A pilot passive seismic exploration survey was conducted at Great Cobar over a 2-day period using 100 seismic sensors deployed on the surface. Ambient seismic noise was used to characterise the sub-surface seismic velocities. The resulting tomographic maps show a high velocity body on the North West of the studied area that could be a marker for the bedrock. The 3D analysis shows a deep low velocity anomaly on the North East that is suggestive of old mine workings. The shallow low velocities on the south are likely related to the slag heap which would be thicker on the South West of the studied area. Some other velocity anomalies are apparent and in particular a high velocity zone to the North East and South West suggests a different rock unit.


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