Results 121 - 130 of 200

• Maximizing the Ventilation of Large-Opening Mines
  6/1/2006 - Conference papers
  NIOSH research suggest that by incorporating ventilation planning into the mine planning process, using propeller fans, developing new stopping materials and construction methods, and using long pillars to eliminate crosscuts where possible, the ventila...
• 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.
• Remotely Installed Mine Seals for Mine Fire Control
  3/1/2006 - Conference papers
  NIOSH is conducting full-scale tests at its Lake Lynn Experimental Mine to evaluate/improve remote mine seal construction technology, focusing on technology to completely close the mine opening, & reporting results from use of grout-based materials.
• Performance of a Light-scattering Dust Monitor in Underground Mines
  1/1/2006 - Peer reviewed journal articles
  The Thermo-MIE personal DataRAM dust monitor (pDR) is a light-scattering instrument approved for use in gassy underground mines by the U.S. Mine Safety and Health Administration (MSHA). However, the use of light-scattering monitors has been inhibited by...
• Design in Weak Rock Masses: Nevada Underground Mining Operations
  2/1/2005 - Conference papers
  One focus of ground control research at NIOSH is to incorporate data on weak rock masses into existing design relationships, with an emphasis on updating the span design curve for manned entries and the overbreak curve for longhole entries. Both curves ...
• Detonation Wave Propagation in Underground Mine Entries
  1/1/2005 - Peer reviewed journal articles
  This publication details a series of explosive detonation experiments conducted in NIOSH's Bruceton and Lake Lynn Experimental Mines to evaluate low-level (<6 psig) detonation wave propagation behavior in single- and multiple-entry configurations.
• Origin of Mining-Induced Fractures Through Macroscale Distortion
  6/1/2004 - Conference papers
  NIOSH researchers have identified a pattern of fracture zone development as an explanation for fracture formation around rectangular openings in underground mines. Two computer modeling codes were used to model different aspects of this pattern.
• Effects of Far-Field Shearing Deformation on Fracturing Around an Underground Opening
  5/1/2004 - Conference papers
  Researchers are investigating the causes and mechanisms of roof failure in underground mines with the goal that better understanding these issues will lead to better layout and support designs to help prevent fall-of-ground accidents and fatalities.
• Use of a Test Box to Measure Response Times for Machine-Mounted Monitors
  5/1/2004 - Conference papers
  This study describes how response times of machine-mounted methane monitors were measured by placing the methane sensor heads in a specially designed box where they were exposed to an atmosphere containing a constant concentration of methane.
• 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.