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May Day Idaho Mine Complex 112 (d) Permit Application <br /> irritant. <br />Frother Store in closed containers. No acute toxicological No aquatic toxicity data. <br /> (to be stored in Zircon effects expected. Readily biodegradable. <br /> Containers) Moderate skin and eye <br /> irritant. <br />(b) Expected Concentrations, Process Solution Volumes and Fate <br />6.4.20(6) <br />The present milling plan describes the predicted amount of chemicals to be used per ton <br />of ore (Section 6.4.4a). Approximately 0.25 ton of water will be used for every ton of ore <br />milled. Based on the assumption that 0.25 ton of water weighs 227 kg, the following <br />concentrations are expected within the milling solution. <br /> lbs/ton rock kg/ton rock g/L solution <br />Sodium carbonate 3.0 1.36 6 <br />Sodium Silicate 0.25 0.11 1 <br />Surfactant 1.0 0.45 2 <br />Potassium amyl xanthate 15 6.82 30 <br />Sodium alkyl dithio hos hate 0.05 0.02 0.1 <br />Copper Sulfate 0.05 0.02 0.1 <br />Frother 0.10 0.05 0.2 <br />Approximately 3,000 gallons (395 ft) of solution will be contained within the mill tanks <br />at any one time. <br />The tailings are proposed to be disposed within dry, underground workings of the mine <br />(Section 6.4.20.1-9 21 and 3.1.7). The milling process calls for 75% recycling of water, <br />which will be achieved through the use of a filter press or suitable alternative eyeleftes <br />prior to dry tailings disposal. The combination of minimal water (less than saturation) <br />within the tailings and the lack of water within the disposal facility (see Section <br />6.4.20(19)) prevent any exposure pathway via leaching to groundwater to the <br />environment. This will be evaluated during the milling optimization phase during start- <br />up. Groundwater monitoring is outlined in Exhibit G. <br />(c) Material Safety Data Sheets (MSDS) <br />MSDS sheets are presented in Attachment T-l. <br />Designated Chemicals and Materials Handling <br />(a) Procedures for Disposal, Decommissioning, Detoxification, Stabilization <br />REVISED June 5. 2011 <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />4 <br />i