New Murchison’s Crown Prince hit: underground mine design notes for engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
New Murchison Gold has hit its highest-grade 1m RC sample to date at the Garden Gully Gold Project in WA, with drilling at the Crown Prince open pit returning 2,860g/t gold from hole CPRC030. The same hole intersected 14m at 231.67g/t, including 4m at 805.2g/t, confirming an exceptionally high-grade shoot beneath existing workings. Results materially upgrade the underground potential at Crown Prince, likely shifting focus towards deeper resource definition drilling and underground mine design scenarios.
Technical Brief
- Reverse circulation method allows relatively low-cost, rapid follow-up drilling on the emerging high-grade zone.
- Metallurgical testwork on such coarse, nuggety mineralisation will be critical for recovery and dilution assumptions.
Our Take
New Murchison Gold’s latest Crown Prince hit sits alongside recent high‑grade results at Cloudkicker and Lydia in Western Australia, suggesting the company is progressively building a multi‑source ore pipeline around the Garden Gully Gold Project rather than relying on a single pit or lode.
The combination of ultra‑high‑grade RC intersections at the Crown Prince open pit and earlier grade‑control drilling at Cloudkicker indicates New Murchison Gold may be able to selectively mine very high‑margin stopes, which typically supports faster payback and resilience to gold price volatility.
Within our Mining–Projects coverage, there are many gold stories but relatively few with metre‑scale grades above 200g/t; this places Garden Gully’s Crown Prince results in the extreme high‑grade tail of current Australian gold project reporting and will likely sharpen investor focus on underground expansion potential.
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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