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Reagents Pine Oil Rate 1 0.04 lb /st Amount Used 2 2,240 lb /yr Amount Used 3 - The Leadville Mill The concentrates from the cleaner flotation circuit reports to the concentrate thickener. Underflow from the classifier reports to the conditioning tank where additional xanthate may be added. As shown in Table 4 -2, pine oil is added as frother. Pine oil is diluted from a 100% pine oil liquid solution. Additional xanthate and pine oil may be added in limited amounts to the rougher, scavenger, and cleaner flotation cells, as needed to adjust concentrations for optimal recovery of metals. TABLE 4 -2: CHEMICAL USAGE, CONDITIONING TANK 1 Reagent rate on dry-ore feed tonnage. 2 US gallons of reagents annual quantity. 3 Liquid US tons of reagents annual quantity. 4.2.5 CONCENTRATE CIRCUIT M 1990 -057 EXHIBIT C — MILL PLAN Page 4 -6 The concentrate from the second flotation cleaner cell will report to a thickener to maximize process water recovery. The thickened concentrate, 65% solids, will go to the concentrate filter. The filter additionally recovers process water. The material is 65% solids entering the filter and 90% solids exiting the filter. Overflow from the concentrate thickener will be returned to the circuit as process water. The concentrate filter gravity discharges its concentrate cake onto a conveyor which transports the concentrate into a 4 ton bin from where it is loaded into super sacks or drums for shipment. The sacks or drums will be stored within the facility until shipped. The super sacks or drums will be loaded on highway trucks for shipment. The concentrates will contain Tess than 10% moisture. Reagents are added at the thickener through a reagent mixer, diluted with water and added through a chemical feed pump. As shown in Table 4 -3, DAF -30 will be consumed at an estimated amount of 0.31b /day for representative ore. Version 1.0 Apri12013