Trial underhand longwall stope instrumentation and model calibration at the Lucky Friday Mine, Mullan, Idaho, USA.
Whyatt-JK; Williams-TJ; Pariseau-WG
Rock Mechanics: Proceedings of the 33rd U.S. Symposium, Santa Fe, New Mexico, June 3-5, 1992. Rotterdam, Netherlands: A.A. Balkema, 1992 Jun; :511-519
The U.S. Bureau of Mines, in cooperation with Hecla Mining Company, has monitored backfill performance and ramp stability during mining of several cuts of an experimental underhand longwall stope in the Lucky Friday Mine, Mullan, Idaho. This mining method was designed to increase productivity by introducing mechanized mining equipment and to reduce rock burst hazards associated with excavating isolated pillars. The data were also used to calibrate a three-dimensional, finite-element model of the lower portion of the Lucky Friday Mine and allowed the refinement of rock mass properties from an earlier two-dimensional model. The data collected, in conjunction with observations, ongoing mining experience, and the calibrated model, allowed researchers to demonstrate the geomechanical soundness of the method and led to its adoption throughout the mine. This case study demonstrated the desirability of building a model prior to specifying placing instruments.
Mining-industry; Models; Underground-mining; Rock-bursts; Rock-mechanics; Rock-falls; Mining-equipment
Rock Mechanics: Proceedings of the 33rd U.S. Symposium, Santa Fe, New Mexico, June 3-5, 1992