Warana Hill - Areas 1-3. Joint annual reports to licences' joint expiry/full surrender, for the period 30/6/2009 to 29/6/2011.
Created: 12 Nov 2024 Revised: 12 Nov 2024

A conjoined multi-licence area located in the northern Strzelecki Desert, centred approximately 110 km north-northwest of Moomba, has been explored for possible economic buried Cenozoic heavy minerals sands (HMS) deposits, and also for shallow...

A conjoined multi-licence area located in the northern Strzelecki Desert, centred approximately 110 km north-northwest of Moomba, has been explored for possible economic buried Cenozoic heavy minerals sands (HMS) deposits, and also for shallow sediment-hosted secondary uranium deposits. Unusually wet weather in south-western Queensland during late 2009 caused riverine flooding events along the lower reaches of the Cooper Creek and its tributaries, which effectively prevented the licensee from conducting on-ground field work over the ensuing 18 months. Available regional airborne geophysical survey data, and other public domain remote sensing data, was used in office-based work done by a consultant to the licensee to assess the potential of the area for having occurrences of the target commodities. Image processing, filtering and spatial correlation of aeromagnetic data displayed in various modes led the consultant to choose the first vertical derivative (1VD) mode as the best magnetic data image for depicting subtle shallow geological features. However, after taking into consideration the depositional history of the area, he concluded that prolonged weathering and oxidation of the exposed upper surface of the target Tertiary Eyre Formation, now concealed beneath an unconformity with overlying transported cover sediments, may have caused the observed low amplitude linear magnetic anomalies, rather than them representing ilmenite mineral grain concentrations present within near-surface accumulations of HMS. A separate examination of the airborne radiometric survey data, imaged as total count, potassium, thorium and uranium gamma ray spectral maps, did not reveal any significant uranium anomalism, nor any thorium radiometric anomalies which would be associated with substantial amounts of monazite if that mineral is present in HMS accumulations. Therefore the consultant believed that no strong evidence exists for the presence of HMS within the area of the subject licences, or of factors in the geological environment that would lead to concentration of heavy minerals. During the second year of tenure, the geophysical consultant conducted an evaluation of the applicability of airborne EM surveys to exploration of the subject area for possible roll front style sedimentary uranium deposits. The recently completed 2010 Frome Embayment regional TEMPEST airborne electromagnetic (AEM) survey flown by Fugro Airborne on behalf of PIRSA and Geoscience Australia, for which data had been newly released into the public domain, provided a timely and relevant yardstick for gauging utility of the method, as it had traversed a geological environment similar to that of the subject licence area, which includes Recent sediments of the southern Strzelecki Desert and also the underlying Eyre Formation sediments. The final processed AEM data for the Frome Embayment Survey were obtained, and for 11 long east-west flight lines from the far northern end of the survey coverage, the electrical conductivity measurements for the depth interval 0-60 m were studied. Three dimensional plots of the linear conductivity depth images were interpreted in conjunction with Landsat and digital terrain model images which provided proxies for the surface geology and geomorphology. The evaluation indicated that the method is likely to be of marginal value to exploring for uranium in the northern Strzelecki Desert, as the region is covered with salt pans and sand dunes, and the porous horizons in this shallow cover are expected to be saturated by electrically conductive saline groundwater. These highly conductive strata would undoubtedly prevent deep penetration of the electromagnetic signal, and thus would mask a response from deeper geological contrasts. In places where the target Eyre Formation outcrops, its sediments may exhibit adequate AEM signal contrast, but their probable deep weathering may also make them too conductive to permit resolution of the required deeper EM responses. It was thought that, while there could be some benefit gained from flying an airborne TEMPEST survey at Warana Hill, the high cost of covering the licence areas at a suitable line spacing would likely be less effective than performing a systematic drilling programme on the same budget. The recent success story publicised by Uranium Equities, of finding sedimentary uranium mineralisation at the southern end of the Strzelecki Desert, suggested that perhaps ground electromagnetic surveying might offer more value than doing an airborne survey. However, because limited information is currently available on the subsurface geological environment at Warana Hill, it was recommended that an initial drilling programme would be more likely to provide useful information about uranium prospectivity. A subsequent ground electromagnetic survey could help extend the resulting geological knowledge at a lower cost. Downhole geophysical and geological log data from petroleum exploration wells located in the northern Strzelecki Desert region were obtained and reviewed, but did not provide any direct evidence for the occurrence of uranium mineralisation within the shallow part of the Cenozoic sedimentary sequence there (<200 m deep). The licensee failed to renew the subject licences for a third year, and so tenure of the ground herein reported was surrendered by default.

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About this record

Record No mesac24901
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Australian Geological Survey Organisation (AGSO);Near Surface Commodities Pty Ltd
Sponsor SA Beach Sands Pty Ltd
Tenement
Tenement Holder SA Beach Sands Pty Ltd
Operator
Geological Province Lake Eyre Basin
Mine Name
Stratigraphy
Commodity
Notes
Notes: 1997 aeromag/rad survey has Commonwealth Government geophysical survey code P675.
Geographic Locality: Northern Strzelecki Desert;Warana Hill;Cooper Creek Floodplain;Deparanie Waterhole;1997 AGSO STRZELECKI-INNAMINKA Aerial Magnetic...

Notes: 1997 aeromag/rad survey has Commonwealth Government geophysical survey code P675. Geographic Locality: Northern Strzelecki Desert;Warana Hill;Cooper Creek Floodplain;Deparanie Waterhole;1997 AGSO STRZELECKI-INNAMINKA Aerial Magnetic Survey;1997 AGSO STRZELECKI-INNAMINKA Aerial Radioactivity Survey;2010 Frome Embayment Aerial EM Survey Doc No: Env 12069

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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/mesac24901
Citation Pratt, D.A. Warana Hill - Areas 1-3. Joint annual reports to licences' joint expiry/full surrender, for the period 30/6/2009 to 29/6/2011. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac24901

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[139,-27.5],[140,-27.5],[140,-26.5],[139,-26.5],[139,-27.5]]]}
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