The NTGS Brunette Downs Gravity Survey, 2021, is a survey funded by the Northern Territory (NTGS) and managed by Geoscience Australia (GA). Atlas Geophysics was commissioned by GA to conduct the survey. The survey was conducted as part of NTGS’s Resourcing the Territory initiative and was given a survey ID of 202180. The survey is a roughly east-west rectangular shape covering approximately 57,000 square kilometres. It consists of a 2km by 2km grid across the entire survey area, in some areas omitting existing 4km by 4km gravity stations, and several areas of infill at 1km by 1km and 500m by 500m. The survey covers approximately 57,000 square kilometres, to the north and east of Tennant Creek to the border with Queensland. This survey acts as infill for other surveys: 200980 “Barkly”, 201580 “Northern Wiso Basin” and 201701 “Southern Nicholson”, which were acquired in regional 4km x 4km grid configurations. The data package consist of 17,312 gravity stations as a point located dataset, a series of grids in GDA94 Geodetic at 500m equivalent cells size, and the Operations Report.

Geoscience Australia conducted the Eucla Gawler 2D Seismic Survey in 2013-14. The survey involved the acquisition of seismic reflection and gravity Data over the Eucla Basin and Gawler Craton. The survey consisted of a single line (13GA-EG1), totalling 834kms. This dataset comprises the Eastern half of the line (374km) and the entire line (834km). The project is a collaborative project jointly funded between Geoscience Australia, the Geological Survey of Western Australia, the Geological Survey of South Australia and AuScope. The primary objective of the project was to image the crustal architecture of the geology underlying the Eucla Basin and its relationship to the Gawler Craton to the east and the Yilgarn Craton to the west. As well as establishing the subsurface extent of the Eucla Basin and look for large structural zones that may have provided fluid pathways for mineralisation. Raw data for this survey are available on request from clientservices@ga.gov.au

This grid represents gravity anomalies of the Australian region. The grid combines accurate onshore gravity measurements, with satellite data over the offshore region. The cell values represent simple Bouguer anomalies at a density of 2.67 tonnes per cubic metre onshore and free-air anomalies offshore. The grid cell size is 0.5 minutes of arc, which is equivalent to about 800 metres.

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