Details and results are given of a seismic refraction survey made at the request of the Hydro-Electric Commission of Tasmania, to investigate the site of the western portal of the proposed Mossy Marsh Tunnel. The tunnel is part of the No. 2 Tarraleah Canal project to transport water from Lake King William to Tarraleah Power Station. The primary object of the survey was to determine the thickness of till overlying the dolerite bedrock, and hence contours of the bedrock surface.

An examination of a small area flanking the Molonglo River at Acton was undertaken at the request of the Department of Works and Housing. The construction of the weir across the river within the area examined to raise the water level to 1825' is proposed, and the geological investigation was carried out in connection with this proposed work. Aspects of general geology and engineering geology are discussed. A geological plan and sketch sections are included.

Following a request from the Department of Works and Housing, the Bureau of Mineral Resources carried out a geological investigation of a possible dam site in the valley of Pierce's Creek, a tributary of the Cotter River. The general geology of the area, and aspects of engineering geology, are discussed in this report. A geological plan of the site is included.

The first geological reconnaissance of the proposed diversion of the Snowy River to the Murray Valley was undertaken in late 1946. This work was followed by more detailed work in the summer of 1947-8 when field parties carried out a reconnaissance of a strip of country covering the approximate route which the main tunnel is expected to follow. Part I of this report deals briefly with the geological work accomplished during the two field seasons and provides a summary of the engineering geology of the main and subsidiary tunnel lines. Parts II and III consist of the geological reports by the leaders of the two field parties. Part II covers the survey area from Waste Point to the Geehi River. Part III covers the survey area from the Geehi River to Khancoban. Accompanying plans are included.

This report has been prepared at the request of Engineers of the Department of Works and Housing. The writer spent a day with Mr. Crotty examining the site, and another day alone studying general geological conditions relevant to the proposed scheme. The visit and its findings are outlined in this report.

This report covers the work done by the author who was geophysicist with the Australian National Antarctic Research Expedition at Macquarie Island from April to December, 1953. It is a sequel to Records 1953/30 and 1954/32 and deals with observatory routine and maintenance and other general duties required of the geophysicist. The report contains the results of absolute magnetic observations and initial earthquake phases. Detailed tables of scientific results will be published separately in reports at present in preparation.

The datasets contain spatial locations in point format as a representation of embassies, high commissions and consulate facilities/missions in Australia.

The possibility of diverting the Upper Snowy River to provide water for irrigation has been a subject of discussion since 1884. The Snowy Mountains Hydro-Electric Authority was constituted in 1949. As the body responsible for the detailed investigation of the geology of the area it was thought desirable to publish the geological work which has been done in the Snowy Mountains region. With the authority of the Under-Secretary of the Department of Mines, New South Wales, the reports by members of the Geological Survey of New South Wales are included together with reports by geologists of the Commonwealth Bureau of Mineral Resources, Geology and Geophysics. Reports included in this publications are: "Geology - Jindabyne to Murrumbidgee River", "Reconnaissance Survey of Dam Site at Geehi, Swampy Plain River, N.S.W", "Geological Reconnaissance of the Proposed Hydro-Electric Works in the Kosciusko Area", "Geological Reconnaissance - Eucumbene River to Tumut River", and "Geological Reconnaissance - Murrumbidgee - Tumut Area".

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.

In August, 1947 the Bureau was requested by the Clifton Brick and Tile Company to carry out vibration tests on that Company's brick pit at Preston, Victoria. Tests were carried out at the brick pit on December 17th, 1947 and February 2nd, 1948 by officers of the Bureau. Six charges of explosives were detonated at different points in the brick pit and the amplitude of the ground movement was recorded. Additional records were made of ground movement due to other causes, such as vehicular traffic on a public road-way adjacent to the brick pit. It is the purpose of this report to summarise the results of the tests by tabulating the vertical ground movement recorded and to compare one with another, the amplitude due to different causes.