Cowell nephrite deposit. Technical appraisal reports submitted during the period 1970 to 1988.

Published: 08 Dec 1980 Created: 12 Nov 2024 Revised: 12 Nov 2024

Author: Hopwood, T.P.;Coles, B.D.;Wilson, A.F.;Lai, T.R.;Jaeger, H.;Swain, M.V.

A consultant geologist's reports prepared in 1970 for by mining lease optionholder Murumba Minerals NL describe his detailed mapping of the then known jade (nephrite) deposits within the Cowell Jade Province. Two potentially mineable deposits were selected for appraisal diamond drilling. The 5 drillholes totalling 103 m put down into outcrop on Swain's Lease encountered no nephrite, while the single 24 m deep hole put down on Schiller's Lease made a 3 m thick intersection of black nephrite. Intermittent contract mining of this nephrite pod, to supply gem rough material to an onsite slabbing and polishing jade processing factory, was proposed. A regional search to identify other potentially mineable nephrite occurrences delineated Outcrop 33 near Minbrie Creek and Outcrops 55 and 56 near Minbinnie Creek. Results of additional outcrop geological mapping and further appraisal diamond drilling, subsequently performed in late 1973 on the Cowell jade deposits by mining lease optionholder Centamin NL, are provided, but without concluding comments.

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About this record

Record No	mesac32197
Topic	Geoscientific Information
Type of Resource	Document
Category Type	Civil Engineering Drilling Engineering Earth Sciences Energy Energy Exploration Engineering Geochemistry Geology Geomatic Engineering Geophysics Hydrogeology Mineral Exploration Mineral Resource Geology Mineral Resources (Excl. Energy Resources) Mineral System Geology Mineralogy And Crystallography Petrology Petrophysics Physical Geography Primary Mining And Extraction Of Mineral Resources Regional Geology Resource Geology Resources Engineering Stratigraphy
Document Type	Mineral Company Report - Mineral Exploration
Contributor	Centamin NL;CSIRO Div. of Materials Science and Technology
Sponsor	Murumba Minerals NL;Australian (Nephrite) Jade Mines Pty Ltd;Cowell Jade Pty Ltd
Tenement	MC 4827 MC 4926 ML 5308 ML 5332 ML 3426 MC 5304 MC 5305 SML 383 MC 108 MC 193 MC 194 MC 195 MC 196 ML 4338 ML 4339 ML 4340 ML 4341 ML 4381
Tenement Holder	H.A. Schiller;Murumba Minerals NL;Renshaw, N.B.;Spinifex Mining Co. Ltd;Analytical Exploration Australia Pty Ltd;Australian (Nephrite) Jade Mines Pty Ltd
Operator	Murumba Minerals NL;Centamin NL;Cowell Jade Pty Ltd
Geological Province	Cleve Subdomain Gawler Craton
Mine Name	Cowell jade deposit;Schiller's leases;Swain's lease;Griffin and Greening leases
Stratigraphy	Hutchison Group Lincoln Complex Warrow Quartzite
Commodity	gemstone jade
Notes	Notes: Includes: - Wilson, A.F., 8/12/1980. A gemmological assessment of the nephrite jade deposits near Cowell, South Australia (consultant gemmologist's report for Cowell Jade Pty Ltd) - indexed separately. - Lai, T.R., Jaeger, H. and Swain,... Notes: Includes: - Wilson, A.F., 8/12/1980. A gemmological assessment of the nephrite jade deposits near Cowell, South Australia (consultant gemmologist's report for Cowell Jade Pty Ltd) - indexed separately. - Lai, T.R., Jaeger, H. and Swain, M.V., CSIRO Div. of Materials Science and Technology, August 1988. Microstructure and mechanical properties of a tough natural fibrous ceramic, nephrite (jade). in: Part I of the Proceedings of the International Ceramic Conference, Sydney, Australia, 21-26 August 1988 [AUSTCERAM88]. Discusses experiments made to assess the fracture toughness, fracture strength in flexure, and hardness of two pieces of Australian jade obtained from Outcrops 32 and 69 of the Cowell jade deposit. See also related Env 3428. Geographic Locality: Central eastern Eyre Peninsula;Minbrie Ranges;Minbinnie Creek Doc No: Env 05209 Drillhole: Murumba Minerals' Cowell DDH1 - DDH6;Centamin' Cowell DDH7 - DDH13 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/mesac32197
Citation	Hopwood, T.P.;Coles, B.D.;Wilson, A.F.;Lai, T.R.;Jaeger, H.;Swain, M.V. 1980. Cowell nephrite deposit. Technical appraisal reports submitted during the period 1970 to 1988. Mineral Company Report - Mineral Exploration https://pid.sarig.sa.gov.au/document/mesac32197

Technical information

Status
Maintenance and Update Frequency
Geographic Reference	GDA2020 (EPSG:7844)
Geo bounding box	{"type":"Polygon","coordinates":[[[136.5,-34],[137,-34],[137,-33],[136.5,-33],[136.5,-34]]]}
Purpose
Lineage