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Exhibit D Mining Plan The proposed mining activity will take place on the low bluffs that rise above the valley floor south of the Arkansas River down-stream from Canon City. Mining will begin in phases bef,in- ning with the area presently permitted by the Colorado MLRf3 and be completed in about 10 years on adjacent land to the west. The mining activity will leave a neatly graded terrace overlooking the Arkansas River valley that is ideally suited for home sites. The gravel deposit found on the lower reaches of the bluff is underlain by a layer of sandstone. The 'sandstone appears at the surface level of the present mine floor along the northern bound- ary of Area A, as shown on the map, Exhibit C. The sandstone layer tilts downward at about a two degree angle on an east/west axis so that at a distance of 450 to 500 ft, south, the layer is found about 10 to 12 ft. below the elevation of the nearly level mine floor. The sandstone layer, tilced to the south, creates a natural. groundwater reservoir beneath the bluffs that parallel the river. No mining activity will disturb the groundwater reservoir. As in the past, all mining will halt above the groundwater table. In its natural state the gravel deposit is about 18 ft. thick along the northern boundary of the proposed area and dips with the sandstone layer into the bluff to the south. The over bur- den ranges from near zero on the north to 40 ft. or more further south, which is due in part from the natural rise in the terrain on the proposed area. ConsegNently, as mining proceeds south into the bluff, the self-imposed determination to mine above the groundwater table reduces the amount of available gravel deposit.