Newmont Cadia quake pause: seismic design and safety lessons for cave mines
Reviewed by Tom Sullivan
First reported on Australian Mining
30 Second Briefing
Newmont has suspended underground operations at the Cadia gold mine near Orange, New South Wales, after a magnitude-4.5 earthquake struck west of the site overnight, triggering geotechnical inspections. The company is assessing ground support, backs and pillars in the panel cave and other underground workings before allowing personnel re-entry, while surface processing and other non-underground activities reportedly remain largely unaffected. The event will focus attention on seismic design criteria, rock mass characterisation and monitoring systems for deep block and panel cave operations in intraplate seismic regions.
Technical Brief
- Geotechnical inspections will focus on damage mapping of backs, abutments and pillars for shear, spalling and buckling.
- Expect re‑assessment of dynamic load factors on cable bolts, shotcrete arches and mesh in high-stress panels.
- Seismic monitoring data (event location, frequency, energy release) will be back-analysed to distinguish tectonic vs mining-induced response.
- Short-term remediation options include additional spot bolting, mesh re-tensioning and shotcrete patching in damaged headings.
- Ongoing monitoring will probably rely on increased microseismic sensitivity, convergence measurements and more frequent visual inspections.
- Similar deep cave operations in intraplate settings may need to revisit design spectra and dynamic rock mass characterisation.
Our Take
Newmont features repeatedly in our recent coverage of top-tier gold producers and market volatility, so a safety-driven halt at Cadia in NSW will be watched closely by investors already sensitised to operational risk at major gold portfolios.
The 4.5-magnitude event at Cadia comes as Newmont is simultaneously highlighted in our database for large-scale Nevada operations with Barrick, underscoring that its risk management systems must span both high-seismicity jurisdictions like parts of Australia and lower-seismicity but high-production US districts.
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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