Great Southern Mining has reported high-grade gold assays from its Golden Boulder prospect in Western Australia's Duketon Belt, extending known mineralisation along a 3.5-kilometer trend by up to 50 meters down-dip. The latest drilling results include standout intervals such as 4m at 11.38 grams per tonne and 9m at 3.36g/t gold, with the company's managing director Matthew Keane emphasizing the discovery’s high-grade potential from surface over a significant distance. Great Southern Mining plans to continue testing for deeper extensions beyond the current drilling depth of around 150 meters, aiming to complete the current phase by mid-to-late October.
Written locally by qwen2.5:14b on 2026-10-06,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Great Southern Mining looks to be turning its Golden Boulder prospect from a promising gold prospect into something far more substantial, with new assays confirming high-grade mineralisation from surface and continuity across the first 1.1km of a 3.5km mineralised trend in Western Australia’s Duketon Belt.
asserted
Mining → look → Belt
The results come from the company’s ongoing 14,000-metre reverse-circulation (RC) drilling program at Golden Boulder, a discovery within its 100 per cent-owned Duketon gold project.
asserted
results → come → project
The 549-square-kilometre holding sits in the Laverton–Duketon district and captures some serious gold-bearing real estate.
asserted
holding → sit → estate
It includes 7km of the Garden Well trend, 11km of the Rosemont trend and 8km of the Erlistoun trend - key structural corridors that host major gold deposits elsewhere in the belt.
asserted
that → include → belt
The latest 18 holes have delivered a standout 4m at 11.38 grams per tonne (g/t) gold from 45m, including 1m at 29.71g/t.
asserted
holes → deliver → /
Another hole returned 9m at 3.36g/t from 127m, including 4m at 6.77g/t, while other notable hits featured 2m at 7.27g/t from 70m and 3m at 3.88g/t from 60m.
All reported intervals are downhole lengths, with true widths yet to be confirmed.
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widths → return → m.
The assays have extended known mineralisation by up to 50m down-dip and identified high-grade mineralisation in previously undrilled sections.
asserted
assays → extend → sections
‘The company firmly believes that both Golden Boulder and the wider Duketon gold project has potential for a substantial gold endowment.’Great Southern Mining managing director Matthew Keane
asserted
Boulder → believe → Keane
Across Golden Boulder, mineralisation has been traced along three parallel trends called the Main Line, Eastern Line and Ogilvies.
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mineralisation → trace → trends
Drilling has intersected multiple stacked quartz-vein lodes with disseminated sulphides, including pyrite and arsenopyrite, hosted in basalt and minor dolerite.
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Drilling → intersect → basalt
The company is testing whether this network of steep gold-bearing structures continues below and between the shallow workings.
asserted
network → test → workings
The results also reinforce the prospect’s continuity.
asserted
results → reinforce → continuity
All but four of the 38 holes reported to date from the current RC program have returned mineralised intercepts grading above 0.7g/t gold, a pattern management says points to a prolific gold-bearing structural trend rather than a collection of isolated hits.
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management → report → hits
Great Southern Mining managing director Matthew Keane said: “These latest high-grade intercepts, in conjunction with previous results from 2025 and 2026 drilling, show that Golden Boulder is a high-grade gold discovery, mineralised from surface with continuity of mineralisation along ~1.1km of the 3.5km trend.
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Boulder → manage → trend
The company expects to complete the current campaign by mid-to-late October before immediately rolling into another phase of drilling.
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company → expect → drilling
Material step-outs at depth will be the focus, targeting extensions below an area that remains virtually untested, with few holes extending beyond 150m below surface.
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that → target → surface
Assays are pending for another 3425m from 39 holes at Golden Boulder, covering much of the remaining 2.5km of the Main Line trend.
asserted
Assays → pende → trend
A further 2248m from 18 RC holes is awaiting results at Amy Clarke, an emerging discovery 3km north-east of Golden Boulder where shallow mineralisation has been traced across 4.7km.
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mineralisation → await → km
The Golden Boulder area is steeped in history, with more than 50 mine shafts left by old-timers dotted across a 3.7km strike length.
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area → leave → length
Old-timers reportedly pulled out 1761 ounces of gold from 1915 tonnes of ore between 1900 and 1955 at a remarkable average grade of 28.6g/t.
Golden Boulder is one of several Duketon targets Great Southern is testing as it builds a broader gold inventory.
uncertain
it → pull → inventory
Amy Clarke is another emerging discovery, while Goldfinger is an additional target within the company’s 100 per cent-owned holding.
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Goldfinger → emerge → holding
Nearby, Regis Resources has defined more than 7.5 million ounces just north of Great Southern’s tenure, including the two-million-ounce Rosemont deposit and the five-million-ounce Garden Well mine.
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Resources → define → deposit
Golden Boulder sits 26km from Rosemont and 14km from Regis’ Garden Well mine and processing facility.
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Boulder → sit → mine
With gold commanding around US$4142 (A$5943) an ounce, a sizeable system near established roads and processing infrastructure could carry real strategic weight if drilling confirms its scale.
uncertain
drilling → command → scale
With high-grade gold consistently being hit from surface and a 3.5km mineralised corridor wide open at depth, Golden Boulder has plenty of room to grow.
asserted
Boulder → hit → room
Upcoming assays and the next phase of drilling could now determine whether it can earn its place as a genuine Duketon gold system.
uncertain
it → determine → system
Is your ASX-listed company doing something interesting?
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company → list → something
The Aporia
