Legacy product - no abstract available

Legacy product - no abstract available

This report deals with the results of 25,000 ft. of boring over an area of 15 sq. miles. Twenty-six coal seams were identified and named. Total reserves of all seams with band-free thickness greater than 4.0 ft. are 200,000,000 tons. Net open-cut reserves (to 9:1 ratio) of 7,500,000 tons over an area of 400 acres were tested and defined on four seams. All work in the Howick Area was done in the period March, 1952, to June, 1953.

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These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

The Brodribb deposit, located 13 miles north of the Rum Jungle mine was located by an aerial scintillometer survey in September 1952. A ground examination revealed an order of radioactivity sufficient to warrant geological and radiometric surveys. A total of 1026 feet of costeaning was bulldozed. The increase of radioactivity with little depth and the satisfactory sample values justify exploratory drilling and possibly underground development, which will be started in 1953. The information available to date places the Brodribb deposit in an entirely different geological category from that of the Rum Jungle deposit. Even if the Brodribb deposit proves to be only of very low grade uranium, an entirely new and extensive province for uranium exploration will be opened.

Manganese deposits in the Gregory Range, Western Australia were examined and mapped by officers of the Geological Survey of Western Australia and the Bureau of Mineral Resources jointly. The investigation indicated the presence of 93,000 tons of manganese ore distributed between 37 separate bodies contained in 13 groups. Numerous small bodies each containing less than 200 tons of ore have not been included in the tonnage estimate. The grade determined by chip sampling the surfaces of the outcrops is generally high. The range of composition of samples is: [see table in record]. The deposits occur as replacements of silicified bands in dolomitic limestone and as fillings of irregular cavities in the limestone. A few thin deposits in the south-eastern sector of the field overlie quartzose rocks.

The refraction seismic tests described in this report were made at the request of the Victorian Railways Department. The work was located within the railway reserve between the outskirts of Wodonga township and the River Murray, and consisted of the shooting of five refraction traverses, set out approximately parallel to the railway line and covering in detail a total length of 4,800 feet. The aim of the seismic work was two-fold. Firstly an investigation was required of the subsurface formations in the vicinity of the bridges which carry the railway across several creeks intersecting the Murray flood plain. The subsurface information is required in connection with the design of the foundations of new bridges which will be constructed to replace the existing ones. The second purpose of the work was to test whether the refraction seismic method would be suitable for adoption by the Railways Department engineers as a standard routine method for investigating foundation conditions. To fulfil this purpose ideally, the method would need to be applicable generally to all the foundation problems encountered by the Department and to completely eliminate the necessity for test drilling of sites. The flood plain of the Murray, on which the seismic measurements were made, is composed of Recent alluvium, probably underlain by Tertiary river deposits and is crossed by several creeks and anabranches of the main stream. The outcrops in the vicinity of Wodonga show the bedrock to be granite and metamorphic sediments. The field work was done between February 26th and March 12th, 1953. The field party comprised two geophysicists and three field assistants provided by the Railways Department.

In the following report thirteen rock specimens from the Soldiers Cap area are petrographically described. The specimens were sent in for examination by R.A. Searl. Fifteen specimens are listed in his covering memorandum, but only thirteen were received; specimens with Nos. 4749 and 4805 did not arrive. Some of these rocks present problems in petrogenesis. To solve these problems more detailed collections will have to be made; such collecting should preferably be done by a petrologist in co-operation with the field geologists.