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4. Procedures for Attaining Proper Compaction of Tailings and <br /> Waste Rock <br /> The tailings and waste rock mixture must attain a compaction of 94% maximum dry <br /> density according to ASTM Standard D698 to attain proper compaction. Compaction test <br /> equipment must be on hand at all times to test the material after compaction. There are <br /> many types of equipment and methods to attain required compaction. Vibratory rollers <br /> or sheeps-foot compactors are very good in this type of material. Front end loaders will <br /> also normally get acceptable compaction as long as they are able to negotiate all areas of <br /> the pile during construction. A small manual operated vibratory compactor may be used <br /> for small areas that larger equipment cannot reach. <br /> Lift thickness plays an important role in attaining good compaction. The smaller the lift <br /> thickness, the better chance of achieving proper compaction. Experimentation with the <br /> equipment, lift thicknesses and the amount of passes that the equipment makes will <br /> determine what will be the most efficient method to attain the compaction. Higher lift <br /> thicknesses must avoid problems in creating a zone below the surface that is not <br /> compacted properly while the surface shows good compaction. <br /> Rules: <br /> a- The compacted tailings and waste rock shall be tested for proper compaction at <br /> a minimum rate of one test per loo tons until such time as procedures and <br /> methodology have been worked out. Once consistent equipment procedures are <br /> developed and tests show stable performance, testing can be reduced. The waste <br /> rock should be thoroughly mixed with tailings prior to compaction with the site <br /> equipment. <br /> b- Frequency of the compaction testing of the tailings/waste rock mixture must be <br /> increased if there is reason to believe that some unusual condition exists, such as <br /> very high moisture content from rain or snow, etc. <br /> i <br />