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PERMFILE102766
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PERMFILE102766
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Last modified
8/24/2016 9:56:32 PM
Creation date
11/24/2007 9:13:18 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981032
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
CHAPTER S MITIGATION SUBSIDENCE CONTROL PLAN
Media Type
D
Archive
No
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TABLE S-1 <br />Pillar Size Calculation <br />Heeker Project, Rio Blanco County, Colorado <br />General Data <br />' Coal Seam <br />Overburden <br />Overburden or interburden (ft) <br />Total overburden (f t) <br />Total pressure on virgin coal (PSI) <br />Pillar dimensions <br />Average seam height (£t) <br />Entry centers (ft) <br />• Crosscut centers (ft) <br />Entry width (f t) <br />Pillar width (f t) <br />Pillar length (ft) <br />Pillar strength <br />Average coal strength (PSI) <br />Crushing strength of coal aillar <br />Average Strength L'(tons) <br />Load on remaining suaoort <br />Average Load (tons) <br />Safety factors ' <br />L i •Load <br /> <br />J G <br />1,610 193 <br />~- 2,110 2,303 <br />2,321 2,533 <br />9 9 <br />130 140 <br />130 140 <br />20 20 <br />110 120 <br />110 120 <br />2,776 2,776 <br />,169,950 9,064,700 <br />,824,190 3,574,990 <br />2.54 2.54. <br />S-8 <br />
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