four recent diamond drill holes and earlier RC holes to identify conductive anomalies that may represent extensions of known mineralised zones. • The survey was designed by Mitre Geophysics and is being carried out by Gap Geophysics Australia, with final processed results expected early in the New Year. • Phase 2 drilling has completed four diamond holes targeting major geophysical anomalies at Big Bend, Northwest, West Limb and below the historic Gulf Creek Mine. • Drilling will be temporarily paused to allow DHEM acquisition and interpretation, ensuring the next stage of drilling is efficient and well-targeted. • Subject to results, the Company expects to resume exploration in 2026 using faster, cost- effective RC drilling. • Drilling to date has intersected typical VMS stratigraphy, including sea-floor sediments, exhalative cherts and hydrothermal alteration, confirming a prospective geological setting. • Diamond core sample selections are being finalised for laboratory analysis. • OD6 holds approvals for up to 25 drill holes totalling approximately 7,500 metres. Managing Director Brett Hazelden, commented: “The commencement of DHEM surveying marks the next important step in unlocking the copper potential at Gulf Creek. This technique has a strong track record of identifying high-grade sulphide bodies that drilling alone may miss. With multiple holes now completed across several target zones, we are well positioned for the DHEM survey to guide our next phase of drilling in 2026. We are pleased to have drilled the previously untested Big Bend, West Limb and Northwest targets, all of which confirmed the presence of VMS-style stratigraphy. This provides strong encouragement for ongoing exploration targeting. Gulf Creek continues to complement our flagship Splinter Rock Rare Earth Project by providing OD6 with exposure to a high-grade copper asset in a proven district at a time when copper prices are at record highs.” 2 What is DHEM? Downhole Electromagnetics (DHEM) is a geophysical method where an electromagnetic field is transmitted from a surface loop and measured by a probe lowered down a drill hole. Because copper sulphides (chalcopyrite, bornite, chalcocite) are significantly more conductive than surrounding host rocks, the DHEM tool can detect: • Off-hole conductors, potentially massive sulphide bodies, not intersected by drilling • Down-dip, up-dip or along-strike extensions of mineralised lodes • Potential stacked or parallel lenses hidden from surface geophysics • Depth and orientation of conductive bodies to improve drilling accuracy DHEM is considered one of the most effective tools for vectoring toward massive sulphide accumulations, particularly in structurally complex or historically mined VMS systems such as Gulf Creek. Downhole Electromagnetic (DHEM) Surveying Program Overview A total of 7–9 drill holes are planned for DHEM acquisition, each surveyed from surface to end-of-hole depth. Survey loops of approximately 200 m × 200 m dimension will be laid out across the Gulf Creek lode, Big Bend, West Limb and Northwest targets, consistent with the survey design prepared by Mitre Geophysics Recently completed OD6 drill holes being surveyed include: • GCDD007 – Big Bend target • GCDD008 – Northwest magnetic/gravity target • GCDD009 – West Limb target • GCDD010 – Gulf Creek deep hole below workings These will be supplemented by selected earlier RC holes such as GCC0001–GCC0005 where mineralisation has been logged (e.g., 1 m @ 4.33% Cu from 67 m in GCC0001; 5 m @ 2.13% Cu, 1.82% Zn from 108 m in GCC0004) The aim of surveying a combination of new and existing holes is to build a coherent geophysical picture of sulphide-hosted copper mineralisation across the Gulf Creek structural corridor. The survey has been designed to detect conductive sources located up to 100 m of each drill hole, enabling rapid follow-up drill targeting in 2026. The loops have been oriented to specifically target the steeply dipping, NW–SE striking sulphide structures interpreted from drilling and historical mine workings, as described in the survey design documentation. Any strong, coherent off-hole conductors identified will be ranked and prioritised as drill targets for the Company’s next exploration campaign at Gulf Creek. 