Consider a single long wall panel in a seam mined full height of5mat a depth of 400 m. The panel has a face width of 300 m; panel length will eventually reach 3,000 m. The seam is flat. Mining occurs at a rate of 8,000 tons per shift (1 ton = 2,000 lbs), two production and one maintenance shift per day, 5 days per week. Assume UK conditions, then determine for a single panel:

1. Maximum subsidence expected

2. Critical area

3. Subsidence trough width

4. Maximum tensile strain

5. Maximum compressive strain

6. Severity of damage (25 m structure width)

7. Compressive strain at the center of the rib-side subsidence profile

8. Maximum subsidence when the panel has advanced only 200 m

9. Time required to mine the panel

10. Maximum subsidence after mining four panels side by side and

11. Maximum subsidence after mining a single panel at 400 m and an identical panel 420 m depth directly below.