This report is Phase 1 of a management plan for the 'Radium Hill Mine Site and Low-Level Radioactive Waste Repository', and is essentially a preliminary investigation to establish a greater understanding of the characteristics of the site. Phase II will follow on from the Phase 1 study and will be directed to a more detailed site characterisation incorporating additional studies and investigations. This will enable effective and informed decision-making on the future management of the site, and of the various remediation methods and options available. Phase 3 will see the development of an appropriate long-term management plan for the site. This is a companion report to a similar report prepared for the former Port Pirie uranium treatment plant, and summarises a substantial amount of available information related to the Radium Hill mine and low-level radioactive waste repository. The Radium Hill area was first mined in the early 20th century for radium, however these early attempts were largely unsuccessful, and it was not until 1954 that a full-scale mining operation was initiated to produce uranium. The full-scale operation was commissioned and operated by the South Australian Government to satisfy a contract signed by the Commonwealth and state government with the UK-USA Combined Development Agency for delivery of uranium over a seven-year period. After completion of the contract to supply uranium ore, the mine was decommissioned in 1961-62 and rehabilitated to the standard of the day. At the time, this included removing much of the infrastructure and sealing the underground workings, but it did not include the covering or armouring of the main tailings impoundment or waste-rock dumps. Over subsequent years (until 1981) material from the impoundment was dispersed over an area, largely to the south and south-east, through the agencies of both rainfall erosion and wind deflation. In 1981, the decision was made to cover these impoundments with local soil material, and in the same year establish a low-level radioactive waste repository within the impoundment. Since 1998, no further low-level radioactive waste has been added to the low-level radioactive waste repository and, together with further recommendations from the EPA that the site would not meet current engineering standards, it is considered unlikely that the repository will see the burial of more material. The mine itself is located in an isolated semi-arid region of South Australia, and other than during visits by Primary Industries and Resources South Australia (PIRSA) staff, property personnel and members of the Radium Hill Historical Association, the site is rarely frequented. This report completes Phase 1 of the overall management plan by providing a preliminary characterisation and conceptual model of the site, and includes: 1) consolidation of a considerable amount of site-related information and, where necessary and applicable, verifying and crosschecking this same information; 2) supply of background data and assessment of the potential radiological exposure to humans and the environment; 3) presentation of a preliminary 'risk assessment' based on selected scenarios relative to the radiological environment of the site; 4) determination of data deficiencies and gaps and, where necessary, recommending further information and data required in order to progress to Phase 2 of the management plan; and 5) provision of initial recommendations on current management strategies and initiatives where appropriate.