Challa South – Base Metals and Vanadium
The Challa South Project covers the southern part of the Narndee LIC, and surrounding supracrustal rocks. It covers a broad regional basin structure approximately 30 km wide. The oldest rocks belonging the Yaloginda Formation is interpreted to occur to the north and east. This formation consists of a rhyolite, fine to medium grained felsic volcanoclastic sedimentary rocks, with interbedded units of ferruginous shales and banded iron formation.
The contact between the Yaloginda Formation and younger Narndee LIC is not exposed, and the older rocks may form a roof pendant over the intrusive complex.
The southern part of the project area covers the Lower and Middle Zone of the Narndee LIC. The Middle zone comprises a cyclically layered pyroxenite and gabbro-norite sequence. The Lower Zone, which is a zone approximately 2 kilometres thick, and comprises cyclically layered peridotite, pyroxenite, gabbronorite and anorthosite. The cyclical nature of these units attests to the periodic introduction of new pulses of less evolved parental magma into the more evolved resident magma within the main chamber. The eastern side of the project area is interpreted to contain a raft of the upper Windimurra LIC that has been offset from the main body by regional scale faulting.
Granitic rocks belonging to the Mount Kenneth Group intrude the sequence.
Yalanga Bore - Copper/Zinc
Yalanga Bore was explored by Duval Mining (Australia) Limited (“Duval”) in 1983-1984. The Duval work is documented in WAMEX report A15951 and comprised geological mapping, surface sampling, ground magnetics, a low powered electromagnetic system (EM37) and drilling. Drilling comprised 68 shallow RAB holes (2,224m), 4 percussion holes (370m), 4 rotary mud holes (153m) and one diamond tail (140m). The Company has located the diamond hole collar YBD1 and percussion holes (YBP69-YBP74) in the field however there are no corresponding samples available.
Duval did not report the sampling and assay methods but did provide limited drill assay data showing a steeply dipping zone of elevated copper ranging from 500ppm to 7,950ppm and Zinc ranging from 1,000ppm to 6,850ppm. This zone was logged as gossan by the Duval geologists. One diamond drill hole (YBD1) was completed below the gossan zone with the geological logs noting disseminated to semi massive pyrite, pyrrhotite, chalcopyrite and sphalerite. The diamond core is not available and was only selectively sampled by Duval with narrow moderately anomalous zinc and copper reported.
The Company believes the copper and zinc results reported by Duval may indicate the presence of a VMS copper-zinc deposit at depth below the weathered zone. The mineralization is open along strike and at depth. Following the end of the period, the Company completed a MLEM survey at Yalanga Bore that has successfully defined a strong conductor north of the zinc and copper mineralisation intersected in the historic Duval percussion and diamond drilling (Figure 2). The modelled conductor plate is shallow (100m) and immediately adjacent to the drilling but has not been effectively tested by the previous drilling.
Watson's Well – Vanadium
Initial mapping has discovered meta-gabbro outcrop and magnetite banding at Watson’s Well within a broader 5km long magnetic anomoly. Recent rock chip sampling has shown peak values up to 1.64% Vanadium Pentoxide (V2O5). 21 MagLag samples have been taken by Santa Fe and returned grade between 0.56% and 1.23% V2O5 (average grade 0.96% V2O5). In light of this, the Company is now investigating the potential for Windimurra style Vanadium/Magnetite/Titanium mineralisation.