As a result of the BHP Billiton takeover of the Stuart Range Project, the mineral exploration strategy was changed. Formerly, WMC had been looking for economical targets of >500 Mt size containing on average more than 2.4% copper equivalent. However, WMC's last-prepared geophysical models had suggested to that company that no such very large targets probably exist, other than at the Wirrda Well prospect. In recognition of this limitation, BHP Billiton chose to widen the project's exploration target size range to accomodate those which potentially might contain resources of >100 Mt @ 2.4% Cu. A new operating philosophy was adopted, to now: - fill data gaps for better defining known smaller footprint anomalies, e.g. Canegrass and Dingo Ridge; - test the applicability of new geophysical surveying methods, i.e. building solid Earth models, using MIMDAS, using improved UBC data inversion algorithms as pioneered by Nick Williams; and - conduct deep drilling on existing IOCG prospects with orphan holes, e.g. Wirrda Well. The over-riding exploration objectives were (a) to provide the Olympic Dam production unit with a “bolt-on” component of high Cu:S material located 600 m @ 0.56% Cu, including 145 m @ 0.92% Cu. 22 non-contiguous core samples returned >2% Cu. Hole WRD30 encountered variably haematite and magnetite-altered brecciated granite in the basement interval from 469 m to TD 1338 m. Drill core assay results revealed >500 m @ 0.92% Cu, including intervals of 141 m @ 1.5% Cu, 14 m @ 1.89% Cu and 18 m @ 1.71% Cu. The last-mentioned interval also carried the maximum intersected gold and uranium grades of 0.37 g/t Au and 0.29 kg/t U3O8. Results gained from the 2008 drilling campaign convinced BHP Billiton that the Wirrda Well South-East prospect was the priority target with its Project area exploration licences. However, the issues arising from Aboriginal heritage constraints on access to this culturally sensitive location postponed the preparation of a follow-up drill programme, and subsequent heritage surveys and consultation with three indigenous groups which for the fourth time produced an official "not cleared" ruling forced it to abandon this planned work. Another high priority IOCG target, Acropolis, was also planned to be drilled during 2009. This prospect is located in the south-western corner of EL 3713, but it also lies within the Woomera Prohibited Area Restricted Access Zone. Due to a recently revised and more convoluted access protocol required by the Commonwealth Department of Defence, it was decided to postpone drilling in this area for at least 12 months. An alternatively sited drill programme was proposed in August 2009, and preparations are currently underway to mobilise in December 2009 and commence drilling in January 2010. This 13 hole programme is based on a $3 million budget. Of the 13 holes, 11 will be drilled within EL 3713, while the remaining 2 will be located in EL 4356. Ongoing heritage constraints have prevented any prospective targets being drilled within EL 3597 due, in part, to its close proximity to Lake Torrens. A re-interpretation of the Falcon gravity and magnetic data is currently underway. The Falcon survey had in the past been partially interpreted at various stages; the gravity gradiometer data was inverted using the 3D potential field Solid-Earth software developed by BHP Billiton Minerals Exploration, but the noise in the Airborne Gravity Gradiometer (AGG) data was never rectified, leaving many unresolved "anomalies" due to high frequency noise. Furthermore, at the time of 3D inversion of the Total Magnetic Intensity (TMI) data, the interpretation did not take any Natural Remanent Magnetisation (NRM) into account, so therefore anomalies in the magnetic data could not be directly compared with gravity anomalies because they would inevitably be spatially misplaced due to NRM effects. The re-interpretation intends to rectify the noise in the AGG data, which is probably due to the spin (~11 hz) of the AGG instrumentation which caused substantial correlation misfit between the gravimeters. Based on this re-interpretation, a re-appraisal of priority targets will also be completed.