The three Denison Range Project tenements, centred approximately 70 km south-east of Oodnadatta, which cover alluvial plains formed adjacent to the south-eastern edge of said range of hills that comprise eroding Palaeo- to Mid-Proterozoic uranium-rich basement sequences, have been targeted by Afmeco for finding possible buried economic sandstone-hosted secondary uranium mineralisation in Mesozoic sandstones located there. During October-November 2011 in the first year of project activity, a first-pass rotary mud drilling programme was carried out to elucidate the oxidation state and pore fill nature of potential Early Cretaceous shallow marine sandstone and Middle Jurassic fluvial sandstone uranium traps. 9 vertical holes with a total penetration of 2112 m were completed within EL 4629, while another 2 holes for 442 m were completed on EL 4750. Weak uranium anomalism detected on downhole gamma ray logs (<100 ppm eU3O8), which appears to be related to past changes in chemical redox conditions, was observed mainly at the contact between the Algebuckina Sandstone and basement, where the basement has an elevated background compared to the overlying sands. Anomalies were also detected within the Algebuckina Sandstone at the contact between oxidised sand and organic-rich reduced sands and silts. More generally within the sedimentary sequence, weak anomalies were observed at discontinuities between lithologies, i.e. at the contact between porous oxidised sand and overlying/underlying reduced clays and silts. Major porous sand units intersected during the 2011 drilling campaign are predominately reduced, retaining pyrite and on occasion organic matter interbeds (observed in three holes, up to 6 m thick). Intervals of weakly oxidised sands were seen within the Algebuckina Sandstone, typically at the top of the unit. The existence of oxidised Algebuckina Sandstone outcropping around the eastern flanks of the Denison Range indicated to Afmeco that a buried redox boundary within this thick porous sand unit should lie in closer proximity to the range front, where oxidised uranium-bearing groundwater baseflow is able to enter the basinal aquifer system. Accordingly, further exploratory drilling was done during October 2012 at locations best fitting this supposition, to try to find the boundary. 3 vertical rotary mud holes for 664 m were completed on EL 4629, plus 1 hole on EL 4750 for 198 m. Unfortunately, no redox boundary was intersected. Afmeco therefore came to the view that groundwater recharge from the range front into the basin, at least for the present and immediate past, may be minimal. This conclusion was based on the company's observations that, presently, artesian groundwater flows into the project area appear to come from the north-east and south-west, but in these particular directions, mound springs are located along fractures, providing a route whereby pressurised artesian water can escape to the surface. Consequently, recharging groundwater from the range front probably has insufficient head to enable it to penetrate past the open fracture lines further into the basin. In addition, the mound springs fringing the Peake and Denison Inliers may arise from shallow truncation of the basal Mesozoic sandstone aquifers, or may occur because of Recent fault throw interruptions to these sandstones. The lack of a redox front may also be due to the post-Tertiary down-faulting of the basement rocks which has occurred along the eastern flank of the Peake and Denison Ranges. Due to the perceived downgraded prospectivity of the project area for containing significant size sandstone type uranium deposits, tenure of the subject licences was allowed to lapse at the end of Year 3.