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MINING PHASING_ In many operations, phasing is possible. In standard <br />• sand and grave] pits such phasing is possible because the sequence of <br /> mining is clearly dictated by the nat ure of the deposit. In this <br />operation, mostly because of its size, precise phasing is not realistic. <br />Same general directions of mining and areas of mining are dictated by <br />the land itself, but beyond that phasing is extremely difficult. <br />Another factor in phasing that is difficult in this situation is <br />the variable nature of the sand mar{;et itself. One year the demand far <br />sand may be very high while the next year may see a sand demand at only <br />a fraction of the previous year. The timetable far this operation is <br />based upon an optimistic projection of growth in Colorado Springs as <br />well as the assumption that no significant changes will occur in the <br />production of sand 6y competitors. Based on this it is conceivable that <br />the operation could last about 30 to 50 years assuming sand depth aver <br />• the acreage in the permit is an average of 70 feet. If that depth <br />declines in the outlying areas of the permit then this time frame could <br />be reduced by as much as 10 years. Needless to say, predicting what the <br />demand will be and what the actual reserves are is very speculative, but <br />this is a [lase estimate. In the event this estimate changes <br />significantly then it would be changed in the permit via a technical <br />revision. <br />The mining plan map is divided into rough phases that are based <br />upon the lay of the land and the ownership boundaries. Each of these <br />phases represents a mare or less independent unit of mining area. A <br />brief description of each phase follows. The phase number is followed <br />by a letter suffix (either a or w) indicating which side of Academy <br />• Boulevard the phase is found. <br />S I~ <br />~o~ ~ , <br />F'AGE 7 OF 11 - EXHIEtIT D <br />