Wall control blasting practices at the EkatiTM diamond mine

Abstract A review of blast designs and improved blasting practices at the EkatiTM diamond mine is presented along with the results of three blast-monitoring experiments. Blast monitoring was undertaken to investigate blast damage mechanisms in the mineÕs well jointed rock mass. Rock mass damage caused by production, pre-shear and wall control blasts was measured. EkatiTM uses 270 mm holes for production blasting, and 165 mm holes loaded with a decoupled charge for pre-shearing. The production blasts are loaded with bulk emulsion/ANFO blends. The mine plan involves using 30 m double benches. A 30 m high pre-shear is drilled and blasted prior to the production blasting that is done with sequential 15 m benches. This paper summarizes the monitoring equipment and data gathered to date.
Keywords: Ekati, Blast monitoring, Blast designs, Rock mass damage, Production blasting.
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Summary: This paper summarizes the results of numerical studies on drift stability in moderately jointed rock masses. It investigates the relative pertinence of geomechanical factors such as joint orientation, spacing and stress regime. This is undertaken using a distinct element model and a series of parametric studies.
Publication: CIM Bulletin
Author(s): M. Grenon, J. Hadjigeorgiou, J.P. Harrison
Keywords: Drift stability, Joint orientation, Spacing, Stress regime, Displacement.
Issue: 1050
Volume: 94
Year: 2001
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Summary: Spray-on polymer linings, as partial or full replacement for traditional forms of area rock support, have seen rapid growth in interest within Canada. A wide variety of lining types, ranging from polymer chemical to water-based cementitious materials, have been developed and commercially introduced to the underground mining market. Following approximately one decade of development work, several general conclusions have been reached regarding the performance of this class of area support...
Publication: CIM Bulletin
Author(s): J.F. Archibald, D.O. DeGagné
Keywords: Spray-on polymer linings, Underground mining, Health and safety, Support, Operational considerations, Cost benefits.
Issue: 1050
Volume: 94
Year: 2001
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Summary: A laboratory investigation was undertaken to evaluate the effectiveness of different binding agents in a paste backfilling operation suitable to be used in a sulphide-rich environment. Different combinations of Portland cement and fly ash type C as well as ferrous slag were used as the binding agents. The unconfined compressive strength of the samples was measured for extended curing periods. The results indicate that the addition of 3% slag in the binding agent mix could produce strengths up...
Publication: CIM Bulletin
Author(s): F.P. Hassani, J. Ouellet, M. Hossein
Keywords: Paste backfill, Portland cement, Binding agents, Sulphate, Slag.
Issue: 1050
Volume: 94
Year: 2001
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