The sources of previously reported noteworthy radiometric anomalies located near Old Boolcoomata Homestead, which had been detected in 1962 during a SADME/BMR aerial scintiilometer survey, were investigated by the present joint venturers along with apparently similar host rocks that are distributed across a wider surrounding licence area. The exploration target was primary uranium ore formed within Willyama Complex schists. The process of ground checking 19 aerial radiometric anomalies included performing detailed geological mapping at a scale of 1:1200 across a selected 10 square mile area to the west of Kalabity Homestead, as well as conducting ground radioactivity surveys over the RA3, GK1 and GK4 prospects, drilling 3 scout percussion holes (total 298 feet) during February 1969 at the RA3 prospect, and drilling 2 diamond holes during November 1969 at the GK1 prospect and also completing extensive trenching there during December 1969. Some semi-regional geological mapping was also carried out, in the region west of Kalabity and in the Old Boolcoomata - Lady Louise - Mount Mulga areas. The results of all this work have downgraded the licence's perceived prospectivity for discovering large uranium deposits, as most of the primary uranium mineralisation found (monazite, brannerite and davidite) appears to be of a minor, disseminated vein style which is pegmatite or fracture zone - related. During December 1968, an airborne spectrometer survey was conducted over two selected areas, using an advanced digital gamma ray spectrometer to record multichannel radiometric responses over both exposed bedrock and expanses of alluvial and eluvial cover. East-west flight lines spaced 0.5 miles apart were surveyed at a mean flight elevation of 400 feet above the terrain. Field checking of 7 resulting uranium channel anomalies seen in the Kalabity area led to the discovery of a significant deposit of radioactive minerals present within schistose rocks outcropping 5.5 miles north-west of Kalabity Homestead. Detailed, 1:480 scale geological mapping and radioactivity profiling at 100 feet intervals was undertaken over this GK-1 prospect, plus the drilling of two inclined exploratory diamond drillholes for a total penetration of 945 feet, as well as gridding and the sampling of 1022 feet length of shallowly dug exploratory trenches. The principal radioactive mineral present is monazite, with lesser carnotite, brannerite and phosphouranylite, occurring mainly as patchy small segregations within a metasomatically silica-pyrite altered andalusite schist containing sericite, phlogopite, rutile and tourmaline. No obvious uranium-bearing mineral could be identified from laboratory thin and polished section examinations and instrumental scans of the surface and drill core rock samples provided. The drilling showed that the metasomatised zone, which dips and flattens eastwards, has a true thickness of only 45 feet, and although still mineralised at a vertical depth of 100 feet, it does not appear to be of substantial size nor with high enough concentration of monazite to be considered economic. It is cut by an east-west orientated steep fault or shear which is thought to be the control on emplacement of the monazite in narrow mica veins, and various models for ways in which the mineralisation could have been introduced and distributed are offered. During August 1969, an airborne combined spectrometer and magnetometer survey was carried out over the whole of SML 209 along east-west flight lines spaced approximately 0.25 miles apart. Several prominent uranium channel anomalies, total count anomalies, and some of the higher thorium channel anomalies detected, were selected for ground follow-up. Another six occurrences of radioactive mineralisation were discovered, but only one, the GK4 prospect lying just west of the Kalabity woolshed, showed any promise of being economic. All six occurrences were geologically mapped and radiometrically surveyed. However, a close inspection of the GK4 uranium anomaly made during January 1970 found only secondary surface coatings of fluorescent radioactive silica on fractures developed at the contact between aplitic granite and chiastolite schist. Low uranium assay values for samples taken from the siliceous zone led to the conclusion that the anomalous total count radiation observed is probably due mainly to thorium and its radioactive decay daughter products, plus a small gamma ray contribution from bismuth-214, a decay element in the uranium-238 series.