Stellar Reports 64m at 0.53% Sn Including 10m at 1.68% Sn in Latest Drillhole

Deep Tin Discovery at Severn

Stellar Resources Limited (ASX, SRZ) has announced a major breakthrough at its Heemskirk Tin Project in Western Tasmania, with drillhole ZS187 intersecting a substantial tin mineralisation zone at depth within the Severn deposit. The highlight is a 64.4-metre interval averaging 0.53% tin, including a high-grade core of 10.2 metres at 1.68% tin, starting from 560 metres downhole. This intercept lies 135 metres down dip from previous drilling, marking a significant extension of the known resource.

The discovery is particularly notable for its high-grade upper lode, which includes a 4-metre section grading 2.94% tin. These results align closely with earlier high-grade intersections from drillhole ZS166, reinforcing the geological continuity and potential scale of the tin system at Severn.

Advancing Resource Delineation and Expansion

The new drillhole not only confirms the presence of deep tin mineralisation but also supports the company’s strategy to upgrade the current 2023 Mineral Resource Estimate (MRE). Stellar is actively following up with wedge drilling around ZS187 to test for further extensions, with assays from the first wedge hole pending and a second wedge hole already underway. The company plans to add more wedge holes to explore the resource both to the south and at greater depths.

These drilling efforts are part of an expanded Resource and Prefeasibility Study (PFS) program, which has been extended following the encouraging results. The program now comprises 29 holes totaling approximately 12,000 metres, with two rigs currently operating. Stellar anticipates reporting updated resource estimates for both the Queen Hill and Severn deposits in the second half of 2025.

Prefeasibility Study Progress and Project Outlook

While the PFS was initially expected sooner, the company now projects completion in the first half of 2026 due to the expanded drilling scope. Alongside drilling, metallurgical test work has yielded promising ore sorting results, which could enhance tin recovery and concentrate grades. Environmental baseline studies are also advancing to support regulatory approvals.

Stellar’s Managing Director Simon Taylor emphasized the significance of the deep intercepts, noting the strong parallels with the long-life Renison Tin Mine nearby, which began with a modest reserve but has been mined continuously since 1968. This comparison underscores the potential longevity and scale of the Heemskirk project as it moves toward development readiness.

Strategic Implications for Tin Supply

Heemskirk’s high-grade tin resource, currently the highest-grade undeveloped tin deposit in Australia and third globally, positions Stellar Resources as a potentially important player in the global tin market. The company aims to produce 3,000 to 3,500 tonnes of payable tin annually, roughly 1% of global supply, pending successful project advancement.

With ongoing drilling success and a methodical approach to resource expansion and prefeasibility work, Stellar is steadily unlocking value in a tier-1 mining jurisdiction. The results from Severn add a compelling chapter to the project’s story, reinforcing its status as a world-class tin system with significant upside potential.