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6.4.4 Exhibit D - Mining Plan <br />Mining Methods <br />The mine plan has been divided into two Phases for the purpose of bonding each <br />phase separately. Phase 1 is divided into two mining Cells and Phase 2 is <br />divided into 5 mining Cells as shown in Exhibit C-2. Mining is expected to <br />generally proceed in the numeric order assigned to each Phase and Cell. <br />The sand and gravel deposit is overlain by 6"-8" of topsoil followed by 6-8ft of <br />overburden material, which will be removed by scrapers prior to excavation of the <br />sand and gravel. The excavation typically utilizes track mounted excavators, but <br />may use front end loaders as well. Excavators or loader transfer the sand and <br />gravel to offroad haul trucks, which then transport the material to the processing <br />area. The operation will typically open up and work an area of 5-10 acres at a <br />time. The average depth of the pit will be approximately 17-18 ft below ground <br />surface. The maximum depth of the pit is not expected to exceed 25-26 ft below <br />ground surface. Pit slopes are expected to average 0.5HIV. <br />Earthmoving <br />Earthmoving begins by stripping the upper 6"-8" of topsoil, which will be placed in <br />discreet stockpiles for use in final reclamation. Topsoil stockpiles will be <br />stabilized by temporary revegetation. Temporary revegetation seed types shall <br />be primarily those types shown in Table 6.4.4-1 and selected depending on <br />planting season. Seed will be applied by hydroseeding. <br />Table 6.4.4-1-Temporary Revegetation Pure Live Seed Table. <br />(Common name) Growth Season Pounds of Pure Live Seed (PLS)/acre <br />(add 50% for hydroseeding) <br />Oats Cool 35 - 50 <br />Spring wheat Cool 25 - 35 <br />Spring barley Cool 25 - 35 <br />Annual ryegrass Cool 10 - 15 <br />Millet Warm 3-15 <br />Sudangrass Warm 5-10 <br />Sorghum Warm 5-10 <br />Winter wheat Cool 20-35 <br />Winter barley Cool 20-35