A wide basinal area located east of Marree and bordering the northern Willouran Ranges is being explored afresh for sedimentary uranium occurrences in response to market conditions and the demonstrated prospectivity of the local cover rocks, which previous explorers had reported as containing minor, surficial secondary uranium minerals plus numerous radiometric anomalies, many of which remained untested. For the current exploration effort, Exploration Licences 3620, 3621 and 3622 were initially selected to test the hypothesis that economic secondary uranium mineralisation could be derived from Proterozoic rocks underlying the Jurassic and Cretaceous Eromanga Basin sequence, with the uranium envisaged as having been transported some distance by hot artesian groundwater and then precipitated in natural discharge zones. Because the region's artesian groundwater regime has probably been in existence since the late Lower Cretaceous, and natural discharge zones have migrated westwards during the later phase of deposition of this basin sequence, it is thought likely that there is potential for uranium occurrences to be spread radially for several tens of kilometres within the current margin of the Eromanga Basin. This theory is supported by the fact that groundwaters issuing from several now active springs and mound springs that cluster along the western margin of the basin do carry anomalous uranium. Initially, Adavale Resources undertook a review of existing geological and geophysical data to aid its selection of sites that could have indications of the above type of uranium mineralisation. Follow-up field-based exploration involved the inspection of airborne radiometric anomalies and outcrop structures interpreted from photogeology, geological mapping, and vehicle-borne radiometric surveys. The results of this work identified two areas of interest: - firstly, a Tertiary sedimentary basin covering approximately 120 square km, informally named the Clayton Basin, was identified in EL 3622 (and operationally designated as the Lake Surprise Project). This past depocentre for fluvial and lacustrine sediments is now mostly concealed below Recent surficial cover, but there are a few silicified quartzose sandstone and silcrete outcrops, some of which have visible carnotite, and a central zone of approximately 20 square km which generally has above background radioactivity. Field assays made at widely scattered locations recorded uranium content in the rocks of between 100 and 374 ppm U. Of special interest is a scarp, approximately 1.2 km in length and 2.5 to 3 m high, that was assayed at 11 locations and averaged 189.9 ppm U. A petrological study of samples of these outcrops has shown that the original sediments were probably derived from a granitic terrain, and that the carnotite seems to be bound to a colloform opaline cement within the silcrete samples examined. In one instance carnotite was also observed occurring within a small outcrop of hard grey dolomite rock. - secondly, an area in EL 3620 (operationally designated as the Mumpie Project) was identified from a review of airborne radiometric data, and from features seen on later geological traverses, as having potential for sedimentary uranium to have been precipitated in southwest-northeast orientated Tertiary palaeochannels. Four related areas that emanated anomalous radioactivity (>100 cps) were detected on alluvial and colluvial plains devoid of outcrop. An 80 hole reconnaissance RAB drilling programme was subsequently carried out in the central part of the Clayton Basin during August 2007, for an aggregate penetration of 971.7 m. Anomalous zones of logged high gamma ray activity (100 to 1270 API units) were recorded at shallow depths (<9 m) in 30 of these drillholes. It was hoped that this response might indicate the presence of uranium mineralisation occurring as economic grades. Experiments carried out with a spectrometer showed that low level airborne radiometric surveys using a light aircraft held promise for making further discoveries of uranium-anomalous areas within the three EL areas. As well, ground resistivity traverses were planned to see if the contact between the Murnpeowie Formation and Morney Profile could be mapped, and also to see if oxidised and redox zones could be identified in subsurface environments. Further RAB and core drilling on ELs 3622 and 3620 and geological mapping on EL 3621 was undertaken during their second licence year. Grid pattern drilling and calibrated gamma-ray logging performed at the Jubilee prospect and Plastic Tank uranium occurrences on EL 3622 (totalling 145 vertical holes for ???? m) indicated that there the near-surface uranium enrichment is highly discontinuous laterally, i.e. is very patchy, and occurs in silicified rocks that are generally less than 1 m thick. RAB drilling performed on EL 3620 (47 vertical holes for ??? m completed during October 2007, plus 19 holes for ??? m completed during May-June 2008), which was newly undertaken to evaluate airborne radiometric anomalies sourced from within Cainozoic outwash fanglomerates that extend northwards into the tenement from the Flinders Range, revealed widespread shallow ( 500 ppm eU3O8 recorded in hole CB4, which was subsequently cased. To test whether an economic uranium deposit might exist in the vicinity of this hole, the last three holes of the programme were located at a 60 m radius around CB4, but they recorded no significant gamma anomalism. A ground spectrometric survey was later read on an 80 m x 80 m grid laid out around the hole CB4 casing collar. The survey results showed quite clearly that the hole had been drilled into a pod of uranium mineralisation approximately 10 m in diameter. The survey results also showed other pods within the gridded area that have higher apparent uranium spectrometric values than that of the discovery hole. During Year 4 of the project, a further 10 vertical rotary mud holes were drilled on EL 3620 along four traverses at 500 m hole intervals during July-August 2010, for a total penetration of 575 m. A planned more