Greatland Resources Ltd (AIM:GGP, OTC:GRLGF, ASX:GGP) has strengthened the growth case for its emerging West Dome Underground (WDU) opportunity at Telfer, reporting another round of wide, high-grade gold-copper intercepts that reinforce the scale and continuity of the system.
The company has now completed 19 holes for more than 9,000 metres in its Phase 2 FY26 program, with early results from nine holes highlighting an expanding mineralised footprint and higher-grade zones to the south. Drilling is targeting growth ahead of a planned maiden Mineral Resource Estimate (MRE) in the March 2026 quarter.
Telfer Deposit mine area Location Map
Three domains confirmed as drilling density increases
Increasing drill density has refined Greatland’s understanding of the West Dome system, confirming three distinct mineralised domains:
- the broad, sub-vertical Western Stockwork Corridor (WSC)
- the high-grade Western Limb
- the high-grade Eastern Limb
All three sit within or adjacent to the Lower Limey Unit (LLU), a key geological control for gold-copper mineralisation across the Telfer camp.
Recent drilling in the WSC has delivered what Greatland describes as “exceptional” widths, with stockwork mineralisation now defined across a true width of 40–70 metres and more than 200 metres down-dip. Notable intercepts include:
- 82.2 metres at 1.90 g/t gold and 0.31% copper from 360.7 metres
- 56.6 metres at 2.24 g/t gold and 1.26% copper from 337 metres
- 66.5 metres at 1.18 g/t gold and 0.16% copper from 334 metres
Mineralisation in the corridor has now been traced over 700 metres of strike and remains open.
West Dome Underground Geological Type Section
High-grade limbs continue to deliver
The Western Limb continues to return some of the strongest grades seen at West Dome, with LLU-hosted mineralisation now drilled over 500 metres of strike and open in both directions. Recent highlights include:
- 34.5 metres at 4.06 g/t gold and 0.31% copper from 418.5 metres
- 29 metres at 1.86 g/t gold and 0.34% copper from 341 metres
- 5.5 metres at 3.57 g/t gold and 0.29% copper from 389 metres
Meanwhile, 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 g/t gold and 0.25% copper from 281 metres
- 35 metres at 2.9 g/t gold and 0.19% copper from 234 metres
- 26.6 metres at 2.7 g/t gold and 0.30% copper from 302 metres
Both limbs remain open along strike and down dip.
West Dome Underground “3D Isometric view” looking north
Leveraging Telfer infrastructure as development study advances
The WDU 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 (MDU) previously supported mining rates above 5 million tonnes per annum (Mtpa) and is currently operating at around 1.2Mtpa, leaving room for additional ore sources.
MDU shaft headframe (left), underground conveyor system (right)
A pre-feasibility study is under way to assess the optimal use of MDU’s infrastructure — including the underground crusher, 6Mtpa hoisting shaft and existing ventilation system — and evaluate potential processing optimisation alongside future Havieron ore.
MDU water pumping station (left) and paste plant (right foreground)
Development work also continues to advance. The second parallel access drive from MDU toward WDU has reached roughly 1,100 metres — about 60% of the distance to the current drill area — and will allow increased drilling rates and optionality for early works once complete.
A ‘new quartile’ of Telfer
Managing director Shaun Day said the latest results emphasise the scale and optionality emerging at West Dome Underground.
“We continue to see excellent drilling results and progress at the compelling West Dome Underground project,” he said.
“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. Our 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.
“Access to the West Dome Underground effectively opens access to a new quartile of the Telfer mine, being the two open pits and potentially the opportunity to start a second underground mine.”
Day said the strong results have prompted the company to allocate a third diamond rig to the WDU, which will also support the upcoming MRE. The PFS will assess “how the substantial existing infrastructure capacity at the Main Dome Underground can be leveraged to deliver a pathway to production”, he added.