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Response to DRMS Adequacy Review (1) — Cotter JD -9 Mine Reclamation Plan Amendment <br />21. Page U -S (2) states that maps showing drill hole data are found in this exhibit. A map <br />showing drill hole data was not provided. Please submit 2 copies of a map that displays <br />drill hole data. <br />The statement that a drill hole map was included in the EPP is incorrect. Cotter <br />acknowledges that the JD-9 mine is a wet mine and the use of drill hole data is <br />unnecessary to support any conclusions in this regard. <br />22. Page U -13 states that a small spring near the mine portal discharges water from a <br />perched aquifer. Has this spring ever been sampled for water quality analysis? <br />This spring has been sampled and the results are reported in Table 3: Selected <br />Water Samples from the Mine Sumps and Portal Spring. The small spring near <br />the mine portal is designated as the "Portal Spring" in the table. <br />23. Please clarify the term 'RL" in Tables 3 and 4. <br />RL stands for Reporting Limit. <br />24. Regarding Table 4, the data collected on 412612007 should be omitted due to it not being <br />apart of the continuous data set. Furthermore, the values recorded for the sample are <br />outliers and drastically influence the average values listed in the table. Please provide a <br />revised Table 4 without the 412612007 data <br />A revised Table 4 eliminating data and adjusting the averages is included as <br />Attachment 9 <br />25. Page U -22 states "Water quality is poor as indicated by a sulfate level of 2160mg /L. " The <br />sulfate level mentioned factors the average with the data from the 412612007 sample and <br />is therefore not considered statistically viable. Please revise the statement with a level <br />without the influence of the 412612007 sample data <br />The statement will be revised to read, "Water quality is poor as indicated by a <br />sulfate level of 1484 mg/1." <br />7 <br />