Within the now relinquished portion of the licence area, four gravity traverses totalling 34.4 line km and 11 rotary mud drillholes for 593.2 m were completed by CRA in a search for possible sedimentary roll-front type uranium deposits formed within Eocene sediments deposited in the Reedy Creek Sub-basin, east of the Palmer Granite batholith. However, the Tertiary sediments which were encountered did not originate from this provenance, but are predominantly marine. The drilling did not define any lateral redox fronts, and all downhole samples assayed for uranium returned low values. During 1980, two airborne magnetic and radiometric surveys together covering 8060 line km were flown over the south-western margin of the Murray Basin to try to obtain detailed structural information about the pre-Tertiary basement. Scout rotary mud drilling (7 open holes for 778 m, 3 of which lie within the relinquished area) and geophysical wireline logging were then carried out to look for any development of shallow lignite, but no coal or carbonaceous sediments were found. Ground magnetic data were acquired over four discrete aeromagnetic anomalies lying within the relinquished area which had been selected as representing potential buried kimberlite targets. Rotary mud drilling and bottomhole coring to TD 24.7 m during December 1982 on one of the anomalies, MB4, met with a non-diamondiferous altered pyroxenite body. In a search for possible economic stratiform/hydrothermal base metal deposits hosted by Cambrian basement, ground magnetic and soil geochemical data were acquired along a traverse laid out over an intense aeromagnetic anomaly seen to the north-east of Callington. Percussion drill testing (1 hole for 200 m) of a 100 m wide zone of anomalous copper geochemistry (max 600 ppm Cu) in Kanmantoo Group biotite schists and granitic pegmatite sheets did not disclose any significant metal mineralisation (maximum 425 ppm Cu from the depth interval 64-66 m). An airborne INPUT electromagnetic survey was flown across the central part of EL 964 during November 1983. Follow-up ground magnetic and Sirotem profiles were run over two coincident magnetic/INPUT anomalies occurring beneath shallow cover. Subsequent rotary mud and inclined percussion drilling of the anomalies (7 holes for 922 m) did not intersect any significant metal mineralisation within fine-grained pyrrhotite-pyrite schist horizons.