extensive drilling programme could not be completed due to winter rain curtailing access to the targets. Al of the holes were gamma ray logged through the drill rods, but few notable radiometric responses were recorded. One exception was in hole T4.15 over the depth interval 48-50 m, within 'basement' impermeable dark grey Lower Cretaceous claystones, where a log peak of 400 counts per second was recorded. During Years 5 and 6 of the project, no field work took place, mainly because Adavale Resources was now experiencing frustration in its attempts to consolidate the promising uranium discoveries it had so far made at the Jubilee prospect on EL 3622 into a measurable resource (to be based in part on data from 30 cored holes completed for the purpose of quantifying other indirect means of determining the rocks' uranium content). It cited several complicating factors which were causing this situation: the complex depositional environment, the widespread and patchy nature of the uranium which it had already found occurring in several Tertiary palaeochannel relict ‘roll front’ enrichment zones, and professional deficiencies that had occurred from time to time during drilling data collection, that arose in the interests of cost-cutting [this latter issue included the serious mistake of failing to retain of most of the 1-metre drill cuttings samples and many of the rotary core samples, which had been returned to their holes during rehabilitation backfilling, or were merely discarded subsequently, thus preventing the possibility of performing retrospective analyses to check for radioactive disequilibrium, of which there is a strong likelihood]. Although the potential uranium resource lies at shallow depths, usually within 10 m of the ground surface, the geological complexity and apparent association of uranium with patchy and irregularly shaped zones of silicification had led the licensee to doubt that conventional evaluation methods could reliably be adopted in future to delineate a resource. As a consequence, the company planned to spend a while reviewing the existing 374 hole drilling and gamma ray logging database, and through the construction of geological cross sections, it hoped to identify areas that require further infill drilling to close gaps in knowledge need for determining if indeed there is potential for defining an economic uranium resource, particularly within the Clayton Basin on EL 3622. Here the uranium occurs within silicified sandstone and silcrete, so its extraction may require open-cutting, crushing and heap leaching. The company also planned to critically examine its exploration data from EL 3620, to decide whether the deeper palaeochannels that originate from the northern Flinders Ranges actually do have any potential for uranium. The data gathered there to date in 66 drillholes had indicated that these rocks only contain disseminated uranium which has been trapped in fine grained sedimentary rocks and soft sediments, whereas the coarser, still porous clastic sediments do not contain uranium, and therefore the palaeochannel sequence as a whole appeared to be unsuitable for in situ extraction. During Years 7 and 8 of the project, the licensee's technical consultant assembled together and then interpreted all of the available still preserved data pertaining to the sedimentary uranium occurrences which Adavale Resources had discovered on ELs 4949 and 4950. He identified several areas of anomalous radioactivity, apparent in the drillhole gamma ray logging data, that are enriched in potentially economic uranium, and discussed them in terms of their similarities or differences to idealised sedimentary ‘roll front’ deposits. All of these potential uranium resources are shallow, lying just below the ground surface to depths of about 25 m, and all have average eU3O8 concentrations of >100 ppm and an average thickness of greater than 0.5 m. They constitute 14 Resource Blocks which he has mapped in the Jubilee deposit area, some of which appear to be linked, and they lie within segments of a sinuous, divergent and convergent, Tertiary palaeochannel system. Within this palaeochannel there are examples of ‘roll front’ style, unconformity-related and sheet-like uranium deposits. Most of the anomalous zones are associated with silicified quartzose sandstones and hard silcrete; however, it is questionable whether these silicified rocks have acted to retain and preserve the uranium from depletion by recent groundwater movements which may have removed much other uranium from adjacent porous sandstones, or whether the remnant anomalous radioactivity is in large measure due to uranium decay products that are present in a disequilibrium state. The overall grade within the resource blocks appears to increase southwards towards the uraniferous granite source area in the northern Flinders Ranges. The combined JORC-compliant Inferred Uranium Resource in the Jubilee deposit area is estimated to be 181,000 pounds of eU3O8 worth approximately US$5.18 million. A newly identified, larger deposit, Mookwarinna, lies within an anomalous zone approximately 9 km in strike length located in the mostly unexplored southern part of EL 4950. The resource in this area is outlined by four 100 m spaced drillholes that occupy an area of about 16 ha surrounding hole CB4, and is estimated to be as large as 592,000 pounds of eU3O8 worth approximately US$16.88 million (estimated from the July 2014 quoted price of US$28.50/lb). These first two inferred uranium resources should only be regarded as an indication of the size of the resource that might exist in a given area of the Clayton Basin, in order to promote future efforts directed towards definite economic realisation that the consultant believes could be achieved through undertaking more exploratory and/or infill resource identification drilling. Most of the anomalous areas identified so far do require further drilling, either because they are ‘open-ended’ or because the existing drill spacing was too broad to fully demonstrate the continuity and average grade of the potential resource.