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<br />this determination, the DMG set forth several conditions in the referenced letter. The most <br />important of these conditions requires Henderson to "...provide a plan for reclamation that could <br />be followed by the Division in the event of bond forfeiture that would eliminate or minimize the <br />need for pumping and treating Henderson Mine water". The letter went on to state that the plan <br />provided "...need not be the primary plan to be implemented...but could be an alternate plan that <br />could be implemented by the Division in the unlikely event that the Division reclaims the site". <br />The DMG also stipulated that Henderson "...post a financial warranty sufficient to allow the <br />Divisio^ to operate the Henderson Mine water treatment facilities during the period of <br />reclamation in the event of permit revocation and bond forfeiture". <br />The referenced letter also stated that the alternate closure plan and financial warranty for water <br />treatment be incorporated into the Permit through the Technical Revision process. Thus, this TR <br />(TR-06) is submitted to the DMG i^ accordance with this letter. <br />2.0 Alternate Mine Closure Plan <br />The alternate closure plan proposed in this TR differs from the Permit plan in that (briefly) the <br />Permit plan accounts for Henderson's commitment to deliver water to the City of Golden and <br />otherwise utilize portions of the Mine as a source of water and the haulage tunnel for <br />transcontinental delivery of water. The sale of water would be used to offset the cost of treating <br />mine water over the long-term. <br />The alternate closure plan does not account for delivery or sale of any water, nor does it maintain <br />any commitments or contracts for such delivery or sale. The plan incorporates "bulkhead and <br />flood" principles and technologies to minimize and delay significantly, but not eliminate, <br />pumping and treatment of Mine waters. <br />Figure I presents a sectional view (not to scale) of the Henderson Mine illustrating the general <br />locations of shafts, production levels, and the haulage (railroad) tunnel beneath the Continental <br />Divide. <br />2.1 Present Water Treatment and Discharge <br />Presently, the Mine treats and discharges water at an average rate of 1000 gpm. Mine water <br />consists of groundwater inflow to the underground workings (400-500 gpm), infiltration of <br />precipitation through the glory hole and caved areas (200-300 gpm), and inflow from the haulage <br />tunnel at the 7500' level (200-300 gpm). Groundwater comprises approximately 50 percent of <br />the present total amount. <br />2 <br />