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Resistivity Roof Fall Warning System in the White Pine Mine.

Authors
Gibbons-M; Farstad-AJ; Kehrman-RF
Source
NTIS: PB/80-186547 :75 pages
Link
NIOSHTIC No.
10002058
Abstract
A method of monitoring roof stability in underground mines by detecting the changes in resistivity of roof material was tested. The device was tested over a 16-month period at the White Pine Copper Mine in Michigan. Three falls of ground were monitored by as many as 11 sensors. Data indicate a correlation between changes in resistivity and impending structural failure. Problems were encountered with the high roof electrode impedance in the winter and spring due to the drying out of the roof material. Difficulties also developed in obtaining a permanent bond between the roof rock, the conductive epoxy, and the electrode plate. Some data were lost due to timer and fuse problems within the unit, but these were eventually rectified.
Publication Date
19790101
Document Type
CP; Final Contract Report;
Fiscal Year
1979
NTIS Accession No.
PB80-186547
NTIS Price
A05
Identifying No.
OFR 53-80
NIOSH Division
DRC;
Source Name
NTIS: PB/80-186547
State
MI;
Performing Organization
Westinghouse Electric Corp.
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