CRA's acquisition and interpretation of aeromagnetic and ground magnetic surveys, plus its gravel and stream sediment sampling, have successfully located a few kimberlites in the Truro area, 70 km north-east of Adelaide, where a large number of kimberlitic indicator minerals are present in many local drainage systems. Three microdiamonds were recovered in heavy mineral concentrates obtained from the surface sampling, but drilling to locate their source(s) proved unsuccessful (in 24 RC percussion and 1 diamond drillholes totalling 1495 m). The source of the Angaston 1 aeromagnetic anomaly was found to be a steeply dipping, 300 m long by 55 m wide kimberlite diatreme which intrudes biotite schists of the Strangway Hill Formation. This kimberlite is non-diamondiferous, as determined by bulk processing of percussion drillhole cuttings samples. It has been dated at 163.3 Ma (+/- 17.8 Ma), i.e. Middle Jurassic, using U-Pb fission track dating methods, which is a similar age to that reported for the Mount Hope and Eurelia kimberlite swarms tested elsewhere in SA. Rock samples collected from the north of the Eudunda 5 anomaly grid were subjected to petrological examination, kimberlitic indicator observation and whole rock geochemical analysis. The petrological report identified the rocks as the minette variety of lamprophyre, and suggested that they were too fractionated to host mantle xenoliths or diamonds. Processing of a 50 kg sample failed to recover any kimberlitic indicator minerals or diamonds. Routine analysis of drillhole samples for base metals and gold returned only uniformly low values, except in the case of holes RC94TR18 and 19 drilled to the north and east of Collingrove, where elevated Co and Cu are present. Re-sampling of outcropping bedrock at the Golden Gate mine, located 5 km south of Angaston, where Aztec Exploration had earlier reported that gold anomalism exists in soil and rock chip samples, effectively replicated the tenor of those results (up to 0.5 g/t Au), but the gold appears to be associated only with thin, discontinuous iron-stained quartz veining, and the presence of a significant deposit is thus regarded as unlikely. Subsequent to the discovery, made by PIRSA Minerals Div. geologists in 1995, of outcropping mineralised gossans with up to 26% Zn and 3% Pb located at the contact between the Cambrian carbonaceous Karinya Shale and psammitic Backstairs Passage Formation, further CRA exploration consisting of rock chip, soil and stream sediment sampling, additional drilling (6 RC and 2 diamond drillholes totalling 582 and 475 m, respectively) and downhole geophysics targeted potential stratabound base metals within the Karinya Syncline. Anomalous base metal geochemistry was returned from the surface rock chip sampling (variously up to 22.4% Zn, 3.92% Pb and 73 ppm Ag), and down-dip drilling along a 500 m strike length of the target stratigraphic contact at the Holmes Watson prospect yielded a best mineralised intercept in hole TR96RC27 of 2 m @ 8.10% Zn, 2.37% Pb and 33 ppm Ag from 50 m depth. The mineralisation comprises pyrite-sphalerite-galena(-chalcopyrite) contained within a carbonate facies developed in fine-grained siliceous metasandstone below the Karinya Shale, and shows strong similarities to the Mississippi Valley style of stratabound base metal deposit. No new occurrences of such mineralisation were identified away from the Holmes Watson prospect, but the contact zone between the Karinya Shale and Backstairs Passage Formation remains highly prospective throughout the Karinya Syncline. Future work is planned that will focus along this contact zone to attempt to find mineralised parts having increased grade and thickness.