Since 1981, Northern Territory Geological Survey (NTGS) has been flying magnetic and radiometric surveys over mineral fields and basement terrains.
These surveys progressively replaced the old reconnaissance magnetic coverage by the Bureau of Mineral Resources (now Geoscience Australia).
Early surveys were acquired on 500m line spacing and collected four windows of radiometrics, without the benefit of precise control in x-y-z.
These surveys evolved in the early 1990s into a standard specification of high-resolution 400 m line spacing, with precise location control by DGPS, collection of elevation data and 256 channel radiometrics.
As of mid 2007, over 96% of the Northern Territory is covered by 57 separate surveys, including 3 surveys flown by Geoscience Australia.
Existing NTGS and Geoscience Australia high-resolution surveys are shown on the NTGS airborne geophysical index map.
The geophysical survey index map and the gravity survey index map show the coverage areas of all the surveys. Images from the survey data and magnetic , radiometric, gravity and elevation maps of the Northern Territory are available for viewing on our Geophysical Image Web Server