The country rock of the Coimadai antimony orebodies is Lower Ordovician slate and sandstone, with northerly strike and steep westerly dip. It is intruded by narrow east-west striking pre-mineral porphyry dykes, which dip north and are displaced by or in places form the walls of the lode channels. The antimony lodes are lenticular ore-shoots in fault zones which show signs of intense crushing and shearing, the shoots being usually associated with fault intersections or branches. The workings are divided into two sections: No. 1, Draper's, in which the lode system strikes north-northwest and dips 45-55 degrees west, and No. 2, Bondison's, where the strike is east-northeast and the dip 60 degrees to the north. In No. 1 section most of the ore above the adit level has been extracted, but possibly 400 tons of the 5% Sb, ore have been developed below the level, and prospects of further ore are good. Gold values are much higher in No. 2 than in No. 1 section, but few assay data are available with regard to either antimony or gold content.

These deposits, usually known as Hite's Felspar, are situated southeast of Bombala, in M.L.1., Parish of Nalbough, County of Auckland, on the easterly slope of a spur running northward from a sister peak to Wog Mountain. This preliminary note concerns the situation and geology of the felspar and molybdenite deposits at Wog Mountain.

The Moonta-Wallaroo copper field was discovered in 1860 and has been one of the most productive copper fields in Australia. At the time that large scale mining operations ceased in 1923, copper to the value of over £20,000,000 had been produced. At the present time no active mining is in progress and the old mines are closed and the mining plant completely dismantled. There are two main copper producing areas in the field, namely Moonta and Kadina which are 10 miles apart. There are a number of smaller copper areas between and around the main ones. A recent investigation by Mr. S.B. Dickinson of the South Australian Mines Department indicates that while some of the old mines have small known ore reserves, the cost of re-establishing these mines would be too high to warrant such an enterprise. It is probable that all the surface showings of copper have been fully investigated but it is also probable that many lodes exist which show no surface signs. How these lodes are to be discovered is a matter of immediate concern. The present report deals with an extensive survey of parts of the Moonta and Kadina sections of the field. The work was commenced on a large layout pegged to the south-west of Beddome's and Green's lodes on the centre belt of fracturing at Moonta. Following the findings of the test report, the layout was covered by potential ratio and phase surveys and by a self-potential survey. Upon resumption of field work it was decided to use the electromagnetic method in a large scale test on Beddome's layout. Some self-potential and potential ratio work was carried out on the Kadina layouts, but it was found that these methods suffered from the same disability, namely a great number of effects which obviously were due to lode shears, as had been found in the case of Beddome's layout. In this report, the interpretation is based solely on the results of the electromagnetic surveys.

Microscopic examination of cores from bores Nos. 84 and 109.

The felspar deposit which is owned and operated by South Australian Silicates Co. Pty. Limited was visited on the 13th September, 1943, in company with Mr. Sampson, Secretary, of the Company and Mr. S.B. Dickinson, Deputy Government Geologist of South Australia. A description of the deposit follows in the report.

Report on the asbestos deposit near Bindi Bindi following a visit to the deposit in September, 1943.

The collection of rocks from the Ok Ti River, Western Papua, was made by Mr. L. Austen in 1922 and is housed in the Commonwealth Palaeontological Collection. It consists of shelly and foraminiferal limestones of Miocene age. The present examination of the collection is being undertaken at the request of the Australasian Petroleum Company, Melbourne.

The most important phosphate deposits in South Australia are situated in the Kapunda-Angaston districts and of those the principal deposits which have been worked are: 1) St. Kitts, 11 miles easterly from Kapunda; 2) St. Johns, 4.25 miles south-east from Kapunda; 3) Tom's, 5 miles east-south-east from Kapunda; 4) Moculta or Klemms, 3 miles north-east of Angaston. Deposits Nos. 2, 3 and 4 were examined in company with Mr. S.B. Dickinson, Deputy Government Geologist of South Australia on the 30th March. The following notes are written to set out as briefly as possible, the salient features of the deposits and to indicate the prospecting which it is considered is immediately necessary.

The samples of diatomite were received recently from the Director of the Geological Survey of New Zealand. The localities for the samples are given as Middlemarch, Wainui and Whirinaki. The three diatomites are of freshwater origin. The following notes are the result of microscopic examination.

Report on a seismic survey carried out in order to determine whether the vibrations from blasting, when transmitted through the ground, were sufficient to cause structural damage to residential properties in the vicinty of the quarry at Balls Head.