2003-11-06_REVISION - M1987024 - Laserfiche WebLink

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Corey Pit No. 3 DMG 112 Permit Conversion Application EXHIBTT D - Minine Plan Reclamation will begin on the north end of the existing pit as mining proceeds far enough to the south so that reclamation will not interfere with ongoing mining operation. The haul road will remain running north and south through the center of the existing pit. The operator has a continuous mazket for the gravel and anticipates removing material on an intermittent but year round basis. Annual production is expected to be about 150,000 tons, but will vary as local demand varies. Processing equipment will be on site for approximately 30 day intervals, two to three times a year to replenish stockpiles of processed material as needed. The pit walls on the west and east will be day-lighted in the vicinity of the existing pit where the landowner's property covers the entire depth of gravel. The east side of the expanded pit will be left as a ridge that follows the level of the existing farm road to the top of the mesa. The west side of the expanded area will be left as a ridge at the current elevation of the mesa. The high- walls on the east and west side of the pit will be reduced to 3:1 (h:v) slopes using cut and fill technique as soon as practical after mining has progressed south faz enough that sloping will not interfere with ongoing operations. The south side of the expanded pit area will be sloped at 3: I (h:v) from a point 25 feet inside the permit boundary when mining is completed. Overbwden and topsoil will be replaced on slopes and the floor after final grading is done. The estimated average depth of the gravel seam is 40 feet. Gravel will be excavated to within about two feet of the underlying shale and to within 85 feet of the permitted boundary on the south and west sides. There will be no excavation or stockpiling within 30 feet of any adjacent property boundary. The operator will reduce high-walls in the mined out area of the pit so that no more than 800 feet of un-sloped high-walls will be present at any one time. The maximum high-wall height will be 25 feet. Dozers will be used to push material down the slope so that high-walls greater than 25 feet will not be created. Final reclamation will begin when all the gravel is removed from the entire affected azea. The following narrative addresses the itemized requirements of Section 6.4.4 of the Rules a) Gravel will be mined using front-end loaders, dozers and/or excavators. b) Topsoil and overbwden will be removed from the gravel deposit using scrapers, dozers or front-end loaders and stockpiled on the east side of the existing pit floor and on the east and west sides of the expanded pit azea on top of the mesa. High-walls will be reduced using cut and fill technique and dozers. Topsoil and overbwden will be replaced using dozers and scrapers. c) The only water we anticipate encountering is water from an existing seep along the gravellshale interface in the southwest comer of the existing pit primarily during the summer irrigation season. A ditch around the base of the high-wall may be needed to direct any Stormwater runoff or seepage to the southwest corner of the existing pit where it will dischazge into an existing drainage in the gulch west of the property. Straw bales or silt fencing will be used to enswe that only clean water leaves the affected lands. d) We anticipate having no more than 20 acres of un-graded distwbed area at any one time. We will have no more than 800 feet of high-wall that would need to be sloped at any one time. Partial sloping of the east and west interior walls will be done concurrently with the ongoing mining operation.