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' • plus 16 mm <br />• 16-8 mm <br />• 8-4 mm <br />• 4-2 mm <br />s 2-0.5 mm <br />' • minus 0.5 mm <br />' A comprehensive description of the results of this screen analysis are <br />found in Table 2, Screen Analysis of Waste Coal and Waste Rock Samples 1 <br />' & 2. In both screened samples, an insufficient amount of minus 0.5 mm <br />material was obtained for the column leach study. Therefore, Bookcliffs <br />t crushed a portion of the 2-0.5 mm sized material to obtain the needed <br />amount of minus 0.5 mm material. <br />Preparation of Leach Columns <br />' After the samples had been prepared for analysis, Bookcliffs began <br />preparation of the leach columns. The leach columns consisted of 110 mm <br />' diameter Buchner funnels lined on the bottom with nylon screen and a <br />Whatman #42 filter paper. <br />' Nine columns were prepared, seven samples and two duplicate samples, by <br /> packing the columns with minus 0.5 mm material. Leach columns <br />' containing floor, roof, or waste rock material were packed at a bulk <br /> density of 1.4 g/cm3. This amounted to 4509 of sample packed 34 rrrtn deep <br />' in the columns. Leach colum ns containing coal material were packed at a <br /> bulk density of 1.2 g/cm3. This amounted to 3009 of sa mple packed 26 mm <br />' deep in the column. <br />' After the columns were packed, another Whatman #42 filter paper was <br /> placed on the tap of the sample in the column to eliminate erosion of <br />' the sample during the leaching process. <br /> Constant Flow Drip System <br /> After the leach c olumns were prepared, a system that would deliver a <br />1 <br /> -3- <br />' <br />