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• 9. Should the active hole being angered intersect the previous hole. the auger will pull <br />out immediately at that point, skip [he next adjacent hole and then go on to angering <br />again. <br />• <br />• <br />10. Auger holes shall be blocked with highwall spoil or other suitable material before they <br />are abandoned. A maximum of 15 previously angered holes will be left open for visual <br />monitoring of any pinching or squeezing of [he web pillars. <br />Production <br />SCC has estimated the following production and recovery for the auger mining operations: <br />Average Coal Thickness: 11 feet <br />Coal Recovery: 1650 Tone/Acre-foot <br />Depth of Block: 600 feet <br />TOn9 Pei Angel Hole (BO pounds/cubic foot}; <br />600 Feet = 678.6 Tons <br /> Block A Block B Block C <br />Block Width 900 ft 1800 ft 2700 ft <br />Pillar S acin /Hole 5.0 5.0 5.0 <br />Number of Holes/Block 82 164 246 <br />Tonnage 55,645.2 111,290.4 166,935.6 <br />Recovery Rate 24.78 24.78 24.7b <br />References Cited <br />Auger Panel Design Study for Seneca II-W and Yoaet Mines, Seneca Coal Company prepared by <br />Mr. Graeme Boyd, Highwall Mining Services, Inc. of Brisbane, Australia, September 1998. <br />12-1-5 Revised 01/01 <br />