Findings from a micro-examination of samples taken from the depths of 2,110 feet down to 3,533 feet 11 inches. The series is in continuation of that reported upon 11/10/44.

A preliminary geological examination of an area at the northern extremity of Gungahlin district was carried out for the purpose of determining with fair approximation the area occupied by slate apparently suitable for brick-making. The geology of the area and the suitability of the site for a brick pit are discussed in this report. A geological sketch map of the district is included.

The Pilot Bore is situated 130 feet north of the Lakes Entrance Shaft and 80 feet above mean tide level. The principal purpose of the bore was to provide information on the position and flow of aquifers and on the nature of the rock ahead of shaft sinking operations. Percussion drilling was used to ensure that information on water horizons should be as accurate as possible. This report summarises the information so far obtained from the Pilot Bore, Lakes Entrance, and should be regarded as an interim statement pending the completion of work on the cores. The task of correlating this information with that obtained from other sources and the discussion of its bearing on regional problems are reserved for a more detailed report when the work has been concluded.

The work described in this report forms part of the uranium investigation being conducted by the Commonwealth Government for the British Government. 94 samples from the Radium Hill workings, S.A., were submitted to the Mineral Resources Survey for determination of relative radioactivity, with a view to making estimates of their uranium content. After determinations were made a suite of these samples was selected and submitted for assay for uranium and thorium by the South Australian School of Mines. This report comprises a description of the equipment, procedure and calibration, along with a discussion of the specific problems associated with the ore, the random variations in count-rate, and the results of tests of the ore samples.

The work described in this report forms part of the uranium investigation being conducted by the Commonwealth Government for the British Government. The work was carried out at Mt. Painter from 7th February to 26th March, 1945, following prior geophysical work. This report covers work including setting up and calibrating the assay equipment, and testing 100 samples from the Mount Painter No. 6 workings and 12 samples from East Painter No. 1 adit. In addition, some field work was carried out on Radium Ridge using a new type of portable equipment. The report is divided into two parts, the first dealing with the assay work and the second with the field work.

A report was prepared in December, 1944, on the ore reserve position at the Mount Bischoff Tin Mine. Since that date, further field work has been carried out, and the additional observations made have rendered necessary a revision of conclusions advanced in that report. The present report is to be read as a supplement to the previous one, but supercedes it in many respects. A revised summary of the ore reserve position is given herein. The additional geological observations affect both the interpretation of the structure of the Mount Bischoff ore-body as a whole, and the interpretation of the structure of individual ore occurrences.

The pressure of the liquid, or reservoir pressure, within the glauconitic sandstone at Lakes Entrance has been the subject of conjecture in recent years and the low yields of oil which typify the field have been attributed by some observers to low reservoir pressure. Reservoir pressure, however, is only one of a number of factors upon which the rate of yield depends. Other factors of equal importance are the permeability of the producing formations and viscosity of the fluids produced. The methods, tests, and results involved with the determination of reservoir pressure from liquid level data are discussed in this report.

Results of a micropalaeontological examination of samples from a depth of 50 feet down to 1000 feet.

The Pannikin Mine is situated on the south side of the Hart's Range about 7 miles southeast of Mount Riddock and about 9 or 10 miles a little south of east from Schaber's homestead. The Elbow deposit is about 1 1/2 miles south-southwest from the Pannikin. The two deposits, and another smaller one in the same locality, were visited on 22nd October, 1944. The accompanying plan of the Pannikin was made with compass and tape. The report comprises notes on the two mica deposits. Accompanying sketch plans of the Pannikin and Elbow deposits are included.

Four core samples were submitted by New Occidental Gold Mines N.L. on 4th December, 1944. The descriptions of the samples that follow are based on a brief megascopic examination of the cores by H.B. Owen, Geologist of the Mineral Resources Survey. The results of tests for magnetic orientation and susceptibility are described.