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<br />Plant tissue samples were taken from smooth brome and white Uutch clover <br />growing in plantings of different ages on waste rock-capped tailing and <br />reclaimed at the Urad Mine and analyzed for arsenic, aluminum, zinc, iron, <br />lead, manganese, copper, molybdenum, cyanide, and fluoride. l~he analyses <br />showed the following: <br />1. Foliar concentrations of the chemical constituents tested were much <br />higher in white Dutch clover than in smooth brome. Wi•ch regard to <br />molybdenum and fluoride, the observed levels in white [~utch clover <br />might be considered dangerous to ruminant animals using those <br />clover plants as their sole source of forage. <br />2. Copper to molybdenum ratios in both species were well below the 2:1 <br />level thought to be a threshold for the occurrence of molybdenosis <br />in ruminants. <br />3. Samples from older seedings had lower foliar concentrations of most <br />constituents than plants from more recent seedings, suggesting <br />decreased uptake by older plants and/or decreased availability of <br />the constituents in the growth medium. <br />9.1.9 Research on Plant Cover, Species Diversity, and Production of <br />During 1979, Climax initiated research at the Urad and Henderson mine sites <br />of obtain a quantitative assessment of vegetation success ove~^ reclaimed <br />areas. The initial research was conducted by M.J. Trlica of Colorado State <br />University (CSU). Future evaluations of vegetation succe>s will be <br />conducted every three years. <br />Cover, species diversity (richness), and production were sampled in the <br />following areas: reclaimed Urad tailing pond areas seeded in .1975, 1976, <br />and 1977, a borrow pit near the Urad tailing ponds (seeded in 1974), a cut <br />slope near the Henderson Mine Office (seeded in 1972), and a c+>ntrol area <br />adjacent to the Urad site, which was burned in 1879. Cover t+nd species <br />diversity (richness) were sampled using 0.1 m2 quadrats and Faced point <br />samples. Production was sampled using a double sampling technique. <br />17 <br />