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The efficiency of the mining operations can be measured by the number of tons of coal produced per <br />acre foot (TPAFI. Based on drill hole data regarding seam thickness, coal partings, and extent and <br />laboratory analysis of specific gravity 11.301, in-place reserves are estimated to be 1,762 tons per acre <br />foot. Actual production will be calculated monthly using scale measurements and stockpile <br />fluctuations. This production would be defined through the use of monthly aerial or engineering <br />surveys to an area where coal was actually removed to produce the TPAF recovered for each month. <br />The historical average recovery for the Seneca II~W mine is approximately 93.6 percent. Mined <br />tonnage is, therefore, estimated at 1,650 TPAF. This recovery is well within industry standards (Wood, <br />19831. <br />Although uncommon at the Seneca 11-W Mine, coal fires may occur in the mined cut and spoil, coal <br />handling facilities, or reclaimed highwalls. It is in SCC's best interest to control fires and prevent loss <br />of coal resource. Burning coal in these areas will be extinguished by removing and mixing the material <br />with noncombustible material to the extent practicable and burial with at least four feet of <br />noncombustible material, if appropriate. Water may be utilized in the coal handling facilities. <br />When exposed coal seams occur in the lower portion of the final highwall, backtilt material at the seam <br />locations will be of noncombustible material placed in a manner to provide at least four feet of <br />covering. Reclaimed highwalls shall be monitored visually on a quarterly basis to identify any evidence <br />of burning coal. Should evidence indicate coal seams are burning, SCC shall excavate, extinguish and .• <br />backfill to the extent practicable, the burning portion of the coal seam. ~ ~ - <br />• <br />10 Revised 04/00 <br />