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MININ6 PLAN • the Life of the operation. Of course, the projected volumes could be lower which might reduce the lifespan by perhaps 25°x. Demands might be considerably higher, as has been the experience in past years in the Colorado Springs and other areas, and this could cut the life span by 50~. Therefore, as a range, it is projected that each phase will last from two to ten years and the life of the operation will be between 10 and 50 years. We realize that this is quite a broad range, but in our experience and in • discussions with other companies in the Colorado Springs area, a 5:1 range ratio is not unreasonable. CHARA('I'F:RT$TTCwS ~ ~ (~$$`7E[, DEPOSIT: An exploratory program which was conducted prior to preparation of this permit defined the gravel deposit. The gravel generally seems to be somewhat thicker on the northern half to one-third of the site. In some places, there are several feet of overburden on top of the gravel. This is generally most true on areas along the western perimeter of the site. As the edge of the mesa is approached, the gravel is much closer to the surface and in places is essentially on the surface with no overburden. The depth of the gravel ranges from about 5 to 10 feet thick on the south end of the site to about 30 to 90 feet deep on the northern end of the site. This depth tends to vary from place to place. An average figure for the whole site is about 20 feet, plus or minus 5 feet. Underneath the gravel is a shaley material which is related to or derived from the Pierre Shale. Actual rock seems to outcrop considerably below the bottom of the gravel. It is presumed that the material under the gravel which is related to the shale is a weathered zone of material created during the period of time between the time the shale was exposed and the gravel deposited. In some places page 8 of 10 Exhibit D