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1	Design spans - underhand cut and fill mining
Authors	Pakalnis-R; Caceres-C; Clapp-K; Morin-M; Brady-T; Williams-T; Blake-W; MacLaughlin-M
Source	Mining Rocks! 107th CIM-AGM, April 24-27, 2005, Toronto, Ontario, Canada. Montreal, Quebec, Canada: Canadian Institute of Mining, Metallurgy and Petroleum, 2005 Apr; :1-9
Link	http://www.cdc.gov/niosh/mining/pubs/pubreference/outputid1663.htm
NIOSHTIC No.	20030309
Abstract	This paper describes a focus of work presently being conducted at the Rock Mechanics Research Group at the University of British Columbia. The underhand method under consolidated fill ensures a high recovery under an engineered back that is comprised of cemented rock fill and/or cemented paste fill. This method of mining is generally necessary either due to a weak rock mass comprising the immediate back and/or high induced back stresses. A major concern in the design of sill mats is the loading and strengths associated with the overlying sill mat. This paper reviews past practice coupled with present observations and measurements from over ten(10) mines throughout North America. It outlines areas of concern in terms of design requirements.
Keywords	Miners; Mining-industry; Mine-seals; Rock-mechanics; Cements; Back-injuries; Mine-workers; Ground-stability; Ground-control; Simulation-methods; Analytical-methods; Case-studies

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