A small area centred ~80 km south-east of Oodnadatta is being explored for possible buried economic iron-oxide associated copper-gold-uranium (IOCGU) style mineralisation, as typified by the Olympic Dam and Prominent Hill deposits. The tenement was taken up to investigate gravity anomalies occurring to the east of Copper Top Hill, on the piedmont adjacent to the Denison Range, in particular a moderate gravity anomaly identified in the SARIG regional 1.5 km spaced gravity data. This anomaly appeared to coincide with a regional magnetic anomaly. Copper Top Hill was formerly the site of small scale mining in the 1800s, and has numerous pits and excavations that targeted primary high grade copper mineralisation associated with dykes in the metamorphic rocks. During the first licence year, work completed included: - all available geophysical data were collated and plotted at appropriate scales. Relevant reports, maps and images were acquired from the SARIG website and a MapInfo GIS Workspace constructed for the extended area surrounding EL 5581; - land access notifications were provided to relevant landholders; - a native title agreement was negotiated with the Arabunna Aboriginal Corporation; - a field mapping and reconnaissance trip was made to the Mount Denison – Blyth Creek area; - in June 2015, a 2170 line km helicopter-borne magnetic and radiometric survey was flown over the entire tenement along east-west lines 50 m apart, using a nominal 30 m sensor height above the ground surface; and - in May 2015, a reconnaissance ground gravity survey consisting of 133 stations was acquired at 200 m x 200 m spacing over the south-western part of the tenement, in conjunction with 828 stations that were read for GB Energy on their adjoining EL 5302. Preliminary results from EL 5581 were evaluated to determine the optimum station spacing to use for a planned semi-detailed gravity grid that would cover the entire tenement area. Areva Resources' past drilling results indicate that around 200 m thickness of sedimentary rocks overlies basement within the tenement area. The Mesozoic sedimentary sequence of Bulldog Shale, Cadna-owie Formation and Algebuckina Sandstone consists of fine mudstone and shale through to coarse pebbly sandstone, none of which was expected to make any significant contribution to the magnetic response. The apparent relatively high frequency variation in the magnetic response east of the Denison Range has therefore been attributed entirely to susceptibility changes in the buried basement rocks. During licence Year 2, work comprised: - providing ongoing land access notifications to relevant landholders and the Native Titleholders; - acquisition over the entire tenement in April 2016 of the second phase of a ground gravity survey, consisting of 2303 stations, again using a 200 m x 200 m station interval. In the south-west of the tenement part of this survey used existing lines from the small gravity grid read previously, but with the new stations positioned midway between the locations of former ones, which served to produce there infill coverage at 100 m x 200 m precision; - evaluating the new gravity data to determine areas for infill surveying; - making further field reconnaissance visits to the Mount Denison – Blyth Creek area to investigate the gravity survey results in relation to outcrop and existing copper occurrences; and - imaging and examining all of the geophysical data collected on the tenement so far to look for coincident anomalies and to determine optimum parameters for doing additional surveys. The licence area had been selected because of a moderate gravity anomaly identified in regional gravity data. This anomaly has now been confirmed and further defined with the recent gravity survey. All gravity anomalies of interest are seen to coincide with changes in the magnetic field character. Preliminary interpretation indicates that the sources of the anomalies are relatively shallow and appear to be in the upper basement. During licence Year 3 work completed included: - All gravity data collected on the tenement was imaged and evaluated to determine the location of detailed infill stations to cover the anomalous areas identified on both airborne magnetic and regional ground gravity surveys. - Ongoing land access notifications were provided to relevant landholders and the native title party. - A native title agreement that was negotiated with the Arabunna Aboriginal Corporation was continued with further field work planned. - Further field mapping reconnaissance was completed in the Mount Denison – Blyth Creek area. - An infill ground gravity survey consisting of 1208 stations was undertaken over the anomalous areas identified on the TMI and regional gravity images. - Gravity results were processed, and a preliminary interpretation carried out as a precursor to detailed modelling of the anomalous zone. - Selected areas were visited for evidence to support the ground gravity results. During licence Year 4 work completed included: • Gravity and magnetic images for the area were finalised after completion of all geophysics planned. • A field reconnaissance survey was undertaken to investigate the geophysical results in relation to the possible impact drill sites may have on environmental or cultural areas of significance. • A review of geophysical data to date was undertaken in relation to modelling studies and drill site selection. • Preliminary interpretation of the airborne magnetic and detailed ground gravity data were used to select possible drill sites.