Greatland extends high grade footprint at West Dome Underground with broad gold copper hits

Greatland Resources has reported a fresh suite of wide, high grade gold and copper intercepts from its West Dome Underground prospect at Telfer, reinforcing the scale and continuity of the emerging system. The company has completed 19 holes totalling over 9,000 metres in its Phase 2 FY26 programme, with early assays from nine holes demonstrating an expanding mineralised footprint and higher grade zones to the south. The drilling campaign targets resource growth ahead of a planned maiden Mineral Resource Estimate scheduled for the March 2026 quarter.

Increasing drill density has refined understanding of the West Dome system, confirming three distinct mineralised domains: the broad, sub vertical Western Stockwork Corridor, the high grade Western Limb, and the high grade Eastern Limb. All three sit within or adjacent to the Lower Limey Unit, a key geological control for gold and copper mineralisation across the Telfer camp.

Recent drilling in the Western Stockwork Corridor has delivered what Greatland describes as exceptional widths, with stockwork mineralisation now defined across a true width of 40 to 70 metres and extending more than 200 metres down dip. Notable intercepts include 82.2 metres at 1.90 grammes per tonne gold and 0.31 per cent copper from 360.7 metres, 56.6 metres at 2.24 grammes per tonne gold and 1.26 per cent copper from 337 metres, and 66.5 metres at 1.18 grammes per tonne gold and 0.16 per cent copper from 334 metres. Mineralisation in the corridor has now been traced over 700 metres of strike and remains open.

The Western Limb continues to return some of the strongest grades observed at West Dome, with Lower Limey Unit hosted mineralisation now drilled over 500 metres of strike and open in both directions. Recent highlights include 34.5 metres at 4.06 grammes per tonne gold and 0.31 per cent copper from 418.5 metres, 29 metres at 1.86 grammes per tonne gold and 0.34 per cent copper from 341 metres, and 5.5 metres at 3.57 grammes per tonne gold and 0.29 per cent copper from 389 metres.

The Eastern Limb is firming as a second high grade target, with drilling to the south returning grades comparable to the Western Limb. Results include 30 metres at 5.6 grammes per tonne gold and 0.25 per cent copper from 281 metres, 35 metres at 2.9 grammes per tonne gold and 0.19 per cent copper from 234 metres, and 26.6 metres at 2.7 grammes per tonne gold and 0.30 per cent copper from 302 metres. Both limbs remain open along strike and down dip.

The West Dome Underground opportunity benefits from proximity to Telfer’s existing underground mine, with substantial spare capacity across crushing, haulage, ventilation and power infrastructure. The Main Dome Underground previously supported mining rates above 5 million tonnes per annum and currently operates at approximately 1.2 million tonnes per annum, leaving room for additional ore sources.

A pre feasibility study is under way to assess optimal use of Main Dome Underground infrastructure, including the underground crusher, 6 million tonnes per annum hoisting shaft and existing ventilation system, and to evaluate potential processing optimisation alongside future Havieron ore.

Development work continues to advance. The second parallel access drive from Main Dome Underground toward West Dome Underground has reached roughly 1,100 metres, about 60 per cent of the distance to the current drill area, and will allow increased drilling rates and optionality for early works once complete.

Managing director Shaun Day said the latest results emphasise the scale and optionality emerging at West Dome Underground. He noted that the Main Dome Underground began production almost 20 years ago and continues operating today, having produced more than 3 million ounces of gold to date. Day said West Dome Underground drilling confirms that key geological units and mineralisation styles at the Main Dome Underground are present at the West Dome Underground and continues to deliver high grades and excellent widths.

Day described access to the West Dome Underground as effectively opening access to a new quartile of the Telfer mine, being the two open pits and potentially the opportunity to start a second underground mine. The strong results have prompted the company to allocate a third diamond rig to West Dome Underground, which will also support the upcoming Mineral Resource Estimate. The pre feasibility study will assess how the substantial existing infrastructure capacity at the Main Dome Underground can be leveraged to deliver a pathway to production.