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.

A report on the Montana silver-lead mine, Zeehan, Tasmania.

The discovery of tin ore on the field was made in June, 1890, and for many years work was confined to the alluvial and detrital tin ore. The gossan outcrops of the pyritic tin-bearing ore bodies were not recognised as the source of the detrital tin for some years. During the construction of the Emu Bay Railway in 1900, the railway line necessitated a large cutting on the Renison Bell lease, and exposed the main lode system. Capital was not available for development of the property, and operations were confined to the erection of batteries to treat the detrital matter and oxidised ores which were free-milling. Spasmodic attempts have been made to treat the sulphide ore by precalcination and gravity concentration, and at the present time Renison Associated Tin Fines N.L. are experimenting with the flotation of cassiterite, which is preceded by flotation of the iron sulphides. Inspection of all workings reveal that the area has been carefully searched for all outcropping tin lodes, and mining operations have been more or less confined to selective mining of the oxidised ore and very little of the richer sulphide ore. Capital was not available for development of the property, and operations were confined to the erection of batteries to treat the detrital matter and oxidised ores which were free-milling. Spasmodic attempts have been made to treat the sulphide ore by precalcination and gravity concentration, and at the present time Renison Associated Tin Mines N.L. are experimenting with the flotation of cassiterite, which is preceded by flotation of the iron sulphides. Inspection of all workings reveal that the area has been carefully searched for all outcropping tin lodes, and mining operations have been more or less confined to selective mining of the oxidised ore and very little of the richer sulphide ore.

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

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.

The principal heavy mineral deposits occur along the stretch of beaches from Ballina to Tweed Heads, in northern New South Wales, though lesser, but still commercial, accumulations are known at least as far south as Coff's Harbour, and north to Southport in Queensland. Beaches at Yamba, Wooli, and at Fingal have been worked out by Porter and Derrick, the principal producers. This report gives an overview of mineral occurrence, and the formation, composition, and origin of the deposits.

The Pink Lakes, also known as Linga Lakes, lie in the Parish of Mamengoroock, Country of Weeah, in north-western Victoria, about 10 miles north-north-east of the small town of Underbool on the Ouyen to Pinnaroo railway (See Fig. 1). The three lakes known as the Pink Lakes that are being worked for salt are Sailor Lake, Lake Crosby and Crescent or Home Lake. The areas of the salt leases are: Sailor Lake leases, 206 acres; Lake Crosby leases, 395 acres; Crescent Lake leases, 311 acres. Portions of the above areas are occupied by the beaches and fore-shores of the lakes, and the total potential salt-bearing surface of the three lakes is actually about 700 acres. In addition to the Pink Lakes above-mentioned there are in the vicinity two other salt lakes viz: (a) Lake Poulton, about 70 acres in area, and two miles west of Lake Crosby, and (b) an un-named lake, here referred to as 'School' Lake, probably rather less than 50 acres in area and situated one mile south of the west end of Crescent Lake. Salt is formed on both these lakes, but Lake Poulton is somewhat difficult of access on the north-east and north, and School Lake is in a Government Reserve and is not available for leasing. The geology and salt resources of the Lakes are outlined. Several proposals, put forward with a view to increasing the yield of salt from Pink Lakes, are discussed herein.

Preliminary assessment of core recovered from drill holes Nos. 22, 23, and 24, King Island.

D.L. Murray's Bore, south-west of Bourke is the most westerly yet to be examined in that area of New South Wales. From the palaeontological aspect it is probably the most interesting, for the majority of samples contain numerous arenaceous foraminifera of Lower Cretaceous age. Samples were examined from the depth of 25 to 375 feet.

This report deals with the results of a geophysical test survey which was carried out in the vicinity of the Burra mine between March 4th and 13th, 1942.