Announcement PDF ASX ANNOUNCEMENT 19 January 2026 DECEMBER QUARTERLY ACTIVITIES REPORT Delta Lithium Limited (ASX: DLI) (“Delta” or “the Company”) is pleased to provide a summary of activities undertaken during the quarter ended 31 December 2025. December Quarter Highlights • Mt Ida Lithium updated Mineral Resource Estimate (MRE): 14.8 Mt @ 1.21% Li2O, 170 ppm Ta2O5 and 0.42% Rb2O1 • Measured classification 0.5Mt de-risking early mining potential • 7.7Mt in Measured & Indicated classification at grades of 1.33% Li2O, 212 ppm Ta2O5 and 0.45% Rb2O • One of the world’s highest-grade publicly released Rubidium Oxide (Rb2O) MRE1 • Lithium Whole of Ore Flotation (WOF) flowsheet extracts rubidium in the mica pre-float stage with recoveries averaging ~90% • Rubidium product has the potential to improve the Mt Ida Lithium Project economics and add an additional revenue stream • Rubidium applications are growing globally with placement on the critical minerals lists, including the United States and Japan • Downstream processing and vertical integration studies are well underway with positive initial results • The Mt Ida Project is fully permitted for both Open Pit & Underground Mining • Drilling campaign underway at Yinnetharra as Ballard Mining’s ongoing gold drilling at Mt Ida provides Delta with additional data, further de-risking works and increasing resource confidence • Delta’s cash balance was $54M with listed investments circa $108M2 (as at 31 December 2025) Commenting on the quarter, Managing Director of Delta Lithium, Mr James Croser said: “The most recent quarter was another important and beneficial period for Delta. The demerger and subsequent IPO of our gold assets into Ballard Mining earlier in the year not only resulted in a significant benefit to Delta’s balance sheet, now at more than $100 million, marked to market, but provides ongoing benefits from additional pegmatite intercepts via Ballard’s current ongoing gold drilling program with multiple rigs on site. Delta continues to advance and de-risk the Mt Ida Lithium Project at very low cost on the back of the gold drilling by Ballard Mining. Coupled with our existing cash balance of $54 million, Delta remains well positioned to pursue growth from our lithium portfolio and options further afield. “Delineation of a high-grade maiden rubidium resource accompanying the lithium and tantalum presents as a worthy target for value-add and co-product revenue generation with little change to the current proposed process flowsheet. 1 Refer ASX Announcement released on 13 Nov 2025 entitled ‘Mt Ida Lithium and Rubidium MRE’ 2 Shares in listed investments include 156M BM1 (subject to escrow), 5M MEX (formerly UVA) and 16.9M (post consolidation) JAV 1 ASX ANNOUNCEMENT 19 January 2026 “Drilling continues at Yinnetharra with an RC rig on priority targets along the 20km of Leake Springs unit linking our two MRE’s at Jameson to Malinda, testing extensions to Jameson’ mineralisation and seeking more Lithium on our recently acquired ground.” Figure 2: Location of Delta’s Projects Mt Ida Project Mt Ida is located approximately 240km north of Kalgoorlie in Western Australia. The Project area resides on granted mining leases and is fully permitted for commencement of open pit and underground mining at the main Sister Sam, Timoni and Sparrow resources. The Project is now benefitting from incrementally free exploration via gold drilling activities being completed by Ballard Mining (ASX:BM1) along the 26km margin of the Copperfield Granite intrusion. All BM1 drilling that intersects favourable lithology will be submitted for assaying by Delta, which holds all mineral rights except gold at Mt Ida. Currently the drilling by Ballard in the vicinity of the Sister Sam and Timoni orebodies is resulting in an increased drill density, and thus improved lithium, tantalum and rubidium resource confidence and classification. 