Laserfiche WebLink
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 is currently being backfilled and is in the reclamation process. <br />Kimber Pit Mining Area <br />The October 2006 landslide in the East Panel of Trapper Mine resulted in a dramatic change in planned <br />mining methods at the mine. The K Pit and L Pit (f.k.a. G Pit) were originally planned as dragline pits, <br />consistent with Trapper's historic mining method. After extensive geotechnical study and mine planning <br />efforts, it has been determined that dragline mining is not a viable mining method for the K Pit due to the <br />steeply dipping structure. <br />After the East Panel landslide, Trapper retained Agapito Associates, Inc. (AAI) to perform geotechnical <br />investigation of the area to determine the causes and ramifications of the event. Numerous studies and <br />evaluations were performed by AAI personnel. A detailed analysis of AAI's findings is available in AAI's <br />January 2008 report, "Trapper G -Pit Landslide Mining Assessment" found in Appendix T. <br />K Pit is mined with both a truck/loader fleet and draglines. The western portion of the pit is mined in a <br />strikeline orientation. The truck/loader fleet strips the overburden from the upper coal seams (to L seam) <br />ahead of the dragline operations. Seams M, Q, and R are exposed with the dragline operation. <br />The eastern portion of K Pit is mined in a dipline orientation with the truck/loader fleet continuing to <br />uncover the upper coals to L seam ahead of the draglines, and the dragline operations exposing M, Q, <br />and R seams. <br />Due to the steeply dipping pit floors, the initial overburden removed from K Pit was placed in the Horse <br />Gulch Fill and as final pit backfill in Flintlock pit. In addition to this fill, spoil has been placed as a buttress <br />to the north of K pit, in accordance with the recommendations of AAI. Upon completion of mining, the K <br />Pit will be backfilled to achieve PMT, as depicted on the M12 map. <br />L Pit (f.k.a. G Pit) Mining Area <br />L pit has been designed as a strikeline and dipline dragline pit over the years. L pit currently occupies the <br />eastern portion of the east panel landslide mass. Development of this pit will occur as mining progresses <br />from the K Pit, and will utilize a combination of truck and loader stripping and dragline stripping (in a <br />dipline orientation). <br />Hawken Pit Mining Area <br />Mining in Hawken pit (H -pit) was completed in April 1997. After performing reclamation activities, the <br />Queen Anne dragline walked to Ashmore pit in May 1997. <br />Ithaca Pit Mining Area <br />There is no mining scheduled for Ithaca pit (1 -pit) during the 2013 -2017 permit term. This area was <br />originally projected to affect previously disturbed and reclaimed but unmined land. It was to be located on <br />the northern fringes of the old Ashmore pit located in the Coyote and No -Name watersheds. Future <br />development of this area is currently under consideration. <br />3 -15a �+ <br />