In 1989, drilling investigated the potential for base metals within the Cambrian Kanmantoo Group and Late Proterozoic Sturt Group and Marino Group. On mainland, SA, Kanmantoo Group metasediments host Ag As Cu Pb Zn mineralization which has been exploited at the Talisker, Bruckunga, and Callington mines. Previous exploration on Dudley Peninsula indicated anomalous base metal values in Late Proterozoic and Cambrian metasediments, and precious and base metal mineralization in cross cutting hydrothermal veins. The 1989 drilling programme comprised 78 holes, with a total depth of 1245 metres, at 500 metres intervals along 5 traverses oriented approximately perpendicular to the strike of the basement rocks. An area to the SW of Cuttlefish Bay, coinciding with an anticline core of Late Proterozoic metasediments included 7 holes with anomalous Zn. The most promising hole CWR4 contained 110 to 685 ppm Zn from 20 to 47 metres, and 115 to 640 ppm from 12 - 30 metres. Several other holes contained anomalous Zn Cu Ni.