A test survey was made with a Radore Equipment over three mineralised areas in Tasmanian. The investigations were made in January, 1955 for the purpose of comparing the performance of the Radore equipment with that of lower-frequency electromagnetic equipment previously used successfully over the same areas. The results show that although some very weak indications were recorded by the Radore equipment, it has not been possible to correlate these satisfactorily with the know mineralisation. Moreover, it is difficult to distinguish indications that may possibly be due to mineralisation from apparent indications that are undoubtedly due to irregularities in topography.

This instrument has been designed in the Radiometric Laboratory of the Bureau of Mineral Resources, t o meet the needs of those uranium prospectors who wish to build Geiger counters. The circuit has been designed so that it can be adjusted with a minimum of test equipment. Indication of the count rate is provided by a ratemeter with three ranges; 0-200, 0-1,000 and 0-10,000 counts per minute. Earphones also provide an audible indication of the count rate. The following rate describes the operation of the circuit and the procedure to be adopted to adjust the voltage at various points in the circuit for correct operation. A schematic circuit diagram is also provided and several points concerned with the mechanical design of the instrument are mentioned.

Twelve rock samples from the Rough Range Structure were submitted by West Australian Petroleum Pty. Ltd. for micropalaeontological examination. The result of the examination of an earlier collection was given in Records 1955/48. Seven of the present samples came from a gully due east of Rough Range Well No.6 and five from a gully due east of Rough Range Well No.6 and five from a gully immediately south of Rough Range Well No.7. The distance between the two well sites is approximately 2 ¼ miles. A detailed description of samples from each section together with the thickness of the section is given below. The sections from each locality are arranged in descending stratigraphical sequence.

In an unpublished report Taylor (1955) suggested that both tectonic earthquakes and volcanic activity are related to prevailing conditions of regional stress. The diagnostic value of this relationship lies in the fact that abnormal stress conditions make their presence known first by tectonic earthquakes and later by volcanic eruption. This theory was developed as a result of intensive research following upon study of the new Hebrides volcanic arc and recent volcanism. Bougainville Island, with a deep trough (Planet Deep) situated west of and orientated parallel to its line of volcanoes, exhibits a similar structural pattern to the New Mebride4s Islands and it was considered by Taylor that the relationship between tectonic earthquakes and volcanic eruptions might also apply here. As a possible means of diagnosis an analysis of earthquakes and volcanic activity in the Bougainville area was undertaken to discover whether a positive relationship existed fro Mt. Bagana, and if so, whether there were indications of impending eruption of the Lake Loloru Crater.

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available