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.

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Mullalyup is a small village about 140 miles south from Perth and 33 miles by rail south-east from Bunbury. The main highway between Perth and Bridgetown passes through the village. The region is occupied by Basement rocks which appear to consist mainly of schist and gneiss. The regional strike is about north-west. The hill slopes and lower levels carry a heavy cover of soil and the hilltops are mostly covered with laterite and, in places, high-level gravels. These gravels are widely distributed in this region. The mica occurs, as usual, in pegmatite dykes, and five such deposits are shown on the attached plan. Some difficulty was experienced in locating these deposits owing to the thick undergrowth and hill terrain and it is probable that other pegmatites exist in the locality. Search was confined mainly to the slopes and it was considered that soil in the valleys and laterite on the hill tops would obscure outcrops of any pegmatite dykes, except at intermediate levels.

Ajana is 66 miles north from Geraldton by rail and is the terminus of the branch railway which passes through Northampton mining district. Aspects of regional geology and mineral occurrence are discussed in these notes.

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.

The Chilcot copper mine is situated 15 miles south-south-west from Orange, from which it may be reached by reasonably good road. It was examined during 1942 by Dr. N.H. Fisher, Chief Geologist, Mineral Resources Survey, who recommended that a geophysical survey be made to search for additional ore shoots along the lode channel (1942/020). The geophysical survey was made during the three weeks ending 19th December. Operations were commenced over the area north-east of the mine, extending a distance of 550 feet from the mine, thus covering the part favoured by Dr. Fisher for extension of the lode channel. Later the survey was extended a similar distance to the south-west and the north-eastern part was extended a further 150 feet. Methods used comprised geomagnetic, spontaneous, polarisation, electro-magnetic and potential ratio. Traverses were placed at 50 feet intervals and observations by the various methods were made at intervals of 25 feet and, in some parts, at closer intervals. The results of this survey are discussed herein.

This report describes the results of a micro-examination of rock samples from bore No. 1471. The samples were taken between the depths of 22 feet and 681 feet.

This report describes the results of a micro-examination of rock samples from Mrs. F.F. Bennett's Bore No. 3805. The samples were taken between the depths of 17 feet and 1984 feet.

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.

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.