Summary report on exploration 'Enterprise South' 01-03-1989.

Abstract

An airborne geophysical survey was conducted by Austirex between June. July 1964. The flight lines were spaced by 200 metres, with tie lines separated by 4000 metres. A proton precession magnetometer was used for data collection. This had a resolution of 0.1 nano Tesla, a cycle rate of 0.5 seconds and a sample interval of 30 metres. Metana purchased this data from Austirex and have re-interpreted the data. The project area lies to the south of a major east-west structure that links the Skipper and Mt. Samuel to Nobles Nob and Juno. A ground magnetic survey was carried out by Solo Geophysics. Readings were taken at a height 8 feet at 5 metre intervals along 40 metre spaced grid lines. The contoured results are shown in figure 5. There are no significant magnetic Features within the project area itself. The leases lie to the south of the obvious Enterprise, Estralita and Patties ironstones. From orientation work carried out over project areas else where in the Tennant Creek field, the optimum fraction for sampling soils was found to be -180 microns. Samples of this fraction were taken over the entire project area on a 40 x 20 metre spaced grid and submitted for aqua regia/GTA gold analysis. Initially the results look highly anomalous, however the results were found to be spurious due to a blanket of windblown contamination from the Eldorado tailings. Soil sampling is not applicable over the project area. A programme of bedrock drilling either over all of the leases or just over selected areas, to sample below the contaminated surface, would be useful to delineate targets. From the results else where in the Tennant Creek field, analysis for elements other than gold such as copper, zinc, lead and bismuth is recommended.