Laserfiche WebLink
r 1 <br />L_J <br />• <br />lfjdralope Okra huopa"rion and lmpaer A.tr®nat for rht Pamir mrdAdjacau Azar <br />Southwest Main Intakes (Exhibit II). Development <br />progressed to crosscut 12 before loose root condi- <br />tions precluded further advancement <br />The 1 Northwest Submain was retreat mined to <br />crostcvt 3 during 1991. The pillars inby crosscut 10 <br />were left intact for the ventilation bleeder stability. <br />The area remained wet, but had no measurable <br />inflow. <br />2 Northwest Submain <br />MCC tried developing the 2 Northwest Submain to <br />the northwest oll the NW1S panel. Development <br />reached 11 crosscuts before mining conditions <br />deteriorated. This Submain waz then retreat mined <br />leaving a row of halt-pillars along the north side to <br />protect the 1 Northwest Submain ventilation <br />bleeder. <br />Panel NW1S <br />During 1990, MCC began developing this panel to <br />the southwest from the Northwest Submains. In <br />1991, this development continued 21 crosscuts to <br />the southwest The panel was then completely <br />retreat mined in 1991. <br />"B" Seam <br />MCC completed development of the "B" seam <br />access and ventilation raise during 1991. Develop- <br />ment of the B West Mains was completed two <br />crosscuts east and seven crosscuts west of the <br />ventilation raise site. <br />As previously described, small quantities o[ cater <br />(< 1 GPM)wereencounteredduringdevelopment <br />mining is 1991. The water waz issuing frorc he <br />roof, rib, and floor. Because dripping and W _, <br />inflow generally subsided within 24 hours, :.._ <br />water appears to be contained within fractures and <br />found in association with root joints, minor fault, <br />or rock spars. Areaz of damp top persisted locally <br />along the more pronounced Erasure trends. <br />Water inflows were greatest along the more highly <br />frasured zones. Initial water inflows were estimat- <br />ed azhigh az 20 gpm. After (rasures were dewa- <br />tered, inflows dropped substantially. However, a <br />few loptions continued to produce water at an <br />estimated 1 to 3 gpm (Exhibit III). No seasonal <br />variation in flows waz observed. <br />Mining Activities Planned for 1992 <br />Water conditions in this panel were similar to <br />those encountered in the 1 Northwest Submain. <br />Most of the developed area was wet However, <br />none of the inflows were measurable. <br />Panel NW2S <br />This panel was developed off the 2 Notthwest <br />Submain. However, mining progressed only 3 <br />crosscuts before mining conditions once again <br />deteriorated The panel waz completely retreat <br />mined during 1991. No measurable in-mine flows <br />were observed. <br />Planned Mining Activities for 1992 <br />MCC plans no mining in the "F" seam during <br />1992 All mining ef[orts will be focused on the "B" <br />seam. <br />During 1992, MCC plans begin longwall mining <br />and continue developing the B West Mains and <br />longwall panels. Development of the 1st longwall <br />panel will be completed and development of the <br />2nd longwall panel will begin. MCC will also begin <br />retreat longwall mining the 1st longwall panel. <br />Development of the B West Mains will continue to <br />the west to the 2nd longwall panel (Exhibit III). <br />Water Quality <br />Samples taken during 1991 indipte water quality <br />in the mine to be good. Accordingly, it should pose <br />no problem for discharge. The discharges should <br />readily meet NPDES effluent limitations after <br />settling and should not measurably impact receiv- <br />ing waters. Quality of water discharged in 1992 <br />should be similar to the 1991 values shown in <br />Table 5. <br />• it <br />