The Hiltaba Suite Samphire granite lies south of Whyalla on the northeastern Eyre Peninsula. Uranium exploration in the area commenced in 2007 and resulted in the discovery of sediment-hosted uranium mineralisation in Eocene paleochannels eroded into the fractionated and uranium-rich granites of the Samphire granite. Integration of exploration-generated geophysical, geological and geochemical data has enabled subdivision of the onshore part of the Samphire granite intrusion. Five increasingly fractionated granite domains are interpreted to have been sequentially emplaced in the form of an inverted cone-like body. Country rock metasomatic alteration contemporaneous with emplacement of the Samphire granite is associated with base metal anomalism. Clay-alteration extends across the top of the Samphire granite and remnants of clay-altered metasediment carapace are metal anomalous. In the Blackbush area there is a localised zone of more intense alteration with U-REE mineralisation associated block brecciation, epithermal veining and clay-alteration of the uranium-rich red granite domain.