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.. ~ r <br />TABLE 6. (page 5) <br />Selenium (Se) increased concentration reported in spoils <br />- water at the Edna Mine (Skogerboe, et al., <br />1979); may be a pollutant associated with fly <br />ash disposal at surface mines in the western <br />U. S. (Everett, 1979); coal commonly has a <br />higher than average selenium concentration <br />(NAS, 1976); the most highly seleniferous <br />sediments in the U.S. were deposited during the <br />Cretaceous Period (NAS, 1976), most <br />coal-bearing strata in Colorado were deposited <br />during the Cretaceous Period; selenium <br />concentrations in coals and associated black <br />shales are usually much higher than average <br />(Catkin, 1973); at a pH of about 8 (common in <br />Colorado coal environments), selenite may be <br />oxidized to the soluble selenite ion <br />(Catkin, 1973); harmful to livestock if in <br />excessive concentrations. <br />Zinc (Zn) increased concentration reported in spoils <br />water at the Edna Mine (Skogerboe, et al., <br />1979); concentrations may increase in waters <br />near surface mines in the western U.S. <br />(Everett, 1979); may be a pollutant associated <br />with fly ash disposal at surface mines in the <br />western U.S. (Everett, 1979). <br />