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May Day Idaho Mine Complex 112 (d) Permit Application <br />calcite neutralizes any such acid. Additionally, there is the potential for aluminum above <br />Chronic Aquatic Life Standards and arsenic above drinking water standards to be <br />generated by leachate from the tailings. <br />The tailings are planned to be placed within the dry stope within the May Day No. I <br />portal. Based on observations by Dr. David Gonzales, Fort Lewis College (pers. comm.), <br />there is no water within this stope, limiting leachate generation. Additionally, the tailings <br />will be managed such that 75% of the process water will be recycled, again limiting the <br />amount of leachate that potentially can be generated. <br />As there is no leachate being generated, there is limited fate of the materials. This will <br />be further evaluated during the milling optimization phase. <br />References <br />Christensen, O. (2007) Technical Report, May Day - Idaho Mine. Prepared for Wildcat <br />Mining Corp. <br />(e) Measure to Prevent Unpermitted Discharges <br />The following measures will be undertaken for handling of the tailings to prevent <br />unpermitted discharges: <br />• Inspection of stope area once access is granted to perform a thorough <br />investigation of water characteristics and the conditions of materials already <br />within the stope; <br />• The maximum tailings moisture content will be limited to 25% <br />• During the milling optimization phase, three tailings samples from initial 5,000 <br />yd3 tailings will be analyzed. The sample will be split. One split will be <br />submitted to a laboratory for analysis of Acid-Base Accounting and SPLP <br />analysis and one split will be archived. <br />• Following the interpretation of results during the milling optimization phase, a <br />sampling and monitoring program will be submitted to the Division for review. <br />6.4.20(15) Construction Schedule Information <br />(a) Designated Chemicals Facilities <br />No specific designated chemical facility will be constructed. Designated chemicals will <br />be stored in either a locked Conex or the locked mill. <br />The following modifications to the storage facilities will be completed