Delta Lithium Expands Yinnetharra Project Through Strategic Aston Acquisition

Delta Secures Dominant Position in Upper Gascoyne Lithium Province

Delta Lithium (ASX: DLI) has significantly strengthened its position in Western Australia's emerging Upper Gascoyne Lithium province through the strategic acquisition of Minerals 260's Aston Project. The transaction adds approximately 1,750km² of highly prospective, under-explored terrain to Delta's Yinnetharra Lithium and Tantalum Project, bringing the company's total landholding to over 3,100km².

The newly acquired ground is particularly promising as it sits just 2km along strike from the high-grade Jameson Mineral Resource Estimate (MRE) of 0.8Mt @ 1.66% Li₂O within the same host rocks. This acquisition strategically positions Delta as the dominant player in the region.

"The tenure acquired from MI6 is an excellent strategic addition to our Yinnetharra Project and a significant bolt-on to our recent Mortimer Hills acquisition just a few weeks ago. Delta has strengthened our dominant position in this highly prospective Upper Gascoyne Region." – James Croser, Managing Director

Current Resource Base Provides Solid Foundation

The Yinnetharra Project already hosts a substantial mineral resource base:

• 21.9Mt @ 1.0% Li₂O (at 0.5% Li₂O cut-off)
• 39.4Mt @ 102ppm Ta₂O₅ (at 65ppm Ta₂O₅ cut-off)

This resource update was recently completed by independent consultant Snowden Optiro and announced in March 2025.

Resource Breakdown by Deposit Area

Note: Table shows select deposits with resource estimates over 1Mt or high-grade areas

Immediate Exploration Potential

The acquisition provides access to another 10km of strike length of the Leake Springs Metamorphic unit, which hosts all lithium and tantalum resources at Yinnetharra to date. Numerous compelling targets have been identified, with Delta planning to immediately commence:

• Systematic geochemical sampling and mapping over priority areas
• Geophysical surveys
• Passive seismic surveys to target deep water paleochannels
• Hydrogeological program planning (scheduled to commence this year)

Understanding Lithium-Cesium-Tantalum (LCT) Pegmatites

LCT pegmatites represent the primary source of hard-rock lithium globally. These rare geological formations are highly evolved granite intrusions, often enriched with lithium, cesium, tantalum, tin, and other rare elements.

What makes the Yinnetharra acquisition particularly significant is its proximity to the Thirty-Three supersuite granites, which are believed to be the source of the mineralisation at both the Malinda and Jameson deposits. These granitic intrusions provide the heat source that drives the concentration of lithium and other valuable elements into pegmatite dykes.

For investors, understanding the importance of strike length along favourable geological structures is crucial. The additional 10km of strike length along the Leake Springs Metamorphic unit significantly increases Delta's chances of discovering additional mineralised zones similar to its existing resources.

Strategic Acquisition Terms

Delta has secured the Aston Project from Minerals 260 (ASX: MI6) through the following transaction:

• 100% purchase of fifteen tenements (E09/2114, E09/2156, E09/2302, E09/2358, and others)
• $450,000 cash payment
• 1.5% NSR (Net Smelter Royalty) on any future production of Lithium, Cesium, Beryllium, Rubidium, or Tantalum

This acquisition structure provides immediate control of the prospective ground while maintaining a reasonable upfront cost, with the royalty component designed to share future production value.

Development Timeline and Path Forward

Delta is pursuing a systematic exploration and development strategy:

1. Immediate term (Q2 2025):

   • Commence geochemical sampling and mapping across priority targets
   • Initiate geophysical surveys to refine structural understanding

2. Near term (H2 2025):

   • Complete hydrogeological program to assess water resources
   • Identify and prioritise drill targets based on integrated data

3. Medium term (2026):

   • Drill testing of priority targets
   • Resource expansion efforts at known deposits
   • Advance feasibility studies for potential development

The Investment Opportunity

Delta Lithium has positioned itself as a significant player in Western Australia's emerging lithium sector. The company has strategically assembled a dominant land position in the Upper Gascoyne region, with several factors making it compelling for investors:

1. Scale opportunity: With over 3,100km² of prospective ground, Delta controls one of the largest lithium exploration portfolios in the region.

2. Existing resource base: The current resource of 21.9Mt @ 1.0% Li₂O provides a solid foundation for growth.

3. Strategic positioning: The proximity to the Thirty-Three supersuite granites provides excellent geological potential for additional discoveries.

4. Experienced team: Delta's technical team has developed systematic exploration approaches specific to this geological terrain over the past two years.

5. Development pathway: The company is simultaneously advancing mining studies while expanding resources, targeting a comprehensive feasibility study.

Why Investors Should Watch Delta Lithium

Delta's recent acquisition reinforces its commitment to building a significant lithium resource base in Western Australia. The company has established itself as the dominant landholder in an emerging lithium province, with a clear strategy to systematically explore and develop its assets.

For investors seeking exposure to the lithium sector, Delta offers a balanced profile with:

• Existing resources providing fundamental value
• Significant exploration upside across a vast landholding
• Clear development pathways with multiple progress catalysts
• Strategic positioning in a tier-one mining jurisdiction

As global demand for lithium continues to grow, driven by electric vehicle adoption and energy storage requirements, companies with substantial resource potential in stable jurisdictions are well-positioned to benefit from this long-term trend.

Delta's expansion of the Yinnetharra Project represents another strategic step in establishing the company as a significant player in the lithium supply chain, with numerous catalysts for value creation in the coming months and years.

Ready to Be Part of Delta's Lithium Dominance?

Discover why Delta Lithium's strategic acquisition in Western Australia's Upper Gascoyne region positions them as a compelling investment opportunity. With an expanded 3,100km² landholding, established resources, and significant exploration potential, Delta is poised for growth in the global lithium market. Visit Delta's investor portal to learn more about their projects and how you can be part of their journey to become a major player in the lithium supply chain.