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D.6.7 Facilities Operation <br />• D.6.7.1 General <br />The tailings disposal area is designed to be operated <br />using a thin layer, managed deposition technique. Based upon <br />the design criteria adopted for the disposal area design, the <br />area will be operated to maintain zero discharge. <br />D.6.7.2 Depositional Sequence <br />During Phase 1, transport of tailings slurry will be in <br />a pipeline system located on the 8,590 bench in the disposal <br />area and a bench on the interior side of the main embankment <br />at elevation 8,550 ft. During Phase II of operation, tailings <br />will be deposited from a bench at the 8,620 elevation. The <br />8,590 and 8,620 benches are continuous around the perimeter <br />of the Phase I and Phase II disposal area, respectively and <br />• will also serve as an access road. As discussed in Section <br />D.6.5.1, the benches will be lined. <br />Initial spigotting will be primarily from the east and <br />west ends of the disposal area in order to maintain the free <br />water pools adjacent to the access ramps on the splitter <br />embankment. In addition, selective spigotting points around <br />the perimeter will be utilized so that the valley bottom in <br />the disposal area is covered by tailings. This will prevent <br />the occurrence of excess hydraulic head on the liner system. <br />The tailings disposal distribution system for Phase 1 is shown <br />on Figure C-11. Phase 2 distribution is shown on figure C-12. <br />Tailings solids will settle from the slurry to form a <br />beach sloping toward the free water pools. Recirculation of <br />the water will be performed on a continuous basi<. to limit the <br />free water within the disposal, to a maximum of 50 acre-ft. <br /> <br />D-46 <br />