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The first permit renewal was granted in May of 1988 and the second was granted June 3, 1993. During the period <br />of 1993 through November 1999, the Division has approved permit revisions 2 (see Mining District), 3, and 4 <br />(Eastern Mining District). <br />The mining activities envisioned by the first permit, issued in 1983, was strictly for room and pillar mining. The <br />approval by Twentymile Management for a longwall resulted in a change in mining method in 1989. Prior to that <br />time development work was commenced which saw the development of the North Mains and subsequent gateroad <br />development for the west side of the mine (panels 1 through 6). These panels were all mined up dip. The mining <br />of these panels was completed in 1994. <br />The next district, which TCC mined was known as the Southwest Mining District, and longwall coal was produced <br />form this district from 1994 into 1996. Panels ls` SW to 3`d SW were mined from this district. <br />In 1996, TCC began longwalling coal from the Eastern Mining District. The name reflects the fact that this district <br />is located to the east of the North Mains. The Eastern Mining District is comprised of longwall panels 9 Right <br />through 2 Right. It is anticipated that mining of the 2 Right panel will be completed in 2000. Upon completion of <br />mining in the Eastern Mining District, TCC plans to move into the Northern Mining District. The Northern Mining <br />District is the subject of permit revision 5, which is pending regulatory approval. <br />A survey of the area overlying the planned mining has identified the following structures, resource features, and <br />facilities that could be affected by potential subsidence. <br />A,F ,; '2D- APR 2 4 20010 <br />Permit Renewal No. 3 2.05 -172.1 l 1/l/99 <br />