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Research on the transmission of electromagnetic signals between mine workings and the surface.

Authors
Geyer-RG; Keller-GV; Ohya-T
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, OFR 61-74, :1-124
NIOSHTIC No.
10001486
Abstract
Field studies (Contract No. H0101691) of ambient electromagnetic noise and electrical transmission properties of coal mine overburdens in Colorado, Illinois, Pennsylvania, and West Virginia were conducted. Field tests of the transmission of low-frequency (20 hz to 20,000 hz) signals by vertical axis loops and horizontal wire antenna were made and compared with theoretical predictions. Implications of the field tests for the design of an electromagnetic system to locate trapped miners are discussed.
Keywords
Mine-gases; Mining-industry; Methanes; Methane-drainage; Methane-control; Explosive-gases; Explosive-atmospheres; Underground-mining; Coal-mining; Control-technology; Engineering-controls
CAS No.
74-82-8
Publication Date
19740101
Document Type
CP; Final Contract Report
Fiscal Year
1974
NTIS Accession No.
PB-237852
NTIS Price
A07
Identifying No.
OFR-61-74
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, OFR 61-74
State
CO; IL; PA; WV
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