Exploration summary report 'Toby' period ending 1 March 1989.

Abstract

A geophysical interpretation was made on the data that was purchased by Metana from Austirex International Limited. An airborne geophysical survey was conducted by Austirex between June & July 1984. 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. The Mineral Claims lie within the Black Eye Member of the Carraman Formation. The interpretation shown on figure 3 indicates that the leases are situated on west north-west trending magnetic units. A parallel structural break, part of the Mary Lane Shear Zone, crosses MCC 327,329 and 330. No aeromagnetic 'bulls eye' type anomalies are obvious within the leases. A total of 378 soil samples were taken on an 80 x 40 metre spaced pattern. From orientation work elsewhere in the Tennant Creek field the optimum size fraction for sampling soil for gold was found to be -180 microns. Samples of this size fraction were submitted for aqua regia/GTA gold analysis only. The results are shown on figure 4. There were no significant results, the 4 spot highs greater than 3 ppm were resampled and all returned values of 0 ppb. Future exploration work should include a photogeological interpretation, a ground inspection and geological mapping. Reconnaissance bedrock traverses should be drilled to investigate the underlying lithology and geochemistry. There is potential for shallow, non or weakly magnetic mineralization, especially in the location of the Mary Lane Shear Zone.