Authors: de Vries, R; Hassell, R; Player, J
Editors: Potvin, Y
Conference: International Seminar on Design Methods in Underground Mining, 17-19 November, Perth
Published: Australian Centre for Geomechanics, Proceedings of the International Seminar on Design Methods in Underground Mining, pp.167-184, Perth
Concerns regarding the uncertainty of stope dilution at the MMG Limited’s Dugald River underground mine led to a trial stoping program to acquire full-scale comprehensive geotechnical information and to test the validity of the geotechnical and mining parameters. A total of 19 stopes were mined by sublevel open stoping with cemented rockfill (CRF). Specific studies were completed on the rock mass response to mining, rock stress and property measurements, stope blast vibration monitoring, production drilling deviation, CRF optimisation, relogging of diamond core for structural and geotechnical information. Based on the trial stoping results, key geotechnical inputs into mine design and scheduling were provided. These included:
The considerable volume of data and the practical experience gained during the trial mining greatly increased the geotechnical knowledge of the rock mass and its response to mining. This allowed for a wide range of geotechnical design considerations to be applied to the project feasibility study at a higher confidence level.
de Vries, R, Hassell, R & Player, J 2015, 'Geotechnical design considerations for Dugald River — from slot to sequence', in Y Potvin (ed.), Proceedings of the International Seminar on Design Methods in Underground Mining
, Australian Centre for Geomechanics, Perth, pp. 167-184.
Barton, N, Lien, R & Lunde, J 1974, ‘Engineering classification of rock masses for design of tunnel support’, Rock Mechanics and Rock Engineering, vol. 6, no. 4, pp. 189-236.
Bieniawski, ZT 1989, Engineering rock mass classifications, John Wiley & Sons, New York.
Capes, G 2009, ‘Open stope hangingwall design based on general and detailed data collection in rock masses with unfavourable hangingwall conditions’, PhD thesis, University of Saskatchewan.
Carswell, J, Player, J, de Vries, R, & Hassell, R 2015, Sublevel open stoping hanging wall Instrumentation Program at the Dugald River underground mine, in PM Dight (ed.), Proceedings of the Ninth International Symposium on Field Measurements in Geomechanics, Australian Centre for Geomechanics, Perth, pp. 551-564.
Hassell, R, Villaescusa, E, de Vries, R, & Player, J 2015, ‘Stope blast vibration analysis at the Dugald River underground mine’, Proceedings of the 11th International Symposium on Rock Fragmentation by Blasting (Fragblast 11), The Australasian Institute of Mining and Metallurgy, Melbourne.
Mitchell, RJ, Olsen, RS & Smith, JD 1982, ‘Model studies on cemented tailings used in mine backfill’, Canadian Geotechnical Journal, vol. 19, pp. 14-28.
Terzaghi, K 1943, Theoretical soil mechanics, John Wiley & Sons, Inc., New York, NY.