3 Figure 1: Plan overview of the 7 holes planned to have DHEM Phase 2 Drilling at Gulf Creek Phase 2 drilling is testing potential extensions to mineralisation near the historic Gulf Creek Copper mining area. All holes were designed as such to benefit for downhole electromagnetics to model off-hole massive sulphide conductors. The current Phase 2 drill program at Gulf Creek has completed four diamond core holes to date testing large geophysical anomalies at Big Bend, North West and West Limb along with a further deep hole below the historic Gulf Creek Mine (refer to (refer to Figure 2, 3 and Table 1). These targets are considered ‘blind’ in the sense that there is no mineralization observed at surface. The three targets are magnetic anomalies modelled at between 100 to 600m beneath the surface and were targeted on the basis of the known relationship between magnetite and massive sulphides at Gulf Creek and were each drilled to 240.5m depth. The fourth hole, drilled to 328m depth, was designed in order to give full coverage, beneath the historic workings, for the upcoming down-hole electromagnetic survey. Drilling Progress has been slower than expected mainly due to rainfall, lightning and ground conditions. As such the program will be paused whilst the DHEM is conducted and the results reviewed. The Company will also look to revert to the faster and more cost effective RC drilling method once follow up targets are confirmed from the DHEM surveys. 4 All holes completed to date have confirmed: • Interbedded sedimentary and exhalative chert horizons • Hydrothermal alteration consistent with VMS systems • Minor sulphides and hydrothermal magnetite • Strong alignment with the known Besshi-style VMS model The exhalative chert is a key indicator of volcanogenic massive sulphide (VMS) systems. Although only minor sulphide mineralisation was intersected in Phase 2 drilling, DHEM is considered the most appropriate next step to identify potential off-hole massive sulphide bodies. Current DDH core samples are being reviewed, prior to dispatch for laboratory analysis.. OD6 holds approvals to complete a total of 25 drill holes for approximately 7,500 metres. Table 1. Drill Hole Details. All coordinates in GDA94 Zone 56. Hole ID Easting Northing RL Azimuth Dip Depth Target GCDD007 276791 6657547 798 228 -76 240.5 Big Bend GCDD008 276400 6658126 789 223 -60 240.5 Northwest GCDD009 276160 6657703 813 116 -55 240.5 West Limb GCDD010 277040 6657455 759 230 -67 328 Gulf Creek Figure2: Plan view o fOD6 Drilling completed to date overlain on 1st vertical derivative of magnetics with \ the priority targets Big Bend, North West, West Limb and the historic Gulf Creek Mine 5 Figure3: Long Section view to SW showing extended view of geophysical magnetic modelling and the targets along the West Limb of the Gulf Creek Synclineto the NW anomaly.Referto announcementdated 14November2024fordetails on geophysical modelling. 6 Competent Persons Statement Information in this report relating to Exploration Results is based on information reviewed by Dr Darren Holden who is a Fellow of the Australasian Institute of Mining and Metallurgy. Dr Holden is an employee of GeoSpy Pty Ltd and is geological advisor to the Company and 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 by the 2012 Edition of the Australasian Code for reporting of Exploration Results, Mineral Resources and Ore Reserves. Dr Holden owns shares in the Company and participates in the Company’s employee securities incentive plan. Dr Holden consents to the inclusion of the data in the form and context in which it appears. Forward Looking Statements Certain information in this document refers to the intentions of OD6 Metals, however these are not intended to be forecasts, forward looking statements, or statements about the future matters for the purposes of the Corporations Act or any other applicable law. Statements regarding plans with respect to OD6 Metals projects are forward looking statements and can generally be identified by the use of words such as ‘project’, ‘foresee’, ‘plan’, ‘expect’, ‘aim’, ‘intend’, ‘anticipate’, ‘believe’, ‘estimate’, ‘may’, ‘should’, ‘will’ or similar expressions. There can be no assurance that the OD6 Metals plans for its projects will proceed as expected and there can be no assurance of future events which are subject to risk, uncertainties and other actions that may cause OD6 Metals actual results, performance, or achievements to differ from those referred to in this document. While the information contained in this document has been prepared in good faith, there can be given no assurance or guarantee that the occurrence of these events referred to in the document will occur as contemplated. Accordingly, to the maximum extent permitted by law, OD6 Metals and any of its affiliates and their directors, officers, employees, agents and advisors disclaim any liability whether direct or indirect, express or limited, contractual, tortuous, statutory or otherwise, in respect of, the accuracy, reliability or completeness of the information in this document, or likelihood of fulfilment of any forward-looking statement or any event or results expressed or implied in any forward-looking statement; and do not make any representation or warranty, express or implied, as to the accuracy, reliability or completeness of the information in this document, or likelihood of fulfilment of any forward-looking statement or any event or results expressed or