Great Southern Mining has started a 1,300m diamond drill program at Mt Dillon in Queensland, targeting epithermal gold-silver systems under a Gold Fields earn-in JV.
Great Southern Mining has started diamond drilling at the Mt Dillon target within the Edinburgh Park project in Queensland. The program will run up to 1,300 metres.
The project covers 1,447 square kilometres in a region known for large epithermal and intrusion-related gold systems. Neighbouring deposits include Ravenswood (10 million ounces) and Mt Leyshon (3 million ounces).
Drilling is managed and funded by G-Ex Resources, a wholly owned Gold Fields subsidiary. Under the earn-in joint venture, Gold Fields can spend up to $15 million to earn a 75% interest in Edinburgh Park.
The Mt Dillon target was defined through gradient array IP surveys conducted in early 2025. Those surveys outlined a large-scale chargeability anomaly. A follow-up pole-dipole survey showed a chargeable response roughly 200 to 300 metres below surface, with a resistivity anomaly below it. The company interprets the resistivity feature as a zone of pervasive hydrothermal alteration within a porphyry system.
Matthew Keane, managing director, said drilling will take four to six weeks.
"This is an exciting chapter for the Edinburgh Park project, with Mt Dillon representing the highest-priority target defined to date," he said.
"The Mt Dillon target contains a number of compelling attributes including shallow IP anomalism below a preserved lithocap and multi-element anomalism which is consistent with epithermal and/or intrusion-related systems.
"The scale and prospectivity of the Edinburgh Park Project are expected to generate numerous targets beyond Mt Dillon. Further geochemical and geophysical surveys through 2026/2027 will generate the next wave of drill targets."
The mineralisation being targeted includes both high and low epithermal gold-silver systems within the Permian volcanic geology, as well as porphyry gold-copper-molybdenum and intrusion-related gold mineralisation in the basement Carboniferous geology.
GSN shares were steady at 2.2 cents, giving a market capitalisation of $24.99 million.
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