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Investigation of electromagnetic emissions in a deep underground mine.

Authors
Scott-DF; Williams-T; Knoll-S
Source
Controlling Seismic Risk: Sixth International Symposium on Rockburst and Seismicity in Mines, Perth Australia, March 9-11, 2005. Potvin T, Hudyma M, eds., Crawley, Western Australia, Australia: Australian Centre for Geomechanics, 2005 Mar; :593-599
NIOSHTIC No.
20029168
Abstract
Highly stressed rock in stopes continues to be a primary safety risk for miners in underground mines because it can result in failures of ground that lead to both injuries and death. Spokane Research Laboratory personnel investigated electromagnetic (EM) emissions in a deep underground mine in an effort to determine if these emissions could be used as indicators of impending catastrophic ground failure. Results suggest that (1) there is no increase in the number of EM emissions prior to recorded seismic activity, (2) some EM signals are generated during blasting, (3) interference from mine electrical sources mask seismic-generated EM signals, (4) EM emissions do not give enough warning (compared to seismic monitoring) to permit miners to leave a stope, (5) the distance an EM signal can travel in the rock is between 18 and 40 m, and (6) current data acquisition systems do not differentiate between EM signals generated from seismic activity and random mine electrical noise. These results preclude monitoring EM emissions as precursors of impending catastrophic ground failure.
Keywords
Mining-industry; Underground-mining; Electromagnetic-energy; Electromagnetic-fields; Electromagnetic-radiation; Ground-stability; Rock-falls; Rock-mechanics; Accident-prevention; Injury-prevention
Publication Date
20050301
Document Type
Conference/Symposia Proceedings
Editors
Potvin-Y; Hudyma-M
Fiscal Year
2005
NTIS Accession No.
NTIS Price
ISBN No.
9780975675618
NIOSH Division
SRL
Source Name
Controlling Seismic Risk: Sixth International Symposium on Rockburst and Seismicity in Mines, Perth Australia, March 9-11, 2005
State
WA
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