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 16
Design Mining Height, ft
Depth of Cover, ft 7 7.5 8 1 8.5 9 9.5 10 10.5 11 11.5 12 112.5 I 13
190 60.2 59.4 58.3 57.5 56.8 55.8 55.1 54.4 53.5 52.9 52.3 51.5 50.5
210 58.6 57.6 56.8 55.8 54.9 54.2 53.3 52.6 51.8 51.2 50.4 49.8 49.3
230 57.1 56.1 55.1 54.2 53.3 52.4 51.8 51.0 50.2 49.4 48.8 48.1 47.6
250 55.7 54.7 53.5 52.6 51.8 51.0 50.2 49.4 48.6 47.9 47.2 46.7 46.0
270 54.6 53.6 52.4 51.4 50.4 49.6 48.8 47.9 47.2 46.5 45.8 45.2 44.6
290 53.6 52.6 51.4 50.3 49.4 48.4 47.4 46.7 46.0 45.2 44.6 43.9 43.2
310 52.6 51.5 50.5 49.5 48.4 47.4 46.5 45.7 44.8 44.0 43.3 42.6 42.0
330 51.4 50.4 49.4 48.3 47.4 46.5 45.6 44.7 43.9 43.2 42.4 41.6 40.9
350 50.1 49.3 48.3 47.3 46.4 45.6 44.7 43.9 43.1 42.3 41.6 40.8 40.1
370 48.8 47.9 47.0 46.3 45.3 44.5 43.61 42.9 42.2 41.4 40.7 40.0 39.4
390 47.5 46.6 45.7 44.9 44.1 43.5 42.8 41.9 41.11 40.5 39.7 39.1 38.4
410 46.4 45.4 44.6 43.8 43.0 42.3 41.6 40.9 40.2 39.5 38.9 38.2 37.5
430 45.2 44.2 43.4 42.5 41.8 41.1 40.5 39.8 39.21 38.6 38.01 37.3 36.7
Coal strength, psi 821 Mining width, ft 11.50 No. web pillars 19
65
Mining
60 Height,
ft
t 7
7.5
55 �
mac-8
+8.5
w + -9
50 9.5
4 L + 10
i 10.5
11
45 I �
�11.5
II �12
+ 12.5
40 13
III-III I
lip
35
190 210 230 250 270 290 310 330 350 370 390 410 430
DEPTH OF COVER ft
Figure 5c. Raw Recovery-Collom D1/D2 Seam
Agapito Associates, Inc.