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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.
Longwall Mining:
Subsidence Related
Make appropriate comments on your developed data.
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