The accompanying resume of current knowledge of ironstone deposits in the Central Province has been prepared for general distribution. It is based on recent field work, and supersedes that previously recorded by the writer in Summary Report, RB 51/149, of December 1960. Some additional data are recorded in Departmental files and are available for inspection, but all of the essential information is here presented. The Department has diamond drilled Mount Christie, Fingerpost Hill and George Hill, and has mapped in detail these and some other deposits. Metallurgical work has been carried out by Amdel on samples from Mount Christie and Wilgena Hill submitted by the Department. Samples are also available from West Well and Muckanippie. Some prospects, notably the Muckanippie Group and Wilgena Hill, require detailed mapping. All will be covered by the one-mile mapping now in progress, and ground geophysical surveys will be carried out where necessary as opportunity permits. The Department actively assists investigations and development of all such deposits. This report is divided into two sections, numbered decimally to facilitate reference. Reserves for prospects not mapped or drilled are somewhat less definite than for those investigated in detail; in all cases the data used in calculations are presented. Ore grades, except for Mount Christie, are based on careful surface sampling. At Mount Christie, a comparison of diamond drill core and surface sample results suggests that there is considerable surface enrichment.