Results 31 - 40 of 79

• 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...
• Differential Wall Rock Movements Associated with Rock Bursts, Lucky Friday Mine, Coeur d'Alene Mining District, Idaho, USA
  6/1/1999 - Conference papers
  Various methods of monitoring slip movements on bedding planes, as well as examination of rock burst damage in stopes, suggests that rock bursts in the Lucky Friday Miner are closely associated with these movements.
• Coal Mine Subsidence Prediction Using a Boundary-Element Program
  3/1/1999 - Conference papers
  This paper presents several case studies in which a mechanics-based boundary-element program is used to back-calculate the surface subsidence associated with various panels at several northern Appalachian coal mines.
• Comparison of Seismic Tomography, Strain Relief, and Ultrasonic Velocity Measurements to Evaluate Stress in an Underground Pillar
  3/1/1999 - Conference papers
  An investigation of an underground pillar at a mine in Lead, SD. Using the results, researchers hypothesize that pillar rocks have the ability to withstand stress an order of magnitude greater than they currently sustain.
• Role of Fault Slip on Mechanisms of Rock Burst Damage, Lucky Friday Mine, Idaho, USA
  1/1/1999 - Conference papers
  Various methods of monitoring slip movements on bedding planes, as well as examination of rock burst damage in stopes, suggest that many rock bursts in the Lucky Friday Mine are closely associated with these movements.
• 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...
• Measuring the Gas Content of Coal: A Review
  2/1/1998 - Peer reviewed journal articles
  Coalbed gas content measurements are commonly used in mine safety as well as coalbed methane resource assessment and recovery applications. Gas content determination techniques generally fall into two categories: (1) direct methods which actually measu...
• 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.
• Technology News 466 - Use of Seismic Tomography to Identify Geologic Hazards in Underground Mines
  11/1/1997 - Technology News
  The use of seismic tomography to identify geologic hazards in underground mines is discussed.
• Analysis and Prediction of Longwall Methane Emissions: A Case Study in the Pocahontas No. 3 Coalbed, VA
  2/1/1997 - Conference papers
  Increasing longwall panel dimensions, particularly face width in gassy coalbeds, may result in unexpected increases in methane emissions. To investigate this problem, continuous longwall face emission monitoring studies were conducted at two adjacent mi...