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• to the northern boundary of the present lease, and the <br />northern panels are under development. <br />The development of the present lease is indicated on <br />Plate 10 that shows the long-term mine plan. for the future <br />lease. <br />9.3 MINE EXPAIJSION <br />Details of future mine plans are constantly being <br />changed. Plans for future mining presented in this report <br />should be considered to be representative and typical rather <br />than final. In general, future development is envisioned as <br />a scheme of pillar panels accessed by a system of main and <br />submain entryways, with eventual pillar recovery from the <br />entryways and chain-barrier pillars. <br />A plan for the expanded mine within the <br />has been prepared by CWI and made available <br />of this subsidence study. The plan is titled <br />Planning" and dated 12/09/1982. This m <br />simplified for the purpose of our study and <br />Plate 10, Underground Development Scheme. <br />long-term lease <br />for the purpose <br />"Long-Term Mine <br />fining plan was <br />is presented as <br />• The entries into the mine are by two mains, one in the <br />north-south (or north northeast - south southwest) direction <br />and two entries in the east-west direction, perpendicular to <br />the north-south entries. The north-south mains are called <br />1st North Mains. Two east-west entries are termed West I <br />Main and West II Main. <br />The 1st North Mains comprise a safety pillar 180 feet <br />wide and two sets of entries, one on either side of the <br />safety pillar. There are four entries on the west side of <br />the safety pillar and five entries on the east side of the <br />safety pillar. Adjoining the entries are additional pillars <br />separating the entries from the mine panels. These pillars <br />are about 380 feet wide on both sides of the 1st North <br />Mains. <br />The ee.st-west mains have a similar arrangement. There <br />are two systems of entries on either side of the central <br />safety pillar: Tfie west I Main is located north of the <br />safety pillar; a Troup of mine panels A through Z <br />immediately adjoins the (Jest I Plain on the north side, <br />without a safety pillar between the mains and the panels. <br />The group of southwest panels south of the Id=st II Main is <br />separated Erom it by a pillar 380 feet wide. <br />• - 21 - <br />