2 ASX ANNOUNCEMENT 19 January 2026 Figure 1: Plan view to Mt Ida Project location with global resources Mt Ida Mineral Resource Update During the December quarter, Delta updated the independent Lithium Mineral Resource Estimate (MRE) which was prepared by Snowden Optiro on the Sister Sam, Timoni and Sparrow pegmatites at the Company’s wholly owned Mt Ida Lithium Project in the Eastern Goldfields Region of Western Australia – see Table 1. The MRE update has been reported under the Reasonable Prospectus for Eventual Economic Extraction (RPEEE) criteria. This only includes material that falls within Open Pit shells & Mineable Shape Optimizer’s (MSO’s) – refer to ASX announcement dated 13 November 2025 ‘Mt Ida Lithium and Rubidium MRE’ for full details of the economic parameters used. The MRE update was as a result of previous drilling conducted by Delta and current gold infill drilling by Ballard Mining, which has resulted in the refining of wireframes, reducing volumes in certain areas and extending mineralisation in others but ultimately leading to an increase in overall confidence and tonnes. The incorporation of this additional drilling when combined with advanced metallurgy, environmental and geotechnical works has allowed for the delineation of a portion of Measured resources – see Figure 2. This is a great benefit to the Project and speaks to the confidence of the shallow material which would be the initial focus in a mining scenario. 3 ASX ANNOUNCEMENT 19 January 2026 Figure 2: View facing Southeast showing Mt Ida Lithium Resource Classification & unconstrained Rubidium oxide block model The primary aim of the update to the MRE was to determine the spatial distribution of contained rubidium, which occurs entirely within the existing lithium wireframes, while updating the classification based upon the metallurgical and geotechnical feasibility work that has been completed to date. This resulting MRE highlights Mt Ida as a globally significant potential source of rubidium material as well as the world’s current highest-grade resource according to public data – see Figure 3. Figure 3: Bubble chart illustrating Mt Ida’s Rb Mineral Resource compared with publicly released global Rb Mineral Resources (Inferred, Indicated and Measured reported according to JORC (2012) and NI-43 101). Refer Appendix 3. 4 ASX ANNOUNCEMENT 19 January 2026 Mt Ida Lithium, Tantalum & Rubidium Resource November 2025 Li2O Ta2O5 Rb2O Area Resource category Cut-off grade (Li2O%) Tonnes (t) Grade (Li2O%) Tonnes (Li2O) Grade (Ta2O5 ppm) Grade (Rb2O%) Sparrow OP Measured 0.3 - - - - - Indicated 170,000 0.95 1,600 287 0.42 Inferred - - - - - Total Resource 170,000 0.95 1,600 287 0.42 UG Measured 0.5 - - - - - Indicated 1,100,000 1.05 11,000 176 0.43 Inferred 1,100,000 0.93 10,000 141 0.40 Total Resource 2,200,000 0.99 21,000 159 0.42 All Measured - - - - - Indicated 1,300,000 1.03 13,000 191 0.43 Inferred 1,100,000 0.93 10,000 141 0.40 Total Resource 2,400,000 0.99 31,000 168 0.42 Sister Sam OP Measured 0.3 270,000 1.30 3,500 268 0.44 Indicated 3,200,000 1.45 46,000 257 0.48 Inferred 82,000 1.07 880 176 0.39 Total Resource 3,500,000 1.43 51,000 256 0.47 UG Measured 0.5 - - - - - Indicated 2,000,000 1.38 27,000 166 0.45 Inferred 4,900,000 1.12 55,000 119 0.38 Total Resource 6,900,000 1.19 82,000 133 0.40 All Measured 270,000 1.30 3,500 268 0.44 Indicated 5,200,000 1.42 73,000 222 0.47 Inferred 5,000,000 1.12 55,000 120 0.38 Total Resource 10,400,000 1.27 130,000 175 0.42 Timoni OP Measured 0.3 220,000 1.09 2,400 240 0.33 Indicated 290,000 1.18 3,400 216 0.41 Inferred 27,000 0.75 210 185 0.25 Total Resource 540,000 1.12 6,000 224 0.37 UG Measured 0.5 - - - - - Indicated 470,000 1.35 6,400 191 0.33 Inferred 1,000,000 0.99 10,000 137 0.38 Total Resource 1,500,000 1.11 16,000 154 0.37 All Measured 220,000 1.09 2,400 240 0.33 Indicated 760,000 1.29 9,900 200 0.36 Inferred 1,000,000 0.98 10,000 138 0.38 Total Resource 2,000,000 1.11 22,000 173 0.37 Total Measured 490,000 1.20 5,900 256 0.39 Total Indicated 7,200,000 1.34 96,000 215 0.45 Total Inferred 7,100,000 1.07 76,000 126 0.38 Total 14,800,000 1.21 177,000 170 0.42 Table 1: Mt Ida updated MRE table Tonnages and grades have been rounded to reflect the relative uncertainty of the estimate. Inconsistencies in the totals are due to rounding) 5 ASX ANNOUNCEMENT 19 January 2026 Metallurgical Studies Extensive metallurgical testwork has been completed on the Mt Ida Lithium Project to date. Feasibility testwork has confirmed that the Mt Ida deposit can produce tantalite, mica & spodumene