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to mix this material with tailings at a percentage ratio to attain proper compaction. No <br /> voids can be present in the compacted mixture that will result in a non-cohesive material <br /> or will provide voids for water conduits. <br /> Rules: <br /> a- Waste rock shall be mixed with tailings at a ratio range of 0-15% waste rock to <br /> tailings. If waste rock is being produced at a given time in higher ratios to the <br /> tailings, it should be stockpiled temporarily so that it can be mixed at the proper <br /> ratio over time. It is acceptable to compact tailings with no waste rock. <br /> b- Any wood,plastic, metal or other non-rock material should be removed from the <br /> rock prior to mixing and placement. <br /> c- The waste rock should be thoroughly mixed with tailings prior to compaction <br /> with the site equipment. <br /> d- Compaction of the tailings/waste rock mixture must be attained(covered later in <br /> this guidance manual). <br /> 5 <br />