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. 2. Avers <br />a. <br />b. <br />c. <br />d. <br />average subsidence ~12 1 (325) + (12) (975) _ <br />2 <br />ge subsidence @ depth <br />average depth - 250' <br />critical width - 325' <br />width of workings - 1300' <br />maximum subsidence - 12" - 48" <br />~.161.5~.~. B76'-Ti62.5+) <br />--__ <br />'o ~ 26^ ~ f 26' / <br />n ~ ~ <br />\ ~ ~ / <br />-- 1300 <br />10.5" to <br />1300 <br /> <br />C48 l(325) + (48) (975) _ <br />z <br />1300 <br />42" <br />weighted average from outcrop to depth (1:9) <br />Wt.Ave. <br />1 9 = 11.3" <br />18.1 10.5 <br />63.7 42 = 44.2" <br /> <br />2( ~ <br />D. H. EMLING COMPANY <br />