There are no known major water resources in the northwest Gawler Craton area. The groundwater that is used for stock occurs in Tertiary sediments and weathered basement overlying the Gawler Craton. A Transient Electromagnetic (TEM) survey which was done in 1995 (Dodds, 1996) improved knowledge of the basement topography and also detected Permian basins which were previously unknown. The current survey extends that knowledge and precedes drilling to improve the knowledge of water resources, which may be needed as a result of increased gold and base metal exploration in the area. All available data has been integrated to yield a map showing the elevation of the unweathered surface of the northwest Gawler Craton, which is considered to be basic to the understanding of the overall groundwater situation.