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This water, once equilibrated with mine minerals, is not expected to react further with <br />vein minerals or country rock as it migrates laterally to discharge at the surface. <br />The modeled waters, upon discharge at the surface, will equilibrate with atmospheric <br />carbon dioxide and oxygen. The greatest chemical change to the system will be that <br />of changing from reduced (subsurface) waters to oxygenated (surface) waters. <br />Oxides of most of the metals are less soluble than are the minerals associated with <br />reduced species and most of the mineral load will be precipitated from the water. <br />This is analogous to the process which formed the natural iron "bogs" in the area.' <br />Using conservative assumptions, the installation of these bulkheads is expected to <br />deliver the following metals load (Ibs/day) to Cement Creek: iron, <.1; manganese, <br />c.1; zinc, 8.1 to 20.3; cadmium, .009 to .036; lead, .16 to .40; and copper, .22 to <br />23. <br />aunnylwpltraci122511Mar1993.Rpt 4 <br />H:{ SIR1011 HYDRO-SEARCH <br />