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PERMFILE103730
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Entry Properties
Last modified
8/24/2016 9:57:11 PM
Creation date
11/24/2007 10:21:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Revision
Doc Date
12/2/2004
Doc Name
2.05.5 Post-Mining Land Uses
Type & Sequence
PR10
Media Type
D
Archive
No
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West Elk Mine <br />noticeably affected by subsidence and seismic activity produced by longwall mining beneath, or <br />neaz, landslide areas. <br />Both the landslides on Jumbo Mountain and those north and south of Minnesota Reservoir occur <br />in surficial material (loose rock, gravel, sand, silt, clay, and soil) and local bedrock outcrops. <br />The author therefore expects that the mining of longwall panel E9 will not noticeably affect the <br />large landslide south of Minnesota Reservoir. <br />Mining of the nine longwall mining panels in the South of Divide mining azea, as currently <br />planned, will not affect Minnesota Reservoir. The reservoir is located outside the area of mining <br />influence, using the most conservative 45-degree angle of draw. <br />In order to verify and demonstrate the accuracy of predictions, based on the results of past <br />subsidence observations in the Apache Rocks and Box Canyon mining areas, MCC will <br />implement the following three procedures to monitor this important agricultural structure prior to <br />mining. The following procedures will be implemented as soon as permitting allows, in order to <br />account for seasonal precipitation changes. <br />1. Conduct annual aerial photo surveys of the landslides located north and south of the <br />reservoir, using the July 2004 photos as a baseline reference. Surveys will continue while <br />mining is occurring within Panels EI through E9 <br />2. Install, and periodically measure, survey monuments strategically located on the dam and on <br />the north, south, and east edges of the reservoir to monitor any movement prior to, during, <br />and after mining in the area. A line of monuments will be placed on a 100-foot spacing <br />across the crest of the Monument Dam, and then at 500-foot centers along the north <br />shoreline of the maximum pool elevation to Horse Gulch, thence north across the two panels <br />north of Minnesota Reservoir in section 29. In addition, a line of monuments will be <br />located in a line on 500-foot centers from the south abutment of the Monument Dam to the <br />NW comer of panel E9. The purpose of the most northern monuments is to validate the <br />model used to predict subsidence as mining advances to the south towazd the Minnesota <br />Reservoir. The purpose of monitoring the panel immediately north of the Minnesota <br />Reservoir would be to validate the prediction that ground movement did not reach the <br />Minnesota Reservoir impoundment or the Monument Dam embankment. Monuments <br />across the Monument Dam validate the prediction of no movement on the structure. <br />Monuments to the south serve to validate a prediction of no ground movement reaching the <br />Minnesota Reservoir or Monument Dam from mining in panel E9. <br />3. Install seismometers in strategic locations, such as in the dam azea and toe areas of the <br />landslides at the dam abutments, in order to detect vertical and horizontal ground motion <br />prior to, during, and after mining, particularly during the mining of Iongwall panel E9. <br />A report will be generated based on the above monitoring and delivered to the CDMG. The <br />report will be generated after mining is completed in longwall panels El through E9. However, <br />if significant changes to the am an or reservoir aze note as a resu o e monitoring, a <br />sepazate report will be generated and submitted within three months of noting the significant <br />• change. If the c_ hanees appeaz to compromise the integrity of the dam or reservoir, the Division <br />and other appropnate agencies will be notified within three days or sooner if warranted. <br />~ - ------ <br />1.05-135 Revised November 2004 PRIG <br />
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