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PROJECTED MATERIAL BALANCE <br />STAGES 1 THROUGH 4 <br />BOURG STRIP MINE <br /> Swollen Swollen <br /> Coal Produced Overburden Total Pit Overburden Vol. Overburden Vol. <br />Stage Tonnage Vo ume BCY * Volume(BCY) Volume(yd3) Assuming 10% Assuming 20% <br />1 150,000 139,500 583,800 723,300 642,180 700,560 <br />2 150,000 139,500 513,000 652,500 564,300 615,600 <br />3 150,000 139,500 535,900 675,400 589,490 643,080 <br />4 150,000 139,500 735,900 875,400 809,490 883,080 <br />TOTAL: 600,000 558,000 yd3 2,368,600 2,926,600 yd 2,605,460 yd3 2,842,320 yd3 <br /> Total Pit Volume = 1.236 Therefore, an inherent overburden swell factor <br /> ota Overbur en would be necessary to achieve approximate <br /> Volume (BCY) original contour of the backfi lled pit. <br />(* Coal Volume calculations asume Caterpillar Handbook in-place coal density for <br />Bituminous Coal of 2150 pounds/cubic yard) <br />/mt <br />Doc. No. 341 <br />