Results of a microexamination of samples taken from a depth of 5 feet down to 147 feet.

Results of a micropalaeontological examination of rock samples taken from various sites in the vicinities of the Desert and Bonaparte Gulf Basins.

This geophysical survey was undertaken as part of a campaign by the N.S.W. Mines Department and the Commonwealth Bureau of Mineral Resources to explore the ore possibilities of the Cobar Mining Field. Tests, made in January 1947, on specimens of ore from the operating mines showed that some of the ore from the New Cobar and Chesney Mines exhibited appreciable magnetisation due to its pyrrhotite and possibly magnetite content. The survey was commenced in March, 1947 using the magnetic method only as a first method of attack. Watts Vertical Force Variometers Nos. 15887 and 16128 were used, the field work being carried out by the writers. The geology of the area, object of the survey, results, and recommendations for future drilling are discussed in this report. Two accompanying plans are included.

Collie is the only developed coalfield in Western Australia. Between June 1946 and April 1947 a comprehensive geological and geophysical survey was carried out to determine the boundary of the basin, its general configuration and the depth (thickness) of the sediments overlying the basement. The aim of the survey was to define those areas where there was sufficient thickness of sediments to enable drilling to be carried out with a reasonable expectation of proving additional reserves of coal. The geology of the area, application of the gravity method, results and interpretations, and drilling recommendations are discussed in this report.

This report is compiled in two parts. Part A provides a description of samples taken from a depth of 108 feet down to 7299 feet. Part B comprises notes on the stratigraphic sequence of the Nelson Bore.

The material submitted for examination came from 35 bores which were drilled in the Adelaide Plains during 1945 and 1946. For comparative purposes, material has also been examined from several bores previously drilled in the area. The bores were sunk for water and the area drilled extended from Bore No. 69 at Royal Park northwest of Adelaide, to Nathan Brewery Bore on the Torrens River. The bores range in depth from 160 to 620 feet. This report comprises descriptions of stratigraphic sequence, fossil fauna, and the structure of the Adelaide Basin, with reference to the material examined. Two accompanying plans are included.

Approximately fifteen shafts were sunk near the eastern end of the Portion to depths of about 30 feet or more. The shafts were sunk from positions along the boundaries of a right-angled triangle with the east-west zero line for base, the 200E meridian for perpendicular, and the hypotenuse formed by the diagonal from 00/600W to 800N/200E. Two or three shafts have been sunk outside the triangle and none near the centre. This work has served to test thoroughly an area of not less than 400,000 square feet, equivalent to about 25,000 tons per vertical foot. The results of the work to date are discussed in this report.

Overview of general work, staff involvement, drafting, field work and laboratory work carried out for the month of October, 1947.

Overview of staff involvement and general, field and laboratory work carried out during the month of August, 1947.

Overview of staff involvement and the general tasks, field work, and drafting carried out during November, 1947.