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FIGURE 20-1 <br />Mine Aren Boundnry <br />brio <br />Mine <br />soil <br />•rial <br />urge <br />~nterior PostMining Spoil Material Voturn <br />Disturbnnce Aren Boundnry <br />P^STMINING MATERIAL V^LUME DETERMINATION <br />Postmining Topography <br />Typical Mass <br />Balance Illustration <br />Virgcn ^verburden VoiuMe <br />^rignal <br />round <br />Surface <br />'op of Conl <br />Coal Voluroe~ ~~$ottarl of <br />PREMINING MATERIAL V^LUME DETERMINATI^N Conl <br />^riginal Ground <br />Estinnted Postnin~ng Surface <br />Land Forts Surface _ xterior <br />_~ <br />^v rburden <br />Materi l Voluble <br />i <br />i~ <br />• <br />