2022-01-27_PERMIT FILE - C1981019 ‎(7)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 1/27/2022
• Doc Name: Addendum Collom and South Taylor Highwall Mining Geotechnical Design
• Section_Exhibit Name: Volume 20 Exhibit 27 Item 7
• Media Type: D
• Archive: No

Mr. Lee Sampson
December 7, 2021
Page 13

Agapito Associates, Inc.

Figure 4c. Raw Recovery—Collom C3/C5 Seam
Design
Depth of Cover, ft 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11
130 71.6 70.5 69.0 67.4 65.8 64.5 63.1 61.7 60.3 59.1 58.1 56.9 55.8
160 68.6 67.5 66.5 65.5 64.5 63.6 62.4 61.0 59.7 58.4 57.5 56.3 55.2
190 66.1 64.8 63.8 62.6 61.7 60.8 59.7 58.9 58.1 57.4 56.6 55.7 54.5
220 63.8 62.6 61.4 60.2 59.4 58.3 57.2 56.5 55.5 54.8 53.9 53.2 52.6
250 62.4 60.7 59.4 58.2 57.2 55.9 55.0 54.2 53.4 52.5 51.6 50.8 50.2
280 60.6 59.4 58.0 56.6 55.5 54.2 53.1 52.2 51.3 50.3 49.6 48.8 48.1
310 58.9 57.6 56.3 55.1 54.0 52.8 51.8 50.7 49.7 48.7 47.9 46.9 46.2
340 56.7 55.7 54.7 53.5 52.4 51.4 50.4 49.4 48.4 47.4 46.5 45.7 44.8
370 54.9 53.9 52.7 51.6 50.8 49.8 48.8 47.7 46.8 46.0 45.2 44.4 43.6
400 53.1 52.0 50.9 49.9 48.9 48.1 47.2 46.3 45.5 44.5 43.8 43.0 42.2
430 51.7 50.4 49.2 48.2 47.1 46.3 45.4 44.6 43.9 43.2 42.4 41.6 40.9
460 50.1 48.8 47.6 46.6 45.7 44.7 43.9 43.0 42.2 41.5 40.8 40.2 39.5
490 48.7 47.4 46.1 45.1 44.1 43.2 42.3 41.5 40.7 40.0 39.2 38.6 38.0
Coal strength, psi 900 Mining width, ft 11.50 No. web pillars 19
Mining Height, ft
30
35
40
45
50
55
60
65
70
75
130 160 190 220 250 280 310 340 370 400 430 460 490RAW RECOVERY, % DEPTH OF COVER, ft
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
Mining
Height,
ft