Authors: Sainsbury, B; Sainsbury, D; Carroll, D

Open access courtesy of:


Cite As:
Sainsbury, B, Sainsbury, D & Carroll, D 2018, 'Back-analysis of PC1 cave propagation and subsidence behaviour at the Cadia East mine', in Y Potvin & J Jakubec (eds), Caving 2018: Proceedings of the Fourth International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 167-178,

Download citation as:   ris   bibtex   endnote   text   Zotero

Based on the successful initiation and breakthrough to surface of the PC1 cave at Cadia East, a backanalysis of the performance was conducted to confirm design parameters to optimise the future draw strategy. A minescale numerical model was developed to calibrate the existing caving and subsidence behaviour associated with the initiation of PC1 and development of the crater. The successful calibration of historical conditions has provided significant confidence in the caving and subsidence predictions associated with future draw strategies. It has also validated a methodology to simulate the effects of preconditioning in large-scale models.

Keywords: caving, subsidence, PC1, Cadia East, numerical modelling, preconditioning

Board, M, Chacon, E, Varona, P & Lorig, L 1996, ‘Comparative analysis of toppling behaviour at Chuquicamata open pit mine, Chile’, Transactions Institute of Mining and Metallurgy, Section A, vol. 105, A11–A21.
Cavieres, P, Gaete, S, Lorig, L & Gómez, P 2003, ‘Three-dimensional analysis of fracturing limits induced by large scale underground mining at El Teniente mine’, in P Culligan, HH Einstein and AJ Whittle (eds), Proceedings of the 39th U.S. Rock Mechanics Symposium (Soil and Rock America 2003), Verlag Glückauf, Essen, pp. 893–900.
Jeffrey, RG, Bunger, A, LeCampion, B, Zhang, X, Chen, Z, van As, A, … Mainguy, M 2009, ‘Measuring hydraulic fracture growth in naturally fractured rock’, Proceedings of the 2009 SPE Annual Technical Conference and Exhibition, Society of Petroleum Engineers, Richardson,
Laubscher, DH, 1994, ‘Cave mining – the state of the art’, Journal of the South African Institute of Mining and Metallurgy, vol. 94, no. 10, pp. 279–293.
Lee, M 2012, Cadia East – Review of Rock Stress Measurements, AMC Consultants Pty Ltd report 111153: February 2012 to Newcrest Mining Limited, AMC Consultants Pty Ltd.
Lupo, JF 1998 ‘Large-scale surface disturbances resulting from underground mass mining’, International Journal Rock Mechanics and Mining Science, vol. 35, no. 4–5, paper no. 25.
Pierce, M, Cundall, P, Mas Ivars, D, Darcel, C, Young, RP, Reyes-Montes, J & Pettitt, W 2006, Mass Mining Technology Project: Six Monthly Technical Report, Caving Mechanics, Sub-Project No. 4.2: Research and Methodology Improvement, and Sub-Project 4.3, Case Study Application, ICG06-2292-1-Tasks 2-3-14, Itasca Consulting Group Inc.
Pierce, M, Cundall, P, Potyondy, D & Mas Ivars, D 2007, ‘A synthetic rock mass model for jointed rock’, in E Eberhardt, D Stead & T Morrison (eds), Proceedings of the 1st CanadaUS Rock Mechanics Symposium, Rock Mechanics: Meeting Society's Challenges and Demands, vol. 1, American Rock Mechanics Association, Alexandria, pp. 341–349.
Sainsbury, D & Lorig, L 2005, Caving Induced Subsidence at the Abandoned Grace Mine, confidential Itasca Consulting Group report to Arcadia Land Company.
Sainsbury, D, Sainsbury, B, Board, M & Loring, D 2011, ‘Numerical back analysis of structurally controlled cave initiation at propagation at the Henderson Mine’, in AT Innacchione, GS Esterhuizen & AN Tutuncu (eds), Proceedings of the 45th US Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, Alexandria.
Sainsbury, B 2012, A Model for Cave Propagation and Subsidence Assessment in Jointed Rock Masses, PhD thesis, University of New South Wales, Kensington.
Sainsbury, B & Stöckel, B-M, 2012, ‘Large-scale caving and subsidence assessment at the Kiirunavaara Lake Orebody’, Proceedings of MassMin 2012, Canadian Institute of Mining, Metallurgy and Petroleum, Westmount.
Sainsbury, D, Sainsbury, B, Paetzold H-D, Lourens, P & Vakili, A 2016, ‘Cave propagation and subsidence behaviour of Lift 1 at the Palabora block cave mine’, Proceedings of MassMin 2016, The Australasian Institute of Mining and Metallurgy, Melbourne.
Sainsbury, B & Sainsbury, D 2017, ‘Practical use of the ubiquitous-joint constitutive model for the simulation of anisotropic rock masses’, Rock Mechanics and Rock Engineering, vol. 50, no. 6, pp. 1507–1528,
van As, A, Davison, J & Moss, I 2003, Subsidence Definitions for Block Caving Mines, Rio Tinto Technical report, 59 p.

© Copyright 2024, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
View copyright/legal information
Please direct any queries or error reports to