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Mining Publication: In Situ Stress at the Lucky Friday Mine (In Four Parts): 2. Analysis of Overcore Measurement From 5300 Level

July 1995

Image of publication In Situ Stress at the Lucky Friday Mine (In Four Parts): 2. Analysis of Overcore Measurement From 5300 Level

The U.S. Bureau of Mines conducted an overcore stress measurement on the 5300 level of the Lucky Friday Mine, Mullan, Idaho, 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 [maximum principal stress equals approx. 135 MPa (19,600 psi) oriented S 80 deg W]. 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.

Authors: JK Whyatt, FM Jenkins, MK Larson

Report of InvestigationsJuly - 1995

  • Adobe Acrobat - Portable Document Format (.PDF)

    0.53 MB

NIOSHTIC2 Number: 20024016

U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9560. NTIS stock number: PB95-251880, 1995 Jul :1-42

 
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