South Australia is well recognised as being significantly enriched in uranium. During 2008/2009, South Australia produced 4 613 t of uranium, representing 45% of Australia's total uranium production of 10 311 t, and equating to 9.5% of the world's total production of 48 510 t. Extensive emplacement of uranium-enriched felsic igneous rocks occurred in South Australia during the Mesoproterozoic, and to a lesser extent during the Palaeoproterozoic. These igneous rocks are either spatially or genetically directly related to various uranium deposits throughout the state, or have provided a distal source of uranium for translocation and secondary enrichment, e.g. into palaeochannel-hosted deposits or fault-controlled mineralisation formed in older rocks. A variety of uranium deposit or occurrence types occur throughout South Australia, including sediment-hosted, breccia-related and vein-hosted. Significant potential exists in some areas for discoveries of previously unrecognised deposit styles. For example, the Benagerie Ridge in the Curnamona Province is considered prospective for IOCG(±U) type deposits. Recent discoveries of palaeochannel-hosted mineralisation at the Blackbush prospect in the Pirie Basin, and IOCGU mineralisation at Hillside prospect on the south-eastern margin of the Gawler Craton, have highlighted the potential prospectivity of previously unexplored regions of the state. Uranium deposits have conventionally been described using the OECD/NEA and IAEA - derived classification scheme of fifteen deposit types, which is based on their host rock type and geological setting (McKay and Miezitis, 2001). More recently, Skirrow et al. (2009) proposed a revised classification scheme utilising the 'mineral systems' approach, whereby entire ore-forming systems are described, at multiple scales, rather than focussing on deposit-scale properties. Using this process-driven classification scheme, all known uranium occurrences in South Australia have been re-assessed, with new classifications being outlined in this report. In reclassifying each known uranium occurrence, the fluid type(s) and mineral system processes that are interpreted to have resulted in its development have been taken into consideration. As more evidence becomes available, some revision of these preliminary category assignments is expected.