As part of continuing exploration along the eastern Mount Lofty Ranges for economic Cambrian stratabound epigenetic base metal occurrences hosted within Kanmantoo Group metasediments, CRAE undertook a statistical study of existing surface geochemical data, the acquisition of parts of two airborne magnetic/radiometric surveys, reconnaissance stream sediment geochemical sampling, soil and rock chip geochemical sampling of pyritic horizons, and ground magnetic surveying. All geochemical prospects, including the Bryces Creek and Gum Gully anomalies, were downgraded by more detailed sampling work (highest assays returned being 440 ppm Pb, 1150 ppm Cu and 750 ppm Zn). Early in 1980, because recent research into the composition of the Mount Torrens deposit pyritic gossan has indicated that geochemical sampling of it would probably not detect underlying lead-zinc mineralisation, and this situation should apply to similar targets being sought in the subject Brukunga area, an exploration stratagem of spaced percussion drilling of the main Nairne Pyrite Member pyritic horizons along strike at 1.5 km intervals, with holes to be drilled down as far as the Inman Hill Formation stratigraphic boundary, was then recommended. However, the licensee changed its focus mid-year towards continued surface drainage geochemical sampling in order to cover the whole licence area at a density of about 1 sample per square km, to try to detect zinc and copper dispersion haloes. Twelve such above-threshold lead, zinc and copper anomalies were delineated and checked for contamination via resampling. Some stream sediment samples returned elevated lead and zinc values, but overall the anomaly reproducibility was poor and inexplicable. Following interpretation of the new aeromagnetic data, field investigation of Anomaly 'L' at Davidson Creek during June 1982 by 1:10,000 scale geological mapping and ground magnetic surveying confirmed the source of the anomaly as slightly magnetic amphibolite dykes that have intruded along a NNW trending fault. 13 rock chip samples collected there gave assay value maxima of190 ppm Cu, 55 ppm Pb and 70 ppm Zn. An unusual gossanous quartz-tourmaline rock that has high background assay values for tin and tungsten was found in the vicinity of aeromagnetic Anomaly 10. In view of the perceived downgraded base metal potential of all prospects that CRAE had successively generated for the tenement, a recommendation was made to management in late 1982 that the ground be farmed-out or surrendered. New work on EL 872 ceased then. A data package relevant to the subject Brukunga licence and CRAE's two adjoining licences was prepared early in 1983 and provided to an interested company. A joint venture Heads of Agreement applying to renewed Brukunga EL 1180 and adjacent EL 1204 Kanmantoo was signed between the Electrolytic Zinc Company of Australasia Limited (E-Z) and CRA Exploration Pty Ltd in March 1984. However, E-Z subsequently withdrew from the proposed JV in July 1984, after it finished interpreting the results of some recent new diamond drilling that was done by CRAE at the Mount Torrens prospect located on EL 1204. No further work was done before CRAE applied on 20/3/1985 to conditionally fully surrender EL 1180. Seeking approval by SADME, the company applied for the grant of a replacement single new licence which would cover the company's former Callington EL 1061 plus parts of its former Brukunga EL 1180, Bull Creek EL 1008 and Milang EL 964 [Note: the resulting Hartley EL 1280 was granted to CRAE on 27/3/1985].