concentrates via a process flowsheet including spirals and whole ‘ore’ flotation (WOF). Figure 4 illustrates the Mt Ida flowsheet and staged separation of spodumene, mica and tantalite concentrates. Figure 4: Block Flow diagram showing Mt Ida Lithium process flowsheet with average Li & Rb concentrate grades based on testwork to date Existing WOF flowsheet testwork confirmed that rubidium is readily extracted as a byproduct within the mica pre-float stage and reports to the mica concentrate. This can be seen in Table 2 highlighting the amenability of the existing flowsheet to recover >90% of rubidium in the ore feed and up to 50-55% of the total contained Li2O during this mica pre-float process, resulting in production of a high-grade lithium/rubidium concentrate with an overall average grade of 3.01% Li2O and 1.8% Rb2O based on flotation work to date. 6 ASX ANNOUNCEMENT 19 January 2026 Table 2: Mica flotation results summary showing lithium / rubidium grades Further Testwork These results are extremely encouraging and present with significant concentrations of high value critical minerals. As a result, the Company commissioned Strategic Metallurgy to conduct Phase 1 downstream processing optimisation and economic studies to outline a pathway to potential commercial production of lithium, rubidium and potassium products from this mica concentrate. These works are underway and have already returned high recoveries from leaching stages and alum separation, thus confirming the amenability of the concentrate to produce high purity lithium carbonate (Li2CO3) and rubidium carbonate (Rb2CO3) as well as potassium sulphate as a byproduct. Phase 1 results will be released to market when completed in full and finalised. Rubidium Market The global rubidium market is a relatively small but strategically significant segment within the specialty metals sector, underpinned by its unique properties and expanding high-technology applications. Traditionally used in specialty glass, electronics and chemical research, rubidium demand is increasingly driven by the following industries; - Military and Defence Systems - Quantum Technologies - Biomedical Applications - Oil & Gas Drilling applications - Next-generation sensors (Atomic Clocks) Emerging uses in quantum navigation, medical imaging, and specialty formate fluids are broadening the market’s commercial footprint beyond its historical niche. Rubidium is a heavier alkali metal with a free outer valance electron, making it particularly valuable in quantum mechanics research where this hydrogen-like Test Sample ID Fraction Grade (%) Recovery (%) Mass Yield (%) Li2O (ppm) Li2O Fe2O3 Rb (ppm) Rb % Li2O Fe2O3 Rb #6 Sighter Comp 2 P80 0.106mm +0.02mm LIMS NM Sighter Float #6 Mica Cl Con 1-4 29.34% 25496 2.55 0.570 15342 1.53 55.15% 69.10% 90.27% #7 Sighter Comp 2 P80 0.106mm +0.02mm LIMS NM WHGMS NM Sighter Float #7 Mica Cl Con 1-4 16.25% 31013 3.10 0.356 19729 1.97 37.63% 33.38% 60.52% #8 Sighter Comp 2 P80 0.106mm +0.02mm LIMS NM WHGMS NM Sighter Float #8 Mica Cl Con 1-4 33.50% 21403 2.14 0.342 14124 1.41 52.97% 65.65% 93.32% #9 Sister Sam Comp 1 P100 3.35mm Float Feed P80 0.106mm +0.02mm LIMS NM Sighter Float #9 Mica Cl Con 1-4 33.85% 34433 3.44 0.043 19562 1.96 56.94% 51.71% 96.28% #10 Timoni Comp 1 P100 3.35mm Float Feed P80 0.106mm +0.02mm LIMS NM Sighter Float #10 Mica Cl Con 1-4 31.54% 23542 2.35 0.175 16128 1.61 56.32% 72.14% 94.04% #11 Sister Sam Comp 1 P100 3.35mm P80 0.106mm +0.02mm LIMS NM Sighter Float #11 Mica Cl Con 1-4 37.45% 26738 2.67 0.041 15072 1.51 54.76% 22.65% 96.46% #12 Timoni Comp 1 P100 3.35mm P80 0.106mm +0.02mm LIMS NM Sighter Float #12 Mica Cl Con 1-4 30.07% 19357 1.94 0.161 13425 1.34 51.15% 71.62% 92.87% #13 Timoni Sister DMS Float Feed Comp P80 0.106mm Longi500 NM CUF Sighter Float #13 Mica Cl Con 1-4 32.46% 30666 3.07 0.105 18020 1.80 57.60% 64.46% 95.66% #14 Timoni Sister DMS Float Feed Comp P80 0.106mm Longi500 NM CUF Sighter Float #14 Mica Cl Con 1-4 27.88% 32028 3.20 0.104 18333 1.83 54.29% 57.55% 94.41% #15 Timoni Sister DMS Float Feed Comp P80 0.106mm Longi500 NM CUF Sighter Float #15 Mica Cl Con 1-4 26.88% 34627 3.46 0.103 19536 1.95 55.02% 52.67% 94.83% #16 Timoni Sister DMS Float Feed Comp P80 0.106mm Longi500 