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- W2915676692 abstract "The St Ives terrain is covered by a thick regolith that is saturated with hyper-saline groundwater. The regolith forms a major barrier for electrical and EM surveys designed to detect gold bearing structures in bedrockThe DHMMR method was trialed at St Ives, and did not detect recognisable responses from known structures. DHMMR does not detect anomalies because the structures have small cross sectional areas for channelling current, and the resistive bedrock does not support large current densities for channelling into targets.DHEM surveys were trialed at St Ives and detected a strong well-defined anomaly at the Junction gold mine. The anomaly was modelled as a plate in layered earth, and the plate corresponded to a major gold bearing shear. Petrophysical tests suggest that the shear is conductive because of brine-saturated porosity.DHEM surveys did not detect strong anomalies from a gold bearing shear at the Argo gold mine, despite the shear having low measured resistivity relative to host rock. The absence of DHEM response may be because the shear is not conductive enough to support an anomalous current system, or because the conductivity is not connected on a large scale." @default.
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- W2915676692 date "2003-08-01" @default.
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- W2915676692 title "Direct Detection of Gold Bearing - DHEM vs DHMMR." @default.
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- W2915676692 doi "https://doi.org/10.1071/aseg2003ab167" @default.
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