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Results 41 - 50 of 73
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The Effects of Water Spray Placement for Controlling Respirable Dust and Face Methane Concentrations4/1/2006 - Peer reviewed journal articlesA series of laboratory evaluations examined the impact of water spray pressure, curtain setback distance, and external and underboom spray use for controlling respirable dust levels and sulfur hexafluoride tracer gas concentrations around a continuous m...
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8/1/2005 - Conference papersResults show that the remnant upper seam structure's size can influence multiple seam interaction. Specifically, smaller critically loaded upper seam pillars appear more likely to cause lower seam ground control problems than wider pillars.
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1/1/2005 - Conference papersIn some underground limestone mines, the dip may exceed 5°. This can cause roof instability, which can be exacerbated by horizontal tectonic stresses. Field studies and numerical model analyses assess the effect of dip in various stress conditions.
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12/1/2004 - Peer reviewed journal articlesA laboratory study assessed the impacts of water spray pressure, face ventilation quantity, and line brattice setback distance on respirable dust and SF6 tracer gas concentrations around a continuous mining machine using a sprayfan or directional spray ...
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8/1/2004 - Conference papersPolyurethane injection is a proven method of rock stabilization in even the weakest, most broken ground. Optimization of the injection design by pre-injection video diagnostics can greatly contribute to successful and efficient roof stabilization.
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2/1/2004 - Conference papersDescribes three alternative ventilation models for use in large opening underground mines with respect to their use in mines of various levels of development.
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8/1/2002 - Conference papersA study is described with the objective of evaluating the various methods and strategies by which panels, production pillars and barrier pillars are developed and extracted under deep cover, and to develop appropriate design guidelines.
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8/1/2002 - Conference papersStudies have identified a number of factors for evaluating a pillar extraction plan. This paper discusses each of the factors, presents relevant accident statistics, and shows how the risk factors can be combined to estimate the overall hazard.
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8/1/2001 - Conference papersThe risk of major pillar falls can often be reduced by leaving final stumps, large enough to protect the intersection but small enough to not inhibit gob caving. Analyses were conducted to assess factors on the size variation of remnant stumps.
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8/1/2001 - Conference papersNIOSH researchers installed 39 instrumented, fully grouted bolts at six test sites in a trona mine retreat panel to study mine roof stability for the improvement of workplace safety.
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Content source: National Institute for Occupational Safety and Health, Mining Program