Monitoring the In Situ Performance of Cemented Paste Backfill at the Lucky Friday Mine

Details

• Personal Author:
  Abraham H ; Johnson JC ; Raffaldi MJ ; Seymour, Joseph B. ; Zahl, Eric G.
• Description:
  In cooperation with the Hecla Mining Company, NIOSH researchers have developed effective methods for monitoring the in situ performance of cemented paste backfill during underhand cut-and-fill mining more than 1,950 m (6,400 ft) beneath the ground surface. Robust and reliable instruments were installed at eight locations in two production stopes prior to backfilling, and monitored over a two-year period through five undercut advances. Horizontal pressures up to 5.50 MPa (798 psi) were measured in the paste fill along with 51 cm (20 in) of stope closure. From the instrument data, the in situ stress versus strain behavior of the paste fill was analyzed, providing an average in situ modulus of deformation of about 3.62 GPa (525 ksi) for the backfill during initial undercut mining. The initial elastic response of the paste fill was typically followed by strain softening and plastic deformation with additional closure. The onset of strain hardening behavior in the paste fill was measured during mining of a fifth undercut advance. The instruments are currently being monitored every two hours by data acquisition systems that are linked through the mine's communications systems to a corporate web site - thus providing the mine staff and NIOSH researchers with reliable, timely information about the backfill's behavior and stability. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Analytical Instruments Analytical Processes Cements Communication Systems Data Processing Elastic Properties Ground Monitoring Ground Stability In Situ Mining Mining-industry Monitoring Systems Monitors Pressure Testing Rock-mechanics Stope Mining Stress Analysis Structural Analysis Underground-mining

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• Series:
  Mining Publications
• ISBN:
  9781510835818
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 10 ; OSHA Region 8 ; Utah ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SMRD - Spokane Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  13-26
• NIOSHTIC Number:
  nn:20049577
• Citation:
  Minefill 2017: Proceedings of the 12th International Symposium on Mining with Backfill, February 19-22, 2017, Denver, Colorado. Stone D, ed. Englewood, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2017 Feb; :13-26
• Contact Point Address:
  J.B. Seymour, National Institute for Occupational Safety and Health, Spokane Mining Research Division, Spokane, Washington, USA
• Editor(s):
  Stone D
• Federal Fiscal Year:
  2017
• Peer Reviewed:
  False
• Source Full Name:
  Minefill 2017: Proceedings of the 12th International Symposium on Mining with Backfill, February 19-22, 2017, Denver, Colorado
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:eb9af33701a48d13c484b91940f9180d29f6574d140af442a08783da0626c5157ab0b89b132e2fc9c7200b5829b51b0df2711f76242b3000d60a6f7127311eea
• Download URL:
  https://stacks.cdc.gov/view/cdc/228410/cdc_228410_DS1.pdf
• File Type:
  [PDF - 1.60 MB ]