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Mining Publication: Electromagnetic Noise in Grace Mine

NOTE: This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.

Original creation date: September 1974

Image of publication Electromagnetic Noise in Grace Mine

Two different techniques were used to make measurements of the absolute value of electromagnetic noise in an operating hardrock mine, Grace Mine, located near Morgantown, Pennsylvania. Diesel-powered haulage equipment is used in this mine, and the electromagnetic noise environment it creates was measured to see how it differs from the environment created by electric-powered haulage equipment. One technique measures noise over the entire electromagnetic spectrum of interest for brief time periods. It is recorded using broadband analog magnetic tape, and the noise data is later transformed to give spectral plots. The other technique records noise amplitudes at several discrete frequencies for a sufficient amount of time to provide amplitude probability distributions. The specific measured results are given in a number of spectral plots and amplitude probability distribution plots.

Authors: JW Adams, WD Bensema, M Kanda

Contract/MOA Report - September 1974

NIOSHTIC2 Number: 10001384

U.S. Department of the Interior, Bureau of Mines, Contract No. H0133005. NTIS No. Com/741-1687, 1974; :1-127