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2021-05-27_PERMIT FILE - C1981019 (10)
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2021-05-27_PERMIT FILE - C1981019 (10)
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Last modified
10/20/2021 8:35:57 AM
Creation date
10/20/2021 8:32:12 AM
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Permit File
Doc Date
5/27/2021
Doc Name
Geotechnical Stability Report For Highwall Mining At the Colowyo Coal Mine
Section_Exhibit Name
Exhibit 23, Item 1
Media Type
D
Archive
No
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March 21, 2014 <br />Page 42 <br />Design Depth <br />Mining Height (ft) <br />of Cover (ft) <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />60 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />80 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />100 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />120 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />140 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154j <br />164 <br />173 <br />183 <br />192 <br />160 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />180 <br />80 <br />87 <br />96j <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />200 <br />85 <br />91 <br />97 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />220 <br />90 <br />97 <br />103 <br />110 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />240 <br />95 <br />102 <br />109 <br />116 <br />123 <br />130 <br />136 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />260 <br />100 <br />108 <br />115 <br />122 <br />130 <br />137 <br />144 <br />150 <br />157 <br />164 <br />173 <br />183 <br />192 <br />280 <br />105 <br />113 <br />121 <br />129 <br />136 <br />144 <br />151 <br />158 <br />165 <br />172 <br />179 <br />186 <br />193 <br />300 <br />109 <br />1181 <br />12611 <br />134 <br />142 <br />150 <br />158 <br />166 <br />1731 <br />181 <br />188 <br />195 <br />203 <br />coal Strength (psi) UUU Mining Width (tt) 11.5U <br />`Pillar widths in italics have width -to- height ratios of 0.8 <br />P17 <br />d <br />v 180 <br />c <br />x <br />J <br />J <br />a_ <br />120 <br />e <br />60 <br />I <br />I I I <br />_ I <br />X--- <br />20 <br />w <br />15 <br />¢ <br />J <br />J <br />a <br />TI <br />10 j <br />5 <br />50 100 150 200 250 300 350 <br />DEPTH OF COVER (ft) <br />No. Web Pillars 19 <br />Mining <br />Height <br />(ft) <br />� 8 <br />9 <br />—A 10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />-+-17 <br />---18 <br />19 <br />20 <br />Figure 30a. Web Pillar Design Chart —South Taylor Pit, E and D2/E Seams <br />Agapito Associates, Inc. <br />
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