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Reagents <br />DAF -30 <br />Rate' <br />0.008 lb /st <br />Concentrate Feed <br />6,150 st/yr <br />Amount Used 2 <br />50 lb /yr <br />Reagents <br />DAF -30 <br />Rate' <br />0.008 lb /st <br />Tails feed <br />49,850 st/yr <br />Amount Used 2 <br />400 lb /yr <br />The Leadville Mill <br />TABLE 4 -3: CHEMICAL USAGE, CONCENTRATE THICKENER <br />1. Reagent rate based on dry concentrate feed tonnage (11% concentrate per ton) <br />2. Tons of reagent per year <br />4.2.6 TAILINGS CIRCUIT <br />M 1990 -057 <br />EXHIBIT C — MILL PLAN <br />Page 4 -7 <br />Tailings from scavenger flotation will be sent to a tailings thickener. Thickened <br />underflow will be sent to the tailing storage facility at 65% solids in piping laid in an <br />accessible concrete trough. Overflow ranging from 25 to 35% from the tailings <br />thickener will be returned to the circuit as process water. Reclaim water from the <br />TSF will also be used as process water. <br />Reagents are added at the thickener through a reagent mixer, diluted. As shown in <br />Table 4 -4, DAF -30 approximately 2.3Ib /day will be added as a flocculent (same <br />reagent as used in the concentrate thickener). <br />TABLE 4 -4: CHEMICAL USAGE, TAILINGS THICKENER <br />1 Reagent rate based on dry tailings feed tonnage — 11% concentrate per ton <br />2 Tons of reagents per year. <br />4.2. CHEMICAL REAGENT INVENTORY <br />Lime, xanthate, pine oil and DAF -30 are the chemicals /reagents stored within the <br />mill. Lime, xanthate and DAF -30 are dry reagents and the pine oil is a liquid reagent. <br />Table 4 -5, summarizes the estimated reagent inventory, daily consumption and <br />monthly inventory. Only one day's operating supply is in the reagent feeders at any <br />one time. <br />Version 1.0 April2013 <br />