2021-05-27_PERMIT FILE - C1981019A ‎(7)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 5/27/2021
• Doc Name: Addendum Collom and South Taylor Highwall Mining Geotechnical Design
• Section_Exhibit Name: Volume 20 Exhibit 27 Item 7
• Media Type: D
• Archive: Yes

Mr. Lee Sampson
April 23, 2021
Page 19
Design Mining Height, ft
Depth of Cover, ft 4 4.33 4.67 I 5 5.33 5.67 6 1 6.33 6.67 7 7.33 7.67 8
140 73.1 72.3 71.5 70.4 69.6 68.9 68.5 67.8 66.5 65.6 64.6 63.7 62.9
170 70.4 69.6 68.51 67.8 67.0 66.4 65.4 64.7 64.1 63.5 62.91 62.2 61.7
200 68.1 67.1 66.31 65.3 64.7 63.7 63.1 62.2 61.6 60.7 60.11 59.6 59.0
230 66.5 65.4 64.31 63.2 62.4 61.5 60.7 59.8 59.3 58.4 57.91 57.1 56.6
260 65.0 63.7 62.8 61.8 60.81 59.9 58.9 58.0 57.2 56.3 55.81 55.1 54.4
290 62.6 62.0 61.1 60.2 59.1 58.3 57.5 56.7 55.8 55.0 54.21 53.5 52.7
320 60.7 59.8 58.9 58.1 57.3 56.5 55.81 55.0 54.1 53.4 52.81 52.1 51.2
350 58.9 58.0 57.0 56.2 55.4 54.7 53.91 53.2 52.6 51.9 51.11 50.5 49.7
380 57.1 56.1 55.3 54.3 53.6 52.7 52.01 51.4 50.7 50.1 49.51 48.91 48.2
410 55.5 54.5 53.6I .61 .8 51.1 50.3 49.7 48.9 48.3 47.7 47.2 46.6
440 54.0 53.0 52.1 51.0 50.2 49.4 48.6 48.0 47.3 46.6 46.1 45.4 44.9
470 52.7 51.6 50.5 49.7 48.7 48.0 47.2 46.5 45.8 45.1 44.5 43.9 43.3
500 51.3 50.3 49.2 48.31 47.4 46.5 45.8 45.1 44.3 43.7 43.0 42.4 41.9
Coal strength, psi 900 Mining width, ft 11.50 No. web pillars 19
75
70 Mining
Height,
ft
Irt� �4
65
- 4.33
+ �c-4.67
+5
w 60 5.33
I
5.67
3 +i 6
55 � �+I
6.33
+ 6.67
+I �7
50 -'rt
I* -7.33
L� 7.67
45
� 8
40
140 170 200 230 260 290 320 350 380 410 440 470 500
DEPTH OF COVER ft
Figure 6c. Raw RecoveryCollom E2 Seam
Agapito Associates, Inc.