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FIGURE 20-1 <br />Mine Aren Boundnry <br />Virgin ^verburden Volune <br /> <br />^riginnl <br />round <br />Surface <br />Top of Coal. <br />Conl Volune- -~Bottorh of <br />PREMINING MATERIAL VOLUME DETERMINATI^N Coal <br />^riginnl Ground <br />Estinnted Postnln~ng Surface <br />Lnnd Forts Surfnce t <br />__ <br />erior <br />mine <br />)Oil <br />•rial <br />.une <br />Disturbnnce Aren Boundary <br />P^STMINING MATERIAL VOLUME DETERMINATION <br />Postmining Topography <br />Typical Mass <br />Balance Illustration <br />x er~oi <br />-- - ^v rpurde <br />~-- Mnterl l Volune <br />~ntewor Postnining Spoil Material Volun <br /> <br />• <br />