NM CUF Sighter Float #16 Mica Cl Con 1-4 28.56% 32687 3.27 0.102 19977 2.00 55.29% 53.60% 95.81% #17 Timoni Sister DMS Float Feed Comp P80 0.106mm Longi500 NM CUF Sighter Float #17 Mica Ro Con 1-4 31.10% 31664 3.17 0.098 17994 1.80 54.70% 52.57% 95.89% #18 Timoni Sister DMS Float Feed Comp P80 0.106mm Longi500 NM CUF Sighter Float #18 Mica Ro Con 1-4 41.38% 25066 2.51 0.093 13883 1.39 60.72% 68.63% 96.65% 7 ASX ANNOUNCEMENT 19 January 2026 characteristic proves ideal for precision modelling in quantum mechanics and atomic physics, particularly where solutions to Schrödinger’s calculation are necessary. The scarcity of high-purity supply and rising demand from defence, aerospace and energy technology sectors point to a tightening geostrategic market and sustained upward demand trajectory through the decade which is expected to reach USD $8 billion by 20333 . Its recent designation as a critical mineral in key markets such as the United States and Japan, coupled with the global push to secure non-Chinese supply chains, positions Delta favourably in Western markets. At today’s price of approximately USD$1,0674 per kilogram for high-purity rubidium carbonate, the potential value contribution from rubidium represents a significant strategic upside for the Mt Ida Project. YINNETHARRA LITHIUM PROJECT The Yinnetharra Project, in the Gascoyne region of Western Australia, targets Lithium mineralisation, with Delta now owning more than 2,300 km² of tenure outright and as Farm-in Joint Ventures. A MRE update for Yinnetharra was released in March 2025 of 21.9 Mt @ 1% Li2O and 75ppm Ta2O5 and an additional 17.5Mt @ 136ppm Ta2O5. Lithium resources at Malinda are present in three main pegmatites: the M1, M36 and M47, with smaller resources at M42, M20, M67 and M69. Mineralisation extends from surface to a depth of greater than 300m. The recent MRE update has now classified 74% of the Resource as Indicated underpinning future studies and project development pathways – See Figure 2. The Malinda Project is well advanced with DFS-level metallurgy and geotechnical studies5 completed over the M1 pegmatite in particular, and the mining lease application has been submitted. The investigation of various mining scenarios are well advanced, while the regional tenure presents upside for additional resource tonnes. During the most recent quarter, the Company mobilised a reverse circulation (RC) rig up to the Yinnetharra Project to test up to six (6) high priority regional targets adjacent to Jameson (MRE 0.8Mt @ 1.66% Li2O) and extending south then east toward Malinda along the 20km of prospective Leake Springs metasediment unit. Drilling was paused for a two week period over Christmas before recommencing in early January to continue the program. The RC program will systematically test the high priority prospects which have been developed throughout 2025 via extensive “boots on the ground” exploration across existing and newly acquired tenure. The LCT rights agreement with Dalaroo Metals at the Lyons River Project was terminated during the quarter for no consideration. Multiple phases of exploration programs were completed over the tenure with no meaningful LCT anomalies being delineated. 3 Rubidium: The Forgotten Element Enhancing Lithium Batteries 4 SMM Shanghai Metals Market Nov 12, 2025 (Rubidium Carbonate >99% USD/kg) 5 Yinnetharra Operational & Metallurgical test work update released to the ASX 21st January 2025 8 ASX ANNOUNCEMENT 19 January 2026 Figure 5: Yinnetharra tenure showing geology and regional targets 9 ASX ANNOUNCEMENT 19 January 2026 Jameson Jameson represents a high priority target in relation to exploration and resource growth. The current Jameson MRE of 0.8Mt @ 1.66% Li2O is open down plunge and will be tested during the RC drilling program. The area is structurally complex with several deformational and folding events. Structural analysis undertaken has improved understanding of the paragenesis and subsequent mineralisation which is hosted in these structural traps. The detailed structural review identified the F2 fold hinges and later stage faults as priority targets for future exploration. The current surface data correlates with this thesis, suggesting Lithium-enriched fluids