Report on surveying, sampling, and plant sampling work carried out during the month of July, 1947.

The Cobar mining field was examined between August, 1946 and June, 1947. Attention was concentrated on the operating mines, viz. New Occidental, New Cobar and Chesney. New Occidental Gold Mines, N.L. owns all three deposits and had requested assistance from the Commonwealth Government to search for new orebodies on their leases. It had previously been recognised that each of these orebodies lay close to a sharp contact between fine-grained and coarse-grained sediments. Of particular interest are the portions of the contact which have been subjected to minor folding, because, immediately to the south of these folds, fracturing favourable for ore localisation has developed. The geological examination was carried out in conjunction with the Geological Survey, Mines Department, New South Wales. Surface and detailed underground mapping were carried out. A preliminary magnetic survey of part of the field was carried out by the Geophysical Section during the first half of 1947. A special study of the New Cobar Mine and the plans of that deposit were made by Dallwitz, Fleischman and Ivanac. This report provides a comprehensive overview of the situation, topography, history, structural geology and general geology of the area. Detailed descriptions are given of the history, workings, orebodies, and structure of each individual deposit. Various accompanying plans of the mines and the Cobar mineral field are included.

The aim of this examination was to map in as much detail as possible the structure of the Apinaipi Anticline, which is situated on the coast of Papua, 100 miles north-west of Port Moresby. The survey programme and the geomorphology, structure, and lithology of the area are discussed in this report. Accompanying maps and section plans are included.

This report comprises notes on access, physiography, the formation of heavy mineral deposits, and the geology of Stradbroke Island.

A geological reconnaissance was made of an area of approximately 27,000 square miles lying north and west of Katherine in the Northern Territory. The report is compiled in two parts. The first concerns general geology and includes accounts of the nomenclature, stratigraphy, structural geology, geological history, and geomorphology of the area. The second part comprises a summary of the economic geology. The mining industry, petroleum prospects, underground water, and recommendations are discussed. A table showing the mineral production figures for the Northern Territory, northern district, is appended.

The geology, production history, ore grade, and ore reserves of the Northern Star Mine are discussed in this report. Four accompanying plans are included.

A geophysical survey of the Hampton Plains areas was conducted between September and December, 1946. The geology and nature of the problem, geophysical work, and results of the survey are discussed in this report. Accompanying plans are included.

Notes on samples of limestone collected from three caves on the Nullabor Plains, the Koonalda, the Abrakurrie, and the Weebubbie, and from the surface crust in the vicinity of the caves.

Overview of general work, sampling, mapping and levelling, drafting, and laboratory work carried out during the month of September, 1947.

The oldest rocks found in this area are Pre-Cambrian and the youngest are Recent but on the whole the area is one of great stability and not many of the periods of geological time are represented. The Pre-Cambrian are found outcropping round the edge of the basin and for simplicity in field work have been divided into five divisions. These are Tennant Creek, MacArthur R., Buldiva, Helen Springs, and Barkly Downs. This report provides a field summary of geology by division.