Results 91 - 97 of 97

• 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.
• A Catastrophe-Theory Model for Simulating Behavioral Accidents
  11/1/1988 - Information Circulars
  Based on a comprehensive data base of mining accidents, a computerized catastrophe model has been developed by the Bureau of Mines which systematically links individual psychological, group behavioral, and mine environmental variables with other acciden...
• Above-the-Earth Field Contours for a Dipole Buried in a Homogeneous Half-Space
  1/1/1983 - Reports of Investigations
  An essential element of the USBM electromagnetic location and communication system for trapped miners is knowledge of the surface and above-surface electromagnetic fields created by an underground transmitter.
• Electromagnetic Surface Fields Due to a Magnetic Dipole Buried in a Three-Layered Earth
  10/1/1982 - Reports of Investigations
  The Bureau of Mines electromagnetic trapped miner location and communications system requires a thorough understanding of TTE electromagnetic wave propagation.
• Propagation of UHF Radio Waves in Limestone Room and Pillar Mines
  1/1/1979 - Contract reports
  This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is ...
• Evaluation of Mine Illumination Systems Using Numerical Modeling
  10/1/1978 - Conference papers
  The analysis of a machine-luminaire configuration is well suited to computer analysis; the incident light levels can be calculated at the required set of points. This paper presents a description of the techniques involved in this simulation.
• Methane Diffusion Parameters for Sized Coal Particles: A Measuring Apparatus and Some Preliminary Results
  1/1/1972 - Reports of Investigations
  A sorption apparatus for measuring the equilibrium sorption isotherm and the rate of diffusion of methane from fine-sized coal was designed and constructed. Preliminary work that used Pittsburgh and Pocahontas No. 3 Coal shows that the diffusion coeffic...