Results 421 - 430 of 646

• New Developments with the Coal Mine Roof Rating
  8/1/2002 - Conference papers
  The purpose of this paper is to bring the mining community up to date with recent improvements and applications of the CMRR.
• An Examination of the Loyalhanna Limestone's Structural Features and their Impact on Mining and Ground Control Practices
  8/1/2002 - Conference papers
  This paper offers a close look at the complex structural environment of the Loyalhanna Limestone of southwestern Pennsylvania. Analyses were performed using gas well and core logs, outcrop examinations, underground observations, and mine maps.
• Shear Mechanism for Mining-Induced Fractures Applied to Rock Mechanics of Coal Mines
  8/1/2002 - Conference papers
  Two examples of an echelon mining-induced fractures seen in hard-rock mines provided a basis for inferring that fracture zones and bedding plane sap rations immediately surrounding mine openings are promoted by oblique shear into the openings.
• Evaluation of Pillar Recovery in Southern West Virginia
  8/1/2002 - Conference papers
  Studies have identified a number of factors for evaluating a pillar extraction plan. This paper discusses each of the factors, presents relevant accident statistics, and shows how the risk factors can be combined to estimate the overall hazard.
• Field-Scale Void Detection in Coal Piles Using Resistivity Imaging
  7/1/2002 - Conference papers
  This paper summarizes the results obtained from a field-scale test and shows that mapping voids within a coal pile is possible.
• Initial Stability Study of Large Openings for the National Underground Science Laboratory at the Homestake Mine, Lead, SD
  7/1/2002 - Conference papers
  The investigation reported here is an initial study of the stability of the first of the proposed chambers at the Homestake Mine in Lead, SD.
• Mechanics of a Large, Strain-Type Rock Burst and Design for Prevention
  7/1/2002 - Conference papers
  A case study of a rock burst was conducted as part of a project to reduce rock burst hazards being undertaken by the Spokane Research Laboratory (SRL) of the National Institute for Occupational Safety and Health (NIOSH).
• In Mine Evaluation of Discriminating Mine Fire Sensors
  6/1/2002 - Conference papers
  An evaluation of multiple mine fire sensor types for nuisance alarm discrimination. The response of multiple fire sensor types to three small coal fires and three small conveyor belt fires in the presence of diesel emissions was evaluated.
• Feasibility of Using Laser-Based Vibration Measurements to Detect Roof Fall Hazards in Underground Mines
  6/1/2002 - Conference papers
  This paper looks at the feasibility of using noncontact laser-based vibration measurements to detect roof fall hazards with the ultimate vision of improving, expanding and automating procedures for mine roof inspection.
• Evaluating Performance Characteristics of Machine-Mounted Methane Monitors by Measuring Response Time
  6/1/2002 - Conference papers
  This publication examines a procedure for measuring the response time of machine-mounted methane monitors