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The overall, generalized flow through the flooded mine workings to the surface along <br />natural fractures is expected to be approximately 70 gpm, but could be as great as <br />200 gpm. The discharge to the surface is expected to occur primarily along Cement <br />Creek between the Mogul Mine (to the north) and the Silver Ledge Mine (on the <br />south). The discharge is expected to be diffuse rather than concentrated at one <br />spring. However, if the equilibrium water level in the flooded mine workings is much <br />higher than anticipated (12,250 feet msl), up to an additional 160 gpm could <br />discharge via the Mogul Mine. The travel time from the flooded workings to Cement <br />Creek is estimated at approximately 150 years. Under the unlikely scenario that the <br />equilibrium water level in the flooded workings is at 12,250 feet msl, some of the <br />water could reach Cement Creek in as little as 4 months. <br />The computer program MINTEQA2 was used to model the geochemistry of the rock- <br />water reactions that are expected to result from the proposed bulkhead installations. <br />At the American Tunnel bulkhead, the model indicates water is non-reactive with the <br />country rock. The water behind the Terry Tunnel bulkhead is expected to be similar <br />to the water currently discharging there. Reaction with the country rock should be <br />minima4 and will probably decrease matrix permeability with time. <br />In the absence of the ability to significantly oxygenate the flooded mine, the mineral <br />load of the impounded water should be essentially that of the water that fills the mine. <br />sunnylwD~«aci12251 ~Mar1993.Rpt .3 <br />NCI S{R1011 HYDRO-SEARCH <br />