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IMC-2 Quarry <br /> Area: 1.79 acres. <br /> This is a pre-law quarry which has not disturbed by extraction under this permit. Under this revision we <br /> have delineated this old quarry for possible future mining. If mining is carried out there, we will remove <br /> material on the north, west,and south walls so as to create 3:1 slopes. Alternatively,we may extend <br /> the mining of the north wall to join the south wall of the adjacent Ruby Pit (and mine out any remaining <br /> ridge between the two areas). Under either scenario, the final pit floor of this area will be at the same <br /> elevation as the(permanent) Road 383B. <br /> IMC-3 Quarry <br /> Area: 1.62 acres. <br /> This is a pre-law quarry which the operator has no plans to mine in the future. The quarry is currently <br /> being backfilled with crushed %-minus material that is generated onsite. It is difficult to estimate how <br /> long backfilling may need to continue since it only occurs as materials become available. When <br /> backfilling is complete,this area will be sloped,and final reclamation will begin. <br /> MQD-1 Dump (West Dump) <br /> Area: 6.39 acres. <br /> This is an old dump from previous mining, in the southwest corner of the permit. It has been used for a <br /> stockpile area for crusher fines. Most formerly-existing dump materials and stockpiles have been <br /> crushed and removed. <br /> When the last of the remaining fines have been removed (and used as growth medium in areas being <br /> reclaimed) it will be ready for final reclamation grading, particularly the dump outslopes on the western <br /> end, and interior slopes against the northern side. A small portion in the eastern end of the area will <br /> continue to be used for access to the Mica Pit highwalls. <br /> The permanent road along the south edge will continue to be used throughout the reclamation stage. <br /> MQHW-1 (West Highwall) <br /> Area: 5.09 acres. <br /> This area consists of the western portion of the Mica Pit, and the west half of the Mica Pit floor(referred <br /> to elsewhere in permit documents as the Pit Lake). This area contains the notably high,steep hill of <br /> outcropping rock that is being removed in this permit;estimated to be approximately 120 feet above <br /> the present pond level. <br /> The highwalls on the southwest,west, and northwest sides of the pit have been created by drilling and <br /> blasting over many years. Those faces consist of rough walls and benches, but are presently steeper <br /> than the final reclamation gradient. Further extraction by drilling and blasting will be required to attain <br /> proper configuration. Final slope configuration (for stability and MSHA requirements)will be 40-foot tall <br /> 1.25:1 walls, alternating with 25-foot wide,gently-sloping benches. It will take a number of years to <br /> fully complete this highwall, since it is mined only in response to demand. <br /> Material to be blasted down from the west highwall into the pit may be sold and removed from the pit, <br /> or may be left as backfill in the bottom of the pit,to transition from highwall to floor. Backfilling on the <br /> floor and benches can be done at toe of slopes with waste rock and fines to flatten wall slopes and <br /> create gentle sloping bench areas on the west highwall and pit floor. <br /> If the Pit Lake remains as a permanent feature, its total surface will be 0.7 acres or less. <br /> Topsoil or growth medium will be placed on upper benches on West highwall area. <br />