A previously reported occurrence of anomalous molybdenum geochemical values to 150 ppm Mo, recorded from assays of concretionary limonite samples taken from the Lake Kitty claypan located near the southern coast of Kangaroo Island, was investigated by AOG Minerals, who sought to examine the underlying bedrock material for possible molybdenum mineralisation. Mapping of the local geology around the margins of Lake Kitty revealed sparse outcrops of a predominantly coarse ?Palaeozoic granite that becomes gneissic banded in many places, and is in discontinuous contact with probable Kanmantoo Group schists which exhibit thermal contact metamorphic effects. The limonite of interest forms two bars of heavy rubble on the surface of the claypan, extending up to 120 m from its north-eastern shore out into the lake body. It was inferred that these ironstone bars could represent weathered non-outcropping dyke-like bodies which markedly differ in composition from the mapped outcrop. Initial geochemical sampling (3 composite chip samples) confirmed that the limonite bars are molybdenum-enriched by 10-fold relative to the country rocks. Follow-up hand auger sampling along two short traverses across the bars attempted to sample beneath the limonite cap. This activity was hindered by a seasonal high water table in the lake bed, and auger penetration to deeper than one metre proved impossible. It was found that the limonite was pisolitic in texture below its crusted cap, and where tested was no more than 40 cm thick. The underlying rock was weathered granite and possible aplite, which returned values of no more than 5 ppm Mo from the 18 auger samples taken for assay. In consequence of these results, the surficial high molybdenum values are inferred to be due to scavenging by iron species present in the limonite, and therefore do not represent possible economic metal concentrations in underlying rocks. It was recommended that the exploration licence shortly be surrendered.