2009-10-13_REVISION - C1981028

• Permit No: C1981028
• IBM Index Class Name: REVISION
• Doc Date: 10/13/2009
• Doc Name: Review Letter & Cost Estimate
• From: DRMS
• To: Coors Energy Company
• Type & Sequence: SR1
• Email Name: JHB
• Media Type: D
• Archive: No

BOREHOLE SEALING WORK
Task #: 48
Mine: Keenesburg Mine
Permitno.: C1981-028
Permitting action: MT5
Date: 4/30/09
User: jhb
wt of bulk cement
C
em
2,500 gal Water
Octoplug Cut surface
Hole Total Hole (assuming 94 Itis of
Cement cost Total rig Rig wl crew
water truck truck w/

i
(Circes, casing &

k
cement per 1.18 cf of Cement Rig setup time Rig time to time hourly rate Total w/driver dr
ver cost 57
519 mar
Total cost
Hole diam. depth volume per cwt
total cost
hole, that is 100 Ibs per hole (hr) fill hole (setup + (Circes, Reed rig cost
hourly rate
(rig fill .

in.
per
(Circes,
(CIRCES)
(in) (ft) (cf)
of cement fills 1.25 fill) drill, 9.0")
(Circes) x
time
diam.) $5.4611f+$2.1
cf) truck rate) 71marker)
FPW1 8 61 21 17.0 $7.46 $127 0.67 0.50 1.17 $224.03 $262 $60 $30 $157 $8 $583
Water Supply 8 620 216 173.1 $7.46 $1,291 1.52 2.16 3.68 $224.03 $825 $60 $130 $157 $8 $2,410
DH96 5 55 7 6.0 $7.46 $45 0.67 0.50 1.17 $224.03 $262 $60 $30 $98 $8 $442
DH122 5 43 6 4.7 $7.46 $35 0.42 0.50 0.92 $224.03 $206 $60 $30 $98 $8 $377
SMW-2 4.75 97 12 9.5 $7.46 $71 0.67 0.50 1.17 $224.03 $262 $60 $30 $93 $8 $464
AMW-1 4.5 61 7 5.4 $7.46 $40 0.67 0.50 1.17 $224.03 $262 $60 $30 $88 $8 $428
AMW-2 6 51 10 8.0 $7.46 $60 0.67 0.50 1.17 $224.03 $262 $60 $30 $117 $8 $477
Total hours 10.45 Grand total $5,181
Divided by number of rigs 1
Net total hours 10.45