At the request of the South Australian Government a gravity survey to investigate the possibility of further coal basins to the north of the Leigh Creek coalfield was commenced by officers of this Bureau in October, 1947. This survey was suspended in December, and a report was prepared dealing with the work carried out to that date (1948/004 and 1948/048). The area covered, however, was only a small part of a much larger area covered by a superficial layer of Tertiary rocks, beneath which a coal basin could exist. The work was resumed in May, 1948, and was continued until September, when the party was withdrawn. In additional to the geophysical field work carried out on the covered area to the north of the known coal deposits, some work was done on the Center or Telford basin. A number of traverses was read on the western edge of the basin, with a view to determining places where shallow coal might be found. The geology of the area, technical matters, results, and recommendations are discussed in this report. Accompanying plans are included.