Results 71 - 80 of 99

• Reducing Worker Exposure To Dust Generated During Longwall Mining
  1/1/2001 - Conference papers
  Longwall mining equipment has improved dramatically over the last 15 years. Although significant gains in longwall dust control have been made, they have been challenged by significant increases in coal extraction rates resulting in more dust being gene...
• Implications of Recent NIOSH Tracer Gas Studies on Bleeder and Gob Gas Ventilation Design
  2/1/2000 - Conference papers
  A paper describing research at a Pittsburgh Coalbed longwall mine to evaluate and optimize bleeder ventilation and gob gas venthole longwall methane control systems.
• 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...
• Characterization of Gas Flow in Longwall Gobs: Pittsburgh Coalbed, PA
  5/1/1999 - Conference papers
  Investigation of the geologic and mining factors influencing the migration of longwall gob gas with a goal to optimize methane drainage strategies to reduce the volume of gob gas that reaches the underground workplace.
• 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 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...
• Subsidence Prediction Using a Laminated, Boundary-Element Program
  6/1/1998 - Conference papers
  Historically, the surface subsidence over underground coal mines has been predicted using empirical profile or influence functions which have little or no connection to the actual mechanics of the subsidence. This paper presents a case study where a me...
• International Experience with Longwall Mining into Pre-Driven Rooms
  1/1/1998 - Conference papers
  Unusual circumstances sometimes require a longwall retreat into/through a previously driven room, with the potential for failures and roof fall hazards. To determine the failure factors, NIOSH compiled an international database of 130 case histories.
• Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
  11/1/1997 - Technology News
  A method is described for allowing operators to predict methane emissions from panels with increased face width.
• Status of Dust Control Technology on U.S. Longwalls
  2/1/1997 - Conference papers
  NIOSH conducted dust surveys at 13 longwalls operating throughout the U.S. and collected information to: identify current operating practices on these longwalls, identify the types of dust controls in use, etc.