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<br />~ because the use of a capillary barrier of fragmented rock overlying the <br />tailing was planned and thus the immediate need for reclamation at Urad was <br />a knowledge of how to successfully revegetate the fragmented rock. <br />9.1.3 Dust Control <br />For a two month period in 1970, research at Climax was ~'nitiated to <br />determine the best method of controlling fugitive dust from the tailing <br />deposition areas. Jim Brown of AMAX, and Environment~rl Services <br />Incorporated, a subsidiary of AMAX were responsible for monitoring and <br />reporting the results of fugitive dust research. The criteria used to <br />select a suitable suppression agent included penetration and performance, <br />application efficiencies, biodegradeability, and economics. <br />One of the chemical agents tested included lignin sulfonate, a chemical <br />byproduct of wood pulping by the sulfite process. Lignin sulfbnate becomes <br />water insouluble after application. <br />Coherex, a resinous adhesive, was used on two plots on Dam No. 1 in July <br />1970. Two rates of 1:4 water solution were applied. Each plot Nos 20 sq yd <br />and the application rates were 0.5 gal/sq yd in one plot and 1 ~lal/sq yd in <br />the other plot. <br />Peneprime, a bituminous base product, was used on the original tailing pond. <br />Peneprime hardens into an asphalt-like layer which is impermeable and would <br />probably slough in large pieces from the dam face. <br />Aquatain, a pectin base stabilizer, was used on a glacial till slope. <br />Aquatain remains water soluble after application and in a few weeks was no <br />longer evident at the treatment site. <br />Sodium silicate, when applied in quantities of 4.5 1b/yd2, is an effective <br />stabilizer. When calcium chloride is added, the results are the same and <br />the decrease in silicate required reduces costs considerably. <br />9 <br />