A virgin area which has never previously been drilled or exploited with first drilling completed in 2021. Consists of 3 distinct targets:
- Southern Alteration Zone
- Eastern Shear Zone
- Northern Slate Zone
Great Western identified these targets through satellite imagery, desk top research, rock chip sampling, soil sampling and trenching.
First-phase drilling programme for gold and silver complete, with six holes drilled at the Southern Alteration Zone (“SAZ”) totalling 1,685 feet (515 metres) using a reverse circulation (“RC”) rig.
During 2021 drilling encountered gold at shallow depths in multiple holes with best intercepts 8.02 g/t Au in one hole and 2.29 g/t Au in another.
Follow-up drilling needed to uncover further extensions along strike to the west. Deeper drilling will aim to establish whether the zones contain significant dip extents.
Next phase of drilling will test a potential increase in zone thickness and grade where narrow structures coalesce, either along strike or down dip. 5 holes totalling 2,380 feet (725 metres) are planned.
Great Western has a target range of 25,000 - 75,000 oz gold for the Rock House Group.
The geology at RH Group is dominated by Palaeozoic and Mesozoic sediments, overlain by Tertiary age volcaniclastics. The pre-Tertiary sedimentary units consist of flaggy brown and grey slates in the north and black carbonaceous siltstones in the south (Figure 1). Tertiary age volcanic units include rhyolites in the west and mafic tuffs to the north, which unconformably overlay the basement units. The basement slates and siltstones are considered contemporaneous with the Candelaria and Palmetto Formations found to the East at Candelaria, which host the bulk of the Silver mineralisation found there.
At RH Group, massive-sulphide bearing oxidised quartz breccia veins, with pervasive silicification and argillic alteration on faulted contacts between the slate, siltstone and rhyolites, have been mapped and sampled (Figure 1 and Figure 2). These mineralised structures are traceable across the entire 2.7 km E-W extent of the RH claim block and have been designated as the Eastern Shear Zone (“ESZ”) prospect.
A subsequent soil sampling campaign over the remainder of the basement exposure at RH Group has clearly identified two further prospective zones of mineralisation, in addition to the Eastern Shear Zone previously mentioned. These two new prospects have been designated as the Northern Slate Zone (“NSZ”) and the Southern Alteration Zone (“SAZ”) (Figure 3). A full table of results from the soil sampling programme, containing the major metals and pathfinder minerals, is shown in Table 1.