Map(s) of Dy (dysprosium) concentration (Total content, Aqua Regia soluble content, and/or Mobile Metal Ion soluble content) in Top Outlet Sediment (TOS) and/or Bottom Outlet Sediment (BOS) samples, dry-sieved to <2 mm and/or <75 um grain size fractions. Source: The Geochemical Atlas of Australia (Caritat and Cooper, 2011)

Map(s) of Fe (iron) concentration (Total content, Aqua Regia soluble content, and/or Mobile Metal Ion soluble content) in Top Outlet Sediment (TOS) and/or Bottom Outlet Sediment (BOS) samples, dry-sieved to <2 mm and/or <75 um grain size fractions. Source: The Geochemical Atlas of Australia (Caritat and Cooper, 2011)

During 2009-2011 Geoscience Australia completed a petroleum prospectivity study of the offshore northern Perth Basin. Basement is deep and generally not resolved in the reflection seismic data. Recent improvements to the magnetic ship-track database and magnetic anomaly grid allowed an assessment of depth to magnetic sources and estimation of sediment thickness, providing new insight into basement depth and trends. 2D models along several seismic transects and analysis using spectral methods indicate that penetration of the lower sediments by high susceptibility bodies is probable. The reflection seismic evidence for these bodies is not clear, though in some cases they may be associated with faults and structural highs. Where the modelled bodies penetrate the sediments, they are mostly below or within Permian strata, except in the west of the strudy area. A moderate positive magnetic anomaly (the Turtle Dove Ridge) is modelled by massive bodies whose tops are 5-15 km below sea floor. The depth to magnetic basement map highlights sub-basins and structural highs within the northern Perth Basin, with up to 12 km of sediment in the Zeewyck sub-basin.

Interpretation of magnetic field data is complicated by the presence of remanent magnetization and benefits from palaeomagnetic and rock magnetic studies. Additionally, the planning of palaeomagnetic sampling sites and mapping of the distribution of magnetizations recovered in palaeomagnetic studies benefits from inspection of magnetic field imagery. These inter-relationships between magnetic field interpretation and palaeomagnetic studies are particularly important in Australia, where deep weathering and extensive cover by younger formations commonly lead to the magnetic field data being the most complete and detailed source of information for basement-related geological mapping and mineral exploration, and where there are few opportunities for direct palaeomagnetic sampling. For the assistance of both magnetic field interpreters and palaeomagnetists, we have developed a database tool to document and interrogate this relationship. We have started to populate the database, and are planning the facilities required to make the database available as an interactive, web-based resource. The key objectives are to facilitate interpretation of magnetic field data, increase reliability in developing deep drilling targets from magnetic field interpretation, and to better establish the spatial range of magnetizations related to igneous, metamorphic, thermal, alteration and mineralization events. Our intention is to establish a widely used, interactive, minimally-moderated resource rather than a more definitive but possibly less useful one. We envisage that the data base will grow primarily through public contributions, and will also be the forum for debate and speculation regarding Australian magnetization events. We believe that this model is appropriate for wider, global application.

An application dated 26 October 2011 for verification of a reference standard of measurement under regulation 12 of the National Measurement Regulations 1999 was received from the V Land and Property Management Authority, NSW for verification of GDA94 position on their CORSnet-NSW antenna installations. This report documents the processing and analysis of GPS data observed by the CORSnet-NSW GPS stations during a 7-day period from 9 - 15 October 2011 (day of year 282 to 288) to satisfy the position verification requirements.

In early 2011 PRL provided Geoscience Australia with new pinnacle field location data for the entire island. The Pinnacle Fields 2010 dataset (pinnacles_2010.shp) consists of polygons that were manually digitised from the 1987 Orthophotography and the 2006 Satellite Imagery around areas or fields of pinnacles. This work was completed by James Keogh from Phosphate Resource Limited in May 2010. The pinnacle boundaries shapefile is pinnacles_2010.shp and contains the following fields: Field Type Width ---------------------------------------Shape Polygon 8 ID DECIMAL 12 Area_M2 DECIMAL 8.3 Type String 10 Desc String 21 Area Decimal 8.3 Perimeter DECIMAL 8.3 Acres DECIMAL 8.3 Hectares Decimals 8.3

Aquisition by Photomapping Services with project management and ground control by Coordinated Solutions. Acquisition Start Date: January 20th 2011 Acquisition End Date: January 28th 2011 Device Name: Optech `ALTM Gemini Flying Height (AGL): 1400m IMU used: Litton LN200 Number of Runs: 50 + 2 cross strips Swath width: 1040m Flight direction: N - S Side Overlap: 40% (Hobart and surrounds) - 100% (Mt Wellington) Scan angle: +/- 20 degrees Horizontal datum : GDA94 Vertical datum: AHD Map projection: MGA 55 Description of aerotriangulation process used and residual results: LiDAR data captured using onboard GPS, IMU and ground basestation. Description of rectification process used: Trajectories and laser data corrected initially using AusGeoid98 and then adjusted to AHD using local PSMs. Spatial accuracy: 0.15m (vertical) and 0.30m (horizontal) at 1sigma Surface types: LAS classified 1m DEM Ground and Non-Ground points Average point separation: 1m Laser return types: 1st through to 4th Data thinning: No Laser footprint size: 0.42m

The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric thorium grid has a cell size of 0.000971 degrees (approximately 100m) and shows thorium element concentration of the UNKNOWN survey. The data used to produce this grid was acquired in UNKNOWN by the UNKNOWN Government, and consisted of UNKNOWN line-kilometres of data at UNKNOWNm line spacing and UNKNOWNm terrain clearance.

The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of Potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric uranium grid has a cell size of 0.0009825 degrees (approximately 100m) and shows uranium element concentration of the UNKNOWN survey. The data used to produce this grid was acquired in UNKNOWN by the UNKNOWN Government, and consisted of UNKNOWN line-kilometres of data at UNKNOWNm line spacing and UNKNOWNm terrain clearance.

The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric thorium grid has a cell size of 0.000971 degrees (approximately 100m) and shows thorium element concentration of the UNKNOWN survey. The data used to produce this grid was acquired in UNKNOWN by the UNKNOWN Government, and consisted of UNKNOWN line-kilometres of data at UNKNOWNm line spacing and UNKNOWNm terrain clearance.