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~~Technical Revision to <br />Henderson Mine Permit C7o. 77-342 <br />Page 7 <br />minimizing unnecessary disturbance of areas subject to the <br />potential for erosion and maximizing the cost effectiveness of <br />this program. <br />The total area to be covered by tailing is approximately <br />1551 acres (re: 1981 amendment to permit). Therefore, the <br />total quantity of soil required to cover3 the entire tailing <br />surface one foot deep is 2.5 million yd During construction, <br />in addition to $lacing soil on the railroad berm, we stoc):pile~d <br />about 14,000 yd in front3 of the tailing dam. In 1978, <br />approximately 421,000 yd of soil from within the tailing basin <br />were stockpiled in Ute 3Park. Since 1978 we have placed <br />approximately 35,000 yd on benches of the tailing dams, <br />cleared for and constructed a road to another of the designated <br />stockpile areas, pushed soil up from the encroaching tailing, <br />and initiated hauling to the arrea. To date, therefore, these <br />amounts total about 470,000 yd . <br />The proposed soil salvage sequence that follows is tied <br />directly to the rate of tailing deposition throughout the <br />life of the mine: <br />Our revised plan is to continue to push up soil from the <br />perimeter of the tailing through 1985 for haulage to a <br />stockpile area at any time prior to the tailing contacting the <br />pushed-up soil. Thereafter, we will repeat this push up (or <br />scrape) and haul procedure on five-year cycles throughout the <br />life of the mine. This will maintain on five-year intervals, <br />beginning in 1990, sufficient stockpiled soil to cover the <br />tailing in existence at the end of each interval. The actual <br />status at the end of each year will be described in our Annual <br />Report. <br />Please contact us if you require clarification on any of <br />the items discussed. <br />Sincerely, <br />~~~~. <br />Charles L. Jac s n <br />Environmental ntrol Engineer <br />Henderson Aline <br />Larry F. Brown <br />Deputy Director, Environmental Control <br />Molybdenum Division <br />~LJ:LFB:hmn <br />