Alkane extends gold–antimony system at Nagambie: design and geotech notes for mine planners
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Alkane Resources has extended the known gold–antimony mineralised system at its Nagambie project in Victoria, with initial drilling intersecting high-grade mineralisation 115m below the previously defined limit. The latest holes confirm vertical continuity of the system and identify broader mineralised zones with estimated true widths up to 32m, suggesting thicker, potentially bulk-mineable intervals. For resource modellers and geotechnical planners, the deeper, wider zones will affect pit–underground transition assumptions, stope design and ground support requirements as drilling advances.
Technical Brief
- Diamond drilling at Nagambie targets the gold–antimony system at depth beneath existing workings.
- High-grade intersections are associated with sulphidic, structurally controlled zones typical of orogenic gold–stibnite systems.
- Broader mineralised intervals imply potential for wider stopes, affecting dilution assumptions and ground support layouts.
- Deeper intercepts will require updated geotechnical domains, including stress regime and rock mass characterisation at new levels.
- Antimony association introduces metallurgical complexity, influencing processing route selection and concentrate marketing strategy.
- Step-out drilling geometry will drive future drill platform locations, collar spacing and underground access development concepts.
- For similar Victorian orogenic systems, such depth extensions often trigger re-optimisation of pit shells and underground cut-off grades.
Our Take
Alkane Resources is emerging as one of the more active Australian gold–antimony players in our database, with Nagambie in Victoria complementing its work on a new high‑grade zone at the Costerfield gold–antimony mine reported on 24 August 2026, suggesting a deliberate build‑out of expertise in this specific metal pairing.
The extension of the Nagambie system in Victoria gives Alkane geographic diversification from its deeper gold–copper drilling at Peak Hill in New South Wales (15 October 2026 article), which can help balance exploration risk between shallow, structurally complex antimony‑rich systems and very deep copper–gold targets.
With Larvotto Resources restarting Hillgrove as a gold–antimony operation in New South Wales (1 September 2026), Alkane’s Nagambie work adds to a small but growing cluster of Australian gold–antimony projects in our coverage, which may strengthen the case for shared processing know‑how and potentially regional offtake interest in antimony from Victoria and NSW combined.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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