Airborne electromagnetic (AEM) data are being acquired by Geoscience Australia (GA) under the Australian Government's Onshore Energy Security Program (OESP) in areas considered to have potential for uranium or thorium mineralisation. In contrast to deposit-scale investigations carried out by industry these surveys are designed to reveal new geological information at a regional scale. The Frome AEM survey shown in Figure 1 was flown by Fugro Airborne Surveys for GA, using the TEMPESTTM time-domain system. The survey was conducted with the aims of reducing exploration risk, stimulating exploration investment and enhancing prospectivity within the region primarily for uranium, but also for other commodities including copper, gold, silver, lead, zinc, iron ore and potable groundwater. The Frome AEM survey was primarily designed to be a regional mapping program for mapping surface and subsurface geological features that may be associated with sandstone-hosted uranium systems. The data are also capable of being interpreted for landscape evolution studies within the flanks of the tectonically active Curnamona Province and Flinders Ranges of South Australia. In this article we present an enhanced set of conductivity estimates which are now available from the GA website free of charge. These conductivity estimates reveal new geological information

The Pine Creek airborne electromagnetic (AEM) survey is the largest undertaken in the Northern Territory to date, covering an area of 74,000km squared (roughly the size of Tasmania). Funded by the Australian Government's Onshore Energy Security Program at Geoscience Australia the survey was flown over the Pine Creek Orogen and parts of the McArthur, Victoria River and Daly Basins in the Northern Territory during 2008 and 2009 to enhance exploration for uranium and other mineral systems. Flight lines spaced at 1666m and 5000m were flown over several uranium deposits, including Whites, Dyson, Ranger and Nabarlek, as well as uranium prospects, including Thunderball. The Pine Creek survey comprises three areas: Kombolgie, east of Kakadu National Park; Woolner Granite, near Darwin; and Rum Jungle west of Kakadu National Park. The TEMPEST fixed wing AEM system was used to acquire data in the Woolner Granite and Rum Jungle survey areas. The TEMPEST survey data were publicly released by Geoscience Australia in July and September 2009, respectively. The VTEM helicopter AEM system was used in the Kombolgie survey area and those data were publicly released by Geoscience Australia in December 2009. Nine companies contributed financially to fly detailed areas within the Geoscience Australia funded lines at closer line spacings. Many more industry partners provided important drill hole information, historical EM datasets and access to cased holes for essential conductivity logging. All company infill AEM data will be released to the public domain in December 2010.

STREAMED DATA THIS IS Streamed data and there are restrictions placed on this data: (a) Raw continuous time series data ("Streamed Data"), was supplied. (b) Streamed Data will not be distributed to any party other than Geoscience Australia or GA's Representative without the written permission of the Contractor. (c) Streamed Data will only be used for internal research and development purposes by Geoscience Australia or GA's Representative and results will not be published without the written permission of the Contractor. (d) The results of any such research and development shall be made available to the Contractor. (e) Streamed Data shall be delivered in the format specified in Attachment 9. (f) The Streamed data shall be accompanied by a header file containing a two-column table showing the file name and associated line number in Final Processed Data. This table shall also be included in the Final Report.

This report describes the geological and uranium energy implications of the Paterson airborne electromagnetic survey.

Release of the Cariewerloo Traverses of the Frome AEM Survey. These traverses were funded by the Department of Primary Industry and Resources South Australia (PIRSA).

The Natural Fields EM Forum was held in Brisbane, Queensland, Australia, on February 26, 2012, in conjunction with the ASEG 22nd International Geophysical Conference & Exhibition 2012. The forum was organised to review the current state of development of natural field EM methods (NFEM), being those methods that utilise the ambient electromagnetic field rather than deploying an additional active source as an element of a survey. NFEM methods are used to acquire data from which various parameters can be obtained to help interpret the electrical characteristics of the subsurface.

This professional opinion assesses the viability of utilising the priority aquifer target GWMAR1 to secure Broken Hill's water supply, both as an extractive only scheme and as a conjunctive use scheme employing Managed Aquifer Recharge as a key component. This work comes under the arrangements of the Broken Hill Managed Aquifer Recharge Project Phase 3a Memorandum of Understanding. The report addresses, with confidence levels, the following issues: Option 1: Groundwater Extraction Only. This includes an estimation of the water storage capacity and ambient groundwater salinity of the GWMAR1 priority target and the Jimargil sub-area. Different confidence levels are attached to these two estimates, reflecting the focus of work to date on the Jimargil sub-area. Broader groundwater quality issues will also be discussed. An assessment is also made of the issues with respect to direct groundwater extraction as the sole option for securing Broken Hill's water supply for a minimum of 3 years (approximately 30GL). Option 2 assesses the use of the GWMAR1 priority aquifer as part of a conjunctive water supply incorporating Managed Aquifer Recharge. This includes an assessment of the suitability of the priority MAR target at Jimargil based on the National MAR Risk Assessment Guidelines. The report also includes specification of the remaining information gaps and potential risks to a project to utilise the aquifer for (1) Groundwater extraction and (2) a conjunctive supply utilising Managed Aquifer Recharge. Broken Hill and Menindee. The report also includes a short summary of communities in Australia that currently rely on Managed Aquifer Recharge to supply their potable water, and management issues associated with this supply, and future considerations to a possible implementation phase of providing water security to Broken Hill and Menindee from a regional aquifer.

