Legacy product - no abstract available

The period 7th to 28th January, 1951 was spent at Selwyn by the writer: approximately one week was spent in preparing a semi-regional map at a scale of 1 inch to 400 feet; one week was given to mapping a smaller area at a scale of 1 inch to 40 feet. Level plans have been constructed showing what are considered to be the broad outlines of ore arrangement and structure and a number of sections have been constructed. Nineteen plans and sections illustrate this report. Twelve typical ore and rock specimens were studied in thin section and the information obtained has been incorporated in this report. An account of the regional geology of the prospect and the geology of the ore deposits is given in this report.

The following abstract was written in order to facilitate the compilation of the Queensland four-mile geological sheets and the explanatory notes accompanying them. The area described covers the Springsure, Emerald, Jericho and partly the Tambo and Baralaba four-mile sheets.

This statement gives the results of a scout drilling campaign conducted by the Bureau at the Kirby's Hill Area of the Western Coalfield of New South Wales. The area investigated comprises approximately 200 acres of the parish of Cullen Bullen in the County of Roxburgh. At Kirby's Hill itself a maximum of about 300 feet of Coal Measure rocks rests on Upper Marine beds, and this is one of the most westerly exposures of the Upper Coal measures. The purpose of scout drilling was to determine the suitability of the Lithgow and Irondale Seams for open cut exploitation.

The results of the present investigation continue northward the information already gathered in the Australian Capital Territory by Dr. A.A. Opik of the Bureau of Mineral Resources. The work was carried out to fill in a gap in geological information, which existed in this area, to enable completion of the Lake George one-mile geological map.

This report is supplementary to a report on the Kuridala Copper Field, Cloncurry district, Queensland, by C.J. Sullivan and R.S. Matheson (1950) and should be read in conjunction with that report. Sullivan and Matheson showed that, in the known deposits, ore occurs in the Hampden Fault, where slates in the hanging-wall of the fault are thrust against the resistant amphibolites occurring in the footwall (western side) of the fault. The rocks to the west of the fault were known, from mapping carried out by Broadhurst (1936), to be folded into a synclinal structure and it was postulated by Sullivan and Matheson that further ore may be found where the fault intersected amphibolites occurring stratigraphically below the amphibolites near which the known ore occurs (Sullivan, and Matheson 1950, Plate 1, Regional Cross Section). It was realised by Sullivan and Matheson that the prediction of a position of the amphibolites, at depth, involved considerable uncertainty and it was thought that further mapping of the Western Syncline might enable a reasonably accurate interpretation of the position of the amphibolites to be made. The [present] field work was carried out between 20th August and 18th September, 1951, by K.W.B. Iten and R.A. Searl of the Bureau of Mineral Resources and J.H. Brooks of the Geological Survey of Queensland. The general postulations by previous investigators concerning the relationship of geological structure to ore occurrence were checked but no detailed investigation was made of the size, shape and grade of known ore-bodies; the present investigators consider that the interpretation by Sullivan and Matheson (1950) of the structural controls of ore deposition may be correct.

Benbow crater is the main residual active centre of the large ancient volcano which has formed Ambrim Island. For the eleven months preceding December 1951 it has been the source of extraordinarily intense and prolonged explosive activity. The volume of ash and scoria ejected during this period exceeds 800,000,000 cubic metres. Evidence has been found during the recent inspection of this volcano that suggests that the current phase of explosive activity has ended. The 1950-1951 eruption, possibility of future activity, and effects of the eruption, are discussed in this report.

This statement sets out the results of drilling in part of the Minmi Area, Newcastle District. The area covered by the drilling grid totals about 390 acres and includes parts of Portion 130, Ph. of Teralba and Portions 15 and 26, Ph. of Hexam. This statement refers to the western and central blocks of the area. Proximate analyses and calorific value determinations of the coal cores were made by the New South Wales Mines Department laboratory in Sydney. The analyses here quoted indicate a composition roughly equivalent to that which might be expected for cleaned or hand-picked coal from this area.

An examination was made of many of the mines in the Harts Range and Plenty River mica fields during the latter portion of 1951, in the company of Messrs. G.F. Joklik and W. Roberts. The work involved mine surveying and mapping. A great deal of information of a general nature was obtained from Mr. Joklik, who has spent much time studying the regional geology of the area and the mica deposits. The observations here recorded in regard to mining are the writer's responsibility. The geology of the deposits, mining, and exploration, are discussed.

Geological investigations, survey work, and mapping were carried out in the vicinity of the Tennant Creek gold field between 1948 and 1950. This report provides an overview of the investigations carried out on the Enterprise, Patties, and Eldorado mines. The working, production history, and geological features of these areas are discussed.