In a search for possible economic sedimentary uranium deposits that may have formed in the vicinity of Curnamona Station, two and possibly three Tertiary palaeochannels were located by 6 east-west lines of reconnaissance resistivity surveying, within a Lower Tertiary sedimentary sequence that appears to cover most of the licence area. However, the conduct during November-December 1976 of an open hole rotary mud vertical drilling programme (22 holes for a total penetration of 3115 m), plus downhole wireline geophysical logging, which confirmed and delineated the extent of buried palaeochannel sands, has also indicated the probable absence of significant uranium mineralisation therein. The main, previously found Curnamona Palaeochannel was shown to be 5 to 10 km wide in the 10 km long stretch defined by the above drilling; it is heading in an east to north-east direction, and contains up to 65 m thickness of inferred Eyre Formation equivalent channel fill sediments. Deposition within it appears to have always occurred in a meandering fluvial environment, with the channel sinuosity increasing over the passage of time, accompanied by gradual channel widening. The palaeochannel sedimentary sequence has been subdivided by Minad into five mappable units. Very minor gamma log radioactivity kicks were recorded rarely from within the thickest and oldest unit, the 'Basal Sand', but are not considered to be significant. Some other, more distinctly anomalous radioactivity also occurs within the overlying Miocene Namba Formation, associated with carbonaceous clay interbeds to a carbonate unit, mostly found in its thickest (7-9 m) portion. This mineralisation is thought by Minad to have been introduced during the deposition of the enclosing lagoonal or lacustrine sediments, but it too is regarded as superficial and of no economic interest. Beyond the now drilled upper reach of the Curnamona Palaeochannel, to the south, there are indications that a number of smaller tributaries have converged to form it. No field work took place during 1977, following the partial relinquishment of 85% of the licence. In a brief later phase of exploration, the primary hardrock uranium potential of the Spring Hill prospect located in the south-east of the tenement was evaluated by a field inspection of ground surrounding some current mining leases that cover the exposed davidite occurrence. No surface indications of any extensions to the known vein-hosted mineralisation were seen, and therefore it was decided that no further uranium exploration effort could be justified.