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6.4.4 Exhibit D - Mining Plan <br />Winter rye Cool 20-35 <br />Triticale Cool 25-40 <br />The initial excavation for any given mining cell will occur in areas designated for <br />backfilling. This will allow for direct replacement of overburden as stripping <br />occurs in the next adjacent area. The initial excavation for some cells will require <br />stockpiling of overburden. The maximum volume of overburden stockpile will not <br />exceed 150,000 yd3 at any one time. Stockpiles associated with processing and <br />the HMA plant (finished product and pit run) will occur in addition to the <br />overburden stockpiles and at larger volumes,(150,000 yd3 - 250,000 yd 3). <br />Water Diversions and Impoundments <br />Trenches will be excavated at the toe of each cell wall to expose groundwater, <br />which will be pumped to a sediment pond prior to discharging to the Big <br />Thompson River. <br />The existing irrigation system is owned by Coulson Excavating Co, Inc. and <br />consists of surface irrigation pipe for sprinkler irrigation. The piping will be <br />disassembled prior to mining and will not be re-installed after mining is complete. <br />Timetable <br />The mine plan is expected to generally follow Table 6.4.4-2, however the <br />timetable may vary according to market conditions. <br />Table 6.4.4-2 - Approximate Mining Timetable <br />Phase/Cell Overburden to <br />be Removed Acres to be <br />Disturbed Duration <br />1/1 67,000 yd -7 acres -1.0 years <br />1/2 961000 yd -10 acres -1.5 years <br />2/1 96,000 yd -10 acres -1.3 years <br />2/2 269,000 yd -28 acres -3.5 years <br />2/3 38,000 yd -4 -0.5 years <br />2/4 154,000 yd -16 -2.0 years <br />2/5 961000 yd -10 -1.3 years <br />TOTAL 816,000 yd -85 acres total -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