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Murray Basin Section 15 expiry 31 August: Ground release with accompanying geoscientific data
On Tuesday, 1 September 2020, the Department for Energy and Mining will lift part of the Section 15, opening up parts of the Delamerian Orogen and Murray Basin to exploration licence applications.
The Geological Survey of South Australia will also publish a Phase 1 data release of new geoscientific information on the region.
Phase 1 – data release
A region encompassing the western Murray Basin was gazetted under section 15 of the Mining Act 1971 on 22 July 2019. This enabled the Geological Survey of South Australia (GSSA) and collaborative research partners to undertake a geological review and data audit of the Delamerian basement in this region. Two areas of interest have been identified for precompetitive geoscience activities, including a planned NDI drilling program. The remaining ground not retained after Phase 1 is open for exploration licence applications.
Delamerian Basement to the Murray Basin – Atlas of geoscientific and exploration data
This Atlas provides a pictorial summary of some of the geological and exploration data available for the Murray Basin region, including land access, current and previous exploration, mineral deposits and occurrences, surface and basement geology, drill hole and rock sample geochemistry, HyLogger data, constraints on depth to crystalline basement, potential field geophysics and magnetotellurics.
Interpreted basement geology to the Murray Basin and surrounds
This geological framework provides an initial interpretation of the distribution of major structures, magmatic phases and volcano-sedimentary packages of the Delamerian Orogen.
Delamerian igneous basement to the Murray Basin in South Australia: a drill core review - volume 1
Results of a logging project of a selection of exploration and stratigraphic holes that intersect Delamerian igneous and volcano-sedimentary basement to the Murray Basin:
- 90 cored holes were re-logged, totalling almost 5,000 m in length
- supported by examination of 260 thin sections
- graphic lithological logs accompanied by descriptions of the main lithologies, their contact relationships, deformational fabrics, and alteration facies.
Extensive mineral exploration data updates
A comprehensive review of legacy data across the region and surrounding areas has led to the upload of extensive new data resources. The new data available in SARIG includes surface geochemistry, drill hole locations, lithology logs and downhole geochemistry.
Hyperspectral dataset update - 48 new HyLogged drillholes
42 drill holes from the Sherlock Cu-Pb-Zn prospect and 6 drill holes from the Anabama Cu-Mo prospect have been scanned using HyLogger 3-3, in order to characterise primary and alteration mineralogy. This totals over 4300 m of new spectral data, complementing previously available HyLogger data in the Delamerian region.
Preliminary results have focused on the change in SWIR white mica and chlorite species and TIR feldspars in drill samples from the Anabamma Granite. While there are a greater variety of lithological and mineral interactions at the Sherlock Prospect, these results are yet to be analysed. All the spectral data is currently available for download via SARIG.
Delamerian cover thickness and magnetic source depth modelling
This package is a collection of datasets that portray actual or inferred depth to crystalline basement based on the Stratigraphic logs for over 2,000 drillholes.
In addition, the depths to the top of magnetic sources have been determined over eleven airborne total magnetic intensity (TMI) surveys covering parts of the Delamerian Orogeny in South Australia. All calculations were completed using the magnetic inversion tool contained within ModelVision using the “sweet-spot” traverse inversion depth-estimation technique.
Delamerian AusLAMP resistivity model
The first 3D electrical resistivity model to image the entire Curnamona Province and most of the onshore extent of the Delamerian Orogen crosses the geographical state borders between South Australia, New South Wales and Victoria. Signatures from past tectono-thermal events can be retained in the lithosphere for hundreds of millions of years. Magnetotelluric (MT) methods image the deposited conductive mineralogy as electrically conductive pathways. MT also images regions of different bulk conductivity and can help to understand the continuation of crustal domains down into the mantle, and address questions on the tectonic evolution of Australia.
Reprocessed Delamerian geophysical images
The best available gravity and magnetic data from South Australia, New South Wales and Victoria have been merged into continuous datasets over the Delamerian region, to facilitate geological interpretation, modelling and analysis. A range of transformations have been applied to the merged datasets to expand the range of analyses that can be performed.
Phase 2 – research and scientific drilling
Stemming from the review, data compilation and release in Phase 1, two geographic regions have been selected to focus geoscientific research programs as well as the Delamerian NDI drilling campaign, in conjunction with the MinEx CRC. The Quondong Vale and Alawoona regions provide a cross-section of geological and geophysical domains within the basement to the Murray Basin. Future work in these regions will provide valuable knowledge on the Delamerian Orogen and its mineral potential.