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• plus 16 mm <br /> • 16-8 mm <br /> • 8-4 mm <br />C 4-2 mm <br />0 <br />5 <br /> • 2- <br />. <br />mm <br /> • minus 0.5 mm <br />1 <br /> A comprehensive description of the results of this screen analysis are <br />C found in Table 2, Screen Analysis of Waste Coal and Waste Rock Samples 1 <br /> 8 2. In both screened samples, an insufficient amount of minus 0.5 mm <br /> material was obtained for the column leach study. Therefore, Boakcliffs <br /> 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 /> <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 N42 filter paper. <br /> Nine columns were prepared, seven samples and two duplicate samples, by <br />C 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 />L density of 1.4 g/cm~. This amounted to 4509 of sample packed 34 mm deep <br /> in the columns. Leach columns containing coal material were packed at a <br />C bulk density of 1.2 g/cm3. This amounted to 3009 of sample packed 26 mm <br /> deep in the column. <br />C Wh <br />N42 fil <br />A <br />l <br />k <br />d <br />h <br /> ter paper was <br />fter the co <br />umns were pac <br />, anot <br />er <br />atman <br />e <br /> placed on the top of the sample in the column to eliminate erosion of <br />C the sample during the leaching process. <br />L Constant Flow Drip System <br />After the leach columns were prepared, a system that would deliver a <br />1 -3- <br />