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Characteristics of Mining-induced Seismicity and Rock Bursting in a Deep Hard-rock Mine.

Authors
Swanson-PL; Sines-CD
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9393, 1991 Jan; :1-12
Link
NIOSHTIC No.
10002970
Abstract
Over a recent 20-month observation period, seismogram records were obtained from a single vertical-component short-period seismometer installed at the surface of a metal mine in the Coeur d'Alene mining district of northern Idaho. The seismic events were analyzed for magnitude, time of occurrence, location, and relation to rock bursting and production blasting. Approximately 150 seismic events with local magnitude (M) ranging from -0.5 to 2.9 were located within the mine, yielding a b-value (slope of the logarithm of the number of events with magnitude greater than M versus M) of 0.5. Event locations were constrained using a dense underground array of high-frequency accelerometers. Twenty of the surface-recorded events, with magnitudes ranging from +0.5 to 2.9, were associated with rock bursts that produced damage requiring at least one-half day of clean up and/or repair. Other possibly hazardous rock bursts, with magnitudes as small as -1.1, were numerous, especially at the working face, but were not associated with significant structural damage.
Keywords
Mining-engineering; Blasting; Seismic-waves; Damage; Frequencies; Mathematical-models; Idaho; Seismographs; Rock-bursts; Mining; Seismic-effects
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB92-158021
NTIS Price
A03
Identifying No.
RI-9393
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9393
State
CO; ID
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