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<br />How fast will the workings flood? Will there be time to remove equipment, materials, and the <br />pumping station? As discussed in Section 2.3, it will take a minimum of 9 years for waters to <br />reach the tunnel portal at 8948' without any pumping. Therefore, it is expected to take a <br />minimum of 4 years for flood waters to reach the 8100' level when pumping and treatment would <br />again be required. <br />As flooding of the Mine workings reaches maximum saturation, groundwater inflows are expected <br />to slow which, in turn, would minimize the amount of water required to be pumped and treated. <br />When the water level reaches the 8100' level and pumping is reactivated, less than 600 gpm will <br />require pumping and treatment as opposed to the 1000 gpm presently being pumped and treated <br />from the Mine. <br />In conclusion, under the alternate closure scenario, DMG would have up to 9 years to plan for <br />and install the tunnel bulkhead, and 4 to 8 years before pumping and treatment will be necessary. <br />3.0 Costs <br />The Henderson Mine believes that the financial warranty for the alternate closure plan for the <br />Mine should include the cost of engineering and construction of We haulage tunnel bulkhead plug <br />and the cost of pumping and treating water using the system described herein for a period of <br />three (3) years. The cost for engineering and construction/installation of the bulkhead are <br />inclusive and are based on actual similar costs for installation of similar bulkheads in the Urad <br />Mine. Pumping and water treatment costs are based on costs presented in the spreadsheet model <br />in Figure 4. These costs are based on actual costs and experience with the present treatment <br />system at the Mine. <br />Bulkhead $ 200,000 <br />Water Treatment (3 years) $1,716,285 <br />Total Additional Financial Warranty 1 9~ , 16.285 <br />5 <br />