Detailed geological mapping at the Parabarana Cu prospect, and between Parabarana and the Gunsight Cu/U prospect of North Flinders Mines Ltd in the northern Flinders Ranges of South Australia, has been completed.A major ENE trending fault, the Paralana Fault, separates Terrapinna Gneiss to the north from acid volcanics and intrusive granite of the Mount Neil area to the south. The Gunsight prospect occurs in a narrow band of semi-pelitic schist within the Terrapinna Gneiss, and is structurally unrelated to the copper mineralisation at Parabarana.Disseminated copper mineralisation at the Parabarana prospect is associated with the intrusion of the porphyritic Mount Neill Granite, and has been remobilised so that it is now largely confined to intensely fractured granite and chloritic shear zones south of and parallel to the Paralana Fault. From a detailed study of the surface geology, re-examination of drill cores and a compilation of assay results, the authors consider that further testing of this prosect is unwarranted because:1. The known mineralisation is of small size and relatively low grade, and is unlikely to be substantially extended by further drilling.2. The irregular localisation of disseminated mineralisation in shear zones does not provide adequate drilling targets.3. IP surveys have outlined the zone of most intense shearing and resulting anomalies have been adequately tested, thereby eliminating further drilling targets west of the main Parabarana prospect.