Following a review of previous company exploration and image interpretation of SAEI and BMR aeromagnetic data, a 3166 line km airborne magnetic/radiometric survey, with follow-up ground magnetics and air core drilling (282 holes, 4559 m), was...
Following a review of previous company exploration and image interpretation of SAEI and BMR aeromagnetic data, a 3166 line km airborne magnetic/radiometric survey, with follow-up ground magnetics and air core drilling (282 holes, 4559 m), was carried out during base metal exploration of Palaeoproterozoic Hutchison Group metasedimentary rocks overlying Archaean to Early Proterozoic basement in the Green Patch area, north-west of Port Lincoln, seeking analogues to the recent Menninnie Dam base metal discovery. Some anomalous Cu-Pb-Zn cover rock geochemistry in proximity to ultramafic intrusives, and patchy Pb-Zn anomalies within carbonate and quartzite lithologies, were detected by drill sample assays. An inclined RC drillhole put down at the Rifle Range prospect targeted the base of the Warrow Quartzite, and returned peak assay values of 660 ppm Cu, 300 ppm Pb and 2900 ppm Zn from a goethitic redox zone intersected at 40-48 m depth: further Pb, Zn, Co and Ni anomalism in the underlying host ironstone facies below 54 m depth was more sporadic, although the full thickness of this target formation interval was not penetrated. No anomalous gold was reported from any of the drilling work.
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