REP18833

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 9/2/1997
• Doc Name: PREDICTED LONGWALL SUBSIDENCE FOR THE SANBORN CRK MINE OXBOW CARBON MINERALS INC SOMERSET CO
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

1 Sanborn Creek Subsidence Page 6 September 2, 1997
Table 1. Approximate interburden spacings and lithologic
distributions between coal seams.
Borehole Shale Sandstone Coal Total
Ident. ($ in ($ in ($ in Interburden
section) section) section) Thickness
(feet)
"E" Seam to "D" Seam
WSC-1 28.5$ 56.4$ 15.1$
WSC-2 36.8$ 52.0$ 11.2$
WSC-4 57.8$ 33.5$ 8.7$
WSC-7 ----- ----- -----
Mean 41.0$ 97.3$ 11.7$
Std Dev 15.1$ 12.2$ 3.2$
"D" Seam to "C" Seam
WSC-1 28.5$ 70.9$ 0.6$
WSC-2 40.8$ 59.2$ 0.0$
WSC-4 99.0$ 54.3$ 1.7$
WSC-7 ----- ----- -----
Mean 37.8$ 61.5$ 0.8$
Std Dev 8.2$ 8.5$ 0.9$
"C" Seam to "B" Seam
WSC-1 63.3$ 36.7$ 0.0$
WSC-2 ----- ----- -----
WSC-4 28.5$ 71.5$ 0.0$
WSC-7 ----- ----- -----
Mean 95.9$ 59.1$ 0.0$
Std Dev 24.6$ 29.6$ 0.0$
"E" Seam to "C" Seam
WSC-1 27.9$ 63.3$ 8.7$
WSC-2 38.3$ 55.0$ 6. 6$
WSC-4 98.2$ 46.6$ 5.1$
WSC-7 ----- ----- -----
Mean 38.1$ 55.0$ 6.8$
Std Dev 10.2$ 8.4$ 1.8$
195.8
135.8
84.1
138.2
125.9
28.2
192.1
188.5
199.3
195.0
193.7
4.6
91.3
34.6
59.3
96.7
44.2
8.4
344.8
331.1
307.1
339.1
338.5
16.6
6