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4. Mill Water Return System. <br /> Water seepage through drains laid under the tailing dam combines with <br /> water being decanted off the tailing pond water pool, and is collected <br /> in a five million gallon capacity clearwater pond. This pond serves <br /> as a pumping basin for the pump station. Five vertical pumps, each <br /> with a 125 horsepower electric motor, pump directly into five 6,700 gal- <br /> lon per minute horizontal single stage centrifugal pumps. Each of <br /> these larger pumps is driven by a 2,000 horsepower motor. An elaborate <br /> system of pump controls sequences pumps to meet pumping requirements. <br /> This control system also insures that the pumping load is distributed <br /> equally among the five pumps as the demand increases. <br /> The water is pumped back into the existing mill water circuit through <br /> 4. 1 miles of 42" I.D. steel pipeline. This pipeline normally operates <br /> at a pressure of 381 pounds per square inch. The pipeline discharges <br /> onto Robinson Tailing Pond, (the highest pond in elevation and the <br /> closest pond to the Mill) , where the water is then pumped to the Mill <br /> using existing facilities. <br /> + <br /> 6P <br /> 4 <br /> Figure 7. Pumphouse Interior <br />