have mobilised through these potential structural trap zones – see Figure 3. The majority of this Phase 1 drilling program is targeting these fold hinges, limbs and faults which possess elevated discrete surface anomalies and represent compelling targets. These targets have never been drill tested and have an identical structural setting to the J1 pegmatite. Figure 3: Plan View to Jameson with planned drilling 10 ASX ANNOUNCEMENT 19 January 2026 Yinnetharra Regional Exploration As part of the regional campaign, exploration work has continued across the 3000km2 Project and JV tenure. The team have been conducting systematic surface exploration across prospective areas and generated over 25 prospects (Figure 4) with many areas not yet explored. This greenfields geological work comprised of detailed mapping, rock chip and auger sampling as well as a high-resolution drone magnetic survey. The magnetics survey was completed in September and flown at 25m spacings and 20m vertical height to produce a high-resolution map which will aid with structural interpretations and target generation. The culmination of these greenfields geological workstreams has resulted in six priority drill targets that will be the focus of the Phase 1 drill program, all of which are hosted in the Leake Springs Metamorphics unit, the preferential host of Jameson and Malinda deposits – see Figure 4. Figure 4: Plan View to Yinnetharra MRE’s and drill targets for current exploration programs 11 ASX ANNOUNCEMENT 19 January 2026 Mason’s Prospect is a 500m long target characterised by enriched lithium, caesium and tantalum (LCT) pegmatites located 3km along strike from Jamesons within the same host rocks. The first phase of drilling will target these northwest trending pegmatites at depth and along the defined strike. The Yamazaki Prospect is a compelling exploration target sitting just 8km from Jameson and 12km from Malinda along the margin of the continuous Leake Springs unit. It hosts a 4km long lithium surface geochemical anomaly that has never been drilled – see Figure 5. First pass drilling will focus on the primary lithium anomalies while Phase 2 and 3 drilling have been planned pending successful results. Figure 5: Plan View to the Yamazaki prospect showing surface anomalism North Talisker and Caribou are both strong targets with each hosting consistent LCT signatures and rock chips as high as 822ppm Ta2O5. North Talisker has never been drilled while only 13 holes were completed at Caribou South last year with follow up work identified at that time. The East Calypso Prospect is one of the highest ranked targets beyond Jameson. This prospect sits immediately adjacent to the Thirty-Three Suites Granite within the Leak Springs which is a mirror image of the geological setting at the Malinda deposit. Contrary to the general LCT models, the 21.1Mt @ 1% Li2O at Malinda is located only a few hundred metres away from the apparent source granite which is identical to East Calypso to the south. East Calypso is also strengthened by the same host rocks and consistently high lithium / caesium levels in the surface dataset, while caesium is generally very immobile and does not travel far from the source – see Figure 6. These E-W trending pegmatites will be tested thoroughly during this current program. 12 ASX ANNOUNCEMENT 19 January 2026 Figure 6: Plan Views to East Calypso with surface data showing lithium & caesium anomalism Figure 7: Plan Views to East Calypso with surface data showing lithium & caesium anomalism 13 ASX ANNOUNCEMENT 19 January 2026 Approvals and Project Development A Mining Lease application M09/185 has been submitted for the Malinda Mining Area (Figure 7) and Native Title negotiations are ongoing. Environmental permitting has advanced with all flora and fauna field surveys now completed, and technical reports being finalised. The approvals and permitting strategy remain on track, with the submissions to regulators planned for completion in Q2-2026. Figure 7: Plan View to submitted Mining Lease application. 