Results 31 - 40 of 48

• Technology News 520 - A Method to Characterize Risk Associated With Mine Roof Conditions
  10/1/2006 - Technology News
  Describes the Roof Fall Risk Index (RFRI), a method of systematically characterizing the risk of roof falls in underground limestone mines.
• Limestone Mining: Is It Noisy or Not?
  10/1/2006 - Peer reviewed journal articles
  This article describes noise research conducted in limestone mines, detailing the equipment likely to cause worker overexposures, the occupations experiencing overexposures, and the implications for worker noise exposure reduction.
• Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
  8/1/2006 - Conference papers
  A survey of pillar conditions was carried out at 21 operating limestone mines that use the room-and-pillar method. Pillar instability is most likely caused by unfavorable geological structures in pillars with width to height ratios of less than 1.5.
• Field Verification of the Roof Fall Risk Index: a Method to Assess Strata Conditions
  8/1/2006 - Conference papers
  The Roof Fall Risk Index helps the underground stone mine operator to assess defects of the mine strata and rate the relative roof fall risk these defects pose. This paper shows how the defect information is collected and methods to analyze the data.
• The Effects of Water Emulsified Fuel on Diesel Particulate Matter Concentrations in Underground Mines
  6/1/2006 - Conference papers
  The ambient diesel particulate matter (DPM) concentrations (at the intakes and exhausts of the mine) was evaluated as an entire vehicle fleet of a stone mine switched from using 35% biodiesel to a water-emulsified fuel (PuriNOx).
• Assessing Roof Fall Hazards for Underground Stone Mines: A Proposed Methodology
  3/27/2006 - Conference papers
  A methodology to assess the risk for a roof fall is proposed in a preliminary fashion based on engineering judgment acquired from extensive underground stone mine experience and examination of related literature.
• Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
  1/1/2005 - Conference papers
  In some underground limestone mines, the dip may exceed 5°. This can cause roof instability, which can be exacerbated by horizontal tectonic stresses. Field studies and numerical model analyses assess the effect of dip in various stress conditions.
• Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
  8/1/2004 - Conference papers
  Underground limestone mine roofs in Northern Appalachia can be subject to high horizontal stresses. A case study is presented showing that induced stress changes in the immediate roof are less likely if the pillars contain weak bedding planes.
• A Computer Software Program that Estimates Air Quantity Requirements in Large Opening Stone Mines
  5/1/2004 - Conference papers
  Describes a computer program developed by NIOSH for estimating the air quantity needed to dilute diesel particulate matter in underground large opening mines.
• Workplace Solutions: Ground Fall Injuries in Underground Stone Mines
  11/1/2003 - NIOSH/USBM numbered publications
  Workers in underground stone mines have a high fatality rate caused by falls of ground from the mine roof or rib. Related NIOSH recommendations address baskets, scalers, bolters, drill steel changing, personal protective equipment, and training.