In a continuation of diamond and base metal exploration of newly discovered carbonatite / kimberlite intrusive bodies in an area located immediately north of Orroroo, these bodies were examined petrographically and analysed to compare their characteristics both with those of rocks from established carbonatite provinces elsewhere in the world (Norway, Siberia, Canada and Africa) and with lamprophyric rocks from other local and from overseas kimberlite fields. Geological mapping was done at 1:10,000 scale and at 1:2500 scale over the extent of six recently acquired mineral claims and in the surrounding parts of the licence, and further small dykes of similar igneous rock were located. To try to find probable other, un-noticed dykes in the same vicinity, a stream sediment geochemical survey was then conducted, sampling at the intersections of minor creeks and at intervals of about every 500 feet along the major Wongway Creek. Three separate fractions of the sieved creekbed sediments were analysed using AAS methods for copper, lead, zinc and nickel, but the resulting base metal values were unremarkable and showed no apparent increase in the proximity of known igneous bodies. Another five sediment samples were then taken from creeks that drain from the largest exposed picritic porphyrite dyke, and these were assayed by XRF for niobium. The results indicated high niobium (up to 35 ppm Nb) in the drainage areas immediately adjacent to this igneous body, compared to average background levels of 10 ppm Nb further away within the Wongway Creek system. Problems were encountered in classifying the intrusive igneous rocks to determine whether they in fact have true kimberlite affinities, but, judging them merely on the basis of their rock geochemical data, it was concluded that the picritic lithologies do not represent a likely source of economic metalliferous minerals. As a final check, a 30 cubic yard composite bulk sample of creek debris derived from the picritic porphyrite dykes was taken and a > 3.0 specific gravity heavy mineral concentrate was produced for optical analysis. No kimberlitic indicator minerals (pyrope, chrome diopside, picroilmenite) or diamonds were observed.