Results 1 - 5 of 5

• Geophysical Methods to Detect Stress in Underground Mines
  3/1/2004 - Reports of Investigations
  Highly stressed rock in stopes continues to be a primary safety risk for miners in underground mines because this condition can result in failures of ground that lead to both injuries and death.
• Geomechanics of Reinforced Cemented Backfill in an Underhand Stope at the Lucky Friday Mine, Mullan, Idaho
  7/1/2001 - Reports of Investigations
  Because backfill has occasionally collapsed into an active working area, posing a hazard to miners, engineers installed instruments in a cemented, backfilled, stope-ramp intersection at Hecla's Lucky Friday Mine.
• In Situ Stress at the Lucky Friday Mine (In Four Parts): 3. Reanalysis of Overcore Measurements from the Star Mine
  7/1/1995 - Reports of Investigations
  U.S. Bureau of Mines researchers reviewed an in situ stress estimate developed from measurements of overcore strain taken at test sites on the 7300 and 7500 levels of the Star Mine near Mullan, ID. Although the field measurements of overcoring strain we...
• In Situ Stress at the Lucky Friday Mine (In Four Parts): 4. Characterization of Mine In Situ Stress Field
  7/1/1995 - Reports of Investigations
  Researchers at the U.S. Bureau of Mines collected and analyzed overcore measurements and other indicators of in situ stress characteristics at the Lucky Friday Mine, Mullan, ID. An analysis of these data revealed that significant local variations in in ...
• In Situ Stress at the Lucky Friday Mine (In Four Parts): 2. Analysis of Overcore Measurement From 5300 Level
  7/1/1995 - Reports of Investigations
  The U.S. Bureau of Mines conducted an overcore stress measurement on the 5300 level of the Lucky Friday Mine, Mullan, ID, to investigate the stress regime around an experimental stope in a rock-burst-prone mine. The result indicated a stress field with ...