The Gawler Craton has, for some time, been known to have potential for kimberlite discoveries. Recently, Orogenic Exploration Pty Ltd found a complete range of kimberlitic indicator minerals, and five small diamonds, on Flinders Island, about 40 km offshore from Elliston on western Eyre Peninsula. While no source kimberlitic bodies have been located to date, the presence of fragile indicator minerals such as diopside, olivine and phlogopite suggests a local source, and confirms the existence of a new diamond field in SA. This paper discusses the exploration techniques used, and compares the suite of kimberlite indicator minerals from the island with the assemblage of minerals from the known barren kimberlite field near Mt Hope on the adjacent mainland, east of Elliston.