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rILURE 27-i <br />Mine Aren Boundary <br />V~rg~n Overburden Volune <br />• <br />Or~g~nnl <br />round <br />Surface <br />op of Conl <br />Coal Volune-' _~Bottor+ of <br />PREMINING MATERIAL VOLUME DETERMINATION Conl <br />Est~nated Postn~n~ng <br />Land Forn SurfnCe <br />Exterior <br />S tl'line <br />Spoil <br />Mnter~al <br />Volune <br />Disturbance Aren Boundary <br />POSTMINING MATERIAL VOLUME DETERMINATION <br />Postmining Tooography <br />typical Mass <br />Balance Illustration <br />pr~g~nal Ground <br />Surface <br />_ _ ~ xter~or <br />_ -- pv rburden <br />Mnter~ l Volune <br />~nter~or Postn~rnng Spoil Mnter~al Volun <br />• <br />