2011-04-29_REPORT - C1981010

• Permit No: C1981010
• IBM Index Class Name: Report
• Doc Date: 4/29/2011
• Doc Name: Review of March 2011 Geotechnical Monitoring Report ‎(Memo)‎
• From: Marcia Talvitie
• To: Rob Zuber
• Permit Index Doc Type: Subsidence Report
• Email Name: RDZ
• Email Name: MLT
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
Date: 29 April 2011
To: Rob Zuber, P.E.
From: Marcia L. Talvitie, P.E. I ?
Subject: Trapper Mine — Permit No. C-1981-010
Review of March 2011 Geotechnical Monitoring Report
MINING
SAFETY
At your request, I have reviewed the Semi-annual Geotechnical Monitoring Report
(GMR) from Trapper Mining Inc. dated March 31, 2011. This report covers the period of
time between October 1, 2010 and March 31, 2011.
Continuous inclinometer and piezometer results are reported for Stations 2, 3, 4 and 5;
GPS data is provided for Stations 2, 3 and 4. Station 3 was removed after March 8, and
construction of a new Station 6 is proposed for the summer of 2011.
For the upcoming Fall, 2011 GMR, please request that Trapper provide the depths, in
feet beneath the surface, of the inclinometer and piezometer sensor installations for
Stations 5 and 6.
This concludes my review of the March 2011 Geotechnical Monitoring Report for the
Trapper Mine. Please feel free to contact me with any questions that may arise.
Office of Office of
Mined Land Reclamation Denver • Grand junction • Durango Active and Inactive Mines