Results 1 - 7 of 7

• Evaluation of Face Dust Concentrations at Mines Using Deep-Cutting Practices
  1/1/2011 - Reports of Investigations
  Dust surveys determined if deep-cut mining expose face workers to higher levels of respirable dust. Study findings indicate that levels on bolting faces did not appear to be affected by longer cycles associated with deep-cut mining practices.
• Guidelines for the Control and Monitoring of Methane Gas on Continuous Mining Operations
  4/1/2010 - Reports of Investigations, Safety guidelines, tips, and checklists
  This NIOSH publication demonstrates how existing and new engineering controls can be used to reduce face methane levels.
• Jet Fan Ventilation in Very Deep Cuts - A Preliminary Analysis
  1/1/1992 - Reports of Investigations
  This report investigates that application of jet fans to ventilate cuts that extend beyond 40 feet. The results of tests involving a jet fan in a 90 foot entry, its benefits and potential problems are discussed.
• Simulation of Methane Flows in Noncoal Mines
  1/1/1984 - Reports of Investigations
  The Bureau of Mines has successfully tested a method to simulate methane (CH4) flows from face areas through the returns of noncoal mines. This technique involves releasing a small quantity of tracer gas at a working area and sampling for that gas downs...
• Face Ventilation Measurement with Sulfur Hexafluoride (SF6)
  1/1/1980 - Reports of Investigations
  The face ventilation measurement method developed by the Bureau of Mines involves releasing a small volume of tracer gas (SF6) on the off-curtain side of the working face at the start of the mining cycle.
• Water Infusion of Coalbeds for Methane and Dust Control
  1/1/1977 - Reports of Investigations
  This Bureau of Mines report deals with water infusion of coalbeds, which can control methane emission at face areas during developmental mining and which may sometimes suppress dust. Studies show that water infused into the coalbed flows through the fra...
• Use of Surface Joint and Photolinear Data for Predicting Subsurface Coal Cleat Orientation
  1/1/1976 - Reports of Investigations
  Coalbeds exhibit a directional permeability, with the maximum permeability oriented parallel to the face cleat. Thus, the most efficient pattern of vertical degasification holes for a coalbed is dependent upon cleat orientation. Analysis of surface joi...