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0JR4Y SILVER MINES <br /> 5. Expected concentrations of chemicals and process solution volumes are not stated. Please <br /> provide this information in accordance with Rule 6.4.21(5)(b). <br /> All chemicals used in the milling process will be diluted in the mixing tanks to less than or equal to <br /> nominally 10%volume(Areophine 3418A,Area 242, Oreprep 549)or 10%by weight(Zinc Sulfate, <br /> Sodium Metabisulfite, Lime, Copper Sulfate,Sodium Isopropyl Xanthote, FlocAF-309). The volume of the <br /> mixing tanks are provided in Table 5. Please see Table 6 for reagent dosing rates. <br /> 6. Please provide the anticipated residual concentrations of chemicals in the tailings and <br /> concentrated ore, Pursuant to Rule 6.4.21(5)(b) and 6.4.21(6)(c). <br /> No data is available to state residual concentrations of chemicals in the tailing and concentrate. The <br /> mine contacted the chemical manufacturer and they do not collect any information on residual <br /> concentrations in tailings or concentrate. It is anticipated that there will be negligible amounts of <br /> residual chemicals found in the tailings as the mill chemicals are designed to attach to sulfides which will <br /> enter the concentrate. The mine's estimates that 90%of collectors will be retained in the concentrate, <br /> with less than 10%going to tailing, and the remainder are in recirculating process water. Other reagents <br /> are designed to remain in the process water recirculation, except for lime which is used for pH <br /> adjustment only. Once the mill is producing,further analysis of reagent use and destination will be <br /> needed to optimize the process and will be addressed with the Division as part of mill certification. <br /> 7. The MSDS for Sodium Metabisulfite was not provided in Appendix 2 as required by Rule <br /> 6.4.21(5)(c). Please provide the MSDS. <br /> See attached SDS for Sodium Metabisulfite <br /> 8. The MSDS for Copper Sulfate from Old Bridge Chemicals is not the most current version <br /> available. Please provide the most accurate up to date MSDS per Rule 6.4.21(5)(c). <br /> See attached SDS for Copper Sulfate <br /> 9. The MSDS for Hydrated Lime Type N produced by Ben ntag Pacific Inc. cannot be found on <br /> the manufacturer's website. Is this still the current provider of this chemical or is a <br /> different provider being used?If so, provide the manufacturers specific MSDS. - Pursuant <br /> to Rule 6.4.21(5)(c) <br /> See attached SDS for Lime <br /> 10. Commit to only storing a chemical within its designated area as shown on drawing 700- <br /> GA-001. Specifically, chemicals will be immediately offloaded from the transport vehicle <br /> into its designated storage space. Chemicals may not be stored in common areas awaiting <br /> future handling or putting away. - Pursuant to Rule 6.4.21(6)(b)(i) <br /> 31 Page <br />