This report comprises notes on the geology, ores reserves, and exploration of the Maude and Yellow Girl Gold Mining Company.

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.

The Treasure Mine, Hatches Creek, is believed to have been discovered in 1914 and has been one of the most consistent producers of wolfram to the present time. This report gives an account of the economic geology of the mine. The ore type, reefs and workings, ore localization, and ore reserves are described.

The Mosquito Creek Wolfram Field was visited on 6th and 7th October, 1951. This report gives a brief account of the inspection. The general geology of the area, the ore-bearing reefs, and the mining leases inspected, are described.

A total of 22 "testing and defining" rotary cored drill holes were drilled by the Bureau and J. McD. Royle Ltd., contractor to the Bureau, during the prospecting for reserves of open-cut coal in the Tomago Stage of the Upper Coal Measures near Buchanan. These 22 holes involved 3640 ft. of drilling and indicated possible reserves of 4,200,000 tons of coal suitable for mining by underground and open cut methods. The geology of the area, and the operations carried out, including mining, logging, sampling, analysis, and surveying, are discussed. The results of the drilling programme are shown in the accompanying maps, and graphic and bore logs.

A total of 25 rotary cored holes were drilled by the Bureau in Portion 49, Parish of Wallarah, County Northumberland, 2 miles south of Swansea. Approximately 1400 ft. of "test and define" drilling proved a possible 200,000 tons of coal suitable to be open cut under an average overburden of 6/1 ratio. The initial drilling programme showed a rolling seam. After surveying, further holes were drilled to locate the displacement which is 10 to 15 ft. in the S.W. corner of the area. No other obstacles are known which would hinder immediate working of the area. The lower split of the Wallarah Seam was tested in three holes but was found to be too thin to warrant further prospecting. The geology of the area is discussed in this report, and the results of the drilling programme are shown in the accompanying graphic and bore logs.

The area investigated lies on the outskirts of Kotara, a suburb in the S.W. of Newcastle. The coal of interest is in the Burwood Seam. Drilling, field work, and surveying were carried out in the area. These operations are described in this report. Drilling results are discussed.

The presence of quartz crystals in the dump of an old gold mine, known as Black Charlie's mine, in the Strathbogie Ranges led to the reopening of part of the workings in the search for crystal suitable for piezo-electric applications. To date the search has met with success, and has resulted in the discovery of a second crystal deposit adjacent to the old workings. The mine which is now named the Crystal King mine was visited in December, 1944. The locality, topography, geology, economic geology, and production of the mine are discussed in this report. A sketch section of the mine is included.

On June 20th King Island Scheelite N.L. asked for advice on the location of suitable drill holes north of their present 150 and 170ft. faces to determine the geology along the No. 3 fault. In this report a scheme of drilling is set out, which would determine the geological structure of the area and indicate tonnage of ore and overburden. A plan is attached to the report which shows the bench limits, the main geological features and selected diamond drill hole sites.

Five leases were taken up by the Commission in the Parishes of Jeeraland, Traralgon, Budgeree and Yinnar in the County of Buln Buln. These notes give brief descriptions of three of these leases and also contain some recommendations relative to prospecting on them. Two geological sketch maps are included.