Data release - as updated [made at SA Director of Mines' discretion] : Chinamans Hat Hill. Annual reports for the period 21/2/2011 to 20/2/2019.
Published: 27 Feb 1919 Created: 12 Nov 2024 Revised: 12 Nov 2024

An area of the Adelaide Fold Belt centred ~20 km east of Whyte Yarcowie is being explored for possible buried economic primary orogenic gold, as the cover sediments there are gold-bearing. Ground was taken up to cover a region of broad westwards...

An area of the Adelaide Fold Belt centred ~20 km east of Whyte Yarcowie is being explored for possible buried economic primary orogenic gold, as the cover sediments there are gold-bearing. Ground was taken up to cover a region of broad westwards (i.e dilational) fold flexure that could provide a focus for vein gold emplacement. Inferred prospective host strata include those of the Neoproterozoic Watervale Sandstone and Cox Sandstone. During the first licence year, office-based work consisted of devising an appropriate exploration methodology, including selecting the optimum sample grind size and assay route for achieving representative gold recovery. It was decided to use electrical geophysics to define drilling targets. 20 rock chip geochemical samples were collected from the Cox Sandstone exposures in the south-western corner of the licence area, and the minus 80 mesh crush size fractions, as a further 4-way sample split, were submitted for gold assaying both by cyanide leach digestion and by fire assay with an aqua regia finish. The highest gold value returned was 7.46 ppm Au from a sample of the central lode ferruginous boxwork located near the apex of the targeted fold flexure. During licence Year 2, in September-October 2012, the northern portion of a multi-licence, 774.5 line km airborne EM (RepTEM) survey was flown over the subject licence. Data were acquired along NE-SW flight lines spaced 100 m apart using a 30 m mean sensor elevation. The licensee was encouraged by the AEM data showing the interpreted presence of several conductive cross-cutting structures at depth within bedrock near the historic Wonna alluvial gold workings. During licence Year 3, 18 rock chip geochemical samples were collected for assaying, in part as a follow up to Archer's previous sampling of old workings and gold mineralised quartz veins. Some of the samples were taken from Watervale Sandstone outcrops to the east of the area previously sampled. During licence Year 4, no field work was done. Archer spent time spent reviewing historical newspaper reports from the late 1800s on gold mining in the Ketchowla district, to try to determine where exactly the Wonna hard rock mine exists. There is a Wonna alluvial goldfield, but perhaps not a source area reef mine as such, as the old working labelled on published maps as the Wonna is clearly not (since on these it is located too far away to the north near the Bismark and Golden Point). The more southerly workings that Archer is targeting are officially undocumented, although the mineralisation style present there should be the same as that described for the 'Wonna'. During licence Year 5, another 34 rock chip geochemical samples were collected for assaying from a variety of quartz veins at sites more widely dispersed within the licence area. Many elements in addition to gold were assayed for. A highest gold value of 8.88 ppm Au was obtained. During licence Years 6 and 7, no exploration work was done. During Year 7 regional geophysical EM data was reprocessed in the search for intrusions and therefore a source for mineralisation. During licence Year 8 exploration activities completed included additional rock chip sampling to explore for gold mineralisation. A total of 42 rock chip samples were collected and assayed for gold and a small multi-element suite. No additional gold mineralisation was identified along the ridge lines away from the known workings in the area. A review and the reprocessing of regional geophysical data was undertaken during the reporting period in the search for intrusions that could be the source of mineralisation.

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About this record

Record No mesac27857
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Geosolutions Pty Ltd
Sponsor Archer Exploration Limited
Tenement
Tenement Holder SA Exploration Pty Ltd
Operator Archer Exploration Limited
Geological Province
Mine Name Wonna alluvial gold workings
Stratigraphy
Commodity
Notes
Notes: This release to the public of the subject mineral exploration data, namely, company data which was acquired more than 5 years ago, is being done by DMITRE in accord with the provisions of Section 77D of the Mining Act 1971 and Regulation 88...

Notes: This release to the public of the subject mineral exploration data, namely, company data which was acquired more than 5 years ago, is being done by DMITRE in accord with the provisions of Section 77D of the Mining Act 1971 and Regulation 88 of the Mining Regulations 2011. Includes: - Beinke, L., Bourne, B. November 2018. Wonna Project EM Review. [Presentation]Terra Resources. Appx. 3 to annual report to 20th February 2019. Pg. 90-108. Geographic Locality: North-eastern Mount Lofty Ranges;Wonna Range;Chinamans Hat Hill;Ketchowla Creek;2012 North Burra Aerial EM (RepTEM) Survey [part];2012 North Burra Aerial Magnetic Survey [part] Doc No: Env 12258

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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/mesac27857
Citation Bollenhagen, W.J. 1919. Data release - as updated [made at SA Director of Mines' discretion] : Chinamans Hat Hill. Annual reports for the period 21/2/2011 to 20/2/2019. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac27857

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[139,-33.5],[139.5,-33.5],[139.5,-33],[139,-33],[139,-33.5]]]}
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