2001-12-07_REVISION - M1983067 (32)

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~nks and Gesso, LLC FJCHIBIT D: Mining Plan Overview The Applicant proposes to develop the site for mining and processing of sand and gravel. Approximately 32.5 acres of the total permit area of approximately 52 acres is proposed for mining (see Exhibit C-3, Mining Plan Map). After mining is complete, the excavated area will be reclaimed as awater-storage reservoir surrounded by an engineered, im ermeable bentonite slur wall that will be constructed arior to mining operations below aroun water eve s. e e des o establishing itself. gradually The post-mining land use of the property is for water storage and wildlife habitat. Mining Methods -Rule 6.4.4(a) ,//~ The Applicant proposes to dry-mine the property. Initial mining will occur in the '0 northern portion of the property and progress southward. Initial mining operations will include stripping of topsoil and construction of a tailings pond at the southern end of the property. A slurry trench will be constructed around the perimeter of the property prior to commencement of mining operations below ' existing groundwater levels. The slurry wall will be located approximately at a 50 a foot offset from the center line of Brighton Road on the east, and at an offset of /~ approximately 35 feet from the property line in other areas. Depiction of the ~„q` slurry wall on the plans herein is based on field locations and may change ~ ~ according to field conditions. In order to reduce the cost of slurry wall installation, the Applicant proposes to excavate material across the site to an elevation of 5010 feet. This is approximately 10 feet below the highest point on the property, but still approximately 5 feet above existing groundwater levels. The top of cut for this aor ~ excavation will be located approximately 40 feet from the center line of Brighton Road on the east, and approximately 25 feet from the property line in other `~ areas. Once an excavation elevation of 5010 feet is reached, slurry wall construction will begin along the perimeter of the permit area. Upon completion of slurry wall construction, the Applicant will backfill to original grade to a point approximately 20 feet offset of the slurry wall. At this point mining will commence ~ below groundwater at a near vertical slope, with reclaimed reservoir wall ' backfilled to a minimum 3:1 slope. Raw material will be excavated with front~end loaders, excavators, and tractors. The material may be loaded on a field conveyor in the mining area and conveyed back to the processing area, or some materials may be excavated with scrapers or off-road haul trucks. Shale material may be pushed up with a bulldozer for subsequent handling with the front-end loaders. Conditional upon a completed Stapecoech Mine -Regular 112 derma 01045 Mobile Rernh Concrete Ina 6 November, 2001