As part of a regional exploration project targeting possible economic secondary, roll-front style uranium deposits within buried Tertiary sediments of the Anthony Palaeochannel and its several tributaries, two areas located approximately 130-160 km north-west of Tarcoola were investigated using reconnaissance ground gravity surveys and aircore drilling. 473 gravity stations were read along 23 variously configured drainage profile traverses during October-November 2005, and interpreted prospective buried palaeochannel sections forming part of previously unexplored palaeodrainage tributary features were then tested during April-June 2006 by performing aircore drilling (98 holes for a total penetration of 5225 m) and downhole gamma ray logging plus assaying of selected sediment samples. The drilling, to an average depth of 53 m, with the deepest hole reaching 99 m depth, demonstrated the presence of Tertiary palaeochannel fluvial sediments which are variously either oxidised or reduced, and thus gave early encouragment to the search for sandstone or roll front uranium deposits. Many of the drillholes, when wireline geophysically logged by running the gamma ray tool inside of the double tube aircore drill string, revealed widespread anomalous downhole radioactivity, with the maximum recorded response being 397 counts per second in hole 06ACTN25. The radiation peaks represent the following geological contexts: - redox conditions at the base of shallow (less than 20 m deep) multi-coloured sands overlying grey pyritic clay - redox conditions at the base of oxidation resulting from modern climatic conditions - gneissic basement. 2236 composited drill cuttings face bit samples taken over 4 metre depth intervals, with the sampling frequency closed to 1 metre across gamma probe anomalies, were submitted to Amdel for uranium and thorium analyses by XRF. The assay results indicated that the radiometric peaks are caused by low concentration mixtures of uranium and thorium (best value 234 ppm U+Th from hole 06ACTN79). 79 of the gravity stations read by Haines Surveys during October-November 2005 were positioned over isolated single point regional gravity anomalies noted by Southern Uranium in PIRSA gravity data obtained for the two subject licence areas. A gravity interpretation of the resulting new data was comissioned by Hindmarsh Resources from consultant Graham Bubner, who recommended two anomalies lying near the eastern boundary of EL 3396, that apparently originate from shallow dense bodies within the basement, as worthy of further investigation for potential IOCGU type mineralisation. The initial drilling carried out by Mega Hindmarsh, and that completed by previous explorers on the Tallaringa licences, had found uranium only in the near-surface environment, the deeper parts of the palaeo-channels, where tested, being barren. Although some uranium occurrences were being found at greater depths in the region, e.g. at Fission Energy's Pundinya prospect in the Wynbring Palaeochannel, which includes 2 m @ 0.2% U3O8 from 51 m depth, it was believed that shallow targets should be the prime focus of Mega Hindmarsh's ongoing efforts. Due to a drilling rig breakdown, a further sedimentary uranium exploratory drilling programme planned to start in August 2006 was postponed. In its stead, a trial surface biogeochemical sampling survey was conducted during May 2007, along the previous aircore drill traverses, to establish whether such surface sampling could indicate where shallowly buried zones of elevated uranium and associated trace-metal rich minerals might be detected. At Tallaringa North a total of 109 samples were collected, and at Tallaringa South, 35 samples. For this trial a number of plant species were preferentially sampled, based on their expected depth of root penetration. The following species were sampled, listed in order of assumed root depths: Acacia aneura, Eucalyptus socialis, Grevillea pterosperma, Casuarina pauper, Maireana sedifolia and Senna artemisioiides ssp. petiolaris. In the laboratory two sample preparation methods were used, to determine which of two detection limits showed the best results. The first one used was a standard Ultratrace method involving aqua regia digestion, while the second involved first ashing the sample at 475°C for 10 hours, the produced ash then being digested in aqua regia. The ashing step concentrated the metallic fraction in each sample prior to its digestion, resulting in a lower detection limit and a higher precision. It was found that the biogeochemical sampling at Tallaringa South expressed multi-element anomalies in both leaves and twigs of Eucalypt and Acacia sampled directly over low level uranium mineralisation (from maximum downhole assays of 50 ppm U at 22 m depth and 14 ppm U at 16-19 m depth). The vegetation is successfully expressing this mineralisation through root penetration beneath aeolian sands, calcrete duricrust, clays, and sands/sandstone. A cross-section for the drill traverse at Tallaringa South clearly shows a uranium anomaly expressed in the Acacia twigs over the uranium mineralisation in hole 06ACTS05. The best biogeochemical expression of buried uranium mineralisation at Tallaringa North occurs in Acacia aneura, with indications that Maireana sedifolia may prove useful as a secondary sample medium, especially in areas with minimal sand cover. The Acacia aneura twig samples have expressed buried uranium concentrations of as little as 20 ppm U at depths of ~20 m. It was evident that regolith-landform variations across the orientation area significantly affect the degree of surface vegetative expression of uranium and associated pathfinders. Methods to weight or normalise the biogeochemical data by regolith-landforms therefore need to be investigated, in an endeavour to better display weaker uranium responses without creating false anomalies. Although the above field trial which sampled vegetation over known low-grade uranium occurrences produced very good results, the anomalies were spatially specific, thus limiting its value during the regional phase of exploration, but confirming its usefulness at the target definition stage. It was decided to trial a new biogeochemical surface sampling method with a larger 'halo' of sensitivity, namely, kangaroo scat sampling. It would be the first known use of this technique for regional geochemical assessment. It was hoped that sampling kangaroo scats on a broad spacing would provide an effective regional, cheap exploration tool, which was likely to highlight anomalous uranium both within and beyond palaeochannels. Accordingly, during March-April 2008 samples of kangaroo scats were collected at 110 sites spaced 3.2 km apart. Results from this trial scat sampling programme were enough to justify conducting further scat sampling in the region, ideally at about 1 km sample spacing, as the method was able to successfully identify zones of elevated and anomalous uranium, gold and many other elements of economic interest. The samples were easy to collect and were cost-effective to process and analyse. This survey also shows significant landform effects, particularly in the south where there is extensive sand sheet and dune coverage, emphasising the importance of accounting for regolith and landform variations when interpreting results. Nevertheless, a number of target zones were identified, each one representing a new opportunity for the discovery of uranium mineralisation, since almost all these zones have little or no historical drill tests. The main >40 ppb U anomalies defined by the kangaroo scat sampling are geographically clustered, confirming their validity. No further work was carried out on the subject tenements after mid-2008, and their tenure was allowed to lapse at the end of the first 5-year term. It was explained that a change in corporate financial priorities meant that the majority of exploration funds would henceforth be spent on evaluating the relatively advanced status Lake Maitland calcrete uranium deposit in Western Australia.