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1 <br /> OURAY SILVER MINES <br /> e. Its known potential to affect human health, property or the environment, in <br /> accordance with Rule 6.4.2](5)(a); <br /> f. The expected concentrations, process solution volumes and fate of designated chemicals, <br /> pursuant to Rule 6.4.21(5)(b). <br /> Response: <br /> a. Polyfroth W20 is an alternative to OrePrep. It is used as a frothing agent used to create a stable <br /> surface for sulfide minerals to adhere. <br /> b. If used it will be stored in the MIBC frother area of the reagent room noted in 700-GA-001 <br /> c. No additional tanks are needed. This would be used as an alternative to OrePrep. <br /> d. This would be the same volume as OrePrep. Please see Updated Table 1. <br /> e. The known potential to affect human health and the environment are listed in the updated and <br /> attached Table 4. <br /> f. The concentrations,process solution volumes, and fate are the same as OrePrep. <br /> 7. Based on response to question XXX if new chemicals are being proposed, update the Emergency <br /> Response Plan and Materials Containment Plan to include these chemicals. The Material <br /> Containment Plan and Emergency Response Plan should include all primary and alternative <br /> chemicals to be used. Include the manufacturer name, physical state, storage location(s) and <br /> maximum volume to be stored on site within both plans. <br /> Response: The chemicals that the mine plans on starting the mill with are listed in the MCP and ERP <br /> that was included in the second adequacy review response.As the mine adds additional alternatives for <br /> reagent chemicals in the future, these documents will be updated accordingly. <br /> 8. In the case of an emergency are tanks available on site to collect liquid materials and store them on site <br /> until characterization comes back to determine disposal methods? <br /> Response: Yes, there are two 1000-gallon portable plastic tanks that will remain available and stored in <br /> a secure environment in case of an emergency. <br /> 9. With regards to table 6 and reagent dosing. Please provide a more detailed explanation of Table 6. <br /> What are the estimated dosing units (volume) of reagent(s) to be added per short ton (st/ton)of ore <br /> to be processed? <br /> Response: Table 6 has been updated to include the volume of dosing reagents being used in gallons and <br /> simplified to show only the total amount being used in the mill process. <br /> 10. Regarding chemical tracking. While this information is understood to be available at the Mine Office <br /> as part of normal business, the requested information should be submitted to the Division as a <br /> quarterly Milling Report to verify the amounts of Designated Chemicals used, and stored on site. <br /> This information is used to verify the sufficiency of containment volumes, volumes of chemicals <br /> used and accurate representation of what chemicals are on site from an Emergency Response <br /> standpoint. <br /> a. Please commit to submitting a Quarterly Milling Report that includes tons of ore <br /> 31Page <br />