<p>This data package contains three airborne geophysical datasets processed from the Honeysuckle Creek Geophysical survey, Victoria, flown in 2001. The datasets are: a new Geoscience Australia layered earth inversion (GA-LEI) of the Honeysuckle Creek TEMPEST Airborne Electromagnetic (AEM) survey; an airborne magnetic, gamma-ray and elevation (MAGSPEC) survey; and an extract of the Australian National Gravity Database (GRAVITY). The additional processing and enhancement of the 2001 geophysical survey data has significantly improved previous conductivity predictions as well as enabling the extraction of geologically significant information to support salinity and natural resource management. <p>This metadata briefly describes the contents of the data package. The user guide included in the package contains more detailed information about the individual datasets and available technical reports. <p>The AEM dataset comprises the final Geoscience Australia layered earth inversion (GA-LEI) of the 2001 Honeysuckle Creek TEMPEST AEM survey, produced in 2008. The main data products from the GA-LEI inversion are: point located inversion output data; horizontal layer conductivity grids below ground surface; horizontal conductivity-depth slice grids of various regular depth intervals below ground surface; vertical conductivity-depth sections along each flight line; horizontal conductance distribution grids; a grid and images of conductance distribution; grids and images of interpreted bedrock topography and regolith thickness; and images of the above datasets produced using standard image enhancement techniques. The GA-LEI AEM data are derived from the 'Honeysuckle Creek TEMPEST AEM Survey, Victoria, 2001 Final Located Data (P903)', available as Geoscience Australia product number #65384. The GA-LEI has been demonstrated to generate more accurate conductivity predictions than other algorithms for similar TEMPEST surveys. <p>The MAGSPEC datasets are: airborne magnetic data comprising grids of total magnetic intensity (TMI), TMI reduced to pole (TMI-RTP), TMI-RTP first and second vertical derivative data and a range of enhanced magnetic images derived from the data; airborne gamma-ray data comprising grids of dose rate, concentration of potassium (K), thorium (Th) and uranium (U) and a range of enhanced gamma-ray images derived from the data; and elevation data comprising grids and images of the digital elevation model (DEM) derived from the MAGSPEC survey. <p>The GRAVITY dataset includes point located data, polygon location data, grids and enhanced images of data extracted from the Australian National Gravity Database. <p>The point located data are stored in ASCII files formatted with space-delimited columns with an associated comprehensive header file. The gridded data are stored in ER Mapper and ESRI grid formats as binary floating point raster grid files. The image data are stored in JPG format with associated world files. Polygon and other point location data are stored in ESRI shapefiles. Technical reports describing the data processing techniques are stored in Portable Document Format. <p>The survey was commissioned by the Murray-Darling Basin Commission in 2001. Fugro Airborne Surveys Pty Ltd was contracted to acquire and process the AEM survey utilising the TEMPEST time domain airborne electromagnetic system. Kevron Geophysics Pty Ltd was contracted to acquire and process the MAGSPEC survey utilising an industry standard system. The project was administered by the Australian Government Department of Agriculture, Fisheries and Forestry through the Bureau of Rural Sciences), now known as the Australian Bureau of Agricultural and Resource Economics and Sciences (ABARES). Geoscience Australia managed and quality controlled the work of Kevron and Fugro. Additional processing and enhancements of the 2001 airborne geophysics data was undertaken by GA in 2007-08, with funding from the National Action Plan for Salinity and Water Quality.

This publication is an outcome of a meeting entitled "Transient and Induced Variations in Aeromagnetics" that was held in Canberra on 18 September 1996 to discuss the effects of rapid fluctuations of the geomagnetic field on high-resolution aeromagnetic surveys and airborne detection systems. The meeting brought together people from the exploration and mining industry, Defence, Government Science, and Universities with common interests in the nature and applications of external magnetic fields and of the electromagnetic properties of the Earth's crust and oceans. Inevitably, much of the focus was on the use of base stations and tie lines for correcting for the influence of geomagnetic fluctuations in survey data. However, the discussion ranged widely from magnetospheric physics to the magnetic effects of ocean swells at aeromagnetic elevations.

Displays the coverage of publicly available digital airborne electomagnetic survey data. The map legend is coloured according to the line spacing of the survey.