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testing. Air is purged from the system by introducing argon gas under pressure into the tail tank <br />and forcing it out through a water reservoir. The water reservoir permits air to Ibe expelled from <br />the tail tank while it remains sealed. <br />2.4.2 Sample Preparation <br />The following steps were taken for preparation of the samples utilized for column testing. <br />1. Moisture content tests were performed on a representative gr¢up of samples <br />within the bore hole column to obtain an average value for use Gn pore volume <br />calculations. <br />2. Specific gravity tests were then performed on a representative nuthber of samples <br />within the bore hole to obtain an average value to use fof pore volume <br />calculations. <br />3. Once average specific gravity and moisture content values were obtained, a value <br />for the dry density needed in the column to produce one pore volume was back <br />calculated. The desired pore volume size is approximately one liter, <br />4. The amount of material needed from each individual sample was titen determined <br />by dividing the total weight from step 3 by the number of individual samples <br />from the bore hole. <br />5. Tailings material was then loaded into the column at the desired density in the <br />same tailings profile or sequence as found in the tailings disposall area. <br />2.4.3 Test Procedure <br />Once the sample preparation steps were completed, pressurized argon gas was ¢assed through <br />t~ <br />