Brief description of limestone from a locality half a mile north of Cape Leeuwin Lighthouse.

This report arises from an application by Tableland Tin Dredging, N.L. that tin mining be exempt, like gold mining, from taxation. A detailed examination was made of the tin-mining industry, the results of which are attached to the Report: Appendix I outlines the economic position of the Australian tin industry, and Appendix II summarises the positions of the individual mines. Since the application was first submitted, amendments to the Act have considerably improved the taxation position of mining companies. During the investigation the conclusion emerged that, notwithstanding the recent decided improvements in taxation as applied to mining, some further improvements seemed desirable. Since it was found inadvisable, on grounds of economics policy, to make a special case for the tin industry, proposals were put forward for the mining industry as a whole, using data collected from various mines as particular examples of the effects of taxation.

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.

The eastern boundary of the area (the western boundary of D.C. 22) from Peerless Avenue to Ocean Street, was bored in August, 1947. The remainder of the area was bored in April, 1948. Bore-holes were put down to water level, using post-hole digger. Samples were dried and weighed and their volumes determined. The samples were then concentrated by panning, and the weights and volumes of the concentrates were determined. The percentage composition of a composite sample of concentrates from each bore line was determined by grain counting. The data collected and the findings of the investigation, including estimates of the quantities and grades of heavy mineral concentrates, the quantities of overburden and the quantities of each of the heavy minerals, are tabulated in this report.

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

An investigation into the possibility of providing additional water supplies to the township of Tennant Creek was carried out by the Department of Works and Housing. A request was made to the Bureau in March, 1947, to carry out a geological examination of possible dam sites in the Tennant Creek area. A preliminary inspection of two possible sites was made on 5th June, and a detailed plane table survey of both sites was carried out on 6th and 7th July, 1947. The location, access, topography, general geology, engineering geology, and recommendations for future investigation and work are discussed in this report.

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