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<br />Iron <br />The iron concentration range from 5.9 to 106.0 ppm. <br />Lead <br />The Montana Overburden Guidelines established a toxic <br />concentration level at 20 ppm. The values recorded for this <br />parameter range from less than 0.1 to 5.1 ppm which is well <br />under the toxic level. <br />Manganese <br />The raage of manganese values is 0.2 to 6.5 ppm. <br /> <br />Mercury <br />The levels of mercury encountered are all less than 0.1 ppm <br />thus no reclamation problems due to high concentrations of <br />mercury are expected. <br />Molybdenum <br />The Montana Guidelines establish a toxic level for molybdenum <br /> <br />at 0.3 ppm or greater. Of the strata to be affected only the <br />floor rock of the Cass seam at 0.47 ppm has a value higher than <br />the recommended level. Care will be taken to recover the exposed <br />rock as soon as possible after removal of the coal. <br />16Z <br />