Four Drillholes Complete at Rolleston South, 1,287.9m Drilled to Date

Steady Progress at Rolleston South

Yari Minerals Limited (ASX – YAR) has reported the completion of four drillholes at its Rolleston South Coal Project in Queensland’s Bowen Basin, totaling 1,287.9 meters drilled to date. The drilling campaign continues to confirm the presence of thick, continuous coal seams consistent with previous exploration results, reinforcing the project's substantial coal resource base.

Despite challenges posed by wet ground conditions restricting access to some drill pads, the company remains on track to complete the remaining drillholes by late February to early March 2026. This steady progress underscores Yari’s commitment to advancing the project’s geological understanding and resource definition.

Detailed Laboratory Testing Underway

Core samples from the completed drillholes have been dispatched to specialized laboratories for comprehensive coal quality analysis. The testwork includes proximate analysis, washability profiling, yield determinations, petrography, and Crucible Swelling Number (CSN) measurements. These analyses are critical to assessing the coal’s suitability for various market applications, including potential metallurgical uses.

Yari’s Managing Director, Anthony Italiano, highlighted the importance of these tests in determining product characteristics such as ash content, yield, and CSN, which will inform future mining and marketing strategies. The results are expected to provide a clearer picture of the coal’s qualities and support ongoing geological interpretations.

Resource Upgrade Potential and Market Engagement

The data generated from the current drilling and forthcoming test results are anticipated to underpin efforts to upgrade a portion of the existing 190.1 million tonnes (Mt) Inferred Resource to Indicated status. This upgrade would enhance the confidence level in the resource estimate, a key milestone for advancing project development and attracting investment.

Strategically located within the Bowen Basin, Rolleston South benefits from proximity to established infrastructure, including the Blackwater Rail system and state highways, facilitating potential export pathways. Early-stage discussions with potential counterparties have commenced as Yari builds a more detailed understanding of the coal’s market potential.

Looking Ahead

Yari Minerals plans to provide further updates throughout the first quarter of 2026 as additional drilling data and coal quality results become available. The company also intends to continue geological reinterpretation and commence coal utilisation studies to explore the feasibility of producing semi-soft coking coal products, which could open new market opportunities.