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Non-recovered Coal and Parting Material Volume. This is the difference between the recoverable coal <br />volume and the total in-place coal volume. <br />Premining Overburden Volume. If there is non-recovered coal, then it stays within the pit area. Therefore, <br />this material is added to the virgin overburden to determine the premining overburden volume. <br />Total Pit Spoil Volume. The premining overburden volume is then multiplied by the swell factor 11.153) to <br />determine the total pit spoil volume. The 15.3 percent swell was used in determining postmine topography <br />at the Seneca II Mine. Materials are similar at Seneca II-Wand, therefore, the 15.3 percent swell was also <br />used for this exercise. However for PRO3 (Sage CreeklWolf Creek) mining area, SCC has determined that <br />a swell factor of 1.17 is more applicable. <br />5 Revised 01/02 <br />