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6.4.4 Exhibit D <br /> Mining Plan <br /> The Two Rivers Pit is an existing site that encompasses 357.2 acres. Of this acreage, <br /> 336.9 acres will be mined/disturbed while 20.3 acres will remain unaffected. The target gravel <br /> source is located beneath limited topsoil and overburden. The primary commodities are sand <br /> and gravel. Incidental materials not used for construction material will be used to reconstruct <br /> the pit floor and lessen the pit slopes. <br /> The site is made up of mostly Otero dry sandy loam, Cascajo very gravelly sandy loam, <br /> Gelberg-Haversid complex. The target gravel source is located beneath limited topsoil of 0-6 <br /> inches and overburden of an additional 4-12 inches. Topsoil and overburden will be saved for <br /> reclamation of the mine site. The stratum beneath the deposit is presumed to be blue shale. <br /> The primary commodities are sand and gravel. Incidental materials not used for construction <br /> material will be used to reconstruct the pit floor and lessen the pit slopes. <br /> The life of the proposed operation is speculative due to ever changing economic <br /> conditions in the construction industry. If economic demands remain low and extraction is <br /> limited to 70,000 tons per year, approximately six acres per year would be mined. At this rate, <br /> the life of the mine would extend to over 50 years. <br /> Mining had previously begun with the original operator of the site. Fremont intends to <br /> continue to mine out what will be referred to as Phase One, which is the original mine area, and <br /> then move into Phase Two. A dewatering pond will be located on the north side of Phase Seven <br /> and will be established early on in this new mine plan. It is anticipated that water will be <br /> intercepted during the mining of Phase Two. This water will be directed through a trench to the <br /> dewatering pond. Reclamation will occur concurrent to mining with any excess material from a <br /> phase being used as backfill in the previous phase. At no time will greater than 100 acres be <br /> open for active mining or reclamation. Once one phase has been backfilled and top soil has <br /> been applied, Fremont will then proceed to open a new phase of mining using that phase's <br /> waste material to create slopes of 3H:1V in the previous phase. This process will continue <br /> throughout the site following the phase numbering noted on the Phase Map. <br /> Mining will occur to a depth of approximately 45 feet. Groundwater is expected to be <br /> encountered during excavation and mining. Water will be pumped from the facility with <br /> surface water onsite not exceeding 1 acre. This water will be pumped from the mine area <br /> through a ditch to the dewatering pond. The water will then flow to the Arkansas River, where <br /> it will be discharged at a rate equal to that of the pump. At this time,the rate of that release is <br /> unknown. If, after the discharged water tests show that the water needs to be pumped into a <br /> settling pond prior to being released into the Arkansas due to the Division of Water Resource <br /> requirements, a settling pond will be built in which the water from the mine site will be stored <br />