The licence was taken up to test the alluvial diamond potential of Tertiary gravels exposed in quarry workings at Baker Gully, which were interpreted as having been deposited by an ancestral Onkaparinga River. The surface gravels were bulk sampled (3 x 3 cubic m samples) for washing in the licensee's portable heavy mineral jigging plant to obtain concentrates for laboratory mineralogical observation. No diamonds or kimberlitic indicator minerals were found, but the samples did contain large quantities of staurolite, with lesser significant amounts of rutile, kyanite, andalusite, corundum, zircon and quartz. A further, larger 22 cubic m bulk sample was taken 10 months later for similar processing and concentrate inspection, but this time in a different laboratory, again yielding identical results. During July 1980, 12 shallow vertical RAB drillholes for a total penetration of 239 m were put down at locations sited between the known gravel outcrops and the Willunga Fault, to look for the gravel stratum in the subsurface. It was not found.