Electromagnetic Location System Experiments in a Deep Hardrock Mine.
NTIS: PB/232-880 Available for Reference At Bureau Libraries :54 pages
The report (Contract No. H0242006) gives the results of experiments in a northwest Idaho mine evaluating the performance of an electromagnetic system for detecting and locating trapped miners. The results show that lightweight portable transmitters can be effectively used to provide uplink communications and location information in deep hardrock mines. Tests were performed in the Galena Mine using long wire transmitting antennas as well as horizontal and vertical transmitting loops at depths from 3,000 feet to 4,300 feet. Surface measurements were made of magnetic field strengths, field strength patterns, and background noise. These measurements were compared with theoretical predictions for a homogeneous ground conductivity consistent with the geologic region. Results also show that horizontal wire configuration can serve as an effective alternative to the magnetic dipole antenna in rescue work.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/232-880; Available for Reference At Bureau Libraries
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