Geochemistry and geotechnical models – a case study from the proposed Kempfield Silver Project, Bathurst, New South Wales

Authors: Baxter, H; Rutherford, T; Bertuzzi, R Download Paper

DOI https://doi.org/10.36487/ACG_rep/1308_12_Rutherford

Cite As:
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



Abstract:
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.

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