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<br />Section 780.18(b) Continued. <br />Revised 04/20/90 <br />burden that must be removed and stored or replaced outside of the <br />active mining area to accommodate the open pit is approximately <br />8,200,000 bank cubic yards. <br />By observing Figure 33, Typical Steady State Pit, it can be seen that <br />the area where active mining takes place is more than 3,000 linear <br />feet in advance of final backfilling, topsoiling and revegetation. <br />As depicted on Map 1, Kerr Mine Area Mine Plan, and Map 33, Kerr Mine <br />Area Overburden Replacement and Grading, mining and backfilling <br />advance at approximately the same rate once pit development is <br />completed and steady state operations are established. During <br />certain periods overburden replacement may advance more rapidly as <br />final pits are backfilled. For these reasons final reclamation must <br />`~ lag behind active mining for approximately three years. Initial <br />backfilling, for example covering of the exposed coal seam in the pit <br />bottom, will occur within 180 days of final coal removal; but because <br />of the nature of the mining plan as described above, the approximate <br />original contour cannot be achieved until approximately three years <br />after the coal has been removed. Further discussion regarding <br />overburden volumes, pit length and size can be found under Section <br />780.11. Overburden volume calculations are presented in Exhibit 50, <br />Overburden Volume Calculations. <br />Soil will be removed prior to mining disturbance in accordance with <br />the timetable established on Map 31a, Kerr Mine Area Soil Removal and <br />Storage; and salvaged topsoil and subsoil will be reapplied in <br />accordance with the timetable depicted on Map 32, Topsoil Replacement <br />and Revegetation. <br />780-62 as <br />