Laserfiche WebLink
• <br />r1 <br />LJ <br />tl~drotoge Dhra buapraadon and hnpacr Maoneu fo the PemW m~E Adjacw,bear <br />Southwest Main Intakes (l5thtbit II). Development <br />progressed to crosscut 12 before loose roof condi- <br />tions precluded [uriher advancement. <br />The 1 Northwest Submain was retreat mined to <br />aosscut 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 Norihwest Submain to <br />the northwest off the NW1S panel. Development <br />reached 11 crosscuts before mining conditions <br />deteriorated. This Submain was then retreat mined <br />leaving arow ofhalf-pillars along the north side to <br />protect the 1 Northwest Submaia 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 />atxest and ventilation raise doting 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 of water <br />(< 1 GPM)wereencounteredduringdevelopnent <br />mining in 1991. The water was issuing frotr ~e <br />roof, rib, and floor. Because dripping and W .: <br />inflow generalty subsided within 24 hours, .. <br />water appears to be contained within fractures and <br />found in association with roof joinu, minor faults, <br />or rock spars. Areas of damp top persisted locally <br />along the more pronounced fracture trends. <br />Water inflows were greatest along the more highly <br />fractured canes. Initial water inflows were estimab <br />ed as high as 20 gpm. After fractures were dewa- <br />tered, inflows dropped substantially. However, a <br />[ew locations continued to produce water at an <br />estimated 1 to 3 gpm (Exhibit III). No seasonal <br />variation in flows was 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 Z Northwest <br />Submain. However, mining progressed only 3 <br />crosscuu before mining conditions once again <br />deteriorated. The panel was 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 "1=' seam during <br />1992. All mining e[fons will be focused on the "B" <br />seam. <br />During 1992, MCC plans begin iongwatl 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 oC 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 (F_xltibit III). <br />Water Quality <br />Samples taken during 1991 indicate 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 />• 11 <br />