The Three Corners Gravity and Gravity Survey was recorded for Beach Petroleum by Geosurveys of Australia Pty Ltd during August to October 1971. Location of the survey was in OP177 in the Northern Territory adjacent to the northern border of South Australia. The survey was comprised of 256 line kilometers of continuous reflection profiling and 282 kms of gravity profiles.The energy source was detonating cord and results were inetrpreted to indicated closure on the Colson anticline but work failed to accurately define the East Border Anticline.