14 ASX ANNOUNCEMENT 19 January 2026 Delta is advancing the water exploration program at Yinnetharra via Passive Seismic surveying, which has been completed across the target terrain and successfully mapped out the paleochannel bedrock in these locations – see Figure 8. Vertical probe holes will be completed during the upcoming drill program to confirm the location of the modelled thalweg, that being the deepest and most productive part of a paleochannel system. This confirmatory drilling will allow for the precise planning of water production bore drilling and construction to follow. The Water Development workstream serves to identify a reliable subsurface water source supporting Projects’ mining and processing requirements for feasibility, planning and approvals purposes. Water is a crucial aspect of mine feasibility and water investigations are ongoing and in parallel with current exploration activities. Figure 8: View to Passive Seismic Survey Results mapping paleochannels CORPORATE Delta’s ASX-listed investments at the end of the quarter consisted of 156M shares in BM1 (subject to escrow), 5M shares in MEX (formerly UVA) and 16.1M shares in JAV (post consolidation). Cash at the end of the quarter was $54M. 15 ASX ANNOUNCEMENT 19 January 2026 The Company held its Annual General Meeting on the 27th of November at The Celtic Club in West Perth. All resolutions were passed upon conducting a poll. The results of the poll were published on the ASX on the 27th of November. ASX COMPLIANCE ASX Listing Rule 5.3.1: Exploration and Evaluation Expenditure during the December 2025 Quarter was $3.601M. Full details of exploration activity during the December 2025 Quarter are set out in this report. ASX Listing Rule 5.3.2: There was no substantive mining production and development activities during the December 2025 Quarter. ASX Listing Rule 5.3.5: Payments to related parties of the Company and their associates during the December Quarter: $191k - The Company advises that this relates to non-executive director’s fees and executive directors’ salaries and entitlements only. Please see Remuneration Report in the Annual Report for further details on Directors’ remuneration. Release authorised by the Board of Delta Lithium Limited. For further information, please contact: Delta Lithium Investor/Media Enquiries James Croser, Managing Director Sodali & Co Peter Gilford, CFO & Company Secretary Russell Quinn +61 403 322 097 +61 8 6109 0104 info@deltalithium.com.au 16 ASX ANNOUNCEMENT 19 January 2026 About Delta Lithium Delta Lithium (ASX: DLI) is an exploration and development company focused on bringing high-quality, lithium-bearing pegmatite deposits, located in Western Australia, into production. With current global JORC compliant resources of 36.9Mt@1.0% Li2O, strong balance sheet and an experienced team driving the exploration and development workstreams, Delta Lithium is rapidly advancing its Projects. The Mt Ida Project has coincident gold and lithium orebodies and holds a critical advantage over other developers with existing Mining Leases and an approved Mining Proposal. Delta Lithium is pursuing a development pathway to unlock maximum value for shareholders. Delta has recently spun out its gold assets into Ballard mining on 14th July 2025 and retains a 41% equity stake in this company. Delta Lithium also holds the highly prospective Yinnetharra Lithium Project, with exciting lithium discoveries at the Malinda and Jamesons prospects. The Company is currently conducting exploration activities at Yinnetharra with fieldwork commenced for 2025 across our large tenure package, testing additional targets and aiming to build on the Maiden Resource at Malinda. Competent Person's Statement Information in this Announcement that relates to exploration results is based upon work undertaken by Mr. Shane Murray, a Competent Person who is a Member of the Australasian Institute of Geoscientists (AIG). Mr. Murray has sufficient experience that 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’ (JORC Code). Mr. Murray Refer to www.deltalithium.com.au for past ASX announcements. Past Exploration results and Mineral Resource Estimates reported in this announcement have been previously prepared and disclosed by Delta Lithium in accordance with JORC 2012. The Company confirms that it is not aware of any new information or data that materially affects the information included in these market