Results 281 - 290 of 348

• Modeling the Effects of Longwall Mining on the Ground Water System
  1/1/1995 - Reports of Investigations
  A hydrologic-subsidence investigation was performed to evaluate the effects of longwall mining on the local groundwater regime through field monitoring and numerical modeling.
• Stability Analysis of a Backfilled Room-and-Pillar Mine
  1/1/1995 - Reports of Investigations
  Displacement and stress changes in cemented backfill and ore pillars at the Buick Mine, near Boss, MO, were monitored by engineers from the U.S. Bureau of Mines and The Doe Run Co., St Louis, MO. Objectives of this research were to evaluate the effect ...
• Detection and Control of Spontaneous Heating in Coal Mine Pillars-A Case Study
  1/1/1995 - Reports of Investigations
  This U.S. Bureau of Mines study examined spontaneous heating episodes in coal mine pillars in an active underground coal mine. The objective of this study was to discover if the location of future events of pillar spontaneous heating could be inferred ...
• A Radar-based Highwall Rib-Thickness Monitoring System
  1/1/1995 - Conference papers
  In addition to developing various types of cool-interface detection systems, the US Bureau of Mines is actively involved in developing a coal rib-thickness monitoring system for highwall mining applications. One particular system to detect the coal-air ...
• Timing and Duration of Subsidence Due to Longwall Mining
  1/1/1995 - Reports of Investigations
  Subsidence data gathered by the U.S. Bureau of Mines over a series of longwall panels in the Pittsburgh Coalbed were studied to obtain insight as to the role of time in the subsidence process. These results were then compared to data from three other si...
• Technology News 436 - Stope Leaching Reduces Surface Environmental Impacts From Underground Mining
  5/1/1994 - Technology News
  The underground stope leaching mining system involves applying leach solutions to mineralized rock that has been fragmented by blasting ore in place, or by backfilling empty stopes.
• Technology News 430 - Translucent Face Partition Reduces Longwall Worker's Dust Exposure
  3/1/1994 - Technology News
  The USBM's current approach to air splitting consists of using a polyester mesh partition to overcome the visibility problems of a solid barrier.
• Pillar Design and Strategies for Retreat Mining
  1/1/1994 - NIOSH/USBM numbered publications
  A computer program called Analysis of Retreat Mining Pillar Stability (ARMPS) is field tested and refined in order to estimate abutment pressures developed during pillaring. It can be successfully employed to predict pillar line stability.
• Longwall Retreat of Gate Road Pillars
  1/1/1993 - Reports of Investigations
  This report investigates the removal of gate road chain pillars in conjunction with longwall retreat mining. The objective was to determine how the pillars, supplemental support, and entries were affected by the longwall abutment pressure.
• Behavior of Simulated Longwall Gob Material
  1/1/1993 - Reports of Investigations
  This report presents results of a U.S. Bureau of Mines study of longwall gob material. The objective of this work was to determine material stiffness properties of the gob for use in numerical models or rock mass response to longwall mining.