implied in any forward-looking statement; and disclaim all responsibility and liability for these forward-looking statements (including, without limitation, liability for negligence). No new information Except where explicitly stated, this announcement contains references to prior exploration results, all of which have been cross-referenced to previous market announcements made by the Company. The Company confirms that it is not aware of any new information or data that materially affects the information included in the relevant market announcements. The information in this report relating to the Mineral Resource estimate for the Splinter Rock Project is extracted from the Company’s ASX announcements dated 18 July 2024. OD6 confirms that it is not aware of any new information or data that materially affects the information included in the original announcement and that all material assumptions and technical parameters underpinning the Mineral Resource estimate continue to apply. This announcement has been authorised for release by the Board of OD6 Metals Limited 7 About OD6 Metals OD6 Metals is an Australian public company pursuing exploration and development opportunities within the critical minerals sector, namely rare earths and copper. Rare Earth Elements OD6 Metals has successfully identified clay hosted rare earths at its 100% owned Splinter Rock Project which is located in the Esperance-Goldfields region of Western Australia. The Company released a Mineral Resource Estimate (MRE) for Splinter Rock in May 2024, confirming that the project hosts one of the largest and highest-grade clay-hosted rare earths deposits in Australia with an Indicated Resource of 119Mt @ 1,632ppm TREO and an Inferred Resource of 563Mt @ 1,275ppm TREO with an overall ratio of ~23% high-value Magnetic Rare Earths (MagREE). An innovative Process Flow sheet has been selected utilising Heap Leaching, Nano-filtration and Ion Exchange Technologies that have achieved ~75% Nd & Pr overall recovery, produced a high-quality Mixed Rare Earth Carbonate or Hydroxide (MREC/H) of ~56-59% TREO, with low levels of impurities (Al, Fe, P, Si) and extremely low uranium and thorium content (<0.001% U + Th). OD6 Metals believes that Splinter Rock has all the hallmarks of a world class rare earths project with a conceptual heap leac h development which utilises the large and high-grade Splinter Rock resource to support a long-life REE operation. Copper The Company is advancing the Gulf Creek Copper-Zinc VMS Project located near the town of Barraba in NSW. Gulf Creek was mined at around the turn of the 20th century and was once regarded as the highest-grade copper mine (2% to 6.5% Cu) in NSW until its closure due to weak copper prices in 1912. Very little exploration has occurred at the project in over 100 years, with OD6 aiming to apply modern day exploration technologies. The 2025 maiden drilling program successfully defined high grade copper below the historical mine plus confirmed the strong relationship between magnetism and massive sulphide mineralisation. Geophysical modelling has identified multiple, high priority and untested targets ready for drilling providing over >3km of untested strike in the immediate mine- stratigraphy, and over >10km across the tenement. Corporate Directory Managing Director Non-Executive Chairman Non-Executive Director Financial Controller/ Joint Company Secretary Joint Company Secretary Contact OD6 Metals Ltd ACN 654 839 602 www.od6metals.com.au Mail to: info@od6metals.com.au Phone: +61 8 6189 8515 Level 1, 1 Alvan Street, Subiaco, WA 6008 Mr Brett Hazelden Mr Piers Lewis Dr Mitch Loan Mr Troy Cavanagh Mr Joel Ives Investor Relations Lucas Robinson Corporate Storytime lucas@corporatestorytime.com Phone: +61 408 228 889 8 JORC 2012 – Table1: Gulf Creek Section 1 Sampling Techniques and Data (Criteria listed in the preceding section also apply to this section) Criteria JORC Code explanation Commentary Sampling techniques • Nature and quality ofsampling (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 shouldnotbe takenas limitingthe broad meaning of sampling. • Include reference to measures taken to ensure sample representivity and the appropriate calibrationofany measurement tools or systems used. • Aspects ofthe determination ofmineralisation that are Material to the Public Report. • In cases where ‘industrystandard’ work has been done this would be relatively simple (eg ‘reverse circulationdrilling was used to obtain 1 m samples from which 3 kgwas pulverised toproduce a 30 g charge for fire assay’). In other cases more explanationmay 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 • No sampling reported in this release. • All drilling, as yet un-cutandassayed, is diamond core drilling, andit is anticipatedthat selected samples will be cut-half core and assayed. 