Minerals 260 high-grade gold intercept: pit design and planning notes for engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Minerals 260 has intersected 1.1m at 290g/t gold within the Bullabulling gold project, 25km south‑west of Coolgardie in Western Australia, with grade control drilling also returning multiple high‑grade intervals. The company says these results support confidence in the existing 6.2Moz mineral resource, derived from ongoing infill, grade control and extensional drilling across the deposit. For mine planning and geotechnical design, the tighter drill spacing and confirmed high‑grade zones should refine pit shells, scheduling and cut‑off grade assumptions.
Technical Brief
- Mineralisation is being constrained using a combination of infill, grade control and extensional drilling datasets.
- Grade control drilling density will allow more reliable local kriging and short‑range continuity modelling of high‑grade shoots.
- Extensional drilling informs potential pushback designs and staged pit expansions beyond current resource shells.
- Infill drilling reduces classification uncertainty between Indicated and Inferred blocks, tightening geotechnical and economic assumptions.
- High‑grade intervals at metre‑scale thicknesses are critical for blast movement modelling and selective mining unit design.
- Concentrated high‑grade zones may justify narrower flitch heights and tighter dig lines to minimise dilution.
- Similar open‑pit gold operations have used such dense drilling to refine slope design sectors and ramp layouts.
Our Take
Across several Bullabulling pieces in our database, including the 2025-12-15 and 2026-03-29 drilling updates, Minerals 260 has been progressively reporting higher-grade zones, suggesting the current 6.2‑million‑ounce resource may be increasingly underpinned by a higher-grade core rather than just bulk tonnage.
The 2026-08-03 article noting a late‑2028 first‑gold target at Bullabulling means intercepts of ~290 g/t over short lengths are likely to be evaluated less as standalone ore blocks and more as potential sweeteners to lift early pit head grades and shorten project payback.
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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