Final report on AP 2192 Barrow Creek.

Abstract

All work done on this prospecting authority was in conjunction with 2000, 2018, 2190, 2191, 2192 and 2261. General photogrammetry using Government aerial photographs resulted in areas of interest being delineated and lines selected for an induced polarization geophysical programme. Seigel Associates Australasia Proprietary Limited made a literature survey of aeromagnetic contour maps along with geological and gravity maps of the areas delineated and their report is included. During the month of January 1970, the P.A. was subject to extensive aerial reconnaissance with a helicopter by our regional geologist and following this 20 line miles were gridded in preparation for a geophysical survey programme. A field camp was then established in the area and on the 26th January, an induced polarization survey was commenced by Seigel Associates. Much of the area surveyed was covered by stands of mulga and approximately 15 line miles had to be cleared by a bulldozer. In the original reconnaissance survey the lines were separated by 10,000 ft and the profiles show broad and general changes in values in most localities. Between line 00 and line 10,000 some more closely spaced surveying was undertaken, dipole -dipole being the method applied. Within this central area, several well defined high chargeability anomalies were revealed and following an appraisal of the survey data by Seigel Associates, several targets were recommended for diamond drilling. A location map of the drill holes with respect to the I.P. anomalies is attached to this report. Towards the end of March, a Longyear 34 drilling rig was moved from Hatches Creek to the area and on 24/3/70, Murray Downs DAH No.1 was spudded. This hole was completed at a depth of 3Q5ft without encountering any mineralization. A second and final hole was drilled to 317ft also without encountering mineralization. Drill logs of both holes are attached along with a thin section report carried out by Unisearch Limited. Both drill holes did not encounter mineralized sedimentary rocks as was expected, but rather an intrusive dyke appears to have been the cause of the I.P. anomaly. The net result was that the central area did not have the geology expected and so the anomalies were not caused by sub-surface metallic suiphide mineralization. No further work was carried out on the P.A. and the area has since been relinquished.