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Response to DRMS Adequacy Review (1) -Cotter SR -11 Mine Reclamation Plan Amendment <br />As mining progresses, the waste rock will be dumped over the edge of the <br />berm around the top of the existing pad, expanding the pad as shown in <br />Figure C4. Once the pad is large enough to accommodate the surface <br />facilities and ore stockpile, they will be added as needed. <br />The waste pile will continue to expand in this manner until the crest has <br />reached the maximum extent. The slope of the waste rock pile as it <br />progresses will be at the angle of repose of the dump material; historically, <br />this has been approximately 1.5 H:1 V. The final slope of the waste rock pile <br />will be re- graded to a final grade of 3H: 1V. <br />4. Addressing Rule 6.3.3 (1) (fl -On page D -4, the exhibit states a sloped area of 5.34 acres <br />will be used for the waste rock pile. Please provide the Division with the maximum <br />anticipated thickness that waste rock will be placed. <br />The maximum anticipated thickness of the waste rock pile will be 50 ft. <br />5. Addressing Rule 63.3 (1) (f) - On page D -4, the exhibit states that ore will be piled up to <br />a workable stockpile. Please provide the Division with a maximum anticipated amount of <br />ore to be stockpiled at any given time as well as how long the ore stockpiles will remain <br />in place. <br />No more than 2,000 tons of ore will be stockpiled at any given time. The ore <br />will not be left on the pad for more than 180 days. <br />6. On page D -4 under item b, it is stated that the ore pad will consist of a clay liner. Please <br />speck the source of the clay proposed liner and specific design and construction of the <br />ore pad. <br />SPLP tests were conducted on the waste rock at the SR 11 mine. On the <br />basis of these tests, acid mine drainage from uranium mining in this area has <br />2 <br />