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2009-06-09_REPORT - C1980007
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2009-06-09_REPORT - C1980007
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Last modified
8/24/2016 3:47:29 PM
Creation date
3/29/2010 10:32:35 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
REPORT
Doc Date
6/9/2009
Doc Name
DRMS Review Memo Spring 2009 Subsidence Report
From
DRMS
To
File
Permit Index Doc Type
Subsidence Report
Email Name
TAK
Media Type
D
Archive
No
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Predicted impact <br />Item in permit Observed impact Prediction accurate? <br /> application <br /> Maximum 18.4 ft. Between 2000 and 2007 visual <br />Vertical in two-seam mining <br />areas <br />Less than 1 observations are used for verifying <br />Although subsidence <br />subsidence <br />magnitude . <br />ft. near panel edges the conceptual subsidence model, <br />rather than quantitative monitoring. <br />displacements have not been <br /> in single-seam <br />The Fall 2007 report and the current, surveyed since 1999, visual <br /> <br />mining areas. <br />Fall 2008 <br />re <br />ort included data from observations described in the <br /> , <br />p <br />pre-mining surveys of panel E-1 and Fall 2008 report indicate <br />Horizontal Maximum the thalweg of the Dry Fork of subsidence displacements and <br />displacement horizontal strain of <br />Minnesota Creek. Postmining the angle of draw have probably <br />magnitude 3.9% <br />surveys will be conducted after Panel not significantly exceeded the <br /> predicted values. <br /> E-1 and the Dry Fork are <br />Angle of draw 8 - 21 degrees undermined. <br /> No new undermining of USFS roads <br /> since previous report (Spring 2008). <br />USFS roads Rockfalls, cracking No new rockfalls or cracking Yes <br /> observed from previous <br /> undermining. <br /> No new undermining of USFS ponds <br />USFS ponds Draining since previous report (Spring 2008). Yes <br /> No new draining observed from <br /> previous undermining.
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