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• <br /> ~s~bs~`a`~ _ _ -- <br />` <br /> ~' critical width <br /> 12~~-48 ~ depth W/D x D = <br /> 19 ~-6 7 ~ C~ recovery 1.3 x 250' = 325' <br /> line <br /> 80~- 250 <br />If subsidence occurs: <br />A. Maximum <br />W/D = 1050 = 13.1 = SOX (~ <br />80 excellent RQD 48" @ depth - <br />1300 = 5.2 = SOX @ 84" @ outcrop <br />250. excellent RQD <br />I90~ <br />• <br />W/D = 1200 = 6.3 = 60X w/ <br />190 fair RQDI <br />700 F <br />= 3.7 = 60% w/ <br />190 J <br />fair RQD <br />W/D = 1200 = 30 = 60% w/ <br />40 fair RQD <br />650 = 16.2 = 60% w/ <br />40 fair RQII <br />Fault <br />B. Minimum (20%) Block <br />3 <br />A. Maximum <br />48" @ outcrop - <br />52" @ depth <br />50" @ depth - 60" @ outcrop <br />Subsidence @ Lower PJnnacle = .6 x 60" @ outcrop = 36" <br />.6 x 50" @ depth = 30" <br />• <br />Subsidence @ Zone 3 = .6 x (36 + 48") @ outcrop = 50.4" <br /> .6 x (30 + 52") @ depth = 49.2" <br />Subsidence @ Surface = .5 (50.4 + 84) @ outcro = 67.2" <br /> .5 (49.2 + 48) @ depth = 48.6" <br />B. Plinimum @ 20% of Mining Thickness <br />Subsidence @ Lower 1'lnnacle = .2 x 60" _ ]2" <br /> .2 x 50" = 10" <br />Subsidence @ Upper I'Jnnarle = .2 (]2 + 48) _ ]2" <br /> <br />Sub5ldcnce @ Surfaco = .2 (72 + 84) = 19.2" (~+ outcro <br />.2 (12.4 + 48) = 12.08" (d de th <br />202 <br />D. H. EMLING COMPANY <br /> <br />