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Mining Publication: Electromagnetic Noise in Lucky Friday Mine
Keywords: Metal mining Statistical analysis Underground mining
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
Authors: WW Scott, JW Adams, WD Bensema, HH Dobroski
Contract/MOA Report - September 1974
Download PDF Document (4.10 MB)
NIOSHTIC2 Number: 10008119
U.S. Department of the Interior, Bureau of Mines, Contract No. H0133005. NTIS No. Com 75-10258, 1974; :1-129
Measurements of the absolute value of electromagnetic noise and attenuation along a hoist rope were made in an operating Hard-Rock Mine, Lucky Friday Mine, located near Wallace, Idaho. Spectra of electromagnetic noise generated by various pieces of equipment, spectra of specific noise signals at various depths, and noise and attenuation on the 4250 foot (1295 meter) hoist, were measured. Three techniques were used to make the measurements. First, noise was measured over the entire electromagnetic spectrum of interest for brief time periods. Data were recorded using broadband analog magnetic tape for later transformation to spectral plots. Second, noise amplitudes were recorded at several discrete frequencies for a sufficient amount of time to provide data for amplitude probability distributions. A third technique gave attenuation data through the direct measurement of field strength at various depths. The specific measured results are given in a number of spectral plots, amplitude probability distribution plots, and amplitude curves as a function of depth.
Image of publication Electromagnetic Noise in Lucky Friday MineContract/MOA Report - September 1974
Download PDF Document (4.10 MB)
NIOSHTIC2 Number: 10008119
U.S. Department of the Interior, Bureau of Mines, Contract No. H0133005. NTIS No. Com 75-10258, 1974; :1-129
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Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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