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<br />Cripple Creek & Victor Gold Mining Company Exhibit D Cresson Project Amendment 13 19 <br />4 HIGH GRADE MILL FACILITIES <br />No major changes to the HG Mill are anticipated under this Amendment 13. <br />4.1 Mill Reagents <br />No changes to the reagents used in the HG Mill are anticipated as part of Amendment 13. The reagents used in the HG Mill facilities are discussed below and further discussed in the Environmental Protection Plan located in Exhibit U. <br />Lime – Lime is used as a pH modifier prior to slurry entering the flotation circuit and the cyanidation leach circuit. Lime is delivered by truck in pellet form and stored as pellets in the lime silo. Lime is dissolved in lime slakers prior to use in the milling. <br />Potassium amyl xanthate – Potassium amyl xanthate is used as a flotation collector in the flotation tanks to collect and float the gold materials. The xanthate is shipped as a solid in 55-gallon barrels. Approximately four shipments of 20 tons per truck is shipped each year. The barrels are stored in a building adjacent to the HG Mill. The xanthate is added and dissolved in the flotation conditioning tank prior to entering the flotation tanks. The reagent breaks down during the process into non-toxic forms. <br />Dithiophosphate – Dithiophosphate is a reagent that is added to the flotation conditioning tank as a flotation modifier and combines with the xanthate to float the gold-bearing minerals. Dithiophosphate is shipped as a liquid in totes. Approximately four shipments occur per year with 20 totes per shipment. The totes are stored in a building adjacent to the HG Mill building. Dithiophosphate is consumed during the process. <br />Frother – Frother is a long chain alcohol which is used to form stable air bubbles for floating of the gold-bearing minerals in the flotation circuit. Frother is shipped as a liquid in totes. Approximately four shipments occur per year with 20 totes per shipment. The totes are stored in a neighboring building. Frother breaks down during the flotation process into non-toxic forms. <br />Sodium Cyanide – While not currently utilized in the mill process, a dilute sodium cyanide solution may be introduced into the mill process at the cyanidation leach tanks. Sodium cyanide is delivered to the site by truck in U.S. Department of Transportation (USDOT) approved containers as either liquid sodium cyanide solution or as solid sodium cyanide briquettes. Shipping containers are unloaded on a concrete apron west of the tanks. The concrete apron is curbed and graded to drain to a sump, in the event of a spill or leak during unloading. <br />The cyanidation tanks are located on the west side of the mill building within a concrete foundation with curbing. Tanks are fitted with bird mitigation measures such as netting. Bird balls have been