Possible economic epithermal/hydrothermal uranium and base metal deposits hosted by Early to Middle Proterozoic meta-igneous and metasedimentary basement rocks in the northern Peake and Denison Ranges were the primary targets addressed by CRA in their exploration of the Denison, Algebuckina and Margaret inliers; potential gold and diamond occurrences were secondary objectives. Exploration proceeded via the initial processing and interpretation of previously untouched data from aerial radiometric surveys flown for Ashton Mining in 1981 and BHP Minerals in 1983, combined for geophysical overview with other past airborne survey data acquired by Stockdale and CRA themselves. In addition CRA acquired some further airborne magnetic / radiometric coverage (880 square km, 300 m N-S line spacing, 80 m flight elevation) to complete a full covearage of its licence area. The resulting aerial radiometric uranium channel anomalies were then checked by helicopter-borne radiometrics and on-ground inspection. The most frequently occurring anomalies, originating near the base of the Cadlareena Volcanics, are interpreted as arising from an elevated background uranium content of 35-55 ppm U in certain haematite-quartz veined layers of basic volcanics. The highest amplitude uranium anomaly seen, to 600 counts per second or seven times background, coincides with a restricted outcrop of calcrete formed within 200 m of an exposure of the Wirriecurrie Granite. Four dipolar aeromagnetic anomalies detected in CRA's 1991 survey were prospected for their kimberlite intrusion potential, but the sources were attributed instead to amphibole-plagioclase gneiss, amphibolite, dolerite and basic schist. Geological mapping and rock chip sampling of known copper anomalies at Coppertop Hill in the Denison Inlier indicated that they are caused by minor quartz-carbonate-malachite veining in basalt. A detailed 10 x 15 km gravity survey conducted over an anomalous magnetic and gravity feature at the Spring Hill locality on ELs 1720 and 1756 revealed a 2.5 km wide, 3 mGal gravity high which is interpreted as being due to a shallowly buried block of quartzite breccia and basalt-dolerite basement rock, and not to any mass of dense Olympic Dam - style base metal mineralisation concealed under surrounding Cretaceous-Jurassic sedimentary cover. Ground magnetic and gravity traverses and soil geochemistry recorded over a negative magnetic feature noted within the Skillogalee Dolomite failed to resolve the presence of any significant stratabound target.