The gravity survey covered by this report was undertaken at the request of the South Australian Department of Mines as part of the investigation of a proposed reservoir site ay Myponga, South Australia. Myponga is about 40 miles south of Adelaide and the proposed reservoir would serve Yankalilla and other neighbouring towns which at present have no reticulated water supply. The geology of the area, method and operations, results of the survey, and interpretations are discussed in this report. Two plans, one of the gravity survey, and one showing surface and gravity profiles, are included in this report.

This report describes the fossils collected by D.M. Traves early in 1948 from the Barkly Tableland and adjacent areas in Queensland and the Northern Territory. The sequence of Cambrian faunas as far as it can be recognised in the present collection corresponds to the revised sequence given by F.W. Whitehouse in "The Cambrian Faunas of North-East Australia". This report comprises stratigraphical and palaeontological notes, and a preliminary list of fossils with notes on the lithology of the rocks in which they occur.

In the Preliminary Report on Cambrian Fossils (1948/073) collected in the Northern Territory, locality B.68, 20.4 miles west of Djarra, was placed among the localities with the western development of the Middle Cambrian Xystridura-fauna. Mr. P.B. Nye has drawn the writer's attention to the fact that the Djarra locality is in Queensland 90 miles east from the Northern Territory border; i.e. far away from those localities with a typical "western fauna" and near those with an "eastern fauna". A re-examination of the fossils and palaeogeographical interpretation of the locality near Djarra therefore becomes necessary.

This report was prepared by the Mineral Economics Section. Part 1 deals with the production of opal and includes sections on the history and present operations in the industry, production and overseas trade statistics, and the types of mining tenures at present available to opal miners. The fields at present being worked are described and the factors which affect production are discussed. Part 2 deals with the marketing of opal and includes sections on the cutting and preparation of stone, markets at home and abroad, and the various factors affecting trade. A number of proposals for improving trade and trading conditions generally are discussed, and the report concludes with a list of references in literature, two graphs showing the value of opal produced in each State and the whole of Australia, from 1890 to 1947, and a map of Australia showing localities mentioned in the text.

Systematic testing of South Stradbroke Island was started on 5th January, 1948. The boring and concentrating of samples were carried out by Associated Minerals Pty. Ltd., Southport. Sitting, levelling and mapping of boreholes was carried out by the Bureau of Mineral Resources. Between January and June, boring was directed towards the high active dunes adjacent to the east coast, and the areas of fixed, vegetated dunes west of the active dunes. The results of the testing work are recorded in this report. The occurrence of heavy minerals has been tabulated. Eight accompanying locality, section, and contour plans are included.

This account of the micropalaeontological examination of samples is presented as a preliminary report. The samples examined were taken from the surface down to the depth of 1,130 feet. The bore is being drilled by percussion methods and consequently there is some admixture of fossil species. However, towards the lower part of the bore, these adventitious species disappear and the species recorded are characteristic of the beds in which they are found.

The second drill hole on the area of the Dapville No. 1 anomaly has been completed and some details of the results are given in this report. Following the discovery of this and other magnetic anomalies of low intensity in the course of surveying, there is a need for the determination of priority on the part of the operating company, in the testing of these anomalies. The principal purpose of this report is to draw further attention to the Peak magnetic anomaly and to discuss various factors which the company may desire to take into consideration in the determination of the priority question mentioned above.

This report describes the results of a micropalaeontological examination of samples recovered from the depth of 200-250 feet from Bondsprings station.

This report describes the results of the micropalaeontological examination of five rock specimens from the Kimberley Basin.

This report describes the results of a micropalaeontological examination of thirty-one rock samples collected from the Andamooka and Coober Pedy opal fields.