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- samplingbitor other type, whether core is oriented and if so, by what method, etc). • Diamond core drilling NQ. Drill sample recovery • Method ofrecordingand 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 andwhether sample bias may have occurred due to preferential loss/gain of fine/coarse material. • Some zones ofbroken core andpotential core loss were noted, however, overall core recovery expected at >95% Logging • Whether core and chip samples have been geologically andgeotechnically logged toa 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 core logged onsite by contractgeologists recording lithology, alteration, structure and magnetic susceptibility. Sub-sampling techniques and sample preparation • Ifcore, whether cut or sawn and whether quarter, half or all core taken. • Ifnon-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 being sampled. • No samplingor sub-samplingreported in this release. 9 Criteria JORC Code explanation Commentary 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 geophysicaltools,spectrometers,handheldXRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc. • Nature ofqualitycontrol procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels ofaccuracy (ie lack of bias) and precision have been established. • No new assay results reportedin this release. Refer to assays reported previously on 7 May 2025. 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 new assay results reported in this release. Location of data points • Accuracy and quality ofsurveys used to locate drill holes (collar and down-hole surveys), trenches, mine workings and other locations used inMineral Resource estimation. • Specification of the grid system used. • Quality and adequacy of topographic control. • All drill collars sighted using hand held GPS with accuracy of +- 5m. • Downhole surveys conducted usingOmni Gyro tool by the drill team. • Results presented in GDA94 Zone 56. Data spacing and distribution • Data spacing forreportingofExploration Results. • Whether the data spacing and distribution is sufficient to establish the degree ofgeological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied. • Whether sample compositing has been applied. • Drill spacing is variable. Orientation of data in relation to geological structure • Whether the orientation of sampling achieves unbiased samplingofpossible structures and the extent to which this is known, considering the deposit type. • Ifthe relationshipbetween the drilling orientation and the orientation ofkey mineralised structures is considered tohave introduced asamplingbias, this should be assessed and reported if material. • Structural logging and compilation is on-going and orientationto stratigraphy is not established at this time. Sample security • The measures taken to ensure sample security. • All core is securely stored on site and is being reviewed Audits or reviews • The results of any audits or reviews of sampling techniques and data. • Collection of geological data from drilling has been reviewed and overseenby Core Geoscience PtyLtd and GeoSpy Pty Ltd. Section 2 Reporting of Exploration Results (Criteria listed in the preceding section also apply to this section) Criteria JORC Code explanation Commentary Mineral tenement and land tenure status • Type, reference name/number, location and ownership including agreements or materialissues 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 reportingalongwith any known impediments to obtaining a licence to operate in the area. • The GulfCreek Project EL8492 is listed on the Mining Titles Registrar ofNSWunder the GulfCreek Copper Pty Ltd, a wholly owned subsidiary of OD6 Metals.. • GulfCreek Copper Pty Ltd the sole 100% holder of the exploration license. The license was renewed on 18/03/2024 is valid until 21/12/2029. • Other than state royalties, there is no overriding royalties on the project. • The license overlaps both crown land (being the area principally ofthe historicmine) and private farmland. Private land holders in the area have previously consented to explorationactivityon theirland,and the Company knows noreason why on-going land access 10 Criteria JORC Code explanation Commentary cannot be granted. • The land falls in the area of claimants – the Gomeroi people. On private land, the native title has been extinguished. The area ofCrownland was subject to a ruling 31/03/2022 and that Native Title is effectively extinguished for the purposes of exploration. Further consents may be required prior to mining. • Heritage – areas subject to future ground disturbing work are subject to the NSW Mineral Industry Due Diligence Code of Practice for the Protection of Aboriginal Objects 2010. • Historical archaeological sites are protected under the NSW Heritage Act (1977), which may be applicable to historic buildings and structures, including