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Mr. Tom Kaldenbach <br />April 5, 2013 <br />Page 6 <br />14. Please provide legible replacement pages for Figures 8 and 21 of Exhibit E. <br />Please see the attached Figure 5 and Figure 6; replacement pages for Exhibit E Figures 8 and 21 <br />respectively. <br />15. Please add to Exhibit E a plan for disposing the sand filter backwash waste (generated <br />during treatment of alluvial water) and the RO chemical cleaning waste. <br />The UIC Class V Injection Well Authorization issued by the Environmental Protection Agency to <br />Cotter will allow materials originating from the mine to be placed back into the mine, including <br />filter backwash and residuals from cleaning membranes. <br />16. DRMS will determine the amount of required financial warranty (reclamation bond) for AM- <br />04 after receiving your responses to this letter. <br />No response necessary. <br />17. To enable DRMS to publish on its Laserfiche imaging system the progress of reclamation <br />activities, please add to Exhibit E a commitment to submit to DRMS a reclamation report within <br />45 days after the end of each calendar quarter. Please include in each reclamation report the <br />following information from activities conducted in the previous quarter: <br />a. Installation of pumping and treating facilities, <br />b. Summary of pumping and water treatment activities, <br />c. Summary of ex -situ and in -situ treatment performance, <br />d. Summary of corehole and fracture sealing activities, <br />e. Summary of alluvial fill disposal activities, and <br />f Concentrations of constituents of concerns after alluvial fill is removed. <br />Please see Cotter's response to this comment, submitted to DRMS on September 21, 2012 in <br />reply to AM -04 adequacy review comments regarding accelerated dewatering and in -situ <br />treatment. Cotter will provide such a report, beginning in the third quarter of 2013, covering data <br />from the second quarter of 2013. Quarterly reporting will continue until written authorization is <br />received from DRMS to discontinue the reports. <br />18. Please add a statement to Exhibit E that explains IX regeneration waste or spent resin will <br />not be placed in the mine workings. <br />Cotter will not place IX regeneration waste or spent resin in the mine workings unless it has <br />received written authorization from DRMS to do so. <br />19. Please add to Exhibit E the details of the grouting program /incorporate the plans provided in <br />TR -20 into the AM -04 process. <br />During alluvial fill removal, Cotter will employ third -party grouting contractors, as needed, to <br />seal identified exploration core holes and natural conduits through which refilling mine pool <br />water could migrate to Ralston Creek. <br />20. Please add to Exhibit E a plan for installing a monitoring well in the alluvium beneath the <br />South Waste Rock Pile. <br />