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<br />Sencca Coal Company liichwall Minine Addendum <br />MSNA LD. OS-00304 March I S, 200a <br />• 1~'ch Pill:u• ~1'itlth - tia;~c Crcck tir.1m <br />Design Minin Hei ht, ft <br />Depth of Cover, ft 4 4.5 5 5.5 6 6.5 7 7.5 B 8.5 9 9.5 10.5 <br /> <br />75 ;/, id' ;o al a~ ~r5 •rr; ax +u .f! ~+ +•r ±~ <br />1OO al 42 4~ QS 1' •JS SC1 5: S~ 55 S- tV /i <br />125 •I i 49 i0 51 >: 5. jJ sG ?,~' ti0 a. (.3 r.'. <br />150 S 55 >G S8 ar ti0 61 ti: n? ti4 ah G8 " <br />175 5~ 61 63 b5 ab 58 69 i0 7? 73 ;•I 75 '? <br />200 6J 67 60 71 75 77 78 80 81 8? 84 8t. <br />225 ~D 72 '~ 77 RO 82 8•t 86 8S 89 vl 93 ~>[, <br />250 'S 78 Sl 8a rG 89 ~I 94~ u6 r18 100 102 In> <br />275 80 83 R7 40 ~; 96 '+`1 101 10.1 106 108 IIU lid <br />300 3~ K9 °~ 9G IOO 103 IOb IU9 ll_ Ila 117 119 I_'•t <br />326 'tu 9a vx loz roo Ilu II. 116 III, Izz Izs 1211 I?s <br />350 •~~ '>9 n?a IUA I C I I6 I_0 1"_'c I.? 131 I?a 177 Ls; <br />t.oar s[reng[n, psr 7w mnun~ moor, n + r.w rvv. wcq pnrare rY <br />Pillar widths .n italics have width-to-height ratios of less than 0 5 <br />ua <br />• t2o <br />x <br />° <br />~ 96 <br />z <br />5 <br />J <br />a <br />m <br />° <br />~ 72 <br />'a <br />a <br />ae <br />• <br /> M+mng <br /> Hc~~nt, <br /> I; <br /> -+-4 <br />~ <br />i` <br />° 4.5 <br /> <br />i <br />J <br />J -x- 5 <br />--+- 5.5 <br /> <br />' <br />if <br />m <br />° <br /> <br />W <br />Q - 6 <br /> <br /> <br />6.5 <br />I 7 <br />~ <br /> -s-75 <br /> ~- 8 <br />-i- 8.5 <br /> -s <br /> ' 9.5 <br /> <br /> 10.5 <br /> ~~~. <br />2t <br />0 50 100 150 200 250 300 35C t00 <br />DEPTH OF COVER, h <br />Figure 35a- ~4'eU pillar design chr,ns for Sage Crcck se:un. Sencca I I- W Pit. <br />