1942
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The Dundurrabin copper prospect is 3.5 miles northwest of Dundurrabin sawmill and settlement, and 5 miles from Lyringham, which is connected by road to Grafton, Armidale and Dorrigo. The mine is favourably situated with regard to supplies of water and timber. Development consists of an adit to the lode with a cross-cut through it (Plate I), connected to a shaft from the surface on the south wall of the lode. The shaft has been sunk 30 feet below the adit with another cross-cut at that level through the formation. A few pits and costeans have been put down along the strike. Geology, prospects, and recommendations for further work are discussed.
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A point has been reached in the prospecting of this field where it is necessary to review results and consider future actions. The bore on site A has been completed and Mr. Knight has concluded his preliminary geological survey of the area. The information now available modifies some of our earlier views. The following statement summarises the position.
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Mount Kitchin lies about thirty miles west from Chillagoe in Northern Queensland and is 13 miles by bush-track south-west from the now deserted town site of Arbouin on Cardross copper field. Six claims embrace the mica deposits at Mount Kitchin, but only three of these could be examined, on the 8th October, 1942, in the short time at disposal. The brief examination of these three claims, namely, "Wonder", "Anniversary" and "Southern Cross" confirms the remarks of Mr C.C. Morton in his report dated 1/5/42 to the Chief Geologist, Brisbane, and it appears that the "Southern Cross" and "Anniversary" claims contain the only deposits which may become producers in the future. When compared with the mica deposits of Central Australia the pegmatite bodies at Mount Kitchin are very small.
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During July 12th-27th an initial examination and mapping of the suface and underground workings were carried out at the Great Central mine. A further examination was made of the surface of the mine on August 26th-27th. At the time of this second visit sampling had exposed fresh faces along most of the drives and crosscuts, and workings in McKenzie's and West Shafts not previously accessible were inspected.
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Geophysical methods have previously been used at Moonta by the Imperial Geophysical Experimental Survey. Owing to the uncertainty introduced by the results of the earlier tests, however, it was decided that before any extensive geophysical survey should be undertaken on the area, testing with the potential gradient, electromagnetic, self-potential and magnetic methods should be carried out. This report deals with the results of such tests which were conducted on the field between March 16th and 28th, 1942.
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Report on the facts and cost of maintaining and increasing production at the Mount Bischoff tin mine, Waratah, Tasmania.
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This report is written in advance of the main report in order that a drilling campaign to test the scheelite deposits can be considered immediately. The descriptions are necessarily brief and moreover the report is not accompanied by the full set of plates which will accompany the main report. Present values suggest that the scheelite deposits could be worked on a much larger scale than the present one. The King Island scheelite mines have been operated during two periods, the first being between 1917 and 1920, and the second from 1938 to date. During the first period 67,710 tons of ore were treated for a production of 589 tons of scheelite concentrate, the average yield of concentrate being 0.87 per cent. During the second period 98,305 tons of ore were treated for a production of 627 tons of scheelite concentrate, the average yield on concentrate being 0.64 per cent. In addition and during the latter period 41,260 tons of tailings were re-treated for a production of 52 tons of scheelite concentrate, the average yield being 0.12 per cent. The mine is being worked at present and some 30,000 tons of ore are treated annually for a recovery of 200 tons of scheelite concentrate.
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Two reports on the Costerfield Gold-Antimony veins have been published. Bulletin No. 50 of the Victorian Geological Survey, by H.S. Whitelaw gives an account of the lodes and workings and of the history of the mine. An excellent description of the reefs and the mineralisation by Dr. F.L. Stillwell appeared in the proceedings of the Australasian Institute of Mining and Metallurgy, New Series, No. 48, 1922. In view of the existence of these publications, repetition of the details of Costerfield history, workings and geological features is avoided as much as possible in this report, and they are merely summarised in order to present the essential facts concerning the mineralised system.
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The relevant portions of letters from Non-Metallics Limited addressed to Mr. J.M. Newman, setting out the reasons for their Application for a Commonwealth Grant, and the details of the Company's position are reproduced here.
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This report deals with the results of a geophysical test survey which was carried out in the vicinity of the Burra mine between March 4th and 13th, 1942.