the presence of historic mine and smelter workings. • Refer to ASX announcement 21March 2025 regarding NSW Resources Regulator Notice Explorationdone by other parties • Acknowledgmentandappraisal of exploration by other parties. • The GulfCreek mine has been subject to intermittent explorationfor more than 100 years. In recent times, reconnaissance andgeophysical surveys were carried out. Refer to ASX announcement 30October 2024 for details. Geology • Deposit type, geological setting and style of mineralisation. • Base metal (copperandzinc) mineralisation occurs is massive to semi-massive sulphides principally chalcopyrite and sphalerite. The mineralisation is closely associated with magnetite. • Mineralisation is hosted in a series of cherts, (sedimentary radiolarian and exhalative) siltstones and basalts ofthe Bob’s Creek Formation. The Bob’s Creek formationis underlain bythe WoodsreefFormation-an ophiolite sequence including harzburgite, dunite and gabbro. • Mineralisation is considered to be ‘Besshi Style’ Volcanogenic Massive Sulphide (VMS) deposit • The sedimentary sequence,ofwhichthe mineralisation is parallel, has been folded into NW-SE striking and steeply dipping folds. • At the historicGulfCreek mine, mineralisation strikes NW-SE and is steeply dipping(70-85degrees) to the NE. Drill hole Information • A summary of all information material to the understanding ofthe explorationresults 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. • Ifthe exclusion of this information is justified on the basis that the informationis not Material and this exclusion does not detract from the understanding ofthe report, the CompetentPerson should clearly explain why this is the case. • All drill results are reported tothe ASX in line with ASIC requirements. • A summary ofmaterialdrillhole information is included in the Drill Hole Data table included in this release. • No material has been excluded. Data aggregation methods • In reporting Exploration Results, weighting averagingtechniques, maximumand/or minimum grade truncations (eg cuttingof high grades) and cut-offgrades are usually Material and should be stated. • Where aggregate intercepts incorporate short lengths ofhighgrade results and longer lengths of low grade results, the procedure used for such aggregation should be stated and some typical examples ofsuch aggregations should be shownin detail. • The assumptions used for any reporting of metal equivalent values should be clearly stated. • No data aggregation reported in this release. 11 Criteria JORC Code explanation Commentary Relationship between mineralisationwidths and intercept lengths • These relationships are particularly important in the reporting of Exploration Results. • Ifthe geometry ofthe mineralisation with respect to the drill hole angle is known, its nature should be reported. • Ifit is not known and only the down hole lengths are reported, there shouldbe a clear statement to this effect (eg ‘down hole length, true width not known’). • No intercept or mineralization widths reported. Diagrams • Appropriate maps and sections (with scales) and tabulations ofintercepts should be includedfor any significant discoverybeing reported. These should include, but notbe limited to a plan view of drill hole collar locations and appropriate sectional views. • Diagrams are included at relevant sections in this Report Balanced reporting • Where comprehensive reportingofallExploration Results is not practicable, representative reporting ofboth low andhighgrades and/orwidths should be practiced to avoid misleading reporting of Exploration Results. • This is an update with no assay results reported. Other substantive exploration data • Other explorationdata, ifmeaningfulandmaterial, should be reportedincluding (but not limited to): geological observations; geophysical survey results; geochemicalsurvey results; bulk samples – size and method oftreatment; metallurgical test results; bulk density, groundwater, geotechnical and rock characteristics; potential deleterious or contaminating substances. • Refer to previous releases of the first drill program reported 7 May 2025 and earlier releases. • All material data available is reported. • No metallurgical testing, bulk density, or rock characteristics have been undertaken Further work • The nature and scale ofplanned further work (eg tests for lateral extensions or depth extensions or large-scale step-out drilling). • Diagrams clearlyhighlighting the areas ofpossible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive. • Mineralisation minedhistoricallyis openalongstrike to the NW and down-dip / plunge. • The Company intends to conduct down hole geophysical surveys to test the mainhistoric workings and further targets in the area. • Further work will include mineralogy, metallurgical testwork and study work subject to satisfactory drill results.