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SECTIOMFOUR Tailing Delivery Systems and Storage Facility <br /> 4.4.2 Instrumentation <br /> A manually read pressure gage will be installed on the feed pipeline inlet to the cyclone <br /> manifold. The gage will be read and recorded by Climax personnel twice daily when the system <br /> is in use and upon flow or condition changes. <br /> 4.5 TAILING DISTRIBUTION SYSTEMS <br /> 4.5.1 Header Line with Spigots <br /> Tailing is distributed to the Mayflower impoundment area through a 30-inch diameter HDPE <br /> header pipe and a system of spigots. Summer operations involve the header and spigot method <br /> utilizing 6-inch diameter HDPE off-takes (spigots) on 40-foot centers along the header. The <br /> header is located on top of the deposition berm at a nominal elevation of 10,630 feet. The header <br /> will be raised regularly as the tailing dam height increases through tailing deposition. <br /> 4.5.1.1 Operation and Maintenance <br /> The primary operating issue associated with the spigots will be related to deposition and <br /> aggrading of the tailing beach. The goal is to maximize hydraulic sorting of the tailing so that a <br /> uniform and relatively free-draining shell is created in the tailing dam. This is discussed further <br /> in Section 4.5.2. <br /> The header line will be relocated during the operational life of Mayflower TSF as the height of <br /> the deposition berm increases. A Standard Operating Procedure for this process will be <br /> developed and included in future revisions to this O&M manual. <br /> The header line and spigots will be inspected each shift for cracks, unexpected displacement, or <br /> other signs of failure, with particular attention to joints and valves. Observations from the <br /> inspections will be recorded on the daily checklists. <br /> 4.5.1.2Instrumentation <br /> A pressure transducer is located in the header line near the eastern-most leadoff(Leadoff#1). <br /> The transducer reports line pressures to the mill. If measured line pressure exceeds the <br /> maximum allowable pressure,two automatic valves at an upstream cutout operate to divert <br /> tailing flow into Mayflower TSF, away from the crest and by-passing the distribution header. <br /> 4.5.2 Leadoffs <br /> Whole tailing deposition occurs from leadoffs during winter months. Currently,there are three <br /> leadoffs are located along the crest line header at 5 Dam and are numbered 1 through 3 from an <br /> east to west direction. As deposition on the Mayflower tailings storage facility progresses over <br /> time and the beach widens, additional leadoffs will be added. The eastern leadoffs consist of <br /> 26-inch diameter HDPE pipe placed on a berm extending from the dam crest toward the decant <br /> pond. Each leadoff pipe is installed at the end of each bank of spigots to allow for single-point <br /> discharge for winter operations. Leadoff pipes are extended toward the decant pond for no less <br /> than 500 feet to reduce fine tailing deposition near the dam and minimize risk of ice lens <br /> formation. <br /> ImsL:\PROJECTS\22243088_MAYFLOWER_EVAL_DES\SUB_00\12.0 WORD PROC\08M MANUAL\VERSION 1AWAYFLOWER O&M PLAN_FINAL_1.1.D0CX 4-6 <br />