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u <br />Total Material Moved to Fi11 Area 168,315 Yds3 <br />Coal Mined Out 29,359 Yds3 <br />Overburden Backfilled in Mining Area by Dozers 29,359* Yds3 <br />Increase in Volume of total Area 224,253 Yds3 <br />(Total Increase in Volume - (Total Overburden Excavated) <br />Total Overburden Excavated <br />224,253-168,325/168.315 <br />55,938/168,315 - .33 or 33% <br />* Dozer yardage estimated by hour usage and by observation of pit <br />refill. For purposes of these calculations, yardage backfilled is <br />assumed to equal exactly the volume of coal mined. <br />