PERMFILE47424

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 10/6/2004
• Doc Name: Geotechnical Design & Operational Considerations for Highwall Mining, IIW & Yoast Areas
• Section_Exhibit Name: Tab 12 Attachment 12-3 Part 2
• Media Type: D
• Archive: No

Figures (Continued)
42b. Safety factor plot for failed pillar configuration. Wadge seam. Yoast pit.
43a. Yield condition plot for failed pillar configuration. Wolf Creek seam. Yoast pit.
43b. Safety factor plot for design configuration. Wolf Creek seam. Yoast pit.
44a. Yield condition plot for failed pillar configuration. Sage Creek seam. II-W pit. Wolf
Creek seam mined out with design configuration.
44b. Safety factor plot for failed pillar configuration. Sage Creek seam. II-W pit. Wolf
Creek seam mined out with design configuration.
45a. Yield condition plot for design configuration. Wolf Creek seam. Il-W pit. Sage
Creek seam mined out with failed central web pillar.
45b. Safety factor plot for design configuration. Wolf Creek seam. II-\\~ pit. Sage Creek
seam mined out with failed central web pillar.
46a. Yield condition plot for failed pillar configuration. Wolf Creek seam. Il-W pit. Sage
Creek seam mined out with design configuration.
46b. Safety factor plot for failed pillar configuration. Wolf Creek seam. II-W pit. Sage
Creek seam mined out with design configuration.
47a. Yield condition plot for design configuration. Sage Creek seam, II-W pit. Wolf
Creek seam mined out with failed central web pillar.
47b. Safety factor plot for design configuration. Sage Creek seam. II-W pit. Wolf Creek
seam mined out with failed central web pillar.
48. Layout of UDEC mode] for Seneca IIW, Wolf Creek and Sage Creek seam mining,
21 ft interburden.

49.
Layout of UDEC mode] for Seneca II\>J, Wolf Creek and Sage Creek seam mining. •
30.5 ft interburden.
50. Layout of UDEC mode] for the Seneca IIW Area, Wadge Seam mining.
51. Layout of UDEC model for the Yoast Area Wolf Creek Seam mining.
52. Layout of UDEC model for the Yoast Area Wadge Seam mining.
53a. UDEC model results for the Seneca Il1rJ Area. \rJolf Creek mining. Mohr-Coulomb
V
safety factors.
53b. UDEC mode] results for the Seneca IIW Area. Wolf Creek mining. vertical stress.
53c. UDEC mode] results for the Seneca IIW Area. \>Jolf Creek minine. vertical
displacement.
54a. UDEC model results for the Seneca Ill\~ Area. Wolf Creek and Sage Creek mining.
~ y
21 ft interburden, Mohr-Coulomb safety factors.
54b. UDEC model results for the Seneca II\'J Area, Wolf Creek and Sage Creek mining,
21 ft interburden. vertical stress.
54c. UDEC model results for the Seneca IIW Area. Wolf Creek and Saee Creek mining.
y
21 ft interburden, vertical displacement
55a. UDEC mode] results for the Seneca Ill'J Area. \~olf Creek and Sage Creek minine.
y
30.5 ft interburden. Mohr-Coulomb safety factors.
SSb. UDEC model results for the Seneca IIW Area. Wolf Creek and Sage Creek mining.
21 ft interburden, vertical displacement.
SSc. UDEC mode] results for the Seneca ]I\\~ Area. Wolf Creek and Sase Creek minine.
y
21 ft interburden, vertical stress. •