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1 In an effort to determine the salt available for leaching <br />2 laboratory columns of spoil material were leached under controlled <br />3 conditions. An experiment vas tun to determine the relationship <br />q between the electrical conductivity of the leachate and the accumulated <br />5 leachate volume for various size fractions of spoil material. It vas <br />g assumed that the amount of salt leached and the rate with which the <br />q salts come out are related to the particle size distribution of the <br />8 material. Column lengths were also varied to examine the possibility <br />g of scaling the leach data for depth. Because some materials when <br />10 vetted tend to seal thus preventing leaching, batch extraction was <br />11 included in the study to provide an alternative to leaching. <br />1~ !fa[erials and Nethode <br />I <br />13 Tvo columa leaching experiments were carried out to relate salt <br />14lleached to particle size distribution and column length. The spoil <br />LS material used for the particle size experiment vas shale from the <br />Williams Fork formation on the Colorado-Yampa Coal Co. ?fine No: 1 <br />17~southwest of Steamboat Springs, Colorado and quartz sandstone derived <br />material from the Dave Johnston !tine near Glenrock, Wyoming. The <br />fg~particle size distribution data from field excavations are presented in <br />ZO~Tables l and 2. The Williams Fork material .is a grey shale which <br />before blasting and ezcavation ie massive. After excavation it <br /> <br />contains many rocks in the range of 0.1 to 1 meter in diameter. The <br />t3 Glenrock material after disturbance bad few rocks greater than 200 mm <br />~4 in diameter with moat material leas than 20 mm. <br />;5 For the particle size experiment, material from both locations was <br />r6 used. Air dry material vas dry sieved to a range of size fractions <br />17 between 0 to 0.5, 0.5 to 2, 2 to 4, 4 to 8, and 8 to 16 <br /> <br />J <br />• <br />2 <br />