1952
Type of resources
Keywords
Publication year
Topics
-
In the various methods of geophysical prospecting, sensitive instruments are used on or near the surface of the earth to measure effects which arise from differences between the physical properties of rocks, ores and minerals. The analysis and interpretation of these measurements permit conclusions to be drawn concerning the sub-surface geology and the presence or absence of orebodies, coal seams, and the like, or of structures likely to be favourable to the occurrence of oil, etc. The principal physical properties of rocks which are useful in geophysical prospecting are density, elasticity, electrical conductivity, radio-conductivity and magnetic susceptibility. Aeromagnetic survey methods, their present use, and results of such surveys, are discussed in this report.
-
Samples from three bores in the Great Artesian Basin in Northern New South Wales were submitted by the Water Conservation and Irrigation Commission of New South Wales for micropalaeontological examination. These bores are: Bore No. 8256, M.E. Howe, "Retreat", Dubbo, Bore No. 8259, L. Fitzell, "Marathon", Dubbo, [and] Bore No. 8264, E.W. Robinson, "Womparley", Bourke. The results of the detailed examination of the samples are given below.
-
During 1951, Mr. E.P. George, a resident of Maldon, reported that he had discovered areas in the Maldon gold field which showed definite radioactivity on a portable Geiger counter. Samples submitted by him from time to time were tested in the laboratory, and showed slight radioactivity. Although the results gave no indication of the presence of a deposit of commercial value, the opportunity was taken of the presence of a geophysical field party in the Woodend district to pay a brief visit to Maldon, so that the activity present could be recorded on the Bureau's instruments. The party comprised two geophysicists, who spent half a day in the area.
-
The Bureau of Mineral Resources has commenced a geophysical investigation of the copper-nickel deposits in the Five-Mile district near Zeehan at the request of the Tasmanian Department of Mines, Hobart. The Department, in its Summary Report (1952) has indicated the possibility that further ore-bodies of economic value exist in the area. Therefore, the Bureau was asked to carry out a geophysical investigation of the whole area. The Department of Mines laid out the lines including cutting and pegging the traverses. The geophysical survey was begun in May, 1952, with a programme including self-potential, magnetic and electro-magnetic measurements. This interim report has been prepared to present the geophysical results obtained to date and to discuss their significance. Self-potential and magnetic results are discussed.
-
A geological survey of the Peko Gold Mine was conducted as part of the field activities of the Bureau of Mineral Resources in 1950. The objects of the survey were to study the factors localizing the ore, to suggest possibilities for the discovery of new oreshoots, and to plan a diamond drilling campaign to test these possibilities. J.F. Ivanac and B.P. Walpole mapped the geology of the mine. The plane table survey of the surface outcrops was carried out by E.M. Bennet. The results of the survey are presented in this report. History and production, general geology, economic geology, and the prospects of further discovery are discussed.
-
A total of thirteen rotary cored bores were sunk by the Bureau approximately one mile south of the village of Teralba in the Parishes of Teralba and Awaba, Northumberland County. The Great Northern Seam in places is sufficiently thick for open cut mining but the coal is generally of very poor quality and the overburden to coal ratio much too high to warrant further drilling. Continued prospecting of the Fassifern Seam in this area is not warranted, because of the very poor quality of the coal in this seam. This report contains an account of the operations, and describes the results of the geological investigations. The results of drilling are detailed in the accompanying plates and bore logs.
-
Mount Langla is one of a group of volcanoes which lies on the western end of the island of New Britain. The 3,800 feet cone is on the eastern flank of the ancient volcano, Mount Talawe and is almost due south of the wartime Gloucester airstrip. The original report concerning the signs of increasing activity was made by Father McSweeney of the Kalingi Catholic Mission. Father McSweeney was returning from a trip along the north coast on 12th May, when he noticed condensed steam rising from a new location on the summit of Mount Langla. On a visit to Borgen Bay on 30th May he saw gas bubbles in the sea close to the shoreline adjacent to the small conical hill which lies on the western side of the Bay. At the request of the Government Secretary the writer left Popondetta and flew to Lae on 18th June, and left by trawler the same day to arrive at Kalingi on 20th June. An inspection of the volcano confirmed the recent nature of the increase in gas emission and revealed a number of phenomena which are usually identified as pre-eruption conditions.
-
These documents have been scanned by the GA Library. Please refer to the document for contents.
-
The purpose of a visit to the Cloncurry district, which lasted from 21st August to 30th September, 1951, was to see what aid geophysical work could give in the search for copper deposits in this field which is one of the biggest mineral fields in Australia. While the Cloncurry district in the past produced copper from many small but rich deposits, only a few exceeded 200,000 tons, and the search now is being conducted mainly with the idea of finding and developing huge but relatively low grade copper deposits with at least several hundred thousand tons, or perhaps millions of tons of copper ore containing at least 2.5 to 5 percent copper. It is possible that geophysics might help in this search, and consequently, a number of old copper mines were visited and some geophysical test traverses made. With the rather limited facilities available the tests were confined to self-potential measurements and to a few traverses with a new Atlas gravity meter, especially suitable for ore prospecting because of its lights weight and transportability and its high sensitivity and accuracy. This report gives an account of the survey and its results.
-
Samples submitted from this bore were taken from the depth of 25 feet down to 475 feet. This report comprises a synopsis of the lithology of the samples after washing, together with notes on the samples.