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Wauchope wolfram field* is situated 260 miles by road north of Alice Springs, Northern Territory. Wolfram occurs in a series of quartz reefs the series is traceable over a strike-length of 3,000ft and the reefs are 6in. to i8in. thick. The main production has come from three reefs 12in. to 18in. thick. The field was discovered in 1917 and, from then until 1941, the deposits were worked at such times as tungsten prices were favourable (Fig. 2). Most of the mining was done on tributing basis, and the exploitation of the field was rather unsystematic. Production during that time was approximately 1,000 tons} of concentrate, obtained from an estimated 10,000 tons of quartz mined. Mining had ceased when the Commonwealth Government took over the field in April, 1942, and there were no accessible working faces. Employing Chinese labour, the Government drove 2,800ft. of exploratory and developmental adits, drives, and rises and stoped a small amount of ore. Five drill holes aggregating 1,108ft. tested the reefs ahead of the workings. The results of the testings were disappointing. It was found that payable Ore was largely confined to one shoot (Shoot A) with a maximum strike-length of 300ft and extending down-dip for 120ft. to 200ft. from which most of the ore had been extracted. The shoot occurs near the outcrop of the vein system, and the long axis is roughly parallel to the outcrop. Vein-contouring shows that it is situated in a structural basin in the beds and reefs (which are mainly parallel to the bedding) of 151 samples taken from the quartz remaining within the structurally favourable ground, the weighted mean content was 0.96 per cent WO, Ore from within the shootlimits yielded 1.2 per cent W0 3. On the basis of these figures it was estimated that, when the Government ceased mining at the end of 1943, 5,000 tons of quartz averaging 1.2 per cent recoverable W03 remained in Shoot A (Plates 4 and 5).

Information concerning the air-borne scintillometer anomalies has been compiled in this report. The following information is provided for each of the localities included in this report: access, topography, geology, radio-activity, probable cause of the anomaly, and future work recommended.

This report presents the observations collected by B. Walpole and A.A. Opik during a five days journey in June, 1952. They were accompanied by A.D.M. Bell, resident geologist, Alice Springs. In addition a substantial amount of information on the geology of the area, collected by B. Walpole on his previous visit and communicated to the present writer, has been used in this report. The sequence of the rocks as represented here was originally outlined by B. Walpole. From the amount of information now available, it will be possible to produce a more detailed map on the basis of air photographs, which B. Walpole intends to do. The upper Proterozoic age of these sediments and the presence of Collenia was first recognized in the Mt. Marumba by Haddon F. King on a recent visit. On H.T. Jensen's map (1915) the banks of the Wilton River are coloured as "Cambrian limestones and quartzite". On the map of the Commonwealth of Australia by E. David the same rocks are referred to upper Proterozoic and in the text (1950) as undifferentiated Cambrian and upper Proterozoic.

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In December, 1950, the Pakistan Government filed a formal application to Australia, through the Technical Assistance to South-East Asia Co-operation Scheme, for three geologists to carry out geophysical surveys in Pakistan. In May 1951, the geologists, J.F. Ivanac and D.M. Traves of the Bureau of Mineral Resources and D. King of the South Australian Mines Department, arrived in Pakistan. Their instructions were to carry out a geological survey of a portion of the Gilgit Agency, and to discuss with the Director of the Pakistan Geological Survey or any other Government Officer familiar with the problem, the alluvial gold deposits of Chitral River and the lignite deposits of West Bengal and Sind. Field investigations commenced from Gilgit in June 1951, and the party spent four months in the region. This report gives an account of the visit and the results of the investigation.

An examination was made of many of the mines in the Harts Range and Plenty River mica fields during the latter portion of 1951, in the company of Messrs. G.F. Joklik and W. Roberts. The work involved mine surveying and mapping. A great deal of information of a general nature was obtained from Mr. Joklik, who has spent much time studying the regional geology of the area and the mica deposits. The observations here recorded in regard to mining are the writer's responsibility. The geology of the deposits, mining, and exploration, are discussed.

An area surrounding the magnetic observatory at Toolangi was tested for uniformity of the magnetic field. The three elements measured were declination, horizontal intensity, and vertical intensity. The main tests were carried out over the period, 10th December to 21st December, 1951. Further determinations of horizontal and vertical intensity at different heights above two of the stations were made on the 7th and 9th January, 1952. The methods of observation and results of the survey are discussed in this report.

The work done in this investigation was for use in the compilation of a large scale geological map of the A.C.T. The area mapped adjoins that mapped by Flinter and McInnes (1949) and L.C. Noakes (1946). The map accompanying this report includes all of the A.C.T. south of an east-west line through Tharwa. Geological features, including the physiography, stratigraphy, and structural geology of the area, are described in this report.

In the Edith River area uranium occurs as meta-autunite associated with apatite and hematite in narrow siliceous reef formations which are in part brecciated and mylonized. The reefs, which dip steeply west and strike mostly north-north-west, occur over a length of about 3 miles in a north-south, sheared greisenized, zone in granite. Two main types of granite are present, a coarse grained granite and a finer-grained adamellite, which is intrusive into the coarse granite. In places partial digestion of the coarse by the fine granite has produced a porphyritic "hybrid" granite. All granites except the greisenized granite of the sheared zone give high background counts, 2 to 3 times as high as that of the sediments of the Brocks Creek group into which the coarse granite is intrusive. Within the reef formations the distribution of uranium-bearing material is patchy. In many places the best geiger readings are obtained where cross reefs or fractures with a north easterly strike cut the main reefs. Surface samples were taken across most places where significant Geiger readings were obtained and all returned less than .1% U3O8. Commercial production from the field will only be possible if the grade of the original ore has been greatly affected by surface leaching and a site was selected for a shaft to test the primary ore.