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• In addition to the mains, there are several submains <br />that are generally perpendicular to the mains with the <br />exception of the submains within the existing mine which are <br />angled at about 90 degrees to the axis of the mains. They <br />are divided into a group of the four south submains in the <br />southwest part of the mine, three submains in the northwest <br />p.=.rt of the mine, and four submains in the east part of the <br />mine (submains of the existing mine have not been taken into <br />account). The submains are generally 350 feet wide, and on <br />one side they are separated from the mine panels by a <br />protective pillar 200 feet or more wide. <br />At several locations, the mining scheme has been <br />adapted to the faults which have been encountered during the <br />mining operation, or to the faults that are expected to <br />occur within the new lease. <br />The mine panels and barrier (or chain) pillars between <br />them Nave been designed on a fairly uniform scheme. The <br />width of the mine panels is 400 feet and the barrier pillars <br />between them are 60 feet wide. The length of the mine panels <br />varies considerably within the mine. In the southwest group <br />of panels the maximum length of a Hanel is 2,500 feet. <br />Shorter panels have been designed at the west end of the <br />mine where the panels reach the west boundary of the lease. <br />• Shorter panels also have been designed in the east part of <br />the southwest group of panels. <br />A different panel length has been designed within the <br />northwest group of panels (panels A through C), where the <br />north end of the proposed panel is limited by the lease <br />boun~7ary or by the limit of mineable coal. The shortest <br />panel within this group is about 2,500 feet long while the <br />longest panel reaches the a length of about 4,900 feet. In <br />the east group of panels, the panel length varies between <br />about 1,000 feet and 2,500 feet. <br />The limits of the proposed long-term lease mine vary at <br />different locations around the perimeter of the lease area. <br />On tie west side, limits of proposed mining coincide close]y <br />with the proposed lease limit. On the north side of the <br />lease, mining is planned to the lease limits only where an <br />economically viable coal thickness is expected. A major <br />portion of the lease in its northwest corner does not appear <br />to be mineable because of the split of the D-coal seam and <br />its decreasing thickness. On the east side of the lease, <br />proposed mining limits coincide closely with the lease <br />boundary except for the mined-out area of the old Farmers <br />Mine. <br />• - 'v - <br />