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UJRAY SILVER NI/.NES <br /> 20. Commit to providing SDS sheets of the bagged concentrated product being shipped out. Given <br /> that each load may be slightly different a general concentrate SDS sheet for each product type <br /> is acceptable. Copies of each individual bagged load should be retained on site for verification <br /> upon request of the Division. <br /> Response:An SDS must be created by the mine in order to ship concentrate per DOT regulations. Per the <br /> mine's contract with Trafigura bills of lading are always kept for each 100-ton lot shipped and will be <br /> available to the Division upon request. <br /> 21. The mill circuit as proposed only mentions the extraction of Lead and Zinc minerals from the <br /> ore body. In previous discussions with OSMI it was indicated that all minerals of value were <br /> to be removed. Please clarify what minerals are to be extracted within each circuit of the mill. <br /> Response: The Revenue Mill will produce lead, zinc,silver, gold, and copper. The lead concentrate that is <br /> generated from the lead circuit will contain lead, silver, gold, and copper. The zinc concentrate that is <br /> produced in the zinc circuit will have zinc and gold as well as small percentages(less than or equal to 1%) <br /> of silver, lead, and copper. <br /> Secondary/Tertiary Containment Structures <br /> 22. Details regarding the secondary containment structure(s). Include calculations <br /> demonstrating maximum containment volumes of each area, all equipment stored in that <br /> location, details regarding the sump systems and where they report to. <br /> a. Provide volumetric calculations of storage capacity of the Mill Tunnel and crusher <br /> gallery, including areas where the floor square footage has been increased by new <br /> rock cuts. <br /> Response:Please see Table 9 for details regarding the sump system. <br /> 23. In order to install new equipment several of the areas require new rock cuts to increase the size <br /> of that area. <br /> a. Include details regarding any epoxy or coatings required to create an impermeable <br /> secondary containment area. <br /> Response:All rock cuts were preexisting to this construction. <br /> a. All rock cuts occurred prior to current construction and are in the crusher or course ore bin and <br /> no reagents are present in this area. The area has been grouted to limit water infiltration. <br /> 24. Similarly in addition to secondary containment structures will the other new rock cut areas <br /> receive coatings to control possible infiltrating water? <br /> Response:See above response <br /> 611' �� � e <br />