In May 2004 the Minister for the Department of Environment and Heritage purchased Bimbowrie Station pastoral lease. The station was purchased because it encompasses part of the Olary Ranges, which is part of the environmentally important Broken...
In May 2004 the Minister for the Department of Environment and Heritage purchased Bimbowrie Station pastoral lease. The station was purchased because it encompasses part of the Olary Ranges, which is part of the environmentally important Broken Hill Complex Region. However, the region is known to be prospective for minerals, and for this reason the entire Bimbowrie Station lease area is presently encumbered under mineral exploration licences and applications. In addition to the mineral exploration licences, there is one operating feldspar mine. Minerals and Energy Resources (PIRSA) have lately been focussing their field and data compilation efforts to demonstrate and characterise the mineral prospectivity of Bimbowrie Station. A preliminary report on this data is here presented to provide information to mineral explorers and to government managers of the planned dual proclamation conservation park. Recent field work has highlighted new mineral occurrences that were previously unrecorded, and has demonstrated that particular kinds of mineral prospective geology extend from Broken Hill across to Bimbowrie Station. Assay results of samples collected from both previously known and new mineral occurrences show distinctly elevated Au, Cu and Zn values, as do recently compiled mineral exploration company stream sediment geochemistry samples. Rock chip samples have returned assay values of up to 11.7% Cu and 14 g/t Au, thereby demonstrating a considerable potential for these rocks to host economic copper-gold mineralisation. PIRSA and company geological mapping, map compilation and aeromagnetic imagery interpretation have shown that known mineral-bearing stratigraphic units are present on Bimbowrie Station, thus indicating a considerable potential for finding economic Zn-Pb-Ag, uranium and feldspar deposits. Regolith landform mapping has demonstrated that the underlying Palaeo- to Neoproterozoic rocks are the dominant sources of the regolith sediments, implying that anomalous Au and Cu values seen in calcrete geochemistry samples are related to these sources, and thus require further investigation. New mapping of Neoproterozoic strata has highlighted classic features of the worldwide Sturtian glacial event. This mapping, when completed, will divulge important historical information concerning not only the palaeoclimate but also the tectonic evolution of this region. Further mapping of Palaeo- to Mesoproterozoic, Neoproterozoic and regolith geology, plus the collection and analysis of geochemical data for key stratigraphic units, the locating of mine workings and drillholes, summarizing of all open file exploration information, and the production of metallic and non-metallic mineral potential maps, are all still required to comprehensively describe the mineral potential of Bimbowrie Station.
More +