Laserfiche WebLink
rvsdpgsMarch2020 <br /> Presently seven main seams are recovered. They are the "H", "I", "K", "L", "M", "Q" and "R" seams. Later, <br /> other seams may be recovered. When practicable, any rider seams are also recovered. (Refer to Section <br /> 2.7.1 for a more detailed discussion of the coal seams recovered.) <br /> In some cases, pit dewatering of open cuts will be performed using portable pumps. In addition,dewatering <br /> wells may be installed at the north end of the pit cuts or south above the pit cuts and in front of the advancing <br /> active mining area. The wells are constructed no more than ten feet below the lowest mineable coal seam <br /> and may be pumped prior to the beginning of actively"opening up"the area. Appropriate well permits have <br /> been filed(Section 2.7.5.4)and provide Trapper the legal right to construct and pump these wells. Appropri- <br /> ate records are kept concerning the volume of water pumped from the open pit cuts and drilled wells. <br /> The mining methods employed at the Trapper Mine effectively conserve and utilize the coal resource. Coal <br /> is recovered to the maximum depth that present equipment and economic limits will allow. This endeavor <br /> minimizes the possibility of re-mining the area by surface methods and results in a program that maximizes <br /> coal recovery and minimizes surface disturbance. <br /> 3.1.4.1 Mining Sequence <br /> Ashmore Pit Mining Area <br /> Mining in Ashmore pit (A pit) was completed in 1999. After performing reclamation activities, the Queen <br /> Anne dragline walked to Ashmore East pit. <br /> Ashmore East Pit Mining Area <br /> The Queen Anne dragline was the primary stripping machine for this area until 2003. The Baby Doe <br /> dragline conducted stripping in this area in 2006 and early 2007. As this pit is tied closely to the L Pit <br /> advance, it is now incorporated into L Pit, hence will no longer be called Ashmore East Pit Mining Area. <br /> Derringer/Enfield Pit Mining Area <br /> This area located in No Name drainage is permitted as a future ash disposal site. With the exception of <br /> developing a small area on the north end of this pit, Derringer/Enfield pit (D/E-pit)will remain idle <br /> (temporarily abandoned) until ash disposal operations begin Final reclamation in Derringer/Enfield Pit <br /> will occur when its ash disposal capacity is used up (sometime after the 2018-2022 permit term). See <br /> Section 3.5.5 for a description of temporary abandonment. <br /> East Flintlock (also known as Z) Pit Mining Area <br /> East Flintlock (Z) pit is located in the East Pyeatt, Oak, West Flume, Middle Flume and Horse drainages. <br /> Previous cuts in this pit were dug by the Molly Brown and were strikeline pits located primarily in the East <br /> Pyeatt and Oak drainages. The Molly Brown completed these strike line cuts as well as a series of dip line <br /> cuts advancing to the east during the 2008-2012 permit term. East Flintlock Pit has been backfilled and <br /> reclaimed. <br /> Flintlock Pit Mining Area <br /> The Baby Doe and Queen Anne draglines were the primary stripping machines for this area. Located in <br /> the East Pyeatt drainage, mining in these F-pit dip line cuts was completed during the 2008-2012 permit <br /> term. Flintlock Pit has been backfilled and reclaimed. <br /> 3-15 <br />