A longwall mine is planned in Illinois. The following data are given to you.
Mining depth- 1000 feet
Thickness of near surface weak overburden- 85 feet
Seam thickness- 6.5 feet
Panel width- 1250 feet
Unit weight of weak rock overburden- 135 pcf
Unit weight of competent overburden — 155 pcf
Average angle of draw for weak overburden- 43 degrees
Average angle of draw for competent overburden- 21 degrees
Size of the shaft- 26 feet diameter
Estimated area to be protected around the shaft on the surface- 270 ft x 130 ft
Seam is assumed to be relatively flat.
You have been asked to develop the following longwall mining related and subsidence related information for permitting.
Make appropriate comments on your developed data.
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