Authors: Salvoni, M; Morkel, IG; Dight, PM
Editors: Dight, PM
Conference: First Asia Pacific Slope Stability in Mining Conference, 6–8 September, Brisbane
Published: Australian Centre for Geomechanics, Proceedings of the First Asia Pacific Slope Stability in Mining Conference, pp.639-655, Perth
Over the years there have been several attempts to undertake routine real-time microseismic monitoring of open pit mine slopes. This technique has been commonly used in underground operations to manage induced seismicity and rockburst. However, the microseismic monitoring in open pits is still experimental and further studies are required. In this paper, we analysed the data from MMG Century mine where, in November 2013, a microseismic system was installed in order to monitor a large scale unstable slope. Design of the system and installation of the instruments were performed by the Institute of Mine Seismology. The seismic events were recorded, based both on a triggered scheme and in continuous mode. As part of our research project, data was given to four independent groups to be analysed and provide their own results. One group applied a routine method using the triggered data, manually processed them and made them available for the engineers on site within 10 minutes. The other three groups later reanalysed the data using both triggered and continuous waveform. Our work compared the different results obtained, and highlighted some of the key points engineers should be aware of in the design and implementation of a microseismic system in open pit mines.
Keywords: microseismic monitoring, routine method, continuous data processing
Salvoni, M, Morkel, IG & Dight, PM 2016, 'Microseismic data — a comparison between routine trigger method and continuous data processing', in PM Dight (ed.), Proceedings of the First Asia Pacific Slope Stability in Mining Conference
, Australian Centre for Geomechanics, Perth, pp. 639-655.
Broadbent, GC, Andrews, SJ & Kelso, IJ 2002, ‘A decade of new ideas: geology and exploration history of the Century Zn‐Pb‐Ag deposit, Northwestern Queensland, Australia’, in RJ Goldfarb & RL Nielson (eds), Integrated methods for discovery: global exploration in the twenty‐first century, Society of Economic Geologists, Inc., Special Publication 9, pp. 119–140.
Franklin, JA 1981, ‘A shale rating system and tentative applications to shale performance’, Transportation Research Record, 790, pp. 2–12.
Hardy Jr, HR, Belesky, RM, Kimble Jr, EJ, Mrugala, M, Hager, ME & Taioli, F 1988, A study to investigate the potential of the acoustic emission/microseismic technique as a means of evaluating slope stability, Final Report (No. FHWA-PA-87-029+ 83-35).
Hendersonhall, BD, Lucas, D, Kerr, N & Pennisi, C 2010, ‘Practical Management of Progressive Large Failures at Minerals and Metals Group Century Mine’, in Proceedings of the 7th Large Open Pit Mining Conference, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 15–30.
Hudyma, MR, Jiang, JJ & Reimnitz, M 2003, ‘Seismic monitoring at the Fimiston open pit Kalgoorlie Consolidated Gold Mines (KCGM)’, in Proceeding of 5th Open Pit Mining Conference, Australasian Institute of Mining and Metallurgy, Melbourne.
Kagan, MM, Kozyrev, AA & Chernobrov, DS 2013, ‘Results related to pitwall microseismic monitoring ("Zhelezny" Mine, Kovdorsky Gok, JSC)’, in A Malovichko & D Malovichko (eds), Proceedings of the 8th Symposium on Rockbursts and Seismicity in Mines, Saint-Petersburg-Moscow, Russia, pp. 501–504.
Kurukuk, N & Sweeney, E 2012, ‘Slope Stability Assessment at an open pit mine in Northwest Queensland, in Proceedings of the 9th ANZ Young Geotechnical Practitioners Conference (9ANZYGPC), Australian Geomechanics Society, Barton, p. 9.
Lynch, RA, Wuite, R, Smith, BS & Cichowicz, A, 2005, ‘Microseismic monitoring of open pit slopes’, in Y Potvin & M Hudyma (eds), Proceedings of the 6th Symposium on Rockbursts and Seismicity in Mines, Australian Centre for Geomechanics, Perth, pp. 581–592.
Mendecki, AJ, 1997, ‘Seismic monitoring in mines’, Springer Science & Business Media.
Mendecki, AJ, Lynch, RA & Malovichko, DA 2010, ‘Routine Micro-Seismic Monitoring in Mines’, in Proceedings of the Australian Earthquake Engineering Society 2010 Conference, Perth.
Meyer, S 2015, ‘Slope deformation mechanics from microseismic monitoring’, in Proceedings of the 2015 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, SAIMM, pp. 181–193.
Sainsbury, B, Hebert, Y & Sainsbury, D 2013, ‘Assessment of the Long-Term Stability of the Stage 8 West Wall Cutback at MMG Century’, Itasca internal report.
Salvoni, M & Dight, PM 2016, ‘Rock damage assessment in a large unstable slope from microseismic monitoring-MMG Century mine (Queensland, Australia) case study’, Engineering Geology, vol. 210, pp. 45–56.
Trifu, C, & Shumila, V 2005, Comparison of Accelerometer and Geophone Recordings of Induced Seismicity at Mt. Keith Open Pit Mine, Western Australia, internal ESG report to Mount Keith.
Trifu, CI & Shumila, V, 2010, ‘Geometrical and inhomogeneous raypath effects on the characterization of open-pit seismicity’, in 44th US Rock Mechanics Symposium and 5th US-Canada Rock Mechanics Symposium 2010, American Rock Mechanics Association.
Vinoth, S & Kumar, LA 2014, ‘Applying real time seismic monitoring technology for slope stability assessment - An Indian opencast coal mine perspective’, International Journal of Mining Science and Technology, 24, pp. 75–80.
Waltho, AE & Andrews, SJ 1993, ‘The Century zinc‐lead deposit, Northwest Queensland’, in IJ Duncan (ed.), Proceedings of the Australasian Institute of Mining and Metallurgy Centenary Conference, Australasian Institute of Mining and Metallurgy, Carlton, pp. 41–61.
Wesseloo, J & Sweby, G 2008, ‘Microseismic monitoring of hard rock mine slopes’, in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, pp. 433–450.