Annual report on EL 5287, period ending 20 June 1989

Abstract

The geology is well exposed along the Mt Tymn ridge and comprises of coarse to medium grained sandstone, fine sandstone and siltstone of the Early Proterozoic Burrell Creek Formation. Bedding strikes north north west (NNW) with steep easterly dips. Gold mineralisation on Mt Tymn is hosted in sheeted quartz-limonite veins and fine limonite veinlets in the more competent, coarse grained lithologies of the sedimentary package. Veins are generally sub-parallel to bedding, although minor cross-cutting vein systems have been recorded. Grid-based soil sampling over Mt Tymn defined three gold-bearing anomalies. The first anomaly (max. 121 ppb Au) trends NNW over 150m on the northern extension of the ridge. This anomaly is confirmed by rock chip samples which contained grades of up to 7.25 g/t Au. The second anomaly strikes NW and occurs on the eastern side of Mt Tymn. It appears to be a continuation of the northern anomaly. The third soil anomaly (max. 62.7 ppb Au) is at the base of the Mt Tymn ridge, in the drainage path of old gold workings. This anomaly reflects transported gold-bearing gravels and scree rather than in-situ gold mineralisation. Drilling is proposed over the gold targets to test mineralisation at depth. However, the gold targets have recently been pegged by 19 MCN's and thus drilling results will be reported in the Annual Report for the MCN's. Results from the soil sampling programme identified three anomalies. The first anomaly (max. 121 ppb Au) trends NNW over 150m on the northern extension of the ridge. The anomaly blankets an area of massive milky quartz veins which cross-cut the NNW-trending sedimentary units. Rock chip samples from those veins contained up to 7.25 g/t Au, thus identifying the source of the soil anomaly. The second anomaly exists as a large NW-trending zone of > 50 ppb Au on the eastern flank of the ridge. This trend lies mainly over alluvials and quartz scree at the base of the hill and is therefore a transported anomaly. However, some assessment of the alluvial potential is warranted. The western portion of this anomaly coincides with mapped high quartz vein densities, and high gold results from the W.G. Grace rock chip and costean sampling programmes. The third anomaly (62.7 ppb Au), located at 9200mE, lOl0OmN, is on the west side of Mt Tymn and at the base of the ridge, in the drainage path of old gold workings. This anomaly is also thought to reflect transported material rather than in situ gold-bearing rocks. Drilling is proposed over the gold bearing targets and to test the potential of gold mineralisation at depth. However, the targets areas have recently been covered by nineteen (19) MCN's which were granted on the 28th March 1989, and therefore the results will be reported in the Annual Report for these claims. CONCLUSIONS - Gold mineralisation at Mt Tymn is hosted in quartz-limonite sheeted vein systems within the Burrell Creek Formation. Grid-based soil sampling has defined three (3) gold anomalies. The northern anomaly strikes NNW over a quartz-vein system. This anomaly is also supported by two rock chip samples which contained 3.92 g/t Au and 7.25 g/t Au from two NS-striking quartz veins. The second anomaly occurs on the eastern flank of Mt Tymn and strikes NW, parallel to the northern anomaly. The third anomaly is located at the base of Mt Tymn in the drainage path of old gold workings. This anomaly reflects transported material rather than gold-bearing Burrell Creek Formation. A drilling programme of twelve (12), lOOm deep RC holes was completed over the soil anomalies on the 15th June in which the results are still being waited on drilling results will be reported in the Annual Report for the MCN's.