The Honeymoon uranium deposit lies within a Cainozoic fluvial sandstone unit, and occurs in close proximity to a buried, uraniferous granite body. The uraniferous granite is part of a geophysically-defined suite of buried acid intrusive rocks occurring within the Curnamona Province of South Australia that are known as 'Honeymoon-type granites'. A recent PACE Initiative - subsidised company diamond drillhole has sampled one of these granites, which contains uranium concentrations of up to 78 ppm, with typical values ranging between 10 and 48 ppm U. The granite is a non-magnetic, undeformed two-mica leucogranite, of an as yet unknown but inferred Mesoproterozoic age. Petrographic observations made on drillhole samples of the granite disclosed that sodic, sericitic and potassic alteration processes have affected it. Chlorite and salt-rich zones were also observed in the most strongly sericite-altered parts. Oxidation noted adjacent to fractures is presumably related to deep weathering and fluid flow. Most significantly, scanning electron microscope mineralogical analyses have shown that un-altered or weakly altered granite samples still preserve within them significant amounts of uranium-rich phosphate accessory minerals, often associated with sulphides, principally pyrite. While some phosphates are also present in highly altered zones in the granite, their abundance is greatly diminished, and in no instances have they been observed to contain measurable quantities of uranium or other rare earth elements (REE). Geochemical evidence for variable REE mobility, including the tetrad effect and low L (light) REE/H (heavy) REE ratios [(La/Yb) = 1.99-4.78], suggests that LREE were significantly more mobile during hydrothermal alteration than were HREE. Certainly uranium and other REE species became very mobile during the hydrothermal alteration of this granite, and the abundance of fluid pathways such as fracture zones means that deeply circulating ?meteoric or basinal fluids could potentially have scavenged these elements. However, the temporal relationship between the hydrothermal alteration observed in the Honeymoon-type granite and the Cainozoic precipitation of uranium in the overlying Yarramba Palaeochannel sands remains uncertain. Future work should focus on constraining the absolute timing of alteration in the granite, along with making a thorough study of the physical characteristics of the alteration-related fluids, to help constrain the relationship between the uraniferous basement and the Cainozoic sandstone-hosted uranium deposit existing nearby.