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2014-03-31_REPORT - C1981010 (2)
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2014-03-31_REPORT - C1981010 (2)
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Entry Properties
Last modified
8/24/2016 5:41:31 PM
Creation date
4/1/2014 7:41:56 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
Report
Doc Date
3/31/2014
Doc Name
March 2014 Semi-Annual Geotechnical Monitoring Report
From
Trapper Mining Inc
To
DRMS
Permit Index Doc Type
Stability Report
Email Name
JLE
SB1
Media Type
D
Archive
No
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March 27, 2014 <br />TRAPPER MINING INC. <br />Mr. Jared Ebert <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 PINK ) I [u 14 <br />Dear Mr. Ebert: DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />RE: Semi - annual Geotechnical Monitoring Report — March 2014 <br />Trapper began submitting semi - annual monitoring reports to the Division, beginning March 2008 with the last <br />report completed on September 25, 2013. Trapper has been monitoring the 2006 landslide area for movement <br />through the use of a continuous monitoring system. <br />Section 3.3.3 of Trapper's permit details the initial configuration of the monitoring system. Currently, there are <br />two sites (site 7 and site 8) that are monitoring the area. A map has been attached showing the location of <br />these sites. <br />Displacement graphs for both sites covering the time period of September 26, 2013 through March 27, 2014 are <br />attached. Site 7 shows a small amount of movement and site 8 shows a little more movement. This movement <br />could be caused by the winter freeze /thaw conditions and the mine progressing toward the east, opening up <br />new endwalls and highwalls in the vicinity of these sites. The server that supports the slope monitoring system <br />quit working around October 31, 2013. When it was restarted the displacement data for both sites had spiked. <br />After several days of trying to trouble shoot how to get the data back to the previous values, it was decided to <br />reset the baselines. This is shown in the two GPS graphs as the values went to zero. Trapper is currently in <br />the process of upgrading the system. This upgrade should minimize the problems concerning spiked data and <br />data not going back to the original values after a server reboot or power outage. <br />Inclinometer and piezometer graphs for site 8 have also been attached. The inclinometer located around the R <br />seam changed considerably around October 8, 2013. The data for the seams other than the R seam showed <br />consistent movement since their installations. The movement in the R seam inclinometer, was not as <br />consistent as the other inclinometer movements, and did not show as much movement as planned. There was <br />a parting blast to the R seam on the east side of K strike pit, cut 10 during this time. It is believed this shot <br />caused this inclinometer hole to correct itself and the tension on the R seam inclinometer finally caused the <br />significant movement. The R seam inclinometer shows more movement from January 2014 to the present. <br />This movement is probably caused by opening up the new endwalls and highwalls located near this <br />inclinometer hole. Around November 1, 2013 the piezometer located in the L seam at site 8 quit transmitting <br />data. There was a parting blast to the R seam in L dip pit, cut 1 during this time. It is assumed this shot <br />somehow compromised the piezometer. Data will no longer be available from this piezometer. <br />Please contact me if you have any questions. <br />Sincerely, <br />Tonia Perkins, P. E. <br />Senior Mining Engineer <br />P.O. Box 187 <br />Craig, Colorado 81626 <br />(970) 824 -4401 <br />
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