Laserfiche WebLink
INTERNAL MEMORANDUM <br />Date: April 7, 2014 <br />To: Jared L. Ebert, Lead Specialist <br />From: Marcia L. Talvitie, P.E. J <br />Subject: Trapper Mine (Permit No. C- 1981.010) <br />Review of March 2014 Semi - Annual Geotechnical Monitoring Report <br />At your request, I have reviewed the Semi - Annual Geotechnical Monitoring Report (GMR) from <br />Trapper Mining, Inc., dated March 27, 2014. The report covers the period of time between <br />September 27, 2013 and March 27, 2014. <br />Geotechnical monitoring for the East Panel Landslide is addressed in Section 3.3.3 of the Permit, <br />which is being updated under the pending Permit Revision No. 7. <br />The number of GPS stations (recording X -Y -Z coordinates) remains at two — Sites 7 and 8. The <br />last remaining piezometer, at Site 8, ceased to operate in November 2013. Data continued to be <br />collected from inclinometers installed at three levels at Site 8. <br />The continuous monitoring program was developed as part of a new ground control plan <br />submitted to MSHA and was implemented in 2009. I phoned Tonia Perkins, P.E., of TMI today <br />to inquire about the status of the monitoring program and TMI's obligations to MSHA. Ms. <br />Perkins indicated that since mining within the Landslide area is virtually complete, the company <br />plans to approach MSHA regarding revising the ground control plan. She anticipates that this <br />will occur within the next six months. TMI may then re -drill and reinstall Site 8, and relocate the <br />equipment from Site 7 to a different spot. Monitoring would potentially be continued for TMI's <br />own use, rather than as a requirement of MSHA. <br />I have no comments regarding the data reported in the subject report. The quantity and quality is <br />less than what existed previously, but the need for continued monitoring may be reaching an end. <br />It would be helpful in the next semi- annual report for TMI to include any updated information <br />regarding MSHA's requirements and any changes to the ground control plan that are anticipated <br />or have occurred. Section 3.3.3 of the permit should be updated as appropriate. <br />Please feel free to contact me with any additional questions you may have. <br />cc: Sandy Brown, DRMS <br />