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The Leadville Mill M1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-9 <br /> 4.2.3 LABORATORY <br /> Laboratory activities will include bulk density, screening, flOtatiGA, AA assaying and <br /> thickening testing. A Marcy bulk density scale will be used for bulk density testing. <br /> Both wet and dry screening will take place in the laboratory. Samples for screen test <br /> will be crushed and ground with laboratory scale equipment. Wet screen material will <br /> be dried in a microwave oven. Neither the bulk density A n tests FeqWiFe <br /> iAse Of reagent-,. <br /> fFeFn 50 100g wall be fleated usiRg small quantities Of Feagents alFeady en site. Afte-F <br /> Thickening test will be conducted using small amounts of environmentally friendly <br /> polyacrylactes. <br /> Sample preparation will also be performed in the laboratory.b <br /> 4.2.4 CHEMICAL REAGENT INVENTORY <br /> TROMMEL & CRUSHING CIRCUIT <br /> There are no chemicals or reagent associated with the trommel and crushing circuit. <br /> GRINDING & AGITATED LEACH CIRCUIT <br /> Unit consumption rates as well as daily and monthly reagent consumption is shown in <br /> Table 4-6. A small amount of copper sulfate will be kept on site for testing, although <br /> not required for the process <br /> TABLE 4-6: REAGENT CONSUMPTION, GRINDING &AGITATED LEACH CIRCUIT <br /> Consumption <br /> No. Reagent UnitRate Daily Monthly <br /> (lb/st) (Ibs) (tons) <br /> 1 Water-H2O 0.33 133 4,058 <br /> 2 Flocculant 0.02 8.00 0.12 <br /> 3 Lime-CaO 8.00 3,200 49 <br /> 4 Sodium Cyanide-NaCN 4.00 1,600 24 <br /> 5 Sodium Bisulfite-NaHS03 0.50 1 200 1 3.0 <br /> 6 Copper Sulfate-CuSO4 0 0 0.025 <br /> 7 Lead Nitrate-Pb(NO3)2 0.01 4.00 0.06 <br /> (1) Water consumption is reported in tons. <br /> 6 A1AR1Q16 <br />