Laserfiche WebLink
MINING PLAN <br />The gravel zone is approximately 30 feet thick in a alluvial deposit and is overlain by soil and <br />overburden of 1-6 feet. The area will be mined by first excavating soiVoverburden with front <br />end loaders or dozers and stockpiling the material in separate piles. The raw gravel material will <br />then be loaded with a loader into a portable crusher/screen plant where various sizes of product <br />will be made and placed in separate stockpiles. Dozers may also be used to move <br />topsoil/overburden or gravel. Current mining limits can be seen in Map C-1. The buffer <br />between Amendment # 1 and Amendment #2 has been removed. This will be replaced with <br />compacted fill as part of the reclamation. The replacement of the buffer is described in the <br />Reclamation Plan. Future mining will take place in Amendment # 2 and then move into the new <br />Amendment #3 azea. The mining of the deposit will occur to the limits shown on Map C-2 and <br />will be mined at a O.SH:1 V slope. This slope will then be backfilled as per the Reclamation <br />Plan. <br />Due to excavation below the local water table the pit must be dewatered. Currently, the pit is <br />being dewatered through the use of trenches and pumps. The trench bottoms are approximately <br />2' below the pit bottom. These trenches drain the water to two pumps. The pump along the west <br />edge of Amendment # 1 pumps a majority of the pit's water into the original pit. This pit acts as <br />the sediment pond with the final discharge being the northwest corner of the pond. A second <br />pump is used to supply water to the residences to the east. The dewatering of the pond has <br />drawn the water table down in the immediately adjacent land. This lowering of the water table <br />has effected the irrigation wells used by the residences within 500' of the pit. This effect has <br />been mitigated through the use of a pump within the pit supplying water to the residences for the <br />watering of lawns and landscaping. Once the pit is allowed to fill with water the shallow wells <br />of the residences will again be used to supply their own water. <br />Storm water for the site will be contained within the pit. All disturbed areas within the permit <br />area will be isolated from the surrounding terrain. This is accomplished by isolation berms, <br />large stockpile berms and isolation ditches. <br />It is extremely unlikely that any toxic or acid-producing materials will be encountered during the <br />mining operation since the past mining shows that the material is alluvial in nature. However, in <br />the event that such materials are encountered, they will be covered with subsoil and topsoil from <br />the stockpiles to the same depths outlined in the reclamation plan and no more mining will occur <br />in this area. The operator commits to cleazly mazking the permit boundary with stakes surveyed <br />on site. No blasting will occur on this site. If any "reportable quantity" of hazardous material or <br />waste is released into the environment, the operator will notify staff of the Colorado Division of <br />Minerals and Geology as well as all other appropriate local, state and federal agencies. <br />Pit No. 1 1/04 <br />.c.~_ t <br />JAM 1 ~ 2004 <br />~pQ~,JWgy~i•N .5 r.+~ <br />~j(y'vit...:.J~ r ... ... ~~ <br />