PERMFILE111645 - Laserfiche WebLink

Home Browse Search

~1 ~ T are' f~~ ~X~~B,~- MINING PLAN Section 1-Description of Methods C~ Eas~IT D R~pla«C Western Mobile Northern, Inc., a subsidiary of Lafarge Corporation, proposes to extract sand and gravel from a site currently used as agricultural and pastureland. The site is located on Larimer County Road 19, between the Cache La Poudre River and U.S. Ii'ighway 287. Western Mobile Northern Inc, owns this parcel of land. Western Mobile Northern, Inc. (hereafter referred to as Westem Mobile) currently operates a gravel extraction, processing, stockpiling and distribution yard just south of the proposed sight, under the DMG permit #M 77-439. Work will proceed in two phases removing a total of approximately 1,400,000 tons of sand and gravel. This will be done at a rate of between 200,000 and 800,000 tons per year, resulting in a time span of 3-7 years for completion of mining and reclamation. ~~ The methods used for this operation will be consistent with dry, open pit mining. Phase 1 will consist of digging a one hundred foot wide dewatering trench around the perimeter of the pit. A settling pond area will be created in the southwest corner of the pit. Water ~Ql will be pumped directly from the settling pond to the Cache La Poudre River. All necessary NPDES-type permits will be acquired prior to discharge. Sediment trapped in the settling pond will be removed as needed and used for reclamation. Overburden will be used to create landscaping berms along the County Road 19 frontage. Remaining overburden will be stockpiled aoound the perimeter of the pit. A conveyor maybe constructed to transport resource to an existing conveyor that crosses the Cache La Poudre River. Material may also be transported across the river by a low-water crossing. Material may either be processed on the pit floor or conveyed to existing facilities and processed there. Material maybe stockpiled on the pit floor, or on the existing adjacent operation, either north or south of the river. Phase 2 will remove the remaining pit material. Mining will begin in the southwest corner, proceeding in approximately 200-foot strips oriented north to south. Muting will move from west to east, such that the last material to be mined will be the closest to the County Road frontage. Overburden will be stockpiled on the perimeter or the pit bottom as necessary, although reclamation may begin while mining is in process, minimizing the space that overburden materials will occupy in stockpiles. Resource will be handled in a manner similar to Phase 1, eventually being transported across the river to existing distribution yards on the south side. The resource will be used for internal as well as public sale.