An area centred near Lake Phibbs, ~70 km west of Marree, which also abuts the southern edge of Lake Eyre South, is being explored for possible economic buried Olympic Dam type IOCG-U mineralisation that might exist within covered basement in a poorly known geological setting ~110 km NNE of Olympic Dam. The target is a gravity anomaly located on the eastern edge of the Stuart Shelf. During the first licence year, a detailed, 3230 line km helicopter-borne magnetic and radiometric survey was flown in October 2014 to cover the entire tenement along north-south flight lines 200 m apart, with a nominal flying height of 30 m above the ground surface. After processing of the raw survey data, a suite of images were compiled that delineated the variation in magnetic responses, these for the most part being interpreted as reflecting changes in basement lithology. The primary survey grid was subsequently infilled over the central two-thirds with a second survey sortie also flown at 200 m north-south line spacing for 1895 line km, to give an effective 100 m final flight line separation. The airborne magnetic final results confirmed a relatively featureless, but broad regional high magnetic response to the west of the Borefield Road. The lowered response to the east was thought to correspond with thick sediments lying east of the interpreted edge of the Stuart Shelf. A small, high frequency anomaly was outlined immediately south of Lake Eyre South. Anomalous uranium responses discerned in the airborne radiometric data from just west of Stuart Creek were investigated in December 2014 with a single roadside traverse radiometric survey of 45 ground-based scintillometer measurements, and were found to be a result of outcropping Bulldog Shale bedrock on ridge tops. A preliminary ground gravity survey was acquired in December 2014 over an area south of Priscilla Springs, when 385 stations were read on a 200 m x 800 m grid and also at 400 m intervals along a single roadside traverse. The gravity response confirmed that a large residual anomaly coincides with the broad regional magnetic high, but geophysical data modelling showed that insufficient gravity data had been collected to adequately define this anomaly, so follow-up gravity work was planned. During licence Year 2, in July 2016, a semi-regional gravity survey was acquired totalling 2108 stations read on 400 m x 200 m spacing. After reviewing the resulting gravity data, it was decided to obtain detailed infill gravity coverage at 200 m x 100 m precision in certain places showing interesting density anomalism. This planned work is scheduled for completion during licence Year 3. A small, subtle 2 square km gravity high was revealed which coincides with the previously identified short wavelength aeromagnetic anomaly located immediately south of Lake Eyre South. During licence Year 3, Javelin undertook a review and regional interpretation of all available ground gravity and detailed airborne magnetic data. The semi-detailed ground gravity survey completed in the previous reporting period was evaluated, and a detailed infill survey consisting of 929 new gravity survey was completed in response to the evaluation. The infill program was undertaken at 100 m station intervals, half of that regional survey spacing. The regional gravity survey identified 3 areas that were selected for the infill survey. Area A in the northeast corner of the survey showed a coincident gravity high with a magnetic response, the infill survey showed that this anomaly was associated with regional structures that reflected basement features rather than a discrete sourced anomaly. Area B was an elongate large north westerly gravity high that was also found to conform to the expected basement topography and was no longer considered a potential target. The third area, Area C, consisted of subtle gravity anomaly coincident with a small magnetic high in the centre north of survey area, and is the current focus of detailed modelling and interpretation and is the primary target to date. Following the evaluation of available data sets, the decision was made to reduce the size of EL 5471 to 126 km2. During Year 4 of the project a continuing review and regional evaluation of all available ground gravity and detailed airborne magnetic data was undertaken. Gravity data collected in the previous reporting period was processed and model studies completed. A residual gravity anomaly measuring 3 x 1.5 km with an amplitude of 2 mGal with 2 discrete gravity peaks, that may represent a fold or the intersection of 2 dike-like features, was defined. A reconnaissance field visit was made to a new target area, a small but well defined coincident magnetic and gravity anomaly, in the central north of the tenement.