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NEWMONT <br />GOLDCORP.. <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 <br />reagents used in the HG Mill facilities are discussed below and further discussed in the <br />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 <br />leach circuit. Lime is delivered by truck in pellet form and stored as pellets in the lime silo. Lime <br />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 <br />tanks to collect and float the gold materials. The xanthate is shipped as a solid in 55 -gallon barrels. <br />Approximately four shipments of 20 tons per truck is shipped each year. The barrels are stored in <br />a building adjacent to the HG Mill. The xanthate is added and dissolved in the flotation conditioning <br />tank prior to entering the flotation tanks. The reagent breaks down during the process into non- <br />toxic forms. <br />Dithiophosphate — Dithiophosphate is a reagent that is added to the flotation conditioning tank as <br />a flotation modifier and combines with the xanthate to float the gold -bearing minerals. <br />Dithiophosphate is shipped as a liquid in totes. Approximately four shipments occur per year with <br />20 totes per shipment. The totes are stored in a building adjacent to the HG Mill building. <br />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 <br />the gold -bearing minerals in the flotation circuit. Frother is shipped as a liquid in totes. <br />Approximately four shipments occur per year with 20 totes per shipment. The totes are stored in <br />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 <br />may be introduced into the mill process at the cyanidation leach tanks. Sodium cyanide is <br />delivered to the site by truck in U.S. Department of Transportation (USDOT) approved containers <br />as either liquid sodium cyanide solution or as solid sodium cyanide briquettes. Shipping <br />containers are unloaded on a concrete apron west of the tanks. The concrete apron is curbed and <br />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 <br />with curbing. Tanks are fitted with bird mitigation measures such as netting. Bird balls have been <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Amendment 13 <br />19 <br />Exhibit D <br />