announcements. The Company confirms that the form and content in which the Competent Person's findings are presented here have not been materially modified from the original market announcement, and all material assumptions and technical parameters underpinning Mineral Resource Estimates in the relevant market announcement continue to apply and have not materially changed. Refer to www.deltalithium.com.au for details on past exploration results and Mineral Resource Estimates. Disclaimer This release may include forward-looking and aspirational statements. These statements are based on Delta Lithium management’s expectations and beliefs concerning future events as of the time of the release of this announcement. Forward-looking and aspirational statements are necessarily subject to risks, uncertainties and other factors, some of which are outside the control of Delta Lithium, which could cause actual results to differ materially from such statements. Delta Lithium makes no undertaking to subsequently update or revise the forward looking or aspirational statements made in this release to reflect events or circumstances after the date of this release, except as required by applicable laws and the ASX Listing Refer to www.deltalithium.com.au for past ASX announcements. 17 ASX ANNOUNCEMENT 19 January 2026 JORC Tables Table 2: Global Lithium Mineral Resource Estimate Summary Delta Lithium Group Mineral Resource estimate (Li₂O only) Resource category Cut-off grade (Li₂O%) Li₂O Ta₂O₅ Rb2O Tonnes (Mt) Grade (% Li₂O) Li₂O (Kt) Grade (Ta₂O₅ ppm) Grade (Rb2O %) Yinnetharra Measured 0.5 - - - - Indicated 16.1 1.0 158 77 Inferred 5.8 0.9 54 69 Total Resource 21.9 1.0 212 75 Mt Ida Measured 0.3 - 0.5 0.5 1.1 5.9 256 0.39 Indicated 7.2 1.3 96 215 0.45 Inferred 7.1 1.1 83 126 0.38 Total Resource 14.8 1.2 190 173 0.42 Total Measured 0.5 1.1 5.5 256 0.39 Total Indicated 23.3 1.1 254 120 Total Inferred 12.9 1.0 137 100 Total 36.7 1.1 402 115 18 ASX ANNOUNCEMENT 19 January 2026 Table 3: Yinnetharra Tantalum Only MRE Yinnetharra Tantalum Only Resource March 2025 Area Resource category Cut-off grade (Ta2O5ppm) Tonnes (Mt) Li2O% Li2O (Kt) Ta2O5 ppm Ta2O5 (Kt) MT1 Measured 65 - - - - - Indicated 3.7 0.1 3 82 0.3 Inferred 0.6 0.0 0 94 0.1 Total Resource 4.3 0.1 4 84 0.4 MT20 Measured 65 - - - - - Indicated - - - - - Inferred 0.2 0.1 0 115 0.0 Total Resource 0.2 0.1 0 115 0.0 MT36 Measured 65 - - - - - Indicated 4.3 0.1 5 123 0.5 Inferred 0.6 0.1 1 106 0.1 Total Resource 4.9 0.1 5 121 0.6 MT42 Measured 65 - - - - - Indicated 0.3 0.2 1 175 0.1 Inferred 2.5 0.1 2 208 0.5 Total Resource 2.8 0.1 3 204 0.6 MT47 Measured 65 - - - - - Indicated 2.1 0.1 3 186 0.4 Inferred 0.5 0.1 0 257 0.1 Total Resource 2.5 0.1 3 199 0.5 MT67 Measured 65 - - - - - Indicated - - - - - Inferred 0.6 0.2 1 113 0.1 Total Resource 0.6 0.2 1 113 0.1 MT69 Measured 65 - - - - - Indicated - - - - - Inferred 1.6 0.1 2 105 0.2 Total Resource 1.6 0.1 2 105 0.2 MT70 Measured 65 - - - - - Indicated - - - - - Inferred 0.7 0.1 1 161 0.1 Total Resource 0.7 0.1 1 161 0.1 Total Measured - - - - Total Indicated 10.4 0.1 12 122 1.3 Total Inferred 7.1 0.1 7 156 1.1 Total 17.5 0.1 19 136 2.4 19 ASX ANNOUNCEMENT 19 January 2026 Appendix 1 – Tenement Listing Project Location Tenement Status Interest at start of Quarter Interest at end of Quarter Mt Ida ^ Western Australia E29/0640 Granted 100% 100% Mt Ida ^ Western Australia E29/0771 Granted 100% 100% Mt Ida ^ Western Australia E29/0944 Granted 100% 100% Mt Ida ^ Western Australia E29/0964 Granted 100% 100% Mt Ida ^ Western Australia E29/1238 Granted 100% 100% Mt Ida ^ Western Australia E29/1239 Granted 100% 100% Mt Ida ^ Western Australia E29/1240 Granted 100% 100% Mt Ida ^ Western Australia E29/1262 Application 100% 100% Mt Ida^ Western Australia E29/1288 Granted 100% 100% Mt Ida^ Western Australia E29/1292 Application 100% 100% Mt Ida^ Western Australia E29/1293 Granted 100% 100% Mt Ida^ Western Australia E29/1309 Application 100% 100% Mt Ida ^ Western Australia M29/0002 Granted 100% 100% Mt Ida ^ Western Australia M29/0094 Granted 100% 100% Mt Ida ^ Western Australia M29/0165 Granted 100% 100% Mt Ida ^ Western Australia M29/0422 Granted 100% 100% Mt Ida ^ Western Australia M29/0429 Granted 1