Authors: Townend, S; Sampson-Forsythe, A


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Townend, S & Sampson-Forsythe, A 2014, 'Mitigation strategies for mining in high stress sill pillars at Coleman Mine – a case study', in M Hudyma & Y Potvin (eds), Deep Mining 2014: Proceedings of the Seventh International Conference on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 65-77,

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Coleman Mine, a nickel/copper producing mine for Vale in the Sudbury mining district, is a mature mine that has been in continuous production since 1991. This maturity is reflected in the amount of ore that has been mined from several major ore zones and the number of associated sill pillars, many of which are being mined or are about to be mined. In the main nickel orebody one sill pillar is being mined and two more will start to be mined within the next year. In the main copper orebody three sill pillars are being mined with one more about to be mined. With sill pillars, and other diminishing pillars, there are problems with increased stress conditions that have the potential to lead to major seismic events prior to the complete failure of the pillar. This paper describes the different mitigation strategies that have been put in place at Coleman mine to minimise the risk of major ground instabilities caused by high stress conditions associated with sill pillars.

Espley, S, Courchesne, T & Castro, L 1996, McCreedy East Mine Main Zone: Rock Mechanics Study, Inco Mines research report, Inco Ltd.
Golder Associates Ltd. 2007, MOB1 – Sill Pillar McCreedy East Mine, report submitted to Vale, Golder Associates Ltd., Sudbury.
Hosseini, Z 2010, Geomechanics Study: MOB2 & MOB3 Sill Pillars at Coleman Mine, Vale internal report.
Itasca Consulting Canada, Inc. 2009, 153 Orebody Mining and Geotechnical study for 4550 and 4700 Levels Crown Pillar Recovery, report submitted to Vale, Itasca Consulting Canada, Inc., Sudbury.
Itasca Consulting Canada, Inc. 2012, Coleman Mine MOB1 Numerical Modelling Results, report submitted to Vale, Itasca Consulting Canada, Inc., Sudbury.
Pakalnis, R, Caceres, C, Clapp, K, Morin, M, Brady, T, Williams, T, Blake, W & MacLaughlin, M 2005, ‘Design Spans – Underhand
Cut-and-fill Mining’, presentation at the 107th CIM-AGM, Toronto, April 2005.
Stone, DMR 1993, ‘The optimization of mix designs for cemented rockfill’, in HW Glen (ed.), Proceedings of the Fifth International Symposium on Mining with Backfill, South African Institute of Mining and Metallurgy, Johannesburg, pp. 249-253.

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