An area located approximately 35 km west and south-west of Anna Creek Homestead, straddling the Coober Pedy - William Creek Road, was taken up to explore for possible buried diamondiferous kimberlite intrusions that could be the source(s) of the numerous residual detrital diamond indicator minerals (DIMs) recovered by past explorers in the Balta Trig region. Following the reprocessing and image interpretation of available previous aeromagnetic survey data that covers the licence, five magnetic anomalies having inferred kimberlitic signatures were selected for ground magnetic survey follow-up. Mapping and magnetic profile analyses carried out at the two highest priority anomalies, WK16 and BK1, where the previous explorers had recovered multiple DIMs from their downhole sampling, indicated to the licensee that the past explorers' drillholes may not have adequately tested the sources for these magnetic anomalies. Therefore Reedy Lagoon drilled another 2 vertical rotary mud holes at anomaly WK16 during December 2003, for a total penetration of 205.8 m. Composite drill cuttings samples so obtained were examined for DIMs, and nine grains of these, comprising picroilmenite, pyrope garnet and chrome spinel, were recovered from within post-Permian sediments above 54 m depth in both holes. This result confirmed the reported occurrences of many DIMs in the earlier exploratory drillholes located 300 m to the west; however, the latest drilling did not encounter any kimberlite either. After spending the 2004 and 2005 licence years examining the mineralogical and geochemical characteristics of the new DIMs, and then re-assessing the potential of the remaining magnetic anomaly targets, no further diamond exploration work was undertaken during 2006 and 2007. After Reedy Lagoon farmed out its diamond exploration rights to DiamondCo in March 2007, it changed its own exploration focus to address the possibility of finding Mesozoic or Permian sediment-hosted uranium mineralisation within the palaeodrainage on EL 2755. To define the distribution of prospective palaeochannels, the licensee contracted Fugro Airborne Surveys to fly an airborne EM / magnetic survey during August 2007. AEM profiles totalling 369 line km at 500 m line spacing, plus infill of 239 line km at 100 m line spacing, were acquired using the 25 Hz TEMPEST method, with a mean terrain clearance of 120 m. The sought-for redox boundary conditions within and at the base of the Mesozoic sedimentary sequence, and in the upper Permian sediments, were interpreted from the AEM data to occur where a marked change in conductivity of the cover extends from north to south across the licence area in a well defined linear manner. Also, three potential kimberlite targets were interpreted from the infill aeromagnetic survey data within an area from which numerous DIMs has previously been recovered. These targets are aligned along a NW to SE trending structural feature which is evident in both the AEM and aeromagnetic data. During June-July 2009, 4 rotary mud holes for 337 m were drilled to test the interpreted redox boundary at target WU-1. Here wireline gamma ray logging detected low level anomalous radioactivity in aquifer sediments just above the basal Mesozoic unconformity, at about 60 m depth. Drill cuttings samples from the log-anomalous zone were scanned by hand-held scintillometer and gave a weak uranium signal. Evidence for the redox boundary was not seen in the cuttings. It was decided that further work at this locality was not worthwhile. Elsewhere during June 2009, DiamondCo drilled 3 rotary mud holes for 195 m to investigate a potential kimberlite target. Holes WK16-03, WK16-04 and WK73-01 encountered Mesozoic and Permian sediments which were sampled for possible DIMs, and 32 kimberlitic picroilmenite plus 9 possibly kimberlitic spinel grains were identified amongst the heavy mineral concentrates separated from the drill cuttings originating in the Mesozoic sequence. DiamondCo considered that the depositional age for these DIMs is much younger than the age of intrusion of the kimberlite source that it is seeking, and consequently carries no guiding spatial significance as to provenance. DiamondCo next performed comparative heavy mineral determinations on the Mesozoic sediments penetrated by Reedy Lagoon in its WU-1 drillholes, detecting 4 peridotitic pyrope garnets, 19 kimberlitic picroilmenite and 12 possibly kimberlitic spinel grains. These DIMs were also believed to be a part of the younger transported cover to the Balta region, and thus were of little help in prolonging the local diamond search. Both companies decided late in 2009 to cease exploration on EL 3505, and tenure was allowed to lapse.