After one of E-Z's Beltana-based field parties discovered some high radioactivity associated with copper mineralisation in old mine workings in the Arrowie Gorge area during early 1968, six mineral claims were taken out to secure the area of interest and to allow more detailed investigations, the results of which are reported herein. Surface and limited underground geological mapping and radiometric surveys have now been carried out on the E-Z mineral claims, the former being completed at 1:1200 scale, or at finer scales where warranted. Local strata and structures were examined for indications of uraniferous mineralisation, without success, despite a chemical analysis of some of the most radioactive secondary copper - rich material exposed in shallow mine workings on MC 5277 yielding assay values of up to 1300 ppm U3O8. It was found that lesser anomalous uranium values, together with elevated amounts of other trace metals (Cu, Zn), occur in lateritic / ?gossanous iron-manganese cappings formed along strike-faults, in both the Parachilna Formation and the overlying Wilkawillina Limestone. Although these observations were regarded as being unfavourable for locating any buried mineralised bodies containing high concentrations of uranium, it was decided to carry out a limited programme of slim-hole rotary-percussion drilling to probe beneath the anomalous localities. Eight vertical rotary/percussion drillholes totalling 917.5 feet were drilled during September 1969 on Mineral Claims 5275 and 5277 to test for mineralisation within the Parachilna Formation, with most holes then bottoming 10-15 feet into the underlying Pound Quartzite before being stopped by high groundwater influx. Assaying of selected drill samples gave maximum values of 77 ppm U and 9200 ppm Cu, and based on this result it was decided that the uranium must have become dispersed with secondary copper minerals from a primary source of mineralisation which was not located: this source may occur along an interpreted south side - up, north-west trending fault with an apparent dip of 75 degrees northwards, that is seen to lie at the northern end of the MC 5277 drilled section. A single hole, AG8, that was drilled 100 feet into the Parachilna Formation on MC 5275 near the Mount John Fault, showed that supergene uranium anomalies are associated with the Fe-Mn rich lateritic capping down to a depth of 15-20 feet only. Due to the extremely rugged local terrain posing problems for access with a diamond drillrig to attempt deeper drilling, and the inferred probable low grade and small reserve tonnage of the primary Cu-U deposit, it was decided to not continue with further exploration work.