Great Southern Mining has initiated deep diamond drilling at its Golden Boulder discovery in Western Australia, supported by government co-funding and a recent capital raise. This marks a pivotal step in exploring the source of multiple gold mineralisation trends within the Duketon Gold Project.
- Deep diamond drilling commenced at Golden Boulder targeting structures up to 700m depth
- Western Australian Government Exploration Incentive Scheme co-funding secured for initial holes
- Second diamond hole to test Main Line mineralisation with strong previous gold intercepts
- Major 10,000–15,000 metre RC drilling programs planned for Golden Boulder and Amy Clarke in 2026
- Completed 804m diamond hole at Diorite Hill targeting PGE-base metals with core analysis underway
Exploration Deepens at Golden Boulder
Great Southern Mining Limited (GSN) has taken a significant step forward in its exploration efforts by commencing deep diamond drilling at the Golden Boulder discovery, part of its 100% owned Duketon Gold Project in Western Australia. This drilling campaign is notable not only for its depth; reaching up to 700 metres; but also for its strategic focus on understanding the deep-seated geological structures believed to be the source of multiple shallow gold mineralisation trends previously identified.
The initial diamond hole, co-funded by the Western Australian Government’s Exploration Incentive Scheme (EIS), targets the Ogilvies prospect within Golden Boulder. This is the first diamond drilling in the area and the first hole to extend beyond 155 metres depth in the primary mineralised zone. By probing these structurally complex zones where major faults converge, GSN aims to uncover the deeper roots of the gold system that surface drilling has only hinted at so far.
Building on Strong Historical Intercepts
A second diamond hole is planned to test the Main Line mineralisation, a trend that extends over 3.5 kilometres and has yielded impressive gold intercepts in previous reverse circulation drilling. Highlights from earlier campaigns include intercepts such as 5 metres at 14.57 grams per tonne gold and a standout 1 metre at 70.94 grams per tonne, underscoring the potential richness of the deposit. This hole will provide critical geological data to better understand the controls on mineralisation along this key trend.
Looking ahead, GSN has scheduled major drilling programs at both Golden Boulder and the nearby Amy Clarke discovery, with plans to drill between 10,000 and 15,000 metres starting in late April to May 2026. Amy Clarke itself has shown promising mineralisation over a 4.7-kilometre strike, with notable intercepts including 17 metres at 1.4 grams per tonne gold, indicating a robust exploration pipeline.
Expanding Exploration Beyond Gold
In addition to its gold-focused drilling, GSN recently completed an 804-metre diamond hole at the Diorite Hill Layered Intrusive Complex within the East Laverton Project. This hole targets potential reef-style platinum group elements (PGE), nickel, and copper mineralisation. Core logging and sampling are underway, with early observations revealing complex sequences of ultramafic and mafic rocks and trace sulphide minerals, which could signal the presence of valuable base metals.
GSN’s Managing Director, Matthew Keane, emphasised the importance of this drilling phase, noting the company’s belief that the shallow gold mineralisation observed to date may be the surface expression of a much larger and deeper gold system. He also acknowledged the critical support from the Western Australian Government’s EIS program, which helps de-risk and accelerate exploration activities.
Financially, GSN is well positioned to execute these ambitious exploration plans, having recently completed a strongly supported A$4.6 million equity capital raising in March 2026. This funding underpins the company’s confidence in advancing its projects and unlocking value for shareholders.
Bottom Line?
As GSN probes deeper beneath Golden Boulder, the coming drill results could redefine the scale of its gold system and shape its next growth phase.
Questions in the middle?
- Will the deep diamond drilling confirm the presence of a significant gold source at depth?
- How will the new geological data influence GSN’s exploration strategy across the Duketon Gold Project?
- What potential does the Diorite Hill drilling hold for expanding GSN’s base metals portfolio?