Announcement PDF ASX ANNOUNCEMENT 18 June 2026 Termination of Ti-Tree Earn-In Joint Venture Highlights: Yinnetharra • Termination of Ti-Tree Earn-In Joint Venture ο Delta Lithium and Voltaic Strategic Resources (ASX: VSR) have mutually agreed to terminate the Earn-In Joint Venture agreement over the Ti-Tree project. Delta Lithium Limited (ASX: DLI) (“Delta” or “the Company”) provides an update in relation to project tenement status at the Yinnetharra Lithium and Tantalum Project. The Yinnetharra Project is in the Gascoyne region of Western Australia targeting lithium mineralisation. Delta has over 2,000km2 of project tenure which is 100% owned. A mineral resource estimate (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. Delta and Voltaic Strategic Resources have mutually agreed to terminate the Earn-In Joint Venture agreement over the Ti-Tree project. The Ti-Tree Project consists of tenement E09/2503 and applications E09/2522 and E09/2935. Commenting on the transaction, Delta Lithium Managing Director, James Croser said; “Delta and Voltaic have mutually agreed to terminate the Earn-In and Joint Venture Agreement over the Ti- Tree project. We wish Voltaic every success in the future. Delta will continue its exploration efforts on the 100% owned tenure in the Yinnetharra region as we look to build upon the current Mineral Resource.” Release authorised by the Managing Director on behalf of 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 2 ASX ANNOUNCEMENT 18 June 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 36.5Mt@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 34.4% 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 continuing in 2026 across our large tenure package, testing additional targets and aiming to build on the current JORC Resources. Competent Person's Statement Information in this Announcement that relates to exploration results is based upon work undertaken by Mr. Olaf Frederickson, a Competent Person who is a Member of the Australasian Institute of Geoscientists (AIG). Mr. Frederickson 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. Frederickson is an employee of Delta Lithium Limited and consents to the inclusion in this announcement of the matters based on his information in the form and context in which it appears. 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. Refer ASX Announcements; • 31 March 2025 entitled ‘Yinnetharra Lithium and Tantalum MRE Update’ • 13 November 2025 entitled ‘Mt Ida Lithium and Rubidium MRE 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. 3 ASX ANNOUNCEMENT 18 June 2026 Appendix 1 A - Lithium MRE Group summary table 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 - Refer ASX Announcements; 31 March 2025 entitled ‘Yinnetharra Lithium and Tantalum MRE Update’ 13 November 2025 entitled ‘Mt Ida Lithium and Rubidium MRE’ 4 ASX ANNOUNCEMENT 18 June 2026 Appendix 1 B - 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