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~_ <br />Henderson Mine Permit #77-342 <br />Technical Revision 4/4/88 <br />Page 3 <br />northeast of the number one tailing dam (Figure 1). Soil was to <br />have been pushed up and hauled to two designated soil stockpile <br />areas in five-year increments. This would have necessitated moving <br />800,000 cubic yards of soil by the end of 1990. In addition, an <br />interceptor canal was to have been constructed during final <br />reclamation to divert runoff water around the recl~~imed tailing <br />area. <br />4.2 Proposed Soil Stockpile Plan <br />The soil stockpile schedule assumes an average production rate of <br />18-million pounds of molybdenum in concentrates per ,year, through <br />the year 2020. As outlined in Table 1, this production value <br />projects the estimated tailing pond elevation and acreage and the <br />quantity of soil required to cover the tailing by five-year <br />intervals throughout the life of the mine. A total of 470,000 cubic <br />yards of soil have been stockpiled through 1987. <br />I We would clear land to the new tailing-pond disturban~:e limits and <br />~ construct a perimeter access road and interceptor ditch above the <br />i disturbance limits (Figure 2). Instead of placing th~a soil in the <br />two designated stockpile areas as now described, we propose a soil <br />berm at the 8,840 contour extending from the west tranch of Ute <br />~ Creek to the main stem of Ute Creek. We plan to use existing <br />i equipment to doze available and suitable material within 300 feet <br />downgradient of the road into a soil berm along the new perimeter <br />road. The schedule for accommodating this new soil stockpile <br />~ configuration and method would be as follows: <br />11 ~ -1988 Clear timber in the tailing basin <br />c~nwwcw.~..l 1989 Survey and construct pioneer perimeter road <br />lv~ iz" ~q+a. 1990 Improve pioneer perimeter road <br />1991 Push soil into berm <br />~~ 1992 Push soil into berm <br />t <br />~~ Thereafter soil stockpiling will follow the schedule outlined in <br />`~1 Table 1. <br />`~ We request that the board approve this technical revision to our plan. Please <br />'~. contact us if you require clarification on any of the items discussed. <br />(~~ Ma~ 'ai°'e' ~E~ :au ~ ~:~,"°"' ? Sincerely, <br />~I~II ,.D <br />(i~~d~ p\ <br />CLJ/sp Charles L. Ja on <br />Attach. Resource Mana r <br />