During ongoing exploration for Mount Gunson style economic base metal mineralisation buried on the south-central Stuart Shelf, new work completed by CSR has included the drilling of 59 rotary percussion holes totalling 3782 m in the Winnie Pinnie,...
During ongoing exploration for Mount Gunson style economic base metal mineralisation buried on the south-central Stuart Shelf, new work completed by CSR has included the drilling of 59 rotary percussion holes totalling 3782 m in the Winnie Pinnie, Lake Dutton and Bookaloo areas, conducting detailed geological logging of 8 recently drilled diamond drillhole cores, making an interpretation of the 1975 Geoterrex Ltd Stuart Shelf Aerial Magnetic Survey, for comparing estimated depths to magnetic dykes with known depths to Pandurra Formation, plus performing a detailed petrological study, a LANDSAT lineament study of the TORRENS mapsheet, and stratigraphic interpretation and correlation of downhole geophysical logs. A suite of 1:50,000 scale maps were compiled showing available aeromagnetic data, structure contours (pre- and post-Tapley Hill Formation erosion surfaces), isopachs (of the Yudnapinna Beds, Tapley Hill Formation and Whyalla Sandstone), interpretive bedrock lithology, and drillhole locations. A newly defined basaltic stratigraphic unit, the Beda Volcanics, which appears to be temporally and spatially distinct from the Roopena Volcanics, was recognised from CSR drillhole samples taken in the post-Pandurra depositional sequence: its characteristics and rock relationships have been published separately [see Geological Survey of South Australia, Quarterly Geological Notes, 66, p. 2-9].
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