Delta Lithium Advances Mt Ida Lithium and Expands Yinnetharra Fluorite Prospects

Mt Ida Drilling Reinforces Lithium Potential

Delta Lithium (ASX:DLI) strengthened its Mt Ida lithium narrative this quarter with further high-grade intercepts that deepen confidence in the project’s resource model. Notably, a diamond drill hole (BDG001) intercepted 11.9 metres grading 1.36% Li2O at a depth of 423 metres, hitting a footwall pegmatite approximately 100 metres below the Sister Sam deposit. This result, sitting at the edge of the current model, hints at down-dip continuity and fresh targets for future drilling campaigns.

Additional infill drilling has refined the Mineral Resource Estimate (MRE), with significant intercepts such as 7.4 metres at 1.36% Li2O from 219 metres (DFS674A) further underpinning the deposit’s quality. The company is leveraging diamond core from these holes for advanced metallurgical testwork aimed at optimising and de-risking the processing flowsheet.

With the scoping study for Mt Ida now underway, Delta is investigating onsite lithium ore production and concentration, including the potential for byproduct credits such as rubidium and tantalum. The study’s results are anticipated before year-end, potentially providing a clearer pathway to development.

Yinnetharra Expands with Fluorite Breakthroughs and Tenement Acquisitions

Delta’s Yinnetharra project continues to evolve beyond lithium, with exploration uncovering extensive fluorite mineralisation across a broad regional footprint. Surface rock chip assays have returned exceptional grades, including 86.09% CaF2 and 85.89% CaF2 at distinct locations more than 16 kilometres apart. These findings suggest the presence of a large-scale fluorite system, a commodity with diverse industrial applications.

Complementing surface sampling, a shallow drilling campaign totalling 876 metres confirmed high-grade fluorite at depth, including intercepts such as 8 metres at 18% CaF2 and 2 metres at 23% CaF2. This early-stage work is enhancing geological understanding of both vein-hosted and granite/greisen-hosted fluorite mineralisation, with pathfinder elements like lead and bismuth aiding exploration targeting.

Adding strategic value, Delta completed the acquisition of tenements previously under a joint venture with Reach Resources, including the Morrissey Hill and Camel Hill projects. This move grants Delta 100% ownership of these highly prospective lithium-caesium-tantalum pegmatite targets, providing greater control over exploration timing and strategy.

Corporate Stability and Management Changes

Delta ended the quarter with a strong cash balance of $49.6 million, supporting ongoing exploration and development activities. Exploration expenditure for the quarter stood at $2.058 million, reflecting active field programs and testwork.

The company also refreshed its geology leadership, with Olaf Frederickson stepping in as Geology Manager. Frederickson brings three decades of experience across lithium, gold, iron ore, and mineral sands, with a focus on resource estimation and exploration, positioning Delta to advance its resource base effectively.

Meanwhile, Delta terminated its joint venture agreement with Voltaic Strategic Resources over the Ti-Tree project by mutual consent, streamlining its portfolio to focus on core assets.