The Harold's Cross Barite Deposit lies 7.4 miles slightly north of east from Captain's Flat. Four separate deposits were noted, each occupying a minor shear or joint plane in the granite. The past production and geology of these individual deposits are discussed in this report.

A report on the results of a micropalaeontological examination of samples taken from the depth of 2,000 feet down to 3,132 feet. This series is in continuation of that reported upon on 19/3/46.

The period 30th to 31st May, 1946, was spent in selecting five sites for diamond drilling at the Cosmopolitan Howley Mine, Brocks Creek district. A description of the geology and the conclusions reached as regards drilling are given in this report. A plan of the mine and sections plan are included.

In consequence of planning, by the South Australian Government, to develop and mine the coal seams it was considered that the outer limits of the seams should be known with reasonable accuracy so that neither railway lines nor other permanent structures should be built over coal-bearing ground. An accurate knowledge of these limits was desirable for another reason, namely that in the peripheral zone the ratio of overburden to coal was more favourable than elsewhere. At the request of the South Australian Director of Mines the Commonwealth Government agreed to carry out a routine survey of the periphery of the basin, following the completion of preliminary trial surveys. These were carried out between January and April, 1946. Magnet, earth resistivity and gravity methods were used, of which only the gravity methods proved useful. The history of the field, geophysical problem, gravity instruments, testing, and results are discussed in detail in this report. Accompanying geological plans are included.

The present report gives an overview of the general geology and ore geology of the Blue Spec Mine. The main orebodies are described in some detail. General estimates of reserves and recommendations for future geological work are noted.

This report concerns a geological reconnaissance made of a portion of the Kosciusko area and the preliminary geological plan compiled from air photographs and field observations. General geology, engineering geology, water problems, and proposed works for the hydro-electric scheme are discussed in the report. Three geological plans are included.

Five occurrences of ferruginous bauxite near Rosevale were examined and two of them (Nos. 3 and 4) mapped in detail on a scale of 100 feet to 1 inch. It was felt that Areas 3 and 4 which offered some slight chance of successful development should not be abandoned until a few test-pits had been sunk to confirm or disprove the conclusions reached from the surface inspection. Descriptions of the general geology, individual bauxite occurrences, and testing results are given in this report. A locality plan is included.

The geophysical test survey of this field was commenced on 5/6/45 and operations were terminated on 6/8/46 when it was considered advisable to await the results of the drilling campaign for guidance in planning the future geophysical programme. The most intense work was done on the south-east gossan area where the methods used included, electromagnetic, potential-ratio, spontaneous polarisation, magnetic and resistivity. This interim report is supplementary to a detailed report of the survey and refers in detail only to some of the results on the south-east gossan area.

This report deals with all the known bauxite deposits at Ouse including one occurrence on Cleveland Estate. This report comprises notes on the general situation, access, geology, and bauxite reserves at Ouse, along with descriptions of the individual deposits.

Progress report on the testing campaign, commenced in May, 1945, of the bauxite deposits at Ouse, Tasmania, No. 2 Area.