2002-08-23_REVISION - M1983033 - Laserfiche WebLink

Home Browse Search

MINING PLAN (CONT) rmmn® AetuL 2001 ExNlerr D hillside as mining moved into the northwest corner. The elevation of this area will not be mined to its final level initially, but rather will be mined to the level of the adjoining floor and later lowered to its final elevation as mining progress. Once the face is removed mining would then begin to the northwest towards the northwest corner of the mine and the north- south face could then be gradually oriented so it is less visible from the south. In this area the mine walls will be like what is permitted at this time. in the two areas where vertical benches will be left, the overall bench slopes (horizontal to vertical) may vary between Oh:ly and l.lh:ly. The Pre-Miaing Plan Map - Map ExLibit C shows what the existing natural slopes are, about 0.8h:1v in certain places along the south end of the property, and approxi- mately how the site looks at this time. From the digline to the top of the reservoir the benches will be created in an irregular pattern to breakup the straight line regularity normally associated with a quarry. A level area approx- imately 40 feet wide will be left around the reservoir and the slopes into the bottom will be mined 3h to Sv. This area is in the building envelope area and would be graded and shaped until devel- oped. Mining would then progress to the east thru the new area. Along this north side mining will change. The plan is to create a series of uniform benches. They will be higher and longer with trenches excavated on the flat surfaces to facilitate reclamation. it is anticipated that large amounts of finer material that has no market will be available as the mine progresses and this will provide a place to dispose of it. To do this the south facing slope will be mined using 60' high by 180' wide benches that will be Backfilled with the overburden and fines created during process- ing. The trench to be mined on the benches will act as a "key" to lock the compacted fill so it creates a stable 5 (Revised 8/19/02)