The Radium Hill uranium mine is situated in eastern South Australia, 90 km west-southwest from Broken Hill. Production of radium prior to World War I was followed by uranium production from 1954 to 1961. During this latter period 974,732 tons of ore were mined at an average grade of 2.62 lbs U3O8 per ton, and 1,878,547 lbs U3O8 were recovered. The dimensions (length-depth-width) of the main orebody are 4500 x 650 x 4 feet. This orebody (including mined tonnage, plus measured, indicated and inferred reserves) amounts to 3,750,000 lbs at an average grade of 2.4 lbs U3O8 per ton. The ore reserves are contained in several ore shoots. The Radium Hill orebodies occur in north-easterly trending shears and fractures which cut high grade, completely deformed basement paragneisses of presumed Lower Proterozoic age. These paragneisses are overlain by Upper Proterozoic clastic and also fluvioglacial low grade metasediments. Regional retrogression has affected all of these lithologies. Davidite, a U and La - bearing titanate of iron, is the ore mineral. It contains up to 9% U3O8 and 7% rare earth oxides. According to petrologist Alan Whittle, the formation of biotite-chlorite-sericite-quartz shears was followed by Fe and Ti metalization. Further shearing and intrusion of soda aplite and rare earth pegmatites followed, preceding deposition of uranium. Minor sulphide mineralisation and quartz-calcite veining were the final stages in the paragenesis. The lodes can be grouped into three main systems, the Mine, South Hill and Valley lodes. The total strike length of known lode fractures is over 7000 m, of which 1400 m were mined. All of the known lodes were located by their surface radiometric expression. Good potential exists, on the basis of evidence presented in previous reports and gained by the author's recent field mapping, for locating further Radium Hill - type orebodies, but many similar sized occurrences would now be needed in order to be viable.