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Response to Geochemistry Review - May Day Conversion CN-1 <br />File No. M-1981-185 <br />Adequacy Issue #13 <br />A. Exhibit G - Water Information; Rule 6.4.7(4), Projected Water Sources, page 3. The <br />Applicant states that the source of water for the mill will be the Idaho Adit near Idaho <br />Portal No. 1. Fig. C-4 indicates that the Idaho Adit #1 is "currently closed with rock <br />pile." How is the applicant able to determine the existence of, and quantity of water <br />available from the adit in the closed condition? <br />B. Please explain the difference between the Idaho Adit and the Idaho Portal No. 1. <br />Response #13 <br />Response #13a <br />Water will be obtained from an area in close proximity to the historical Idaho Mill and <br />Portal. <br />Response #13b <br />The Idaho Adit and the Idaho Portal No 1 are considered to be the same point. <br />Adequacy Issue #14 <br />Exhibit T - Environmental Protection Plan; Rule 6.4.20(7)(a) [Rule 6.4.21(7)(a) under the Hard <br />Rock Rules effective Sept. 30, 2010], page 6. Please describe the process(es) that will be used to <br />prepare the tailings to "reduce the moisture available for leaching, and stored within a dry <br />underground workings." <br />Response #14 <br />Moisture will be removed from tailings using a vacuum or belt filter press (or suitable <br />alternative) After the tails have been treated, if moisture content is elevated (above <br />saturation limits) cement or suitable alternative will be added to stabilize the filter cake. <br />Adequacy Issue 415 <br />Exhibit T - Environmental Protection Plan; Rule 6.4.20(8)(b) [Rule 6.4.21(8)(b) under the Hard <br />Rock Rules effective Sept. 30, 2010], page 6. The information provided is not adequate to <br />describe or address potential impacts to groundwater resources as required by Rule 6.4.21(8)(b). <br />The depth to ground water is unknown except where ground water is observed in the <br />underground mine workings or where ground water emerges at the ground surface. Therefore, <br />the Office requires additional hydrologic testing and analyses to adequately characterize the <br />ground water regime. <br />May Day Idaho Mine Complex 112(d) Permit Application <br />Revised: April 14, 2011 <br />6