Great Southern Mining's Golden Boulder Discovery Continues to Impress with High-Grade Gold Hits
Great Southern Mining has delivered another round of promising results from its ongoing exploration efforts at the Golden Boulder discovery, located within the Duketon gold project in Western Australia's Eastern Goldfields region. The latest assays from a reverse circulation drilling program have reinforced the potential for a substantial, shallow, high-grade gold system in this proven gold-producing neighbourhood.
Latest Drilling Results Showcase Strong Gold Grades
Conducted in late 2025, the initial assays from the first 27 holes of a 56-hole program have already generated significant excitement. The results indicate that gold mineralisation begins at or near the surface, which is a highly favourable characteristic for potential mining operations.
Standout intercepts from this batch include:
- 6 metres at 6.7 grams per tonne gold from 48 metres depth, featuring a 1-metre section grading a remarkable 34.5 grams per tonne gold.
- 5 metres at 5.1 grams per tonne gold from 25 metres depth, including a 1-metre interval running at an impressive 23.9 grams per tonne gold.
These latest findings build upon previous reverse circulation campaigns at Golden Boulder, which had already returned notable intersections such as 5 metres at 14.57 grams per tonne gold from 41 metres depth, including a 1-metre slice grading a substantial 70.94 grams per tonne gold.
Historical Context and Geological Significance
The Golden Boulder area has a rich mining history, with recorded production between 1900 and 1955 yielding 1,915 tonnes mined at an average grade of 28.6 grams per tonne gold for approximately 1,761 ounces of gold. However, historical drilling at the site has been relatively shallow and sparse, with very few holes exceeding 40 metres in depth.
According to Great Southern Mining managing director Matthew Keane, "Early drilling results from the late-2025 RC program at Golden Boulder have delivered a very strong start, reinforcing our confidence in the continuity of shallow, high-grade mineralisation in the northern portion of the 3.7km prospective trend. It is shaping up to be a very exciting gold discovery in a prolific gold-producing region."
Geologically, the gold at Golden Boulder is hosted within a fractionated dolerite rock unit, which bears similarity to the famous Golden Mile in Kalgoorlie. The mineralisation occurs as stacked lodes within the Rosemont fault zone, a 60-kilometre-long geological structure that hosts multiple significant gold deposits owned by ASX-listed Regis Resources.
Exploration Expansion and Future Prospects
With 29 holes still awaiting assay results from the current program, there is clear potential for additional positive news in the near term. These remaining holes are located further south along the Rosemont Fault, where drilling density has historically been sparse and the mineralised system remains open for potential extensions.
Great Southern Mining is also preparing for a deeper diamond drilling program, which will be partially funded under Western Australia's Exploration Incentive Scheme. This program aims to test the Golden Boulder discovery at greater depths while continuing reverse circulation work along strike.
The company is simultaneously advancing exploration at its Amy Clarke prospect, another emerging target along the same Rosemont fault corridor. Recent work at Amy Clarke has defined a 5-kilometre surface gold anomaly, with previous drilling returning intercepts including 8 metres grading 6.73 grams per tonne gold from 32 metres depth.
Potential for Significant Resource Development
If the stacked lodes at Golden Boulder prove to be as regular and extensive as those found in the Kalgoorlie region, this discovery could rapidly transition from an interesting exploration target to a serious resource candidate. The Eastern Goldfields region has a well-established reputation for transforming modest prospects into long-life mining operations, and Golden Boulder appears to possess several key attributes that could support such development.
The combination of shallow, high-grade mineralisation in a proven gold-producing region positions Golden Boulder as a discovery with genuine potential for further advancement. As exploration continues and more results become available, the true scale and significance of this find will become increasingly clear.
