Results 101 - 110 of 270

• 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.
• Facility for Melting Residues From Municipal Waste Combustion: Design Criteria and Description of Equipment
  1/1/1993 - Reports of Investigations
  The U.S. Bureau of Mines, under a Memorandum of Agreement with the American Society of Mechanical Engineers (ASME), established design criteria for a facility to melt residues from municipal waste combustion.
• A Method To Eliminate Explosion Hazards in Auger Highwall Mining
  1/1/1993 - Reports of Investigations
  The U.S. Bureau of Mines investigated a method of using inert gas to prevent the formation of explosive gas mixtures in auger highwall mining of coal. A combination of gasoline and diesel engine exhaust gases was introduced into the auger drill hole us...
• 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.
• Evaluation of Catalyzed Diesel Particulate Filters Used in an Underground Metal Mine
  1/1/1993 - Reports of Investigations
  Catalyzed diesel particulate filters (CDPFs) reduce the concentration of diesel particulate matter (DPM) and may reduce the emissions of carbon monoxide (CO) and hydrocarbons (HC) in diesel exhaust.
• Seismicity and Stress Changes Subsequent to Destress Blasting at the Galena Mine and Implications for Stress Control Strategies
  1/1/1993 - Reports of Investigations
  The U.S. Bureau of Mines conducted research at the Galena Mine, Wallace, ID, with the aim of mitigating the effects of rock bursting.
• Transverse-Mounted End-Cab Design for Low-Coal Shuttle Cars
  1/1/1993 - Reports of Investigations
  A prototype end-cab shuttle car (SC) design has been developed to improve protection and address ergonomic concerns of the SC operator in low coal mines. This report discusses research to modify a used 21SC JOY SC, retrofit the SC with the Bureau-devel...
• Vibration Testing of Off-Road Vehicle Seats
  1/1/1993 - Reports of Investigations
  The U.S. Bureau of Mines, in conjunction with Carter Mining Co., conducted vibration tests of four off-road vehicle seats. The purpose of the tests was to determine which seat provided the best vibration attenuation under laboratory conditions.
• Wire Rope Research: Analysis of Bending Fatigue in a 2-Inch IWRC Wire Rope
  1/1/1993 - Reports of Investigations
  A unique machine for inducing bending fatigue in wire ropes was built at the U.S. Bureau of Mine's Pittsburgh Research Center. This report provides an analysis of the results of the first wire rope to be fatigued on this machine.
• Characteristics of Ultrasonic Ranging Sensors in an Underground Environment
  1/1/1993 - Reports of Investigations
  U.S. Bureau of Mines, researchers tested ultrasonic ranging sensors for their ability to define rib line features for computer-aided navigation of underground mine mobile equipment.