REP42036

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 9/4/1997
• Doc Name: 1997 Mid-Year Subsidence Report
• From: Mountain Coal Company
• To: DMG
• Permit Index Doc Type: Subsidence Report
• Media Type: D
• Archive: No

WEST ELK MINE B-SEAM SUBSIDENCE UPDATE THROUGH JULY 1997
SUBSIDENCE POINT # E1 E2 E3 E4 ES NO N1 N2 N3
PRE-MINING NORTHING 395419.34 395413.06 395406.39 395399.85 395394.27 396398.96 396498.56 396598.06 396698.26
B SEAM FASTING 1443066.29 1443166.15 1443265.63 1443365.85 1443465.69 1442073.70 1442080.29 1442086.65 1442093.35
SURVEY #1 ELEVATION 7476.75 7448.15 7438.49 7431.09 7440.39 ]881.89 7876.54 7872.69 7872.67
0CT. 1991
PRE-MINING NORTHING 395419.31 395413.02 395406.29 395399.88 395394.02 396396.]9 396498.48 396598.00 396698.09
B SEAM FASTING 1443066.11 1443165.88 1443265.38 1443365.89 1443465.52 1442073.85 1442080.34 1442086.01 1442093.52
SURVEY #2 ELEVATION ]4]6.87 7448.23 7438.62 7431.19 7440.50 7881.86 7876.54 7872.70 78]2.69
JUNE 1992
AVERAGE OF NORTHING 395419.33 395413.05 395406.34 395399.87 395394.15 396398.88 396498.52 396598.03 396698.18
PRE-MINING FASTING 1443066.20 1443166.02 1443265.51 1443365.87 1443465.61 1442073.78 1442080.32 1442086.33 1442093.44
B-SEAM ELEVATION ]4]6.81 7448.19 ]438.56 7431.14 7440.45 ]881.88 ]8]6.54 ]8]2.70 ]872.68
POST-MINING NORTHING 395418.96 395412.5] 395405.85 395399.26 395393.36 396398.52 396498.19 39659].66 396697.53
B-SEAM FASTING 1443066.27 1443165.97 1443265.86 1443365.69 1443465.05 1442073.60 1442079.87 1442086.18 1442092.90
SURVEY X3 ELEVATION ]476.98 7448.39 ]638.77 7431.32 7440.64 7880.96 ]875.13 ]8]0.64 ]8]0.10
OCT. 1992
POST-MINING NORTHING 395418.67 395412.40 395405.56 395399.03 395393.41 396396.60 396496.53 396596.13 396696.22
B-SEAM FASTING 1443066.21 1443185.87 1443265.62 1443365.85 1443465.05 14420]2.09 1442078.55 1442084.48 1442091.76
SURVEY #4 ELEVATION 7477.41 7448.82 7439.23 7431.81 7441.14 7878.50 7871.24 ]86].4] 7867.4]
JUL. 1993
POST-MINING NORTHING 395419.18 395412.86 395406.0] 395399.62 395393.95 396396.51 396496.53 396596.06 396696.12
B-SEAM FASTING 1443066.18 1443165.94 1443265.55 1443365.64 1443465.20 14420]0.9] 1442077.63 1442084.10 1442090.73
SURVEY #5 ELEVATION 7476.79 7448.18 7438.58 7431.15 7440.50 7875.81 7870.56 7866.71 7866.84
OCT. 1993
POST-MINING NORTHING 395419.02 395412.70 395405.91 395399.46 395393.52 396396.40 396496.20 396595.84 396695.80
B-SEAM FASTING 1443065.84 1443165.59 1443265.20 1443365.29 1443465.53 1442070.61 1442076.91 1442063.31 1442090.40
SURVEY #6 ELEVATION 7476.79 7448.20 7438.61 7431.19 7440.53 7876.78 7870.54 7866.70 7866.82
JUL. 1994
POST-MINING NORTHING 395419.53 395413.21 395406.25 395399.96 395394.12 396396.63 396496.54 396596.04 396696.24
