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Fluorescent Glow of Spodumene Chips from Jameson - A Leslie

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 in March 2025, following infill drilling at the Malinda Deposit and first pass drilling at the Jameson Deposit. 

At Malinda, the Indicated lithium Mineral Resource increased by 

, underpinned by a consistent 40m x 40m drill spacing. Importantly, 74% of the lithium MRE across Yinnetharra is now classified as Indicated, underpinning  the foundation for future feasibility studies and development opportunities. The total updated lithium MRE stands at 

, with a modest 15% reduction in tonnes due to refined wireframes and improved geological modelling.

Furthermore, exploration success at the Jameson Deposit delivered a high-grade maiden MRE of 

, with mineralisation remaining open down plunge, underscoring the significant growth potential still to come at Yinnetharra.

Delta Lithium’s Malinda Deposit hosts three primary LCT pegmatites – M1, M36 and M47 – each demonstrating excellent widths and consistently high-grade lithium assays. Mineralisation has been confirmed from surface to depths of at least 350 metres, with a strike length extending more than two kilometres east to west. 

Feasibility-level metallurgy on the M1 pegmatite has been successfully completed through a five-tonne pilot program, with low-grade variability testwork also delivering positive results. With a Mining Lease Application lodged at Malinda, Delta Lithium is well positioned to transition the project towards development.

Building on the strong progress to date, Delta Lithium is advancing a clear pathway to unlock further value across the Yinnetharra Project. Next steps include:

Expanding regional fieldwork over the recent tenement acquisitions, including soil sampling and mapping, to identify and define new prospects

Undertaking scheduled heritage, flora, and fauna surveys to enable ongoing development activities

Advancing regulatory approvals and continuing constructive Native Title discussions

Mining Lease application at Malinda submitted for approval

Prioritising follow-up drilling at Jameson to build on previous encouraging results

Tantalum is emerging as a valuable by-product opportunity at the Yinnetharra Lithium Project, providing further upside to the development pathway. An updated Mineral Resource Estimate (MRE) outside the lithium wireframes has defined 

, which sits within the existing lithium resource pit shells used for MRE calculations.

In total, the Malinda area now hosts a tantalum MRE of 

, highlighting the potential for a meaningful value-add alongside the project’s core lithium resources.

GROWING A CRITICAL MINERALS DISCOVERY IN THE EMERGING GASCOYNE PROVINCE

The Yinnetharra Lithium Project, located in Western Australia’s emerging Gascoyne Lithium Province, is one of Delta Lithium’s cornerstone assets. Acquired in September 2022, the project has been the focus of extensive exploration, with drilling concentrated at the Malinda Deposit. By the end of FY25, more than 

 had been completed across the broader landholding, rapidly advancing the Yinnetharra Project as a significant new lithium discovery.

Exploration drilling at the Jameson Deposit in 2024 delivered a high-grade maiden Mineral Resource Estimate (MRE) of 

, with mineralisation remaining open at depth. Located just 20km west of the Malinda Prospect, Jameson presents strong potential as a satellite ore source.

The J1 pegmatite, which hosts the resource, has intruded into a highly deformed fold hinge within the same Leake Springs Metamorphic package that underpins the Malinda resource.

Access during the initial drilling phase was limited. Planning for a second phase of drilling is now underway in close coordination with the local heritage group to ensure culturally significant sites are respected and protected. In parallel, detailed mapping at Jameson and Jameson South has identified several high-priority targets, with follow-up drilling scheduled to commence later this year.

Delta Lithium controls a highly prospective exploration package of more than 

 at the Yinnetharra Project. These additions align with Delta’s growth strategy of resource expansion, discovery, and advancing the project towards feasibility.

The expanded tenure firmly establishes Delta as the leading lithium company in the Upper Gascoyne province, with over 

 across prospective sediment and mafic lithologies. This scale and geological endowment provide significant potential for resource growth through multiple emerging prospects.