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Towards the end of 1950, the deep bore which the Shell Development Company was drilling to test for oil on the Morella structure, 35 miles south of Rolleston, entered andesite at approximately 4000 ft. After boring about 200 ft into the andesite, the Company decided to abandon the hole. A new site for a test bore was selected on the Comet anticlinal structure, 60 miles north of Rolleston. Before proceeding with this new test, evidence was needed to ensure that neither a shallow basement nor volcanic rocks existed under this structure. The Bureau was therefore asked to shoot a refraction traverse over the anticline, in order to determine if basement rocks were likely to be present at a shallow depth. As a result the Bureau sent a seismic party to the area during January 1951. Fairly definite evidence was obtained of basement velocities occurring at a depth of less than 3000 ft, and after discussions, a decision was made not to proceed with the drilling of the Comet structure. The results have now been investigated in detail and are presented in this report.

Field work at Rum Jungle commenced on 18th May and terminated 15th November. The greater part of the field season was spent in detailed geological and geophysical examination and testing of White's Deposit, Dyson's Find, Mt. Fitch Radioactive Area, Brown's Workings, and Brown's Extended. The results of these investigations are summarised in this report.

Mount Hope, a small town in Central New South Wales, is south of and 101 miles by main road from Cobar, and 11 miles north of Matakana siding on the Sydney-Broken Hill railway line. The ores mined in the Mount Hope district have been mainly those of copper, the principal mines being the Mount Hope mine, close to the town, and the Great Central and Comet mines, three miles further south. At present, the only mine in production is the Mount Hope mine, where the leaching process is being used by the Caroline Copper Mines. At the request of North Broken Hill Ltd., geophysical surveys were carried out on two areas: the Mount Hope mine area, and the Comet Mine area. The field work was commenced in May, 1950, and occupied three months. This report gives an account of the geophysical surveys and their results.

A micropalaeontological examination was conducted on a sample of diatomite from Redesdale. The results of this examination are described here.

This report is a detailed stratigraphical and structural study of an area of some 40 square miles south-east of Cobar together with a geological reconnaissance of an area of 500 square miles in the Cobar-Canbelego district. The purpose of these investigations was the elucidation of the general geology and the problem of ore localisation in the Cobar-Nymagee-Canbelego metalliferous province.

A sample of limestone from Bougainville was submitted for micropalaeontological examination. The results of this examination are described here.

The purpose of the investigation was to determine the degree of uniformity of the earth's magnetic field over the existing and the alternate compass swinging sites for ground swinging of aircraft. Field work was carried out on 30/1/51 and 5/2/51. Instruments used were the Vertical Force Variometer and the Wingfield Compass. The report gives an account of the field work and the results of the survey.

This report contains the results of brief geological investigations carried out in conjunction with the Land Research and Regional Survey Unit to provide information on land types and their distribution in the Burdekin River Valley. A geological map and sections at the horizontal scale of 4 miles to 1 inch have been compiled from air-photo interpretation controlled by widely spaced land traverses. An account of the stratigraphy is given, and palaeontological reports on the fossils collected appear as appendices.

This report describes the results of a micropalaeontological examination of samples from bore No. 8253. Results are given for samples taken from the depth of 50 to 1000 feet down.