Legacy product - no abstract available

As a result of a suggestion that electric logging might be employed successfully in coal exploration, a Geophysicist from Melbourne visited Field Headquarters, Muswellbrook and ran electric logs in holes which are being drilled in this district. The equipment consisted of a Widco Logger with one movable electrode capable of measuring Resistivity to a depth of 500 feet. An adaption has been made to this equipment to enable Self Potential to be measured. The details of work done are listed in Table 1 and the results of the logging as compared with the usual method of core-logging are summarized briefly hereunder.

Widespread use of radio-active tracer elements in medicine, and the increased interest in the search for radio-active minerals, have led to the development of a variety of instruments for the detection of ionising radiations, and their general use by scientists who may have had no training in physics or electronics. While these instruments present a great diversity in appearance, the functioning depends on general principles which apply to all such equipment. The aim of these notes is to present these general principles in a simple form. For details of design, which are often highly complex, and require great skill and experience, reference should be made to the works listed in the bibliography.

A request was received in December, 1951, from the Director of Ordnance and Underwater Weapons of the Department of the Navy for assistance in selecting an area suitable for the electrical balance testing of the pistol-firing rod unit of the torpedo. It was desired that this site should be at the R.A.N. Torpedo Establishment at Neutral Bay, Sydney, New South Wales. The only condition laid down in the relevant specification is that "the rod may be supported in a suitable wooden structure or in such other manner provided that the complete rod unit is not less than ten feet from any ferro-magnetic materials". In order to arrive at a more specific definition of the requirements for the testing site, the problem was discussed with the Chief Superintendent and officers of the Torpedo Establishment. The appropriate test specifications were consulted and a series of measurements were carried out to determine the actual requirements. The magnetic investigations described in this report were carried out in August, 1952, and the overall results and conclusions were communicated verbally at that time to the officers concerned.

The two samples submitted for micropalaeontological examination, came from the depths of 290 feet and 320 feet respectively. They consisted of hard, grey, carbonaceous shale. Crushings of the rocks yielded a small assemblage of arenaceous foraminifera and pyritic casts of ostracoda of Permian age. A list of the forms in each sample is as follows.

Legacy product - no abstract available

This glossary gives a brief description of the more important sedimentary rocks. Composition percentages are tentative in nearly all cases. The terms listed are classified as follows.

Legacy product - no abstract available

Madigan's uranium prospect is situated in a Lower Proterozoic sequence of interbedded sandy shales, sandstone and grits. It is located near the headwaters of the Charlotte River, near the crest and on the eastern side of a northerly trending ridge. Detailed geological and radiometric surveys were carried out and significant radioactivity was outlined over an area of approximately 300 feet by 400 feet. Some channel sampling was done over 50 feet in the zone of highest radioactivity. The greatest radioactivity appears to be associated with hematitic material occurring sporadically in a system of flat joints in a grit bed. Some fluorescent minerals were observed in this material.

The prospect was a second order anomaly located by the Airborne Scintillometer Survey of 1952. After preliminary ground investigation, a survey grid was set out by the geophysical section. The base line runs east-west for 800 feet. The traverse lines are spaced 100 feet apart and pegged at intervals of 100 feet. The detailed radioactive coverage constituted the main survey. Plate 1 shows the results of this survey. Area No. 2 was the first located and the grid was laid out with the outlining of this area in view. As work progressed area 1 was discovered and later area 3. Time did not allow the grid to be extended to indicate clearly the third area. A detailed magnetic survey supplemented the geiger work. The results are shown on Plate 2. The work commenced in July and was completed in September, 1953.