Rolleston South Drilling Reveals Up to 3m Thick Low-Ash Coal Seams

Exploration Success at Rolleston South

Yari Minerals Limited has delivered encouraging exploration results from its Rolleston South Coal Project in Queensland’s Bowen Basin. Recent drilling has intercepted thick, continuous coal seams measuring up to 3 meters, surpassing previous resource model predictions. This development not only confirms the geological continuity of the deposit but also reduces the risk associated with structural complexities, as no faults were encountered in the initial drill holes.

Coal Quality Points to Metallurgical Potential

Preliminary coal quality testing reveals a clean, low-ash product with high yield, characteristics more aligned with semi-soft metallurgical coal rather than the standard thermal coal traditionally associated with the project. This distinction is significant, as metallurgical coal commands a premium in steelmaking markets. The coal’s crucible swell number, a key indicator of coking potential, ranges between 1.0 and 1.5, suggesting promising semi-soft coking properties pending further detailed assay work.

Resource Upgrade and Infrastructure Advantages

The thicker seams observed in drill holes RSC014 and RSC015C support the potential upgrade of a portion of the existing 190.1 million tonnes Inferred Resource to Indicated status. This upgrade would enhance the project’s attractiveness to investors and potential partners by increasing confidence in the resource’s economic viability. Additionally, the project benefits from excellent infrastructure, including proximity to a state highway and access to the Blackwater Rail system, facilitating efficient transport to export ports.

Ongoing Drilling and Testing

With the 2025 drilling campaign at its midpoint, Yari has mobilized a second reverse circulation rig to accelerate exploration activities. Further drilling aims to expand the resource base and refine coal quality data. Detailed washability and metallurgical testing are underway to confirm the coal’s suitability for semi-soft coking applications. These efforts will inform future mine planning and potential product positioning in the market.

Looking Ahead

Yari’s Managing Director, Anthony Italiano, expressed optimism about the results, emphasizing the importance of ongoing assay work to fully characterize the coal’s qualities. The company plans to continue its methodical approach to resource definition and product testing, with updates expected as new data emerges. This disciplined progression underscores Yari’s commitment to unlocking the full value of the Rolleston South asset.