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Wallrock Reactions to Mining Beyond a Preconditioned Zone At the Star Mine, Burke, Idaho.
NTIS: PB/81-214355 :45 pages
Rock preconditioning in advance of mining has been an effective means of rock-burst control based on the results of field demonstrations carried out on the 7700 level of the Hecla Mining Company's Star Mine. Mining through the preconditioned zone was characterized by greatly reduced rates of released seismic energy and no bumping or rock bursting occurred within the preconditioned zone. Mining above the preconditioned zone was characterized by greatly increased rates of released seismic energy and rock bursting, particularly where the vein became very narrow in waste zones. This increased incidence of rock bursting points out the need for stope preconditioning to be carried out on an entire stope block basis.
CP; Final Contract Report;
NTIS Accession No.
Page last reviewed: October 29, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division