Results 61 - 70 of 73

• Rock Mechanics Study of Shaft Stability and Pillar Mining, Homestake Mine, Lead, SD (In Three Parts): 2. Mine Measurements and Confirmation of Premining Results
  5/1/1995 - Reports of Investigations
  A U.S. Bureau of Mines case study of pillar recovery in high-grade ore near the Ross shaft at the Homestake Mine, Lead, SD, has demonstrated the usefulness of the finite-element method for evaluating shaft pillar mining plans and shaft stability. This r...
• 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 ...
• Technology News 443 - Design Practices for Multiple-Seam Room-and-Pillar Mines
  11/1/1994 - Technology News
  Room-and-pillar operators are provided with practical information and guidelines concerning multiple-seam mine design to reduce ground problems associated with the interaction of adjacent workings.
• Technology News 439 - Remote Reset Systems for Continuous Mining Machines Used In Extended Cuts
  8/1/1994 - Technology News
  Information was solicited from various organizations to determine the circumstances that cause power interruptions to extended cut continuous miners. The data accumulated permitted several conclusions to be drawn about why high-voltage circuit breakers ...
• 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.
• In Situ Stress Measurements Near the Ross Shaft Pillar, Homestake Mine, South Dakota
  1/1/1993 - Reports of Investigations
  In situ stresses are important input data for the design of safe, stable stope layouts and extraction sequences. In situ stresses were measured at the Homestake Mine, Lead, SD, using overcoring on hollow inclusion cells and borehole deformation gauges.
• Jet Fan Ventilation in Very Deep Cuts - A Preliminary Analysis
  1/1/1992 - Reports of Investigations
  This report investigates that application of jet fans to ventilate cuts that extend beyond 40 feet. The results of tests involving a jet fan in a 90 foot entry, its benefits and potential problems are discussed.
• Underground Test Results of a Laser-Based Tram Control System for a Continuous Miner
  1/1/1992 - Reports of Investigations
  This report documents the status of a laser-based underground guidance system for tracking and controlling the movements of underground mobile mining equipment.
• Roof Fall Entrapment: Eyewitness Account by Dave Garry
  1/1/1992 - Training materials, Videos and multimedia
  A videotaped interview with a miner helper who witnessed a roof fall that convered the continuous mining machine. An instructor's guide is included to help you use this video as part of an effective training session.