Question: With reference to the sketch, Table 6.13, and the lower coal seam, what is the maximum possible extractionratio? Table 6.13 Strata properties h(ft) (m) E(1

With reference to the sketch, Table 6.13, and the lower coal seam, what is the maximum possible extractionratio?

Table 6.13 Strata properties h(ft) (m) E(1 0)psi (GPa) Co(psi) (MPa) Rock

Table 6.13 Strata properties h(ft) (m) E(1 0)psi (GPa) Co(psi) (MPa) Rock -pef (kN/m?) To(psi) (MPa) type 50 I Over 1,000 144.0 1.70 0.25 1,694 (516) burden (22.8) (I1.7) (6.9) (0.34) 3.00 2 Massive 148.2 0.20 19,000 850 1,714 (23.4) (20.7) (522) sandstone (131.9) (5.86) 0.30 3 Coal 75.0 0.35 3,500 130 1,719 (11.9) (2.4) (24.1) (0.90) (524) 4 Layered 17,500 (120.7) 1,741 149.5 1.50 0.10 700 (23.6) (4.83) sandstone (10.3) (531) 5 Massive 148.2 3.00 0.20 19,000 850 1,744 (20.7) sandstone (23.4) (131.0) (5.86) (532) 6 Sandy shale 15,000 1,000 170.0 4.50 0.10 1,747 (31.0) (26.9) (103.4) (6.90) (533) 7 Coal 75.0 0.30 0.35 3,500 1,300 1,754 (24.1) (I1.9) (2.4) (8.97) (535) 8 Massive 1,000 (6.90) 148.2 3.50 0.20 19,500 1,778 (542) sandstone (23.4) (24. 1) (134.5) 9 Layered 149.5 1.50 0.10 17,500 700 2,250 (658) sandstone (23.6) (10.3) (120.7) (4.83) Sketch and geologic column

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