In a search for possible extensions to existing, almost worked-out poddy deposits of damourite mica and kaolinised sillimanite, that may occur within an area of prospective Barossa Complex Proterozoic basement inlier rocks located south-east of Williamstown, reconnaissance geological mapping has located two potentially mineralised zones. One lies on Private Mine Area 13, and the other occupies land just to the south of the Warren Reservoir that is heavily encumbered with reserves or private ownership.