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l3arricr Pillar \\'idih - \1'adge and ~\~olf Creek Seams <br />Design Minin Height, ri <br />epth o1 Cover, ri <br />50 <br />85 4 <br /> <br />t S <br />~ <br />i 6 <br /> <br />~ 7 <br />? <br />5 6 <br />~ <br />~ 7 <br />? <br />~ 8 <br /> <br />~ 9 <br />3 <br />5 10 <br />3 <br />5 10.5 15 <br />3 3 <br />S 5 20 25 <br />3 3 <br />6 6 <br />120 !~ -r - 7 7 8 3 8 8 9 9 <br />155 ~ v ~i lU ? 10 u. 10 11 11 12 13 13 <br />190 I~~ 11 II 12 II I? 13 13 14 14 15 17 16 <br />225 Is' 13 la li la I> I~ 18 t7 17 19 21 23 <br />260 to IS Iri 17 le 17 18 19 20 20 23 26 28 <br />295 Iii 17 I~ 20 19 2U 21 22 23 23 2T 30 33 <br />330 IS 19 ^I 22 ^I 22 2a 25 26 27 31 35 38 <br />365 'U 22 '_? _'` 21 25 27 28 29 30 35 39 43 <br />400 ~a ~<, ^8 2c, 28 ^~~ 31 32 33 39 44 a8 <br />035 't -'~~ 2s 30 '2R 3U 3= 34 36 36 43 49 54 <br />470 'S 'S ?I 3? 31 ?3 ~; 37 39 40 47 53 59 <br />Coal strength, psi 1U3~ mining wtam, n i t `~r rvo. weu ym ars <br />•c <br />5 <br />n <br />K <br />w <br />K <br />Q <br />m <br />0 <br />W <br />0 <br />W <br />C <br />• I rare .i4b- [3arricr pillar desien charts for VVadee and Wolf Creek scams. <br />Sencca II-\~' and 1'oasl Pits. <br />Mining <br />Height, <br />ft <br />~- 4 <br />5 <br />->~ 8 <br />-+-7 <br />-- 8 <br />7 <br />6 <br />-F9 <br />-t+-10 <br />~~ 10.5 <br />15 <br />20 <br />25 <br />Q 0'D ~~ t50 200 ~50 300 350 4U0 450 <br />DEPTH OF COVER, n <br />