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PERMFILE70463
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PERMFILE70463
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Entry Properties
Last modified
8/24/2016 11:19:35 PM
Creation date
11/20/2007 11:22:34 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
6/2/2006
Section_Exhibit Name
Exhibit 60D 2004 Geologic Hazard Field Observ for the South of Divide Mining Area
Media Type
D
Archive
No
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2004 Geologic Hazard Field Observations <br />South of Divide Mining Area <br />• <br />Maximum vertical displacement of 11.2 feet is expected within the area of mining <br />influence of the northern limit of longwall panel E9 in the landslide area <br />7.1.2 Maximum Tilt <br />Maximtmm tilt (Mm) is calculazed from differential vertical displacements that were measured az <br />the West Elk Mine monitoring network in terms of the ratio of maximum vertical displacement <br />to overburden depth to the seam being mined (Sm/d) (Table 1). <br />Panels El to E8: Maximum tilt in these panels is projected to range from 0.007 to 0.037 <br />(0.7 to 3.7 percent) where 8 feet of coal is extracted, from 0.013 to 0.044 (1.3 to 4.4 percent) <br />where 12 feet of coal is mined, and from 0.013 to 0.064 (13 to 6.4 percent) where a 14 foot <br />thickaess of coal is mined (Table 1). Maximum tilt of 6.4 percent is expected to occtu within <br />the area of mining influence above the western limit of longwall panels E2 and E3 should 14 <br />feet of coal be extracted. <br />Panel E9: Maximum tilt in this panel is predicted to range from 0.034 to 0.044 (3.4 and 4.4 <br />percent), where 12 feet of coal is mined and from 0.039 to 0.052 (3.9 to 5.2 percent) where <br />14 feet of coal is produced. Maximum tilt of 5.2 percent feet is expected within the area of <br />mining influence of the northern limit of longwall panel E9 in the landslide area. <br />7.1.3 Maximum Horizontal Strain <br />r1 <br />U <br />The curves projected for tensile and compressive strain in the South of Divide Mining Area, <br />based on the West Elk Monitoring Network and the National Coal Board of the United Kingdom, <br />are shown in Figure 5 of Exhtbit 60B (November, 2004). The tensile strain values obtained from <br />these curves are considered to be conservative for the South-of-Divide mining Area. Tensile and <br />compressive horizontal strains are calculated, using the values obtained from the West Elk <br />Monitoring area, as adjusted for the values observed in the Apache Rocks Mining Ana, are listed <br />in Table 1. These numbers are believed to be conservative, based on annual observations over <br />the last six years in the Apache Rocks Mining Area <br />831-032.621 Wright Water Engineers. Ina Page 14 <br />November 2004 <br />
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