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The Leadville Mill M 1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-7 <br /> TABLE 4-4: LEACH & MERRILL CROWE PERFORMANCE CRITERIA <br /> Leach Circuit <br /> Feed 40% solids <br /> Leach Time 18-Hr/24-Hr hours <br /> Volume(w/10%freeboard) 26,400/35,200 ft' <br /> Tanks 4 no. of units <br /> Tanks Size, 12-hour leach 16 x 32 ft dia.x ft <br /> Tank Size, 24-hour leach 18 x 36 height <br /> ft dia.x ft <br /> height <br /> Holding Tank <br /> Feed 40% solids <br /> Residue Time 2 hrs <br /> Residence Time 10 hrs <br /> Filter Cake 12 x 24 ft dia.x ft <br /> height <br /> Pressure Filter <br /> Feed 40% solids <br /> Filtration Rate 500 Ib/ftZ-hr <br /> Area Required 80 ftZ <br /> Filter Cake 80% solids <br /> Repulp Tank <br /> Residence Time 5 min <br /> Volume 600 ft3 <br /> Solids 50% solids <br /> Tank Size 9 x 9 ft dia.X ft <br /> height <br /> Detox <br /> Feed 50% solids <br /> Residence Time 4 Min. <br /> Volume 3,947 ft3 <br /> Tank size 18 x 18 ft dia.x ft <br /> height <br /> Drum Filter <br /> Feed 50% solids <br /> Filtration Rate 100 Ib/ftZ-hr <br /> Filter Cake 75 solids <br /> Area Required 400 ftZ <br /> 4.2.2 PROCESS MATERIAL BALANCE <br /> The material balance for the Mill was developed in concurrence with the process <br /> flowsheet and is shown in Table 4-5. The stream number shown correspond with the <br />