Annual report for period ending 19-08-1992, Willeroo Joint Venture project area, ELs 6633, 6881 and 5359

Abstract

Work conducted by stockdale in the tenement area involved the collection of 196 heavy mineral samples and 1 rock chip sample in response to chromite, garnet and ilmenite recovery during the first year of tenure. Sample results indicate that the Antrim Plateau Volcanics release significant numbers of chromites. No kimberlitic indicator minerals or diamonds were recovered during the reporting period. Airphotos and TM imagery were used to attempt to identify primary intrusives through the Antrim Plateau Volcanics. Although a number of circular features were identified, they were found away from follow up areas, and proved to be volcanic basalt vents. The tenement area has little potential to host a diamondiferous intrusive, and Stockdale has not planned any further exploration. Poseidon have completed a programme of infill sampling on EL 5359 which has potential for carbonate and sandstone hosted Pb-Zn mineralisation within the Tindall Limestone and Jinduckin Formation. Where possible the old SPL sites were located and resampled. The original anomalous sample results for Mathison Creek, previously outlined by BHP and Stockdale, have been confirmed and the area of anomalism enlarged. The follow-up sampling highlighted an area containing anomalous Pb, As, (Ba, Co, Zn) values. The anomalous Pb values were in creeks draining the western side of the ridge of Jinduckin formation and underlying Tindall Limestone. A max. value of 960ppm was recorded. Anomalous values were recorded in a number of sumples including a rock sample which contained 2.1% Pb, 8.2% ba, 40ppm Sb, 3900ppm Zn, 380ppm As and 4.2ppm Ag. The distribution of the results suggests the anomalous values are derived from the Dorisvale fault zone and Tindall Limestone. These results are sufficient to warrant further detailed sampling which has been planned for the 1992 field season.