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• TABLE 20-1
<br />POST MINING LANDFORM MASS BALANCE
<br /> Areal Area 2
<br />Pre-Mining Pit Material Volume Calculations
<br />Pre-Mining Material Volume 12,404,306 bcy 31,738,823 bcy
<br />Virgin Overburden Material Volume 9,623,200 bcy 27,087,354 bcy
<br />Total In-place Coal Volume 2,781,106 bcy 4,651,469 bcy
<br />Recoverable Coal Volume 2,526,900 bcy 4,186,322 bcy
<br />Non-recovered Coal and Parting Material Volume 254,206 bcy 456,147 bcy
<br />Pre-Mining Overburden Volume 9,877,406 bcy 27,552,501 bcy
<br />Total Pit Spoil Volume 11,062,694 Icy 30,858,801 Icy
<br />Pre-Mining Material Mass Volume:
<br />Total Pit Spoil Volume 11,062,694 Icy 30,858,801 Icy
<br />Total Pre-Mining Material Volume 12,404,306 bcy 31,738,823 bcy
<br />•
<br />Post Mining Material Volume Calculations
<br />Post Mining Spoil Material Calculated:
<br />Post Mining Spoil Material Volume (Internal) 9,967,208 cy 31,502,979 cy
<br />Post Mining Spoil Material Volume IExternall 186,012 cy -
<br />Total Post Mining Spoil Volume 10,153,220 cy 31,502,979cy
<br />Post Mining-Overburden-Material-Excavated - - - --- ------- --- --- - __-__
<br />Pre-Mining Total Pit Spoil Volume 11,062,695 cy 30,858,801 cy
<br />Post Mining Overburden Material IExternall 99.612 cy --
<br />Total Overburden Material Excavated (Swelled) 11,162,577 cy 30,858,801 cy
<br />Post Mining Material Volume Comparison
<br />Total Post Mining Spoil Volume 10,153,220 cy
<br />Total Overburden Material Excavated 11,162,577 cy
<br />Volume Difference 1,009,357 cy
<br />u
<br />31,502,979 cy
<br />30,858,801 cy
<br />644,178 cy
<br />4 Revised 2/99
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