This deposit was examined in company with Mr. L.C. Ball, Chief Government Geologist of the Queensland Geological Survey on Wednesday, January 5th, 1944. It has previously been described in some detail by H.G.S. Cribb of the Geological Survey. Since Mr. Cribb's examination was made, the workings southwesterly from the shaft have been extended somewhat, but the owners, Messrs. Elver Bros., at the time of our visit were proposing to abandon that shaft on account of water and the fact that the drives were too long for economic working. The mining method used is expensive, slow and inefficient. Less than 50%, probably only about 30% of the bentonite is recovered by the existing procedure. This report details the origin of the deposits and proposals for future testing.

The first part of this report deals with the second phase of the geophysical test work carried out in connection with the investigations into the water seepage problems at Leeton on the Murrumbidgee Irrigation Area. The original test work was carried out by Mr. J.M. Rayner, then of the New South Wales Mines Department, following a request by the Water Conservation and Irrigation Commission. The work described herein may be considered as an extension of that done by Mr. Rayner and it will be assumed that the reader has access to his reports. The second part of this report deals with geophysical test work on a sandhill area at Narrandera where it is proposed to establish citrus farms using spray irrigation.

The Wilks Creek wolfram mine is situated in the parish of Steavenson, county of Anglesey in central Victoria. It is approximately 4 miles south from the small town of Marysville, a popular tourist resort, and 61 miles by road northeast from Melbourne. Underground and surface mapping was carried out on the 23rd and 24th November, 1943, with compass, tape and Abney level. This report comprises an overview of production history, general geology, economic geology and ore reserves.

The presence of quartz crystals in the dump of an old gold mine, known as Black Charlie's mine, in the Strathbogie Ranges led to the reopening of part of the workings in the search for crystal suitable for piezo-electric applications. To date the search has met with success, and has resulted in the discovery of a second crystal deposit adjacent to the old workings. The mine which is now named the Crystal King mine was visited in December, 1944. The locality, topography, geology, economic geology, and production of the mine are discussed in this report. A sketch section of the mine is included.

The testing programme described herein is the result of a recommendation made in a previous report. Twenty-four boreholes were put down during October, 1944, to determine the extent and quality of the bentonite and associated clays. During the early part of the boring campaign the area was surveyed in detail by plane-table with the assistance of the Queensland Geological Survey. The details and results of boring, origin of the bentonite, micro-fossil content, testing, and reserves are discussed in this report. Logs of Boreholes, a plan of the bentonite deposit, and cross section diagrams are included in the report.

This report deals with an investigation of the electrical resistivities of a variety of wet surface soils, gravels and sands. The work may be regarded as preliminary to an investigation by Mr. R.F. Thyer into the detection of electrically resistive bodies buried in wet soils at shallow depths. It was required to determine the range over which the resistivities of surface soils vary, and also the changes that may be expected in any one type of soil between measurements made within any 1 foot of each other. Measurements were made in four localities, three being in the bed or on the banks of the Molonglo River, where the surface materials are sand, gravel, silts, and in some places, clay. The fourth locality was near the head of Sullivan's Creek, where the soil is a heavy black clay.

This report deals with the problem of detecting electrically resistive bodies of small size buried at shallow depths in wet soils. Detection was attempted by means of measurements made on the surface of the soil using the electrical resistivity method. The present report can be regarded as an extension of an earlier one (No. 1943/64B). The purpose of the new tests was twofold. Firstly it was proposed to make tests of 'normal' resistivity effects using a constant electrode arrangement and measuring the resistivity at closely spaced points on water saturated soils. The second part of the testing programme was contingent on the first part proving that under saturated conditions soil resistivities were sufficiently constant to warrent an attempt being made at detection. If this condition of constancy existed, it was proposed to extend the work of the tests, reviewed in the previous report, to actual field conditions. This has been done and the present report deals with the results obtained.

The Gawler talc deposit is situated about 2 miles south from Ulverston and about half a mile north from Gawler where the bitumen road ends. The lease is held by Messrs. Pearson and Smith, and one man is working on it at present. A geological examination and plane table survey of the deposit was conducted on the 1st May, 1944.

The mine is situated on Black Andrew Mountain about 4 miles south of the wall of Burrinjuck Dam and in the parishes of Goodradigbee and Childowla. Surface features were mapped by C.H. Zelman and H.B. Owen in November, 1942 by stadia alidade and planetable, and underground mapping was brought up to date by F. Canavan and H.B. Owen on 20th March, 1944 using tape, alidade and clinometer. This report details the production history, general geology, and economic geology of the Black Andrew mine.

In a memorandum dated 28th February, the Superintending Civil Engineer of the Department of the Interior stated that cracks were showing in the Cotter dam, and that these were serious enough to warrant an investigation as to whether there were minerals in the aggregate likely to cause expansion on decomposition. Visits were made to the Cotter dam and the adjacent rock quarries, and this report embodies the results of those visits and subsequent investigations. All possible geological factors likely to affect the stability and strength of the dam were investigated and, even though it was subsequently found that some of them could have little or no effect on the dam, they are discussed in this report.