Results 451 - 460 of 646

• Sizing of Final Stumps for Safer Pillar Extraction
  8/1/2001 - Conference papers
  The risk of major pillar falls can often be reduced by leaving final stumps, large enough to protect the intersection but small enough to not inhibit gob caving. Analyses were conducted to assess factors on the size variation of remnant stumps.
• The Evolving Mining Workforce: Training Issues
  8/1/2001 - Conference papers
  A major concern in the mining industry today is how to train the present aging workforce plus the expected influx of new and less experienced miners and mine operators as the cohort of older workers retire.
• Failure Characteristics of Roof Falls at an Underground Stone Mine in Southwestern Pennsylvania
  8/1/2001 - Conference papers
  The location and time of 2,007 microseismic emissions from a limestone mine were compared with mine face development and mine layout characteristics. The occurrence of roof failure zones appears to be associated with mine plan characteristics.
• Evaluation of Instrumented Cable and Rebar Bolts as Ground Support at a Trona Mine
  8/1/2001 - Conference papers
  Instrumented cable bolts developed at NIOSH's Spokane Research Laboratory were used in conjunction with existing ground control systems to monitor rock mass loads at Tg Soda Ash's trona mine in Granger, WY.
• Enhanced Surface Control for Roof and Rib Support
  8/1/2001 - Conference papers
  The goal of this project was to design and evaluate devices that can be installed with traditional primary or secondary roof supports, and that are easy to handle/install under temporary or previously supported roof.
• Load and Deflection Response of Ventilation Stoppings to Longwall Abutment Loading: A Case Study
  8/1/2001 - Conference papers
  This paper presents investigations of underground measurements conducted to determine the loading response of stoppings constructed from lightweight aggregate concrete masonry units.
• Updating the NIOSH Support Technology Optimization Program (STOP) With New Support Technologies and Additional Design Features
  8/1/2001 - Conference papers
  The Support Technology Optimization Program (STOP) was updated to Version 2.3. This paper describes the additional features: including uncontrolled convergence into the design requirements for standing roof supports; the addition of design procedures fo...
• Effects of Bolt Spacing, Bolt Length, and Roof Span on Bolt Loading in a Trona Mine
  8/1/2001 - Conference papers
  NIOSH researchers installed 39 instrumented, fully grouted bolts at six test sites in a trona mine retreat panel to study mine roof stability for the improvement of workplace safety.
• Field Evaluation of Mobile Roof Support Technologies
  8/1/2001 - Conference papers
  A historic overview of the role of mobile roof support (MRS) technologies in improving stability and worker safety is presented along with field evaluations of the MRS load rate monitoring device and other remote deformation-monitoring techniques.
• An Analysis of Rock Failure Around a Deep Longwall Using Microseismics
  8/1/2001 - Conference papers
  A state-of-the-art, three-dimensional, full waveform, microseismic system was used to analyze the rock failure around a deep bump-prone longwall panel. Analysis of the recorded events is discussed.