Surface copper carbonate mineralization occurring along a presumed shear zone was initially discovered some 4 miles southwest of the Parabarana Cu prospect by North Flinders Mines in late 1971, during a programme of detailed geochemical stream sampling along the Paralana Fault System. Mineralization is exposed as narrow lenses, bands and pods of gossanous material, with sporadic occurrences of secondary copper and uranium minerals, over a strike length of 3,200 feet and within a width of approximately 100 feet. Surface mapping and diamond drillhole information indicates the mineralized zone to be conformable to the immediately enclosing host rocks, which comprise intercalated mica schist, schistose acid porphyries of probable rhyolitic origin, and possible impure calcareous metasediments or amphibolites. Base metal mineralization is associated with pneumatolytic and skarn-type mineral assemblages, probably related to contact metamorphism which accompanied intrusion of one or other of the granites in the vicinity. These mineral assemblages have their strongest development in the eastern portion of the prospect, where a prominent magnetic anomaly, in excess of 6500 gammas, clearly delineates the zone of most strongly introduced magnetite. However, from the limited drilling done to date, uranium and copper mineralization in this eastern part appears to be dispersed over wide intervals, in generally sub-economic concentrations. In the western portion of the prospect, surface gossans of a similar appearance to those further east appear to be related to lenses of more massive sulphides, within which the uranium and copper mineralization approaches possible ore grade, viz. local orders of magnitude of up to 2 lb U3O8 per short ton and 1.0% Cu occur within ore shoots estimated to yield 500 tons per foot of drilled depth. This western part also coincides with an area of less intensely-introduced skarn minerals such as magnetite, monazite, apatite, allanite, fluorite, etc. The mineral assemblage at Gunsight appears similar in many respects to that described from the Mary Kathleen uranium deposit near Mount Isa in northwestern Queensland, which is regarded as an example of the rare contact metasomatic variety of uranium deposits. The main differences are that the Gunsight host rocks were probably not so calc-magnesia rich as those at Mary Kathleen (diopside-scapolite granulites), while magnetite is a major component of the Gunsight skarns but hardly rates a mention in the published work on Mary Kathleen. Also, the uraninite at Gunsight is very fine-grained, and appears to be mainly associated with sulphides and sometimes monazite, whereas allanite is the principal host to uraninite at Mary Kathleen.