Welcome to CDC stacks | In Situ Stress at the Lucky Friday Mine (In Four Parts) - RI 9560 - 9529 | National Institute for Occupational Safety and Health
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
Clear All Simple Search
Advanced Search
In Situ Stress at the Lucky Friday Mine (In Four Parts) - RI 9560
  • Published Date:
Filetype[PDF-478.54 KB]

  • Description:
    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 unexpected magnitude and orientation [F . 135 MPa (19,600 psi) oriented S 80E1W]. An unusual amount of rock-burst activity was encountered during subsequent excavation. A careful review of the overcore data suggested the overcore strain measurements were valid. Moreover, concentrated rock-burst activity suggested that the measured stress field did exist, but was localized and therefore did not represent the far-field in situ stress field.

  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like: