In a search for possible economic Palaeoproterozoic syngenetic/stratiform base metals within an area located just north of Cleve on central Eyre Peninsula, geological mapping (1:20,000 scale) and rock chip sampling was carried out over poor exposures of the three main bands of the target Hutchison Group banded iron formation (BIF) facies, by which means five anomalies were identified in the Mount Shannan area which suggested that such mineralisation could be present. The bedrock under cover was then geochemically sampled over a 50 km cumulative strike length by RAB drilling (1008 holes for 2336 m total penetration) and hand auger sampling traverses (yielding 1496 samples taken at 25 m intervals along lines 1 km apart). This work was undertaken on a 15 km x 2.5 km grid aligned in a north-eastwards direction, including and extending along strike from the known Pacminex lead-zinc occurrences at Yeldulknie Creek, where earlier regional stream sediment sampling had delineated 2 significant base metal anomalies. Pacminex had drilled five RAB holes over the zinc anomaly, which occurs within biotite-muscovite-quartz-feldspar gneiss to schist. Its best drill intersection was obtained in hole ZN1, which had 10 m @ 0.15% Pb, 0.71% Zn and 5 ppm Ag. Another single drillhole, PB1, put down over a lead anomaly occurring in quartz-feldspar gneiss near its contact with a dolomite unit, had failed to intersect significant mineralisation. Samples obtained from the southern half of the CRA grid returned best values of 0.29% Zn and 1280 ppm Pb from separate locations. Four units of BIF stratigraphy were established, based on the bedrock drilling. Sampling of the calcareous 'dolomite' unit found near the base of the sequence indicates that it is lead-zinc anomalous (to 1150 ppm Pb and 2200 ppm Zn) for up to 4 km of strike length. Elevated zinc seen in other units appears to be related to an increased proportion of amphibolite interlayers within the schists, or to very effective scavenging of the rocks by notable levels of associated manganese during a long diagenetic history. BIF at the Mount Shannan North prospect has anomalous uranium, to 130 ppm U. Whole rock silicate analyses of 42 samples of the BIF, to examine the effects of weathering on them, have disclosed a compositional trend passing from "silty" Al2O3 bearing BIF in the north to inversely CaO rich BIF in the south. The better base metal values are associated with iron formations containing >2% Al2O3, plus "middle order" SiO2 and Fe2O3 contents of 20-70% and 40-60% respectively. The orientation bedrock geochemistry line run over the extant main Pacminex anomaly at Yeldulknie produced results of a similar tenor overall, subject to variations in sample spacing and the analytical method. However, across the sampling grid in general no base metal anomalies were detected by CRA which are it thinks likely to be related to significant stratiform mineralisation. Seven costeans totalling 533 m dug by backhoe at the Mount Shannan South prospect delineated a 400 m x 30 m zinc anomaly (to 1.03% Zn) in the Mangalo Creek mine area, occurring in mica schist, amphibolitic schist and minor chert that subcrop just above an extensive amphibolite horizon. A 7-metre wide pyritic gossan was exposed adjacent to tremolite-bearing mica schists and near a magnetite-iron formation. The metal content of this gossan was disappointingly low. High radioactivity noted at the Emu Plains lead mine is caused by anomalous thorium and minor uranium introduced in a probable epigenetic environment. The radioactivity occurs in a highly weathered pale brown schist which contains traces of copper carbonate. Th varies from 4150 ppm to 3.85%, and U from 28 ppm to 670 ppm.