Legacy product - no abstract available

This report deals with the results of 22,355 ft. of scout boring over an area of approximately 50 square miles on the western flank of the Muswellbrook (N.S.W.) Anticline. A traverse of overlapping bore-holes, located between the outcrops of the Upper Marine Series (Mulbring Beds) in the east and of the Triassic sediments in the west; provided a more complete section of the Upper Coal Measures in this area than has been previously available. Some 46 coal seams were encountered and tentatively numbered for correlation. Some of the coal seams exhibit very good qualities, but none could be classed as a good gas or coking coal. Igneous intrusions are numerous and of a fairly wide vertical and areal extent; their influence on the associated coal seams is generally destructive. The results of the above boring may be regarded as a basis, for any detailed future underground and/or open-cut mining investigations. No attempt was made to estimate coal reserves of any kind.

This report contains the results of a seismic survey on the Nerrima Dome, a major structure within the Fitzroy Basin and near its south-western boundary. The dome is situated near the Fitzroy River about 100 miles south-east of Derby in the West Kimberley district of Western Australia. The Nerrima Dome has been mapped at the surface in Permian sediments and is a complex structure. It was desired to determine if the dome existed at depth and, if not, the structure at depth, with a view to locating a site for a deep drilling test. The target beds for such a test are Devonian and/or Ordovician sediments over which the Permian sediments are believed to lie unconformably. Reflection methods were tried and proved unsuccessful and the survey was carried out using refraction methods. Although the structure underlying the dome has not been clearly shown, the refraction method has indicated that it is complex and does not conform with the domal structure at the surface. There appears to be a major unconformity at comparatively shallow depth (2000 ft). The deep structure (7000 ft) although apparently less complex than that immediately below the unconformity, also bears no obvious relation to structure at surface. The results so far obtained are reasonably conclusive in showing that no simple dome-like structure of large magnitude exists under the Nerrima Dome.

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.

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.

This statement has been prepared as a supplement to Summary Report No. 27 - Aluminium and Bauxite - which was issued in 1946. Since that year testing of deposits in Tasmania has been completed and new discoveries of commercial bauxite have been made in northern New South Wales and the Northern Territory. Further exploration in South Gippsland has resulted in minor additions to the proved reserves of Victoria, and the presence of bauxite has been reported in Papua and New Guinea. Exploration of deposits of bauxite on the north coast of the Northern Territory is not complete but sufficient accessible reserves have been proved to change the formerly unfavourable outlook for the aluminium industry now being established in Australia. Re-examination of the formerly known deposits has necessitated recalculation of the stated reserves, and has generally resulted in a reduction of the earlier estimates, but, on the other hand, a substantial increase has been made for the Tamborine Mountain deposits in Queensland. South Gippsland tonnages have been recalculated and expressed as dry ore for the sake of greater accuracy and consistency. Tonnages throughout are long tons (2240 pounds) of dry ore. In the following tables proved reserves are those which have been systematically tested by pits or bores regularly spaced at intervals of not more than 400 feet, and in many cases only 100 feet. Indicated reserves have been tested by more widely or irregularly spaced holes.

In the search for deposits of radio-active minerals the Bureau has used scintillometer equipment mounted in a D.C.3 aircraft with considerable success in suitable country. In order to investigate the possibility of extending the application of this type of survey to mountainous country, over which the D.C.3 could not be used, tests of similar equipment mounted in a helicopter have been made over three areas in New South Wales. The areas selected were at Carcoar, Tenterfield and Broken Hill. The results of the tests indicate that a scintillometer mounted in a helicopter can be successfully used in almost any type of country. However, in areas of low relief, the D.C.3 aircraft is preferable, owing to its greater speed and to the fact that it can carry auxiliary equipment by means of which its position at any time can be accurately fixed. The helicopter will not give the rapid and complete routine coverage of large areas that is given by the D.C.3. In rugged or mountainous country where the larger aircraft cannot be used the helicopter offers great advantages over other methods of prospecting for radio-active deposits. For this work it is best operated by following flight lines related to easily identifiable map features.

Samples from three bores were submitted by the Water Conservation and Irrigation Commission, of New South Wales for micropalaeontological examination namely: 1. Bore No. 8271, K.F. Robinson's "Talyealye" property, 2. Bore no. 8290, J.T. O'Connor's "Shannon" property, Bourke, [and] 3. Bore No. 8302, J.J. Doohan, "Yarralee" property, Wanaaring. A detailed description of the microfaunal content of the samples from these bores is given below.