East Isa Airborne Electromagnetic Survey, QLD, 2016 Contractor supplied data and conductivity models

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1 East Isa Airborne Electromagnetic Survey, QLD, 2016 Contractor supplied data and conductivity models Geoscience Australia & Geological Survey of Queensland, Versatile Time Domain Electromagnetic (VTEM TM Plus) data to define the distribution and thickness of cover sequences that obscure the basement geology and provide insight into the variation and characteristics of the overlaying sequences. D.J. McInnes Geoscience Australia ecatid

2 Department of Industry, Innovation and Science Minister for Resources and Northern Australia: Senator the Hon Matthew Canavan Assistant Minister for Industry, Innovation and Science: The Hon Craig Laundy MP Secretary: Ms Glenys Beauchamp PSM Geoscience Australia Acting Chief Executive Officer: Dr James Johnson This paper is published with the permission of the CEO, Geoscience Australia Geological Survey of Queensland Chief Government Geologist: Mr Tony Knight Commonwealth of Australia (Geoscience Australia) 2017 With the exception of the Commonwealth Coat of Arms and where otherwise noted, this product is provided under a Creative Commons Attribution 4.0 International Licence. ( Geoscience Australia has tried to make the information in this product as accurate as possible. However, it does not guarantee that the information is totally accurate or complete. Therefore, you should not solely rely on this information when making a commercial decision. Geoscience Australia is committed to providing web accessible content wherever possible. If you are having difficulties with accessing this document please clientservices@ga.gov.au. ecat Version: 1701

3 East Isa Airborne Electromagnetic Survey, QLD, 2016 Contractor supplied data and conductivity models The product consists of 15,697 line-kilometres of time-domain airborne electromagnetic (AEM) geophysical data acquired over part of East Isa in Queensland. Digital data includes electromagnetic and magnetic data, conductivity imaging products and multiplots for all flight traverses; as well as ancillary data including the transmitted waveform, the contractor-supplied logistics report and images of the Digital Elevation Model (DEM), the Total Magnetic Intensity (TMI) and depth slices of the conductivity transforms. The release data have been trimmed from that supplied by Geotech, to contain the final data fields of principal interest, enabling a more manageable data file size. The survey was funded by the Government of Queensland, with the principal objective of the survey to capture a new baseline geoscientific dataset and provide further information on the geological context and setting of the area for mineral systems: Thereby increasing the known prospectivity of a major regional frontier. This new regional AEM dataset will assist in defining the distribution and thickness of cover sequences that obscure the basement geology and provide insight into the variation and characteristics of these overlaying sequences. The survey data will provide valuable information regarding the Proterozoic basement geology and structure and may aid in the definition of the groundwater resource potential of the region. Geoscience Australia contracted Geotech Ltd. to carry out a helicopter-borne geophysical survey over part of East Isa in Queensland (Figure 1); GA Project # 1286, Geotech Project # UT The survey was undertaken from June 23 rd to November 4 th 2016 with operations based at Cloncurry, Queensland. The traverse lines were flown in an east-west direction with 2 km and 2.5 km traverse line spacing and 3 tie lines were flown perpendicular to the traverse lines. During the survey the helicopter maintained a mean altitude of 76 metres above the ground with an average survey speed of 90 km/hour. This ensured an average EM Transmitter-receiver loop terrain clearance of 38 metres and a magnetic sensor clearance of 68 metres. The principal geophysical sensors included a versatile time domain electromagnetic (VTEM TM Plus) full receiver-waveform system, and a caesium magnetometer. Ancillary equipment included a GPS navigation system, laser and radar altimeters, and inclinometer. It is noted that the Digital Elevation Model (DEM) derived from the laser altimeter differs by an average of approximately 1.6 metres from that derived from the radar altimeter; the cause of this is under investigation. Current indications suggest the radar-derived DEM is the more accurate. The electromagnetic system was the Geotech Time Domain EM (VTEM TM Plus) with full receiverwaveform streamed data recording at 192 khz. The full waveform VTEM TM Plus system uses the streamed half-cycle recording of transmitter current and receiver voltage waveforms to obtain a complete system response calibration throughout the entire survey flight. The VTEM TM Plus transmitter loop and Z-component receiver coils are in a concentric-coplanar configuration and their axes are nominally vertical. An X-component receiver coil is also installed in the centre of the transmitter loop, with its axis nominally horizontal and in the flight line direction. The receiver coils measure the db/dt response, and a B-Field response is calculated during the data processing. VTEM Plus Data Release Readme - ecat docx 1

4 In-field data quality assurance and preliminary processing were carried out on a daily basis during the acquisition phase. Preliminary and final data processing, including generation of final digital data products were undertaken from the office of Geotech Ltd. in Aurora, Ontario. A set of Conductivity Depth Images (CDI) were generated using EM Flow version 3.3, developed by Encom Technologies Pty Ltd. A total of forty-five (45) db/dt Z component channels, starting from channel 4 (21 µsec) to channel 48 (10667 µsec), were used for the CDI calculation. An averaged waveform at the receiver was used for the calculation since it was consistent for the majority of the flights with minor deviation from the average. The Data release package includes: Point-located final electromagnetic db/dt and derived B-field data ( X and Z component) with associated position, altimeter, orientation, magnetic, and derived ground elevation data. To reduce data volume only the FINAL B field and db/dt data have been included in a combined file along with separate files for the two fields. In addition these files have been decimated, where only every 3 rd station (approx. 10 m) is reported. These data are in ASEG- GDF2 ASCII column format with associated header files. The waveform file containing the 192 khz sampling for the transmitter current. Point-located conductivity estimates derived using the EM Flow conductivity depth imaging (CDI) algorithm with associated position, altimeter and derived ground elevation data. These data files include the conductivity estimate for each 5 m interval. Two point located files have been produced one with depths (every 5 m interval) and one without. In addition decimated files have been constructed for release where only every 3 rd station (approx. 10m) is reported. These data files are in ASEG-GDF2 ASCII column format with associated header files. Selected depth slices of the point-located conductivity estimates derived using the EM Flow conductivity depth imaging. These depths are: between 0 and 5 metres depth between 5 and 10 metres depth between 10 and 15 metres depth between 15 and 20 metres depth between 20 and 30 metres depth between 30 and 40 metres depth between 40 and 60 metres depth between 60 and 100 metres depth between 100 and 150 metres depth between 150 and 200 metres depth between 200 and 300 metres depth Gridded data, at 500 m cell size, for the Digital Elevation Model (DEM), the Total Magnetic Intensity (TMI) as well as for the conductivity depth slices derived from the EM Flow CDI data. The gridded data files are in ER Mapper binary raster grid format with associated header files. Depth slices provided are for; between 0 and 5 metres depth between 5 and 10 metres depth between 10 and 15 metres depth between 15 and 20 metres depth between 20 and 30 metres depth between 30 and 40 metres depth between 40 and 60 metres depth between 60 and 100 metres depth VTEM Plus Data Release Readme - ecat docx 2

5 between 100 and 150 metres depth between 150 and 200 metres depth between 200 and 300 metres depth Graphical multi-plots, in PNG format, for each flight line showing from top to bottom; (1) pitch and roll of the transmitter-receiver, (2) transmitter-receiver height, (3) power line monitor, 4) magnetics TMI and first vertical derivative, (5) dbz/dt profiles, (6) conductivity-depth image (CDI) in logarithmic colour scale, and (7) CDI in linear colour scale. Contractor supplied Operations and Processing Report. ESRI shape and MapInfo files of the flight lines. Figure 1: East Isa VTEM TM Plus Survey location VTEM Plus Data Release Readme - ecat docx 3

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