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<br />II <br />,•.Ill i• <br /> <br />fonornl Rcln[lunshlp 14rtwccn I'/•rrcnt Suhsldcnrc :Ind <br />1'nnolwidth to MJnInR U/•pth Rain <br />Illlnoiti Mlncs <br /> <br />• <br /> <br />t <br />.°~° 20 <br />d <br />x <br />00 <br />C <br />H <br />,~ 40 <br />r. <br />0 <br />60 <br />ai <br />u <br />a <br />AI <br />9 <br />N QQ <br />N <br />0.5 <br />Development and for e[iraCtion <br />7 <br />~ L,7 ~ ~ O <br />O A ~ 0 O <br />O <br /> O O <br />O <br /> <br />^ O ~ <br /> `` <br /> <br />~~ ~ '-- <br />YEDIUY E%TRACTION <br />\ O XIBX E%TRACT IOM O <br />~ ^ RETREIT MININ9 <br />~ O LONOrALL <br /> <br />I.0 I.5 2.0 <br />Panel Widtlt/toning Depth <br />Source: Hunt, Steven R., Froceedinp~s of the Illinois Mini <br />Instltnte, 1978; Illinois CenloRical Survey <br />20( <br />7 <br /> <br />