Magnetic and gravity data were assessed to determine the potential for Roxby Downs type mineralisation. The Welbourn Hill magnetic anomaly is most likely due to an intrusion lying at a depth of about 1800 m. A residual gravity anomaly of about 6 mGal occurs over the magnetic source. It is inferred that the source is ultramafic and could be a carbonatite. The Cadney Park anomaly is attributed to a ?fault - bounded zone of gneisses or granulites. A partially defined gravity high occurs adjacent to the anomaly, over a zone of subdued magnetic relief. The latter could indicate a zone of hydrothermal alteration.