Exploration for possible buried economic iron oxide - associated copper-gold (IOCG) mineral deposit targets within the subject area of the north-western Gawler Ranges utilised existing and newly acquired regional gravity data to attempt to identify anomalous altered basement zones in the vicinity of three major, long-lived regional crustal shear structures. Secondary targets comprised possible fault-related occurrences of gold only or gold plus tin mineralisation. Work commenced with a 1 km x 2 km spaced gravity survey (21 stations) over the eastern subarea of the licence. No significant gravity anomalies were identified. Next came the acquisition by Minotaur in October 2005 of infill gravity data (99 stations) at 400 m x 400 m spacing, to address a regional gravity feature of interest noted in the central licence subarea. This survey delineated a 3 mGal residual gravity anomaly which was then seen to coincide directly with a curvilinear magnetic feature, suggesting that it might represent a magnetic and dense source body. The geophysical best-fit model utilised an average density of 3.1 g/cc that could be indicative of either a magnetite-hosted, IOCG type altered source body or a magnetite-rich formation. However, subsequent drilling of a north-south traverse of 7 exploratory vertical aircore holes totalling 316.5 m, that all ended in felsic granitoids, was unable to identify any rocks that could cause this coincident gravity/magnetic anomaly. Surface calcrete sampling, which was previously extensively performed by other explorers across the entire present licence area, plus additional limited calcrete sampling done by Minotaur (102 samples) over the eastern and central subareas, failed to reveal any anomalous gold, copper or other trace metal geochemistry : this deficiency would tend to suggest that the above geophysical features do not reflect an IOCG-mineralised system, nor a gold-only occurrence either. Three rock samples were collected from epithermal quartz veins, within the Yerda Shear Zone, that cut Gawler Range Volcanics rocks to the north of Kokatha Homestead. One of these samples contained elevated gold (0.25 ppm Au). Consequently, another 46 rock, soil and surface lag samples were collected in locations with less well-exposed basement that were interpreted as lying along an easterly continuation of the Yerda Shear Zone: however, no other anomalous gold was encountered. Latterly, processing by joint venturer Toro Energy of NOAA satellite thermal infrared data and of some regional airborne EM survey data which it had acquired in July-August 2006 revealed a segment of a Tertiary fluvial palaeochannel buried within the licence central subarea : however, further interpretation of available radiometric data served to indicate that this feature would have only limited potential to host sedimentary uranium mineralisation. Separate processing by Minotaur of the AEM data to look for late-time basement conductors proved unsuccessful.