Greatland Resources Uncovers Expanding High-Grade Gold-Copper Zones at West Dome

Expanding Mineralisation at West Dome

Greatland Resources Limited has delivered a robust update on its West Dome Underground (WDU) project, part of the broader Telfer mine complex in Western Australia. The company has completed more than 9,000 metres of drilling in its Phase 2 program, with results from nine holes underscoring a growing footprint of high-grade gold and copper mineralisation. This drilling has focused on the southern extension of the mineralised system, revealing three distinct mineralised domains – the Western Stockwork Corridor (WSC), Western Limb, and Eastern Limb.

The WSC, a broad sub-vertical zone of stockwork veins, has returned impressive intercepts such as 56.6 metres at 2.24 grams per tonne (g/t) gold and 1.26% copper, and 82.2 metres at 1.90 g/t gold and 0.31% copper. These widths and grades suggest a substantial and continuous mineralised system that remains open along strike and at depth.

High-Grade Continuity in Western and Eastern Limbs

Alongside the WSC, the Western and Eastern Limbs continue to deliver high-grade results. The Western Limb has yielded intercepts like 34.5 metres at 4.06 g/t gold and 0.31% copper, while the Eastern Limb has produced 30 metres at 5.6 g/t gold and 0.25% copper. Both limbs extend over 500 metres in strike length and remain open, indicating further upside potential.

These results reinforce the geological continuity and grade consistency across the WDU, which is hosted within the Lower Limey Unit; a key horizon for gold-copper mineralisation at Telfer.

Leveraging Existing Infrastructure for Accelerated Development

Greatland is advancing development work in parallel with exploration. The adjacent Main Dome Underground (MDU) infrastructure, which historically supported mining rates exceeding 5 million tonnes per annum (Mtpa), offers significant capacity to accelerate a new mine at WDU. The company is progressing a second development drive, now approximately 60% complete, which will enhance ventilation and access for drilling and early works.

A pre-feasibility study is underway to evaluate the integration of WDU with existing MDU infrastructure, including haulage, ventilation, and processing facilities. This approach could reduce capital intensity and shorten timelines to production.

Outlook and Next Steps

To support the upcoming maiden Mineral Resource estimate targeted for the March 2026 quarter, Greatland has allocated a third diamond drill rig to accelerate exploration. The company’s Managing Director, Shaun Day, highlighted the strategic importance of WDU as a potential second underground mine at Telfer, complementing the existing open pits and Main Dome operations.

With ongoing drilling planned to infill and extend mineralisation, and a comprehensive study program underway, Greatland is positioning the West Dome Underground project as a significant contributor to its long-term gold-copper portfolio in the Paterson Province.