Saturn’s Apollo Hill DFS push: pit scale and slope design notes for mine planners
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Saturn Metals has confirmed gold mineralisation up to 1km north of the current resource at its Apollo Hill project in Western Australia, following wide‑spaced step‑out drilling during the September quarter that extended known gold‑bearing structures. The work supports preparation of a definitive feasibility study and updated ore reserve, signalling potential for a larger open‑pit inventory than previously modelled. For mine planners and geotechs, the emerging scale will influence pit shell optimisation, geotechnical slope design and haulage layout across the expanded mineralised corridor.
Technical Brief
- Wide-spaced step-out drilling pattern implies early-stage structural targeting rather than detailed grade-control spacing.
- Confirmation of structural continuity northwards reduces geological risk for extending pit designs along strike.
- New intercepts will require revised geotechnical domains and wall design sectors across the extended corridor.
- Additional drilling lines will likely be needed to convert step-out indications into Measured/Indicated categories for DFS.
- Expanded mineralised footprint may necessitate re-optimisation of haul road alignments and waste-dump locations on the lease.
- Hydrogeological characterisation must now consider a longer pit perimeter and potentially altered dewatering requirements.
Our Take
Our database shows a steady sequence of Apollo Hill updates through 2025–26 – resource growth to 2.83Moz, 1km of strike extension and heap leach test work – which signals Saturn Metals is deliberately de‑risking the Western Australian project ahead of committing to full feasibility.
With Ausenco already engaged on a standalone operation scoping study at Apollo Hill, any move towards feasibility in Western Australia is likely to leverage that early flowsheet and plant configuration work rather than start from a blank sheet.
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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