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Results 61 - 70 of 82
2/1/2002 - Conference papersThis paper examines methods for limiting occupational silica exposures for roof bolting personnel in underground coal mining. It also evaluates a metal rake, a flexible insert, and a rigid insert for cleaning the roof bolter dust collector box.
Reducing Enclosed Cab Drill Operator's Respirable Dust Exposure at Surface Coal Operation With a Retrofitted Filtration and Pressurization System2/1/2002 - Conference papersThis report discusses a cooperative research study performed on a surface drill retrofitted with a new pressurization and filtration system. Respirable dust concentrations were substantially reduced from 0.64 mg/m3 during pre-testing to 0.05 mg/m3 duri...
The Effects of Low Quartz Mass Loading and Spatial Variability on the Quartz Analysis of Surface Coal Mine Dust Samples9/1/2001 - Peer reviewed journal articlesThe objectives of this work are to 1) evaluate the performance of the P7 method on field samples of low quartz mass loadings, 2) evaluate the magnitude of dust mass spatial variability within an enclosed cab environment, and 3) estimate the subsequent p...
7/1/2001 - Peer reviewed journal articlesA number of ignition incidents involving mining and farm equipment have illustrated the surprising danger of drilling, cutting, or otherwise penetrating sealed compartments or frames that are filled with metal scrap for ballast.
Verification and Validation of Roof Bolter Simulation Models for Studying Events Between a Machine and its Operator6/1/2001 - Conference papersThis paper presents the results of a study to verify and validate a computer model that represents and analyzes motions and hazardous events in a simulated three-dimensional workplace. The purpose of the computer model is to support research that is in...
Laboratory Evaluation of a Canopy Air Curtain for Controlling Occupational Exposures of Roof Bolters6/1/2001 - Conference papersTesting at NIOSH assessed the effectiveness of a canopy air curtain for controlling occupational exposures to respirable silica and coal dusts.
8/1/2000 - Conference papersOperator cabs on a front-end loader and a rotary rock drill were retrofitted with ceiling mounted heating/AC units and air filtration systems.
2/1/2000 - Technology NewsA bolter operator must manually place the drill steel and wrench into the drill chunk and then hold onto it as the drill is guided to the hole placement or the wrench is raised to the bolt head. During these actions, the inadvertent actuation of the dri...
Field Assessment of Control Techniques and Long-Term Dust Variability for Surface Coal Mine Rock Drills and Bulldozers9/1/1999 - Peer reviewed journal articlesAirborne respirable dust surveys were conducted at six surface coal mines to investigate the effectiveness of dust control methods used on rotary rock drills and bulldozers.
4/1/1999 - Peer reviewed journal articlesAn evaluation of strategies for monitoring methane levels during roof bolting in an extended cut entry.