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The Leadville Mill M 1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-4 <br /> TABLE 4-1: LEADVILLE MILL, DESIGN CRITERIA <br /> Item Design Parameter value I Unit <br /> Physical Parameters <br /> 1 RoM Moisture 4% - <br /> 2 Plant Capacity 400 dstpd <br /> 3 Plant Availability 92% - <br /> 4 Calculated Capacity 453 dstpd <br /> Crushing Circuit <br /> 5 Operating Hours 8 hr/day <br /> 6 Availability 75% <br /> 7 Trommel Fines 50% <br /> 8 Feed Rate 50% % <br /> 277.8 stpd <br /> 31.7 stph <br /> 9 RoM Feed, F80 102 mm <br /> 10 Crusher Product, P80 12.5 mm <br /> 11 Fine Ore in Capacity 280 stpd <br /> Mill Circuit <br /> 12 Ball Mill Work Index(BWi) 15.45 - <br /> 13 Mill Feed, F80 12,500 micron <br /> 14 Mill Product, P80(cyclone 0/F) 104 micron <br /> Leach Circuit <br /> 15 Thickener Feed 30% solids <br /> 16 Leach Feed 40% solids <br /> 17 Leach Time 18/24 hours <br /> 18 Feed Solids, Pressure Filter 40% solids <br /> 19 Filtration Rate 500 Ib/ft -hr <br /> 20 Filtration Product 80% solids <br /> 21 Repulp Tank 50% solids <br /> 22 Detox Tank 50% solids <br /> 4 hours <br /> 23 Vacuum Filter, Drum 100 Ib/ft -hr <br /> TROMMEL & CRUSHING CIRCUIT <br /> A new crushing building will house the trommel, crusher and screens. Basis of crusher <br /> design includes the following: <br /> • The RoM ore delivered by trucks,weighed, and stored in a 35t-200st capacity <br /> coarse ore bin, (Figure)will be crushed in a two-stage operation to a final size <br /> of about-3/8". A conveyor will move the ore to the 200t fine ore bin located <br /> in the mill building.5 <br /> 5 A1AR1Q7/Q26 <br />