2020-07-24_REVISION - M1979192 - Laserfiche WebLink

Home Browse Search

6.4.4 EXHIBIT D—MINING PLAN (a) Methods of Mining The mining of amended acreage including the Osborn tract and Wild Burro Investments LLC tract will proceed in the same manner as the original 42.4 acres of affected land within the 53.9 acre original permit area. The no mining zones described in the 1999 Conversion application Mining Plan will remain along the northern and western reaches of the original 53.9 acre mining tract. In the proposed expanded mining area,the mine operator expects to encounter a minimum of two and up to five feet of soils and overburden overlying the target gravel deposit. As shown on the map,mining is planned to take place in four phases of various sizes,starting with Phase 1,Osborn land and Wild Burro Investment land lying south of Osborn property. Overlying soils and overburden will be pushed via bulldozer to the north boundary of Osborn lease property to form a berm and to the northern end of bonded Phase 1 land immediately south of the mining zone. Once a sufficient area has been uncovered to expose a year's volume of estimated production(approximately 2800 tons per foot per acre times 15 feet of gravel thickness=42000 tons), two to three acres=126,000 tons raw material before processing, portable crushing and screening equipment will be sited as close to the gravel face as practical to excavate and load raw material via front end loader into the crushing system. Mining will begin on the newly permitted area from the east border of the original permit area progressing eastward into Osborn property. Approximately two to three acres of land will be stripped of overlying soils per crushing cycle. Stacking conveyors will be employed to move final products immediate west of the operating face to a distance suitable for room to stockpile product and load out highway trucks. In this manner,an area approximately 300'x 400' per crushing cycle will be disturbed. During the initial stripping of Phase 1 area,surface soils and suitable planting media will be pushed up along the 50'wide no mining zone along the south boundary of the Osborn property to result in a visual and noise mitigating berm which will be planted to Kim Praire grass mix per Reclamation Plan recommendations. The berm will be approximately 10'high with side slopes not exceeding 3:1(H:V)during mining and 4:1 final grade after mining is completed in this area. In the event that excess soils and overburden are encountered than can be pushed directly to final placement,the material will be stockpiled in the southeastern portion of the original permit area currently occupied by product stockpiles that will migrate eastward as mining and processing operations progress in that direction. Overburden piles will be sited in various shapes and volume to facilitate open drainage of the pit floor to the west and south. Piles will be graded to 3:1 slope and seeded with annual grass mix to minimize wind-blown emission.