25% coverage east & west corners F54/B1-73 Contour interval: 10

Provided by the Mineral Resources Authority

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Includes Record 1955/095

This Bulletin contains nine papers describing the Cambrian Geology of Australia. Seven of the papers describe the Cambrian geology in each State and 2 papers deal with topics related to the Cambrian geology over Australia.

In response to an application by Renison Associated Tin Mines N.L., supported by the Department of Mines, Tasmania, a geophysical survey of the Renison Bell Tin Field was started by the Bureau of Mineral Resources, Geology and Geophysics in 1950 and continued during 1951 and 1952. The field is situated in the West Coast region of Tasmania, and, up to 1955, had yielded concentrates containing about 3,000 tons of metallic tin. The object of the survey was to assist in the finding of additional ore-bodies in the field. In a survey of portion of the field by the, Imperial Geophysical Experimental Survey in 1929-30, the magnetic and self-potential methods were the most successful of those tested, and these methods were therefore used by the Bureau. The work done in 1950 was mainly over known ore-bodies, and the results obtained confirmed the applicability of the methods, as well as proving anomalies that could indicate sulphide bodies containing pyrrhotite. In 1951 and 1952, the survey was extended to the south and east of the area surveyed in 1950. Numerous intense, well-defined anomalies were obtained by each method, and in many places the anomalies obtained by each method agreed generally in position. These anomalies provide strong indications of sulphide mineralization containing pyrrhotite, but testing will be necessary to determine the extent and nature of the mineralization and the tin content thereof. Recommendations are made for the testing of the indications by drill holes and trenches, and for the extension of the survey to other parts of the field, but not until the results of this testing of anomalies are available.

Development work and exploratory diamond drilling at the Adelaide River Uranium Mine showed the presence of an ore shot, known as the Black Lode, which contained about 70 tons per foot depth of ore averaging about 0,5% U308. The shoot was developed to a depth of 200 feet. Most of the developed ore has been stoped and about 3,500 tons of ore from the mine have been treated at Rum Jungle. About 1,500 tons of ore remain broken in stopes but there are no proved ore reserves. The mineralization is localized by the intersection of shears and beds of sandstone. The evidence suggests that the Black Lode ore shoot continues in depth and that a repetition of the ore shoot is possible. Diamond drilling and development work are recommended.