mineral exploration
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The Stavely Project is a collaboration between Geoscience Australia and the Geological Survey of Victoria. During 2014 fourteen pre-competitive stratigraphic drill holes were completed in the prospective Stavely region in western Victoria in order to better understand subsurface geology and its potential for a variety of mineral systems. The Stavely region hosts several belts of poorly-exposed Cambrian volcanic and intrusive rocks, visible largely only in magnetic data, which have similarities to those found in modern subduction-related tectonic settings. Mineralisation associated with porphyry Cu-Au and volcanic-hosted massive sulphide mineral systems is known where these rocks are exposed around Mount Stavely and the Black Range. However, despite a history of mineral exploration dating back to the late 1960s, significant economic deposits are yet to be discovered, and the Stavely region remains a greenfields terrane. Given the geological setting and known mineral potential, opportunity exists for the discovery of large mineral systems beneath extensive, but relatively thin, younger cover. The Stavely Project aims to provide the framework for discovery in the Stavely region primarily through the acquisition and delivery of pre-competitive geoscientific data. This includes the completion of pre-competitive stratigraphic drill holes in order to test regional geological interpretations and recover material for detailed lithological, petrophysical, geochemical and geochronological analysis. The results will assist in understanding the mineral systems potential of the Stavely region under cover. This report summarises data collected in the field at the drill sites, either during or immediately following drilling, as part of the Stavely Project, and describes the methods and procedures used. Data presented in this release include drill hole collar information, operational metadata and daily drilling reports, drill core photographs, down-hole surveys, down-hole wireline geophysical logging results, down-hole temperature logging results, down-hole AutoSondeTM gamma data, Lab-at-RigTM X-ray fluorescence data, diamond drill core recovery percentages, and handheld magnetic susceptibility measurements on the drill core.
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Abstract
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Legacy product - no abstract available
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Legacy product - no abstract available
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A key question to ask of an ore deposit is why it is there (as opposed to somewhere else). The architecture of a deposit, camp or region is the product of the geodynamic processes that provided the pathways, drivers, sources(?) and depositional mechanisms. The "Golden Corridor" is a ~500 km long regional buried upper-crustal antiform that extends from Norseman to Wiluna. It hosts the world-class camps of Kambalda, Kalgoorlie, Leonora and Wiluna. The antiformal architecture, with "nested" domes, provided an efficient fluid focussing mechanism. Fault breaching of these domes at depth delivered highly focussed crustal and deep-sourced fluids to the sites of deposition. Understanding the architecture of the "Golden Corridor" and related domes answers us a large part of the question "why is it there".
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This report deals with the application of geophysical methods (other than radiometric) to the Coronation Hill Radioactive Deposit. Results of radiometric gridding of the surface and costeans, field sludge assays, and radiometric drill hole logging are not treated as these are included in entirety in R.B. Allen's report "The Coronation Hill Uranium Prospect," Bureau of Mineral Resources Record 1954/17. Structural indications from magnetic evidence are discussed. These comprise several faults, or zones of weakness, one of which may coincide with the axis of the surface radio-activity. Several interesting magnetic features for which no cause can be proposed are also noted. The highly uncertain nature of the deductions made is emphasised. The method of approach to geophysical applications at Coronation Hill is detailed, and recommendations are made for possible future work.
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This map is one of a set of three that shows the location of exploration lease 1348 in relation to the Kokoda Track in Papua New Guinea.
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Legacy product - no abstract available
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This prospect, which is situated near the headwaters of the South Alligator River on a bearing of 109 degrees and about 24 miles distant from Goodparla Homestead, was discovered by Geologist, B. P. Walpole, on 2nd June, 1953. Following its discovery detailed geological and geophysical investigations were undertaken as well as costeaning and diamond drilling. [A summary of the information concerning the prospect available at 31st October 1953 is given below].
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The National Geochemical Survey of Australia (NGSA) project was launched in 2007 as part of the Australian Government's Energy Security Initiative. Knowledge of the concentrations and distributions of chemical elements in the near-surface environment, used in combination with other datasets, can contribute to making exploration for energy and mineral resources more cost-effective and less risky. As a spin-off, the multi-element dataset can also have applications in environmental fields. During precursor pilot projects, various sampling media, grain-size fractions and analytical methods were tested. It emerged that catchment outlet sediments (from either overbank or floodplain landforms, or from similar low-lying settings) were an ideal sampling medium found across Australia. These sediments are well-mixed composites of the dominant rock and soil types of a catchment, and are typically fine-grained. Results from the pilot projects indicated that catchment outlet sediments could reflect geochemical signatures from basement and mineralisation, even through thick transported overburden. Building on these methods, the NGSA project targeted catchment outlet sediments as a uniform sampling medium. A shallow (0-10 cm) and a deeper (~60-80 cm) sediment sample was collected at the outlet of 1186 catchments covering ~80% of the country. Sampling was carried out by State and Northern Territory geoscience agencies following protocols described in the Field Manual and practiced during in-field training with Geoscience Australia project staff. All sampling equipment (augers, shovels, etc.) and consumables (bags, labels, etc.) were provided centrally. Dry and moist Munsell colours, soil pH, digital photographs, site information and GPS coordinates were recorded in the field. .../...