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Results 1 - 10 of 50
8/1/2009 - Conference papersThis paper describes network installation and methods used to collect, process, and distribute seismicity information collected on the surface above two longwall coal mines in western Colorado, and gives several examples of the collected data.
This paper describes a seismic network installed in western Colorado in the vicinity of three underground coal mines, its features for user access to data, and then gives two examples of seismic events resulting in some damage to mine workings.
2/1/2002 - Conference papersA deep longwall coal mine was instrumented with a 3-D microseismic system to help determine the exact strata mechanics associated with rock failure, redistribution of stress and associated gob formation from the longwall.
7/1/2001 - Conference papersOutlines the concepts used to correlate rock failure with microseismic events and presents examples of microseismic monitoring together with associated computer modeling of the rock failure from several mine sites.
6/1/2010 - Conference papersIn this paper instrumentation and sampling strategies for accurate monitoring of airflow in an entry using two-axis and three-axis ultrasonic anemometers are evaluated.
6/1/2010 - Conference papersNIOSH has developed a portable elemental carbon monitoring device for use in underground mines. This paper discusses a variety of ways that this instrument has been used to help lower DPM concentrations and exposure to DPM in active mines.
11/1/2009 - Conference papersThe paper discusses how the Diesel Particulate Matter (DPM) monitors have performed within the underground mine environment in evaluating DPM during the various phases of longwall moves.
Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall MineThe objective was to determine whether a qualitative but coherent redistribution of velocity, indicating change in location of induced stress, could be imaged as mining occurred in known locations by using a local earthquake tomography software.
This paper will review current and historic work practices used internationally to minimize the hazard to miners from mining in conditions which could produce a bump.
This paper describes a case study where a surface-based microseismic system, using triaxial geophones in boreholes drilled from the surface, was deployed at a large limestone mine.