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- Research methods and measures:
- Field measurement
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Results 11 - 13 of 13
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8/1/1998 - Conference papersThis paper presents the results of a case study conducted in a two-entry gateroad in a coal mine where excessive roof deformation and bolt loading resulted in failure of many roof supports.
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1/1/1975 - Reports of InvestigationsThe methane content of virgin bituminous coalbed can now be measured accurately in the field with exploration core samples from vertical boreholes. The gas content of the coal per unit weight can be used either to design a mine ventilation system or to ...
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9/1/1974 - Contract reportsMeasurements of surface magnetic field noise were made at various locations over the Geneva Coal Mine near Price, Utah, on June 12, 1973. Results of measurements of distant sferics indicate rather sharp cutoff frequencies below which broadband, impulsiv...
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Content source: National Institute for Occupational Safety and Health, Mining Program