Terra Metals’ Southwest 1.1 km strike: scale and mine design notes for planners
Reviewed by Joe Ashwell

First reported on Australian Mining
30 Second Briefing
Terra Metals has extended the main sulphide corridor at its Southwest PGM–copper–nickel discovery in Western Australia by 150m to more than 1.1km, following diamond drill hole SWDD017 pushing the interpreted northern limit of mineralisation. The corridor forms part of the broader Dante project and the step-out represents roughly a 15 per cent strike increase, materially enlarging the potential resource footprint. For mine planners and geotechnical teams, the longer continuous sulphide zone supports larger-scale underground or bulk open-pit scenarios, subject to grade continuity and geometry.
Technical Brief
- Diamond drill hole SWDD017 was targeted as a northern step-out to test open mineralisation.
- Hole SWDD017 intersected the same main sulphide corridor hosting PGM–Cu–Ni mineralisation at Southwest.
- Terra Metals is progressively defining corridor geometry to support future underground or bulk‑tonnage pit optimisation.
- Step‑out success at Dante supports a staged drilling strategy: infill for continuity, then deeper down‑dip targeting.
- For analogous mafic–ultramafic PGM–Ni–Cu systems, such corridor extensions often trigger early geotechnical scoping for pit wall and underground access designs.
Our Take
Infill RC results from June 2026 at the Dante project already confirmed continuous copper–nickel–cobalt sulphides, so extending the Southwest strike suggests Terra Metals may be converging on a more coherent, camp-scale magmatic system rather than a series of isolated lenses.
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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