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Memo to W. Erickson 3 21 April 2010 <br />Geochemistry Review File No. M-1981-185 <br />14) Section 6.3.3(1)(m). Please provide locations of ground water monitoring. The applicant must <br />monitor for a yet-to-be determined period of time after mining ceases to ensure that there are no <br />adverse ground water or surface water impacts. <br />15) Page 36 of the Christensen report states that dewatering may be required in the future to extract <br />deeper ore. Will the phases of mining proposed in the current plan extend below the water level, or <br />will mining below the water level be proposed in a future amendment? If in the current phase, please <br />provide a plan for handling dewatering effluent. <br />16) Exhibit D, Reclamation Plan: Please provide details of the tailings encapsulation, both physically <br />and chemically. For any mine waste deposited underground, DBMS will require accelerated <br />weathering tests of the final product to assess the leaching behavior of the material. The results of the <br />testing must be made available for DRMS review before any tailings product deposition proceeds in <br />the underground. <br />17) What is the expected final water level in the underground workings after mining?