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Reagents <br />Lime <br />Xanthate <br />Water <br />Rate <br />0.2 lbs /ton' <br />0.07 lbs/ton <br />0.8 st H ore <br />Amount used <br />5.6 st/yr <br />1.9 st/yr <br />- <br />Amount used <br />- <br />- <br />45,700 st H /yr <br />The Leadville Mill <br />M1990-057 <br />EXHIBIT C — MILL PLAN <br />Page 4 -5 <br />Water will be added at the ball mill discharge trough. Reagents will be added at the <br />ball mill and the conditioning tank through reagent feeders. As shown in Table 4 -1, <br />lime will be added at the grinding mill and /or the conditioning tank to control pH. <br />Xanthate will be added as a promoter at the grinding mill for increased reagent <br />reaction time. Lime will be added through a dry reagent feeder and the xanthate is a <br />1% solution, mixed on site. <br />Typical reagent usage added at the grinding circuit is presented in Table 4 -1. Dust <br />emissions are generated when the dry chemicals are added to the reagent mixers. <br />Negative pressure ventilation collects fugitive particulate matter emissions from the <br />reagent mixing area. The same dust collector used in the crushing and conveying <br />circuit captures the emissions. <br />TABLE 4 -1: CHEMICAL USAGE, BALL MILL <br />1 Reagents rated base on dry ore feed tonnage <br />2 Dry tons of reagents per year <br />3 Liquid tons of reagents per year <br />4.2.4 FLOTATION CIRCUIT <br />The comminution product reports to the rougher flotation circuit where it is mixed <br />with water to achieve a density of 35% solids by weight, which is carried through to <br />the scavenger and cleaner circuits. <br />The rougher flotation cell bank consists of six, 25 "x24 "x29" (60.4 ft tank cells. Tails <br />from rougher flotation will report to the scavenger flotation circuit which consists of <br />six, 25 "x24 "x29" (60.4ft tank cells. Tails from the scavenger flotation circuit report <br />to the tails thickener. <br />The concentrates from the rougher and scavenger flotation cells report to the cleaner <br />flotation circuit, which consists of two, 25 "x 24 "x29" (20.1ft tank cells. The tailings <br />from the cleaner flotation circuit report back to the scavenger flotation circuit for <br />additional residence time. <br />Version 1.0 April 2013 <br />