Mutooroo Ridge Cu-Co Project (SA)

The Mutooroo Ridge project, consisting of EL6230, is located 70km SW of Broken Hill. EL6230 was granted in August 2018 for an initial period of 2 years. It is a drill-ready project to test and extend historic oxide Cu intersections of 10m @ 1.57% Cu and 32 g/t Ag, and 5.2m @ 1.45% Cu and 25 g/t Ag from hole M7 in the early 70’s, and 4m @ 1.27% Cu and 23.4 g/t Ag from hole MRRC020 in the mid-2000’s. Mineralisation at Mutooroo Ridge bears characteristics of both VHMS and sediment-hosted Cu-Co deposits.

EL6230 is located near the eastern limit of the Neoproterozoic Adelaidean sequence that unconformably overlies the Paleoproterozoic Willyama Complex of the Curnamona Craton.

During the first year of tenure, Westrock completed a 608 sample infill and extension soil sampling program. Historic and Westrock’s own soil sampling results have defined Cu in soil anomalism over a strike length of approximately 4 km, consisting of multiple parallel zones in places.

Outcropping Adelaidean sequence in EL6230 has been metamorphosed to mid-greenschist facies, with dominant foliation and lithological contact striking to NE and consistently dipping steeply to the NW. The eastern portion of the northern half of the ridge is dominated by a 6km long rhyolite-dacite body that is flanked by a unit of chlorite-biotite schist in the west, interpreted to be metamorphosed andesite. The western portion of the ridge is dominated by a sequence of conglomerate and sandstone and its metamorphosed equivalents, and slivers of undifferentiated chlorite-biotite schist, possibly of volcanogenic in origin.

Copper mineralisation on the surface at the Ridge prospect (M7) occurs as minor thin gossanous quartz veins and patches of malachite staining. In drill holes, copper appears to be within a 50m thick dacitic tuff unit. The mineralisation transitions from schistose parallel sulphide stringers of pyrite-chalcopyrite with accompanying qutartz, tourmaline and carbonate, to malachite-bornite-chalcocite (minor) in the oxide zone. Sulphide mineralisation occurs in 2-10m thick zones, associated with siliceous alteration.

Based on soil geochemistry and historic drilling results, Westrock plans to carry out a RC drilling program to extend the known mineralisation, and test addition targets.