Abstract
There is no reason to question the fact that pulling from the cave resulted in fracturing the rock mass around the mine. Above the mine this process is validated by the fact that there was and still by the end of 2015 is production from the cave. If above the mine the rock mass would form one or a limited number of blocks then it would not be possible to mine out such rock mass. This is obvious. The rock mass above the mine was fractured and this fracturing process was recorded in form of seismicity. Seismicity was recorded not only from above the mine but also from below the mine. What more the amounts of recorded seismicity above and below the mine are not random in size and distribution but follow a specific consistent pattern. This pattern is controlled by the caving process and its milestones. From the beginning of 2002 until the end of 2013 about 50 % of the recorded seismicity, released seismic energy and seismic moment took place below the extraction level. This seismicity at some stage migrated down to −1200 m. This elevation will be the future Lift 2 Mine extraction level. In this chapter I have compared the seismicity recorded above the mine extraction level where the caving process took place and the rock mass was successfully mined out with that recorded below the mine. The rock mass below the mine will become Lift 2 cave. The main conclusion from this analysis is that the top volume of the potential Lift 2 rock mass is already de-stressed/preconditioned and fractured so it will cave rather than form an arch that will not cave resulting in the formation of a significant air void.
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References
Brown ET (2003) Block caving geomechanics. Chapter 8. In: Geomechanical monitoring. Julius Kruttschnitt Mineral Research Centre, The University of Queensland, Australia
Brummer R, Li H, Moss A (2006) The transition from open pit to underground mining: an unusual slope failure mechanism at Palabora. In: Proceedings international symposium on stability of rock slopes. Cape Town, pp 411–420
Gibowicz SJ, Lasocki S (2001) Seismicity induced by mining: ten years later. In: Advances in geophysics, vol 44. Academic Press, New York
Glazer SN (2008) Seismically active volume around the cave and its relation to the caving stages. In: Schunnesson H, Nordlung E (eds) Proceedings of 5th international conference and exhibition on mass mining. Luleå, Sweden, 9–11 June 2008. Luleå University of Technology, pp 983–992
Glazer SN, Hepworth N (2004) Seismic Monitoring of Cave Crown Pillar—Palabora Mining Company, RSA. In: Karzulowicz K, Alfaro MA (eds) MassMin 2004 proceedings. Chile, Mineria Chilena, Santiago, pp 565–569
Glazer SN, Hepworth N (2005) Seismicity induced by cave mining, Palabora experience. In: Potwin Y, Hudyma M (eds) Sixth international symposium on rockburst and seismicity in mines proceedings. Australian Centre for Geomechanics, pp 281–289
Glazer SN, Hepworth N (2006) Crown pillar failure mechanism—case study based on seismic data from Palabora. In: Mining technology 2006, vol 115. Institute of Materials Minerals and Mining, Published by Maney, pp 75–84
Glazer SN, Townsend P (2008) The application of seismic monitoring to the future lift 2 development at Palabora Mining Company. In: Schunnesson H, Nordlung E (eds) Proceedings of 5th international conference and exhibition on mass mining, Luleå, Sweden, 9–11 June 2008. Luleå University of Technology, pp 919–930
Glazer SN, Townsend PA (2010) Relationship between production rates, the caving process and seismicity rates at Palabora Mining Company. In: Jan MVS, Potwin Y (eds) Proceedings of the fifth international seminar on deep and high stress mining, 6–8 Oct 2010. Santiago, Chile, pp 491–502
Mendecki AJ (ed) (1997) Seismic monitoring in mines. Chapman and Hall, London
Moss A, Russell F, Jones C (2004) Caving and fragmentation at Palabora: prediction to Production. In: Karzulowicz K, Alfaro MA (eds) MassMin 2004 proceedings. Mineria Chilena, Santiago, Chile, pp 585–590
Moss A, Diaczenko S, Townsend P (2006) Interaction between the block cave and the pit slopes at mine. In: Proceedings international symposium on stability of rock slopes ion open pit mining and civil engineering, 3–6 April 2006, Cape Town, South Africa, SAIMM symposium series S44, pp 399-410
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Glazer, S.N. (2016). Seismic Preconditioning Below Lift 1 and Its Influence on the Cavability of Lift 2 Cave. In: Mine Seismology: Data Analysis and Interpretation. Springer, Cham. https://doi.org/10.1007/978-3-319-32612-2_10
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DOI: https://doi.org/10.1007/978-3-319-32612-2_10
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