Great Southern Mining Starts 20,000m Laverton Drilling Campaign

Great Southern Mining (ASX: GSN) is mobilising rigs for a 20,000-metre reverse circulation drilling program at its Duketon and Mon Ami gold projects in Western Australia's Laverton region. The campaign targets growth at the Golden Boulder and Amy Clarke discoveries alongside extensions to the Mon Ami deposit, and is fully funded after the final tranche of a $4.6 million equity placement settled in early June.

Golden Boulder gets the most attention. Previous drilling outlined mineralisation over 3.5km of strike that remains open both along strike and at depth. A recent diamond hole extended known mineralisation by 40 metres down-dip – a result the company sees as evidence that the system has meaningful depth potential. That hole returned 2 metres at 1.81 grams per tonne gold from 38.5 metres and 0.25 metres at 1.87 g/t from 88.47 metres. The upcoming work will test continuity across the northern 1.9km of the Main Line trend and extend mineralisation at depth. It will also infill broader-spaced drill lines across the southern 1.6km.

Amy Clarke follows a shallow aircore campaign in 2021 and another in 2025 that delineated gold mineralisation over 4.7km of strike. Earlier results included 17 metres at 1.4 g/t gold from 20 metres and 2 metres at 23.9 g/t gold from 10 metres. Drilling here will test extensions at depth and along strike in higher-grade zones.

Mon Ami already carries a JORC resource of 1.56 million tonnes at 1.11 g/t gold for 55,500 ounces. The deposit remains open to the north, north-west, and down-dip. New holes will test known gold-bearing lodes and a potential repeat structure at the Blanc Platt target.

Golden Boulder sits on a north-south structural trend that hosts several deposits now owned by Regis Resources (ASX: RRL), including Rosemont, Baneygo, and Ben Hur. The analogue matters because those mines have been worked at commercial scale. The question is whether the Golden Boulder system can deliver similar volume below the shallow intercepts drilled so far.

Managing director Matthew Keane said the company was keen to return to the Duketon Gold Belt after successful late-2025 programs. 'Both are mineralised from near surface, and have only been drilled to less than 150 metres below surface to date,' he said. 'Great Southern's portfolio of Western Australian gold projects presents compelling growth opportunities–the upcoming major drill program is aimed at unlocking this value.'

The program is the largest Great Southern has undertaken since acquiring the Duketon tenure in 2021. The first batch of results will be the key catalyst. Any hole that repeats the 40-metre down-dip extension at Golden Boulder or drills through strong grade at Amy Clarke will shift the outlook. Results are expected through the September quarter.

– This article was filed for the Small Caps desk.