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    Newmont’s Cadia 4.5 quake: geotechnical and continuity lessons for mine teams

    April 17, 2026|

    Reviewed by Joe Ashwell

    Newmont’s Cadia 4.5 quake: geotechnical and continuity lessons for mine teams

    First reported on Australian Mining

    30 Second Briefing

    Newmont is steadily ramping up processing operations at the Cadia gold mine in New South Wales after a magnitude-4.5 earthquake on Tuesday, with inspections so far indicating no material impact to underground workings or surface infrastructure. Geotechnical and structural assessments are ongoing across key assets including the tailings storage facilities, process plant foundations and underground openings. The event will interest operators of deep and seismically sensitive mines reviewing ground support design, real-time seismic monitoring and business-continuity planning for moderate local seismicity.

    Technical Brief

    • For deep and high-throughput mining operations, similar moderate events are increasingly used to validate monitoring and support strategies.

    Our Take

    Earlier coverage on 15 April shows Newmont fully suspending underground work at Cadia after the same magnitude‑4.5 event, so a ramp‑up now suggests geotechnical inspections have likely cleared key ground support and infrastructure for at least partial re‑entry.

    Cadia’s role as a major gold–copper producer in New South Wales, highlighted in our database alongside Newmont’s Nevada Gold Mines JV, means even short safety-driven stoppages can have noticeable impacts on Newmont’s aggregate gold output profile in current volatile price conditions.

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    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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