This prospect was discovered by Geologist A.B. Clark on the 3rd September, 1953 at a point 11 miles distant and on a bearing of 33 degrees from the Katherine Post Office. Following its discovery a reservation was taken out on behalf of the Bureau of Mineral Resources to protect the area. Detailed geological and geophysical investigations have since been undertaken in the area, and costeaning by hand labour and bulldozer has also been done. The examination and testing of the prospect is not yet complete but a summary of the information concerning the prospect available at 31st October 1953 is given below.

This prospect, which is situated near the headwaters of the South Alligator River on a bearing of 109 degrees and about 24 miles distant from Goodparla Homestead, was discovered by Geologist, B. P. Walpole, on 2nd June, 1953. Following its discovery detailed geological and geophysical investigations were undertaken as well as costeaning and diamond drilling. [A summary of the information concerning the prospect available at 31st October 1953 is given below].

Report on the activities of the administrative and technical sections in the Katherine-Darwin area, to July, 1954. A brief account is given of geological and geophysical operations. The results of prospecting and development work are summarised.

At Whites Deposit, Rum Jungle, chalcopyrite-uraninite ore has been intersected in a cross-cut at a depth of 100 ft., and sampling shows a grade of 1.5 per cent. U3O8 and 4.6 per cent. Cu. over a distance along the cross-cut of 34ft; material containing an average of 0.94 per cent. U3O8 and 2.97 per cent. Cu extends over 60 ft. Uranium mineralization is known to occur over a length of 200 ft, but the average width and grade over this distance is unknown. The ore replaces flatly pitching drag-folded beds and the width of ore along the strike is expected to vary considerably. At Dysons Prospect, about 30,000 tons of autunite-bearing ore, perhaps containing 0.25 per cent. U3O8, has been indicated by drilling. Browns Prospect is similar in many ways to Whites, but no payable ore has yet been intersected. In the district as a whole leaching of copper and uranium has been extensive and favourable areas are, in many cases, covered by soil. Structural conditions are such that non-outcropping ore is likely to be found. To-date, 3,300 ft. of drilling and approximately 700 ft. of underground prospecting have been carried out in the area and the results obtained are considered highly encouraging. Extensive drilling and underground development are warranted.

The areas included in the geophysical survey, namely the Laloki, Moresby-King and Dubuna leases, are among those held by Mandated Alluvials N.L., and lie in the Astrolabe Mineral Field. The positions of the leases held by the Company are shown in Plate G73-1. Laloki, the main producer of copper, is situated 20 miles by road from Port Moresby, near the junction of Sapphire Creek with the Laloki River. The Bureau was requested by Mandated Alluvials to carry out a geophysical survey in the vicinity of the known deposits and in adjacent areas. Both Laloki and Moresby-King mines has been in production up to the time when the war in New Guinea caused a suspension of operations. During the war the mine workings and much of the plant were completely destroyed. When consideration was given to the best method of reopening the mines it was decided that, if a large enough tonnage or ore could be proved sufficiently close to the surface, it would be most profitable to continue open-cut mining, and possibly install a flotation concentrator to avoid the troubles that had always accompanied smelting. The aim of the geophysical survey was, therefore, to locate a body of ore large enough to justify the adoption of these mining and treatment methods.

Report on the activities of the administrative and technical sections in the Katherine-Darwin area, to April, 1954. A brief account is given of geological and geophysical operations. The results of prospecting and field work are summarised.

Report on the activities of the administrative and technical sections in the Katherine-Darwin area, to October, 1954. A brief account is given of geological and geophysical operations. The results of prospecting and development work are summarised.

Report on the activities of the administrative and technical sections in the Katherine-Darwin area, December, 1954. A brief account is given of geological and geophysical operations.

The Capel and Faust basins are located over the northern part of the Lord Howe Rise, a large offshore frontier region containing a number of basins with untested petroleum prospectivity. Recent data acquisition by Geoscience Australia has significantly improved geological knowledge of these basins. Given the diversity of acquired data, comparative sparseness of data coverage, lack of deep drilling control, and complexity of geological structure, effective data integration and analysis methods were essential for a meaningful geological interpretation of the Capel and Faust basins. By using the 3D visualisation and modelling environment provided by GOCAD, the datasets were captured, processed and interpreted to create an integrated 3D model that enabled key geological and prospectivity questions to be answered. This presentation summarises the construction methodology and the resulting geological and prospectivity implications of the Capel-Faust 3D geological model.

This paper provides a brief summary of mineral potential assessments of uranium deposits in Australia conducted by Geoscience Australia during the last 25 years. The assessment were carried out at different scales which vary from the geological province-scale (1:1 million to 1: 2.5 million) to a more detailed local-scale (1:250 000). The scale and method of assessment were defined by the main objectives of the assessment namely: a) competing land-use issues; b) resource availability; and c) prospectivity analysis for mineral exploration. Mineral potential of uranium deposits was assessed using critical mappable features of fertile uranium mineral systems. A mineral system is generally defined by its constituent elements, which include: (1) sources of energy driving the system; (2) sources of fluids, metals, and ligands; (3) pathways along which melt or fluid move, (4) chemical and/or physical traps in proximity to pathways; and (5) outflow zones for discharge of residual fluids; and (6) preservation (Wyborn et al., 1994; Knox-Robinson and Wyborn 1997; Jaques et al., 2002). These constituent elements and their mappable features are used to construct a probabilistic framework for generating mineral potential maps. The levels of mineral potential are either shown in non-numeric symbols, such as high, moderate and low, or in numeric symbols where potential is calculated by using GIS-based methods, such as index overlay, weights of evidence, and fuzzy logic. The paper also discusses a quantitative assessment of undiscovered uranium resources in sandstone-hosted uranium deposits. The assessment is based on the spatial density of uranium resources in sedimentary basins.