In company with Mr. L.A. Richardson an inspection was made of this deposit on Friday, December 4th. The workings were plotted and examined, though these sections off the main drives could not be inspected very thoroughly owing to having no lighting available except matches.

Boring by the Alice Springs Works Department and by Webb Bros. of Mt. Riddock Station showed that subterranean water supplies in the schists and gneisses in this area are usually small in quantity and that the water is brackish. The best chances of obtaining water for the mining fields seems to lie in sinking relatively shallow wells on the creeks and depressions running northward from the Harts Range. These depressions are believed to contain from 30 to 60 ft. of alluvium. Eight possible sites for wells were selected, two being within the foothills of the main range and six at a distance of 1.5 to 2 miles from the foothills of the range. Six of these sites are now being tested by a light hand-boring plant. This plant is expected to penetrate the alluvium quickly and wells will be sunk where favourable results are obtained. The sites selected are within easy reach of the following mines: Jenkins' Mine, The Spotted Tiger Mine, B. Rech's (Rex?) Mine, Hit and Miss Mine, Central Mine and Eldorado Mine.

The following notes accompany a plan of one of the areas tested at Moonta, namely, an area embracing sections of Elder's Main Lode and Elder's West lode between Warmington's and Taylor's shafts. The test surveys on which the plan and notes are based were made in March, 1942. The plan is intended to illustrate in a general way the nature of the potential gradient results of all the tests in the Moonta-Kadina area and it should not be accepted as a basis for assessing the value of the tests as a whole. A great number of tests were made embracing the use of potential gradient, electromagnetic, magnetic and self-potential methods, and the nature of the results varied considerably. Correlation between geophysical results and known geology was good in many cases, but indifferent in others. It will be appreciated therefore, that a decision to carry out routine surveys can only be based on a critical examination of the results as a whole.

Historical data concerning the operations and findings at the Coorabin coalfield between 1915 and 1937 has been compiled in this report.

Plans Nos. 617, 618 and 619 are submitted herewith. These plans show no geophysical results. The resistivity curves have been examined and it is considered that certain conclusions can be drawn regarding the behaviour of the clay bedrock. A preliminary structural interpretation has been made on the basis of depth determinations to an interface, assumed to be the top of the clay bedrock. This involves the analyses of three and four layer curves.

Report on surveys made at Coorabin on 12th and 13th August, 1942. Locations of drill sites and bores, and R.L. values are listed.

Geophysical test surveys were made at Boolarra with the object of determining whether geophysical methods were suitable for the exploration of the bauxite deposits found in that district. Field operations were carried out during the period 17th April to 15th May and consisted of the following: 1. Open Cut Deposit - Surface survey and examination of available sub-surface data, geophysical survey using the Resistivity method, over a small area adjacent to the open cut, geophysical survey using the geomagnetic and Natural Earth Potential methods, on one transverse; 2. Orgill's Deposit - Surface survey and examination of available sub-surface data; 3. Budgaree Deposit - Surface survey and examination of available sub-surface data.

The Chilcot mine orebody is a steeply dipping, well defined fissure zone of brecciated andesite, with chalcopyrite in shoots, averaging about 8 per cent copper. Other minerals are bornite, pyrite, hematite, magnetite, quartz and calcite. Pre-ore faults displace the lode channel and are associated with the mineralisation. The ore body is developed by two levels 160 feet in length at 104 and 178 feet depth, and ore is being extracted from a stope between the two levels northeast of the shaft. Water level is a little over 100 feet from the surface. The general pitch of the ore body is about 45 degrees to the northeast. Exploration is recommended of the probable northeast extension of the lode down the pitch, and geophysical investigation to attempt to locate further possible shoots of ore.

Ten days were spent in examination of the property, from July 8th to 18th. All accessible underground workings were mapped in detail on a scale of 30 feet to 1 inch and the surface in the immediate vicinity of the mine on the scale of 100 feet to 1 inch. Mr. J.W. Whiting of the New South Wales Geological Survey provided competent assistance during the surface and part of the underground mapping. Mr W.P. Green of Zinc Corporation Limited and his assistants did everything possible to facilitate the examination of the workings. Plans which have been prepared to accompany this report comprise: Surface plan, Plate 1, plans of all levels and of intermediate stopes, Plates 2-8, east-west cross-sections through the lode at 50 feet intervals, Plates 9 to 13, a longitudinal projection of the lode showing the distribution of mineralisation, and a longitudinal section outlining the amount of stoping which has been done, Plates 14 & 15.

The following notes on the number of the mica mines in the Harts Range area were collected on a recent water survey. They are very incomplete but it is thought that they may be of interest in view of the possibility of stepping up production in this area. Complete data concerning production, etc. of the mines seems to be impossible to obtain.