Corunna. Progress and final reports for the period 22/7/91 to 21/7/92.

Created: 13 Nov 2024 Revised: 13 Nov 2024

Author: Rava, B.F.;Purvis, A.C.;Dean, J.A.

TARGET: Broken Hill or Aggeneys - Gamsberg type stratiform base metal deposits within the metamorphosed Palaeoproterozoic Hutchison Group chemical sediments in the Corunna area, possibly hosted by geochemically anomalous carbonate and silicate facies banded iron formation lithologies, which in the subsurface may be related to strong aeromagnetic trends extending away from the known Triumph prospect. Shell had previously obtained near-target lead isotope signatures on anomalous BIF samples. EXPLORATION: Rock-chip sampling, Pb isotopic determinations on surface samples containing visible galena (max 2.88% Pb) and chalcopyrite (max 0.67% Cu), and RAB drilling along 3 lines to identify/sample shallow bedrock (52 holes totalling 1610 m). RESULTS: The drilling downgraded anomalous zones. Mineralisation appears to be related to emplacement of the Burkitt Granite and is characterised by highly radiogenic 207/204 and 208/204 Pb isotope ratios. Intact prospective Hutchison Group sequences are now thought unlikely to exist in the area, due to widespread faulting and granitisation. Locally abundant magnetite near the sheared margins of the granite explains the linear aeromagnetic signatures seen.

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About this record

Record No	mesac32835
Topic	Geoscientific Information
Type of Resource	Document
Category Type	Basement Geology Biological Sciences Drilling Engineering Earth Sciences Ecology Engineering Exploration Geochemistry Geochemistry Geochronology Geology Geomatic Engineering Geophysics Historical Geology Igneous And Metamorphic Petrology Isotope Geochemistry Magnetics Mineral Exploration Mineral Resource Geology Mineral Resources (Excl. Energy Resources) Mineral System Geology Petrology Policy And Administration Regional Geology Resource Geology Resources Engineering Sedimentology Stratigraphy Surface Geology
Document Type	Mineral Company Report - Mineral Exploration
Contributor	Pontifex and Associates Pty Ltd;CSIRO. Div. of Exploration Geoscience
Sponsor	Aberfoyle Resources Ltd
Tenement	EL 1735
Tenement Holder	Aberfoyle Resources Ltd
Operator
Geological Province	Gawler Craton
Mine Name	South West Triumph prospect;South Triumph prospect
Stratigraphy	Burkitt Granite Hutchison Group
Commodity	granite iron lead
Notes	Notes: Includes: - Dean, J.A., 25/10/91. Report on the Pb isotopic compositions of samples from the Triumph prospect (Harris Bluff), Eyre Peninsula, SA (Sirotope consultant's report for Aberfoyle). Appx 4 of EL 1735 first quarterly report to... Notes: Includes: - Dean, J.A., 25/10/91. Report on the Pb isotopic compositions of samples from the Triumph prospect (Harris Bluff), Eyre Peninsula, SA (Sirotope consultant's report for Aberfoyle). Appx 4 of EL 1735 first quarterly report to 22/10/91. 2 fig, 5 ref, 1 table. Geographic Locality: North-eastern Eyre Peninsula;Corunna;Iron Knob;Cooyerdoo Station Doc No: Env 08520 More +
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/mesac32835
Citation	Rava, B.F.;Purvis, A.C.;Dean, J.A. Corunna. Progress and final reports for the period 22/7/91 to 21/7/92. Mineral Company Report - Mineral Exploration https://pid.sarig.sa.gov.au/document/mesac32835

Technical information

Status
Maintenance and Update Frequency
Geographic Reference	GDA2020 (EPSG:7844)
Geo bounding box	{"type":"Polygon","coordinates":[[[137,-33],[137.5,-33],[137.5,-32.5],[137,-32.5],[137,-33]]]}
Purpose
Lineage