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CONCLUSIONS <br /> Groundwater appears to be entering the Howardsville Mill tailings, reacting with sulfides to form <br /> acid, and reacting with metalliferous minerals, particularly Zn, and releasing acid and dissolved <br /> metals into the Animas River below the site. Pre-law tailings host wells that have higher <br /> concentrations of metals, but their overall contributions cannot be calculated from the at-hand <br /> information. Tailings that have been deposited under the current permit also are host to <br /> groundwater wells that have elevated metal concentrations, and these appear to have begun releasing <br /> metals and acid after 1985. <br /> cc: Bruce Humphries �L,/-Z l6LC&&„,� 7-1 <br /> Tom Gillis w l ci ftc-,e,,.,,�f-i <br /> Jim Pendleton <br /> A:ViOWARDVI.MEM <br /> 6 <br />