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 10

Agapito Associates, Inc.

Figure 3c. Raw Recovery—Collom B2/B3 Seam
Design
Depth of Cover, ft 33.544.555.566.577.588.59
110 72.4 70.8 69.0 67.6 66.2 64.9 64.0 62.8 61.6 60.8 60.0 58.9 58.1
130 69.9 68.3 66.6 65.3 63.7 62.5 61.3 60.2 59.1 58.0 57.0 56.1 55.4
150 67.6 66.0 64.5 63.1 61.6 60.2 58.8 57.8 56.5 55.5 54.6 53.7 52.8
170 65.4 63.8 62.2 60.9 59.6 58.1 56.7 55.5 54.4 53.4 52.4 51.4 50.5
190 63.4 61.6 60.1 58.7 57.4 56.3 54.9 53.9 52.6 51.3 50.3 49.4 48.4
210 61.5 59.7 58.1 56.6 55.3 54.2 53.0 51.9 51.0 49.9 48.8 47.8 46.7
230 59.7 57.8 56.2 54.6 53.2 52.1 50.9 49.9 48.9 48.0 47.1 46.2 45.4
250 58.2 56.2 54.5 52.9 51.4 50.2 49.0 47.9 46.9 46.0 45.1 44.3 43.5
270 56.6 54.6 52.8 51.1 49.7 48.4 47.2 46.1 45.2 44.1 43.3 42.5 41.6
290 55.1 53.0 51.3 49.7 48.2 46.8 45.6 44.5 43.4 42.4 41.6 40.7 39.9
310 53.8 51.6 49.8 48.1 46.7 45.4 44.1 42.9 41.9 40.9 40.0 39.1 38.3
330 52.6 50.3 48.4 46.8 45.3 43.9 42.6 41.5 40.4 39.4 38.5 37.7 36.8
350 51.3 49.1 47.3 45.6 44.0 42.5 41.3 40.1 39.1 38.1 37.2 36.4 35.6
Coal strength, psi 495 Mining width, ft 11.50 No. web pillars 19
Mining Height, ft
30
35
40
45
50
55
60
65
70
75
110 130 150 170 190 210 230 250 270 290 310 330 350RAW RECOVERY, % DEPTH OF COVER, ft
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
Mining
Height,
ft