1989-10-10_REVISION - M1988112 (12)

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The mill will be a closed circuit with backup systems to ensure that • no cyanide solutions will escape the mill. Mill facilities design specifications will be submitted to the Division upon completion. Cyanide will be stored in a secured area. The area will include a concrete base with curbs to ensure containment in the event of a spill. Cyanide will be shipped to the site in Flo-Bins. Flo-Bins are specially designed, heavy metal containers used by DuPont for shipment of sodium cyanide. Flo-Bins are accepted by the Department of Transportation as a safe shipping container for cyanide. The Flo- Bins are returnable and will not be disposed on site. Each Flo-Bin i s numbered and the numbers are tracked by DuPont to ensure that each container is returned. D.6 Tailings Disposal D.6.1 General Desion Concepts The tailings from the mill circuit will be disposed in a slurry form from the processing and treatment. facilities. • The slurry will be delivered to the tailings disposal area by pipeline using gravity and pumped delivery. The disposal system has been designed as a closed circuit, zero discharge facility. The solid and liquid portions of the tailings will remain contained within the facility. The proposed management of the facility will alleviate the potential of a detrimental impact to the surface water and groundwater of the project area and vicinity. The facility is capable of containing up to and including the probable maximum precipitation event during operations. The disposal area will be constructed with a liner system which has been chosen to provide containment and collection of the tailings water. The tailings will be deposited by spigotting around the perimeter of the disposal area. The proposed method of tailings deposition is the managed thin layer deposition technique. This technique promotes deposition of thin layers • D-ls