B-SEAM FASTING 1443065.98 1443165.84 1443265.80 1443366.60 1443465.03 1442070.30 14420]6.80 1442083.29 1442090.00
SURVEY X7 ELEVATION 7476.39 7447.75 7438.12 7430.70 7440.02 7875.82 7870.54 7866.71 7866.81
OCT. 1994
POST-MINING NORTHING 395418.56 395411.84 395404.74 395398.07 395392.03 396396.29 396496.34 396595.48 396695.85
B-SEAM FASTING 1443066.03 1443165.74 1443265.45 1443365.44 1443465.19 1442070.16 1442076.69 1442083.20 1442090.13
SUflVEV #8 ELEVATION 74]].15 ]448.54 7438.90 ]431.48 ]440.82 ]875.84 ]870.62 ]866.83 ]866.94
AUG. 1995
POST-MINING NORTHING 395419.19 395412.90 395406.06 395399.]2 395393.80 396396.35 396496.22 396595.85 396695.89
B-SEAM FASTING 1443065.60 1443165.2] 1443264.89 1443365.02 1443465.02 14420]0.31 14420]6.85 1442083.26 1442090.13
SURVEY #9 ELEVATION ]4]].33 ]448.]1 7439.12 ]431.]0 ]441.02 7875.9] 78]0.68 ]868.85 ]866.96
OCT. 1995
POST-MINING NORTHING 395419.10 395412.82 395406.08 395399.80 395394.30 396396.3] 396496.32 396595.84 396695.94
B-SEAM FASTING 1443065.64 1443165.41 1443264.92 1443365.33 1443465.17 14420]0.04 14420]6.8] 1442083.19 1442089.95
SURVEY #10 ELEVATION ]4]].62 ]449.04 ]439.45 ]432.03 ]441.35 ]8]5.94 ]8]0.]3 ]868.92 ]86].03
JULY 1996
POST-MINING NORTHING 395419.2] 395412.92 395406.30 395399.]5 395394.14 396396.48 396496.32 396595.90 396696.04
B-SEAM FASTING 1443065.70 1443165.48 1443265.06 1443365.26 1443465.05 1442070.14 1442076.69 1442083.20 1442089.89
SURVEY #11 ELEVATION ]4]].56 ]448.99 ]439.39 ]431.99 ]441.29 ]8]5.93 ]8]0.]0 ]866.8] ]866.96
0CT. 1996
PORT-MINING NORTHING 395418.99 395412.65 395405.72 395399.14 395393.33 396396.45 396496.38 396595.91 396695.99
B-SEAM FASTING 1443065.]2 1443165.31 1443264.96 1443365.16 1443464.96 14420]0.24 14420]6.84 1442083.24 1442/190.23
SURVEY #12 ELEVATION 7477.44 7449.16 7439.55 7432.14 7441.46 7875.89 7870.61 7866.81 7866.93
JULY 1997
SUBSIDENCE (CURRENT) _ _______ _ ______ _ ______ _ ______ _ ______ _ ______ _ ______ _ ______ _ ______
from OCT. 1996 to JULY 1997 0.12 0.17 -0.16 -0.15 -0.17 0.04 0.09 0.06 0.03
1-1 Indicates Rise in Elevation
T0TAL SUe51DENCE -0.63 -0.97 -0.99 -1.00 -1.02 5.98 5.93 5.88 5.]5
from average pre mining survey
to JULY 1997
AV N.-10/92 N. ------- -----0.36 - ----0.48 - ----0.49 - ----0.61 - ----0.79 - ----0.35 - ----0.33 - ----0.3] - ----O.fiS
AV E. - 10/92 E. -0.0] 0.05 -0.3] 0.18 0.55 0.1] 0.44 0.15 0.54
AV EL- 10/92 EL -0.1] -0.20 -0.22 -0.18 -0.20 0.91 1.41 2.05 2.58
10/92 N.-7/93 N.-----_ -_---0.29 - ----0.17 - ----0.29 - ----0.23 - ----0.05 - ----1.92 - ----1.66 --_--1.53 - 3=_-1.31
10/92 E.- ]/93 E . 0.06 0.10 0.26 -0.16 0.00 1.51 1.32 1.]0 1.14
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