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• 2.05.6(6) <br />have been adopted for the new B -Seam mine plan. The barrier pillar <br />is shown on Map 9A. The split pillar zone with 708 extraction is <br />incorporated into the mine recovery sequence for all pillar areas. <br />The 1989 GW report was a multi -seam subsidence study that did not <br />make any specific mine plan recommendations. The orientation of <br />the panels in the GW report was designed to columnize the pillars <br />and panels in the C and B- Seams. <br />n <br />U <br />• <br />The new mine plan incorporates two additional techniques to <br />minimize subsidence caused surface disturbance. The first is the <br />110 -foot minimum overburden boundary to protect against chimney <br />subsidence. The second is the 508 extraction limit in the vicinity <br />of Lone Pine Gulch to protect the gulch and springs CR -12 and G- <br />26A. The Mine Plan Map (Map 9A) shows the restricted mining areas <br />where the 110 -foot overburden boundary and 508 extraction limit <br />areas are located. <br />2.05 -63a Rev. 04 -20 -94 <br />