Mining the Remaining Portion of the Ross Shaft Pillar

Details

• Personal Author:
  Brady, Thomas M. ; Johnson JC ; Laurenti MA ; Pariseau, W. G. ; Stahl S
• Description:
  Past finite element analysis of pillar mining effects on the Ross Shaft at the Homestake Mine in Lead, South Dakota, indicated stability of the shaft during mining on both sides of a central pillar that was defined within a much larger original shaft pillar. Experience with pillar mining that began in 1988 verified the earlier forecast of stability. Mining of the remaining central portion of the original pillar began in early 1995. A "cave" occurred in 1996 that led to a temporary cessation of pillar mining; pillar mining began anew in 1997 and continued for a short period. A relatively small portion of the central pillar remains. Previous pillar mining on north and south sides of the central pillar and mining between the central pillar and the Ross Shaft as well as top and bottom sill development have isolated the ore remaining. Thus, one intuitively expects little effect of final mining on the Ross Shaft. Results of the present study confirm this expectation and show very little change in shaft stability as a consequence of mining the ore remaining in the central portion of the original shaft pillar. Comparisons of three-dimensional finite element model displacements with borehole extensometer measurements that began in June, 1944, reinforce this conclusion. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety Safety Management
• Keywords:
  Miners Mine Shafts Mine Workers Mining Industry Models Room And Pillar Mining Safety Monitoring
• Series:
  Mining Publications
• ISBN:
  9789026518270
• Publisher:
  A. A. Balkema
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  District of Columbia ; OSHA Region 10 ; OSHA Region 3 ; OSHA Region 8 ; South Dakota ; Utah ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SRL - Spokane Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  395-399
• Volume:
  1
• NIOSHTIC Number:
  nn:20021266
• Citation:
  Rock mechanics in the national interest: proceedings of the 38th U.S. Rock Mechanics Symposium, DC Rocks 2001, July 7-10, 2001, Washington, D. C. Elsworth D, Tinucci JP, Heasley KA, eds. Vol. I, Lisse, Netherlands: A. A. Balkema, 2001 Jul; 1:395-399
• Editor(s):
  Elsworth D; Tinucci JP; Heasley KA
• Federal Fiscal Year:
  2001
• Peer Reviewed:
  False
• Source Full Name:
  Rock mechanics in the national interest: proceedings of the 38th U.S. Rock Mechanics Symposium, DC Rocks 2001, July 7-10, 2001, Washington, D. C.
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3264fde1726eaadda45d6b1d6b876371e44142195a604ce5e144d9c92313500407e7bb8b8c2b8f0f3b68c9a39a96bb9a226cf6dbf7708b5c40307b7842b2f040
• Download URL:
  https://stacks.cdc.gov/view/cdc/220445/cdc_220445_DS1.pdf
• File Type:
  [PDF - 417.13 KB ]