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6.4.4 Exhibit D - Mining Plan <br />Table 1 <br />Phase /Cell <br />Overburden to <br />be Removed <br />Acres to be <br />Disturbed <br />Duration <br />1/1 <br />67,000 yd 3 <br />-7 acres <br />-1.0 years <br />1/2 <br />96,000 yd 3 <br />-10 acres <br />-1.5 years <br />2/1 <br />- 96,000 yd 3 <br />-10 acres <br />-1.3 years <br />2/2 <br />- 269,000 yd 3 <br />-28 acres <br />-3.5 years <br />2/3 <br />- 38,000 yd <br />-4 <br />-0.5 years <br />2/4 <br />- 154,000 yd 3 <br />-16 <br />-2.0 years <br />2/5 <br />96,000 yd <br />-10 <br />-1.3 years <br />TOTAL <br />- 816,000 yd 3 <br />-85 acres total <br />-11.1 years <br />Nature of the Overburden, Gravel Deposit, and Underlying Stratum <br />Overburden within Phase 1 and Phase 2 consists of fine sand and silt, <br />specifically Table Mountain Loam, Table Mountain Saline, and Nunn Clay -Loam <br />soils with slopes generally ranging from 0 -3 %. Its thickness varies from 0 -13 feet <br />with an average thickness of 6 feet. The gravel deposit is classified as Class A <br />aggregate (Schwochow et al. 1974), and has an average thickness of <br />approximately 9 feet throughout Phase 1, and approximately 12 feet in Phase 2. <br />The gravel is underlain by Pierre shale, consisting of a weathered zone directly <br />underneath the gravel. <br />Intended Use of Extracted Commodities <br />The sole commodity to be extracted from the mine is sand and gravel, which will <br />be processed and used for construction materials including but not limited to <br />asphalt hot mix and raw road base. <br />