Cedric Bore. Annual reports plus final report to licence expiry/full surrender, for the period 2/4/2002 to 17/6/2008.
Published: 16 Sep 1908 Created: 12 Nov 2024 Revised: 12 Nov 2024

An area centred ~ 80 km north of Tarcoola was taken under licence to explore for possible economic buried precious and base metallic mineralisation hosted by Archaean and Proterozoic basement rocks. The area was selected on the basis of it having...

An area centred ~ 80 km north of Tarcoola was taken under licence to explore for possible economic buried precious and base metallic mineralisation hosted by Archaean and Proterozoic basement rocks. The area was selected on the basis of it having aeromagnetic relief thought to be comparable to that of the Prominent Hill area, in a region of regional north-west and north-east trending structural intersections. Known gold mineralisation occurs to the south-west of the licence area in association with the “Malbooma Anorthosite” complex, the emplacement of which is considered to be associated with the Hiltaba Suite / Gawler Range Volcanics magmatic and hydrothermal event. During the first licence year, activities comprised the acquisition in May-June 2002 of regional and infill gravity surveys totalling 752 stations, plus a ground magnetic survey and an IP survey, this work being funded by MIM under an option agreement it had made with the licensee. The regional gravity data was read over an 800 m x 800 m regular 'floating' grid covering the entire licence area; this was later infilled by 100 m spaced stations along 13 selected lines to profile five anomalies of interest. A total of 752 stations were read. The ground magnetic survey entailed making readings at 10 m intervals along the gravity infill lines during July 2002. The 17.2 line km of IP coverage comprised 100 m dipole-dipole spreads recorded by a contractor along seven selected north-south infill lines to the gravity grid. It was concluded that the detailed ground gravity survey had delineated a number of local gravity features of varying magnitude that have varying coincidence with aeromagnetic anomalies. This complex relationship between magnetite, as indicated in aeromagnetic data, and hematite, as indicated in the gravity data, was thought by the partners to be similar to what is observed at Prominent Hill, and the more intense geophysical anomalies were considered to be high priority targets for iron oxide - associated copper-gold (IOCG) style mineralisation. It was decided that areas of coincident gravity/magnetic anomalism should be evaluated by calcrete geochemistry to assist in the prioritisation of drill tests sites. Therefore relevant historic calcrete geochemical data for the licence area (727 samples on record) was compiled and reviewed. Results for gold showed low order, highly chaotic anomalism, that may be related to detrital reworking within the Cretaceous Algebuckina Sandstone subcrop. The results of the IP survey traverses proved inconclusive, possibly due to very thick, conductive cover sequences masking the bedrock responses. Interpretation of the gravity and the DTM data indicated the presence of a large ?Tertiary palaeochannel crossing the licence in an east-west arc, which could have sedimentary uranium prospectivity. During licence Year 2, a small amount of infill calcrete sampling was done over an existing gold anomaly located in the south of the licence area, which coincides with a geophysical target. 43 samples were collected by Euro Exploration during November 2003 and assayed to check the tenor and repeatability of the previous anomaly, and they confirmed its validity. Some trial Enzyme Leach soil geochemical sampling of the minus 60 mesh soil particle size fraction was earlier carried out by MIM along selected grid lines covering gravity targets. Its results were unremarkable. Although a number of still untested geophysical anomalies had been defined, MIM considered that they did not satisfy its corporate objectives, and hence decided not to drill test them, withdrawing from the option agreement in late 2003 after spending $115,850. During licence Year 3, no field work took place. Activity was confined to a data compilation and its presentations to prospective JV partners. An option agreement with Stellar Resources Ltd (Stellar) was agreed upon late in the licence year. During licence Year 4, Stellar undertook exploratory RAB bedrock drilling over four potential IOCG target features, completing 28 vertical open holes for a total penetration of 1358 m. Later, an additional four vertical aircore open holes for 250 m were completed to test a broad gravity low for the presence of buried palaeochannel sediments, and to look in them for signs of any contained gold or uranium mineralisation. The results of the drilling were disappointing, and Stellar elected not to continue to exercise its option to enter a joint venture. Crystalline basement was reached in all of the RAB holes, generally between 40 and 80 m below the surface. The basement lithologies are predominantly granite/granite gneiss, with limited occurrences of metasediments (quartzites) and volcanic rock. But the geochemical sample assay results for precious and base metals in these rocks were of low order, and did not reveal any signs of IOCG type alteration mineralogy. The single traverse of aircore holes defined a broad clay-filled “channel” feature, with a zone of sandstone/quartzite being intersected in the base of holes CBP02, 03 and 04. Whilst the age of this quartzite is not yet known, the clay thicknesses suggest that the wider gravity low response is reflecting a true palaeodrainage depositional feature, and it is possible that these “quartzites” represent channel fill sandstones. However, the analysis of selected 2-metre drill cuttings intervals for gold and uranium did not detect any significant anomalies. During licence Year 5, no field work was done. A transfer of licence ownership to Chesser Resources was accompanied by an office-based study of past exploration data. It was though that the limited drilling so far had not adequately assessed the geophysical targets nor the extent of, and depth of fill in, the likely palaeochannel. During licence Year 6, a prospectivity report was prepared by consultants to aid the new licensee in the design of an exploration programme to be undertaken in the following year. But due to unforeseen budget constraints arising out of the Global Financial Crisis, Chesser Resources had to revise its corporate priorities, and a decision was made to allow tenure to lapse.

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About this record

Record No mesac25364
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Search Geophysics Pty Ltd;MIM Exploration Pty Ltd
Sponsor Mount Isa Mines Limited
Tenement
Tenement Holder Hiltaba Gold Pty Ltd;Mount Isa Mines Limited;Stellar Resources Ltd;Chesser Resources Ltd
Operator Vintage Exploration and Mining Pty Ltd;Mount Isa Mines Limited;Chesser Resources Ltd
Geological Province
Mine Name
Stratigraphy
Commodity
Notes
Notes: Includes:   - Law, S.R., October 2002. Report on a trial Enzyme Leach [soil geochemical] survey conducted during August 2002 at the Cedric Bore prospect (MIM Exploration report for Vintage Mining and Exploration). Appendix A of EL 2911...

Notes: Includes: - Law, S.R., October 2002. Report on a trial Enzyme Leach [soil geochemical] survey conducted during August 2002 at the Cedric Bore prospect (MIM Exploration report for Vintage Mining and Exploration). Appendix A of EL 2911 second annual report to 1/4/2004. 39 pages, 1 plan, 2 appx, 24 fig. Geographic Locality: Commonwealth Hill Station;Bulgunnia Station;Woomera Prohibited Area;2002 Cedric Bore Gravity Survey;2002 Cedric Bore DDIP Survey;2002 Cedric Bore Ground Magnetic Survey Doc No: Env 10380 Drillhole: Cedric bore;CB001 - CB028;(219397 - 219424);CBP01 - CBP04;(219425 - 219428)

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Language English
Metadata Standard ISO 19115-3

Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac25364
Citation Anderson, C.G.;Law, S.R.;Gordon, M.;Coppin, T. 1908. Cedric Bore. Annual reports plus final report to licence expiry/full surrender, for the period 2/4/2002 to 17/6/2008. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac25364

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[134,-30.5],[135,-30.5],[135,-29.5],[134,-29.5],[134,-30.5]]]}
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