Baxter, H, Rutherford, T & Bertuzzi, R 2013, 'Geochemistry and geotechnical models – a case study from the proposed Kempfield Silver Project, Bathurst, New South Wales', in PM Dight (ed.), Slope Stability 2013: Proceedings of the 2013 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering
, Australian Centre for Geomechanics, Perth, pp. 249-259, https://doi.org/10.36487/ACG_rep/1308_12_Rutherford
This paper presents a case study on the proposed Kempfield Silver Project where geochemistry was used to define sub-surface fault structure orientation. The Kempfield site is located within the Hill End Trough along the eastern margin of the Lachlan Fold Belt. Surface outcrop is sparse with mapping mostly limited to lithology. However, similarities in the alteration of the lithologies limited their use in correlating faults. Geochemical assays of chip samples were made for over 35 minerals/elements, including aluminium, titanium, potassium, calcium and iron. Using Vulcan to view boreholes in 3D, the amounts of each element was assessed for correlations that may define changes in lithology, alteration or the presence of structures. Iron grades (Fe) proved the most favourable for the identification of structures at depth, with a distinct correlation of lithology with >5% Fe on the hanging wall of faults and <5% on the footwalls. The fault dips indicated by the geochemical assessment were commensurate with fault orientations from oriented core. This information was then factored into the geotechnical model and used as part of the slope stability analysis.
Collins, W.J. (2002) Nature of extensional accretionary orogens, Tectonics, American Geophysical Union, Vol. 21(4), pp. 6-1 to 6-12.
Downes, P.M. and Seccombe, P.K. (2004) Sulfur isotope distribution in late silurian volcanic-hosted massive sulfide deposits of the Hill End Trough, Eastern Lachlan Fold Belt, New South Wales, Australian Journal of Earth Sciences, Taylor & Francis, Vol. 51(1), pp. 125–141.
Foster, D.A., Gray, D.R. and Bucher, M. (1999) Chronology of deformation within the turbidite-dominated, Lachlan Orogen: Implications for the tectonic evolution of eastern Australia and Gondwana, Tectonics, American Geophysical Union, Vol. 18(3), pp. 452–485.
Lennox, P.G., Trzebski, R., Armstrong, R. and Siebel, W. (2005) Structural evolution and granite chronology of the central Molong Zone, Eastern Lachlan Fold Belt, Australia, Australian Journal of Earth Sciences, Taylor & Francis, Vol. 52(1), pp. 79–99.
Timms, D. and David, V. (2011) Kempfield silver, barite and base metal (Pb–Zn) deposit, Lachlan Orogen, Eastern Australia, in Proceedings Eighth International Mining Geology Conference, 22–24 August 2011, Queenstown, New Zealand, Australasian Institute of Mining and Metallurgy, Carlton, pp. 211–224.
Wyborn, D. and Henderson, G.A.M. (1997) Blayney 1:100 000 Geological Sheet 8730, 1st edition, Geological Survey of New South Wales.