South Australia is well recognised as being significantly enriched in uranium. During 2010–11, South Australia produced 4276 t of uranium, representing 60% of Australia’s total uranium production of 7035 t, and equating to 11% of the world’s total production of 53 663 t (World Nuclear Association, 2012). Extensive emplacement of uranium-enriched felsic igneous rocks occurred 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 occurring 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 of IOCGU mineralisation at the 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 typically 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 reassessed, 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.