Results 191 - 200 of 282

• Prediction of Longwall Methane Emissions: An Evaluation of the Influence of Mining Practices on Gas Emissions and Methane Control Systems
  10/1/1999 - Reports of Investigations
  An analysis of the consequences of increasing longwall panel dimensions, particularly face width, in gassy coalbeds. Continuous longwall face emission monitoring studies were conducted at two adjacent mines operating in the Pocahontas No. 3 Coalbed, whe...
• The State-of-the-Art in Coal Pillar Design
  3/1/1999 - Conference papers
  Recently, powerful design methods have emerged from analysis of large data bases of real-world pillar successes and failures. In the process, our understanding of pillar mechanics has been greatly enriched.
• A Hybrid Statistical-Analytical Method for assessing Violent Failure in U.S. Coal Mines
  1/1/1999 - Information Circulars
  This work identified the most important variables contributing to coal bumps. These are (1) mechanical properties of strata, including local yield characteristics of a mine roof and floor, (2) gate pillar factors of safety, (3) roof beam thickness, join...
• Work Sampling Applied to a Human Factors Analysis of Mine Worker Positioning
  10/1/1998 - Conference papers
  Growing concern from labor unions, regulatory agencies, and industry about the safety of a prevalent underground coal mining method which utilizes remote control has prompted human factors field evaluation of mining activities. To determine work methods...
• Concluding Evaluation of a Continuous Haulage Guidance Sensor
  10/1/1998 - Reports of Investigations
  One of the applications of enabling technology for remote-controlled mining to protect miners is the use of a guidance system on the continuous haulage equipment so that it follows the continuous mining machine that extracts the coal.
• Comparison of Ground Conditions and Ground Control Practices in the United States and Australia
  8/1/1998 - Conference papers
  Ground conditions at 10 Australian longwall mines and two room-and-pillar mines are compared with an extensive database from U.S. mines. Comparisons include the Coal Mine Roof Rating, roof support, pillar design, and ground control conditions.
• Factors Influencing Intersection Stability in U.S. Coal Mines
  8/1/1998 - Conference papers
  Based on field investigations and a U.S. coal mines database containing 12 mines and 639 roof falls, NIOSH determines the factors that influence intersection instability and provides guidelines for the safe excavation and support of intersections.
• A Comparison of Longwall & Continuous Mining Safety in U.S. Coal Mines 1988-1997
  6/1/1998 - Conference papers
  This paper contains the results of an examination of accident, injury, employment, and production information reported to the U.S. Department of Labor's Mines Safety and Health Administration (MSHA) and provides information on some of the measures longw...
• Technology News 464 - Analysis of Retreat Mining Pillar Stability (ARMPS): Version 4.0 for Windows
  7/1/1997 - Technology News
  The analysis of Retreat Mining Pillar Stability (ARMPS) computer program was developed in 1995 and has been widely accepted by the mining community. A Windows version of ARMPS is now available. It features simplified data input, graphics, and an expande...
• Technology News 462 - Ground Penetrating Radar for Highwall Guidance
  7/1/1997 - Technology News
  To provide a safe, practical, cost-effective method for measuring coal rib thickness during highwall mining.