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May Day Idaho Mine Complex 112 (d) Permit Application <br />. (c) Assessment of Potential Acid-Forming Materials <br />An assessment of the acid forming potential of the mine rock is presented in Section <br />6.4.20(14). Based on this assessment, a favorable Acid-Base Potential was reported <br />indicating potentially acid-neutralizing material. Specific tailings analysis will be <br />undertaken during mill optimization, as described in Section 6.4.20(7)(d). <br />6.4.20(7) Facilities Evaluation <br />(a) Site-Specific Conditions <br />The following site-specific conditions lead to favorable Environmental Protection: <br />• Small concentrations of designated chemicals are used at any time, <br />minimizing the impact of any accidental release of designated chemicals; <br />• All operations are undertaken in a contained space underground, allowing for <br />effective response to any release of designated chemicals and no off-site <br />migration; <br />• The designated chemicals are stored approximately 400 feet from a water <br />course; <br />• Groundwater is estimated to be 1,000 feet below the level of use and storage <br />of the designated chemicals (Section 6.4.20(8)); <br />• Tailings will be prepared to reduce moisture available for leaching, and <br />stored within a dry underground workings; and <br />• The mine rock has a greater degree of neutralizing capacity compared with <br />its acid generation potential. <br />(b) Materials Storage <br />Designated chemicals will be consumed during the milling process and will be contained <br />in the tails disposed of in underground workings. <br />Tailings will be stored in the underground workings following additional testing (Section <br />6.4.20(19)). <br />(c) Alterations to Naturally Occurring Geological and Geochemical Conditions <br />The site is located at the southwest region of the La Plata Mountains, a laccolithic type <br />mountain group produced by the domal uplift of sedimentary rocks intruded by igneous <br />stocks, dikes and sills (Eckel, 1949). The permit area is predominately sedimentary rocks <br />with mineralized zones in the form of limestone replacement or porphyry veins and <br />dykes. The existing conditions reflect historical mining activities occurring for over 100 <br />years and alterations to the naturally occurring geological and geochemical conditions are <br />not anticipated. <br />• <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />6