Geophysical acquisition

The NTGS has commenced a program of semi-regional gravity surveys over selected areas that have unresolved geological problems and unrealised mineral potential.

There is growing awareness in the exploration industry that semi-regional gravity surveys can assist greatly in understanding rock distribution in the mineable zone.

Territory-wide gravity

NTGS conducts major regional gravity surveys, adding the resulting observations to the Geoscience Australia National Gravity Database.

Regions of interest can be downloaded from the Geophysical Archive Data Delivery System.

Gravity images for the whole of the Northern Territory can be viewed on STRIKE.

Since 1981, 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 NT is covered by 57 separate surveys, including 3 surveys flown by Geoscience Australia.

Magnetic and radiometric images for the whole of the Northern Territory and the NTGS geophysical surveys index layer showing individual survey coverage areas, can be viewed on STRIKE.

Located data and grids for individual NTGS and Geoscience Australia surveys can be requested from the InfoCentre or downloaded from GADDS.

For recent and upcoming geophysical data acquisition, go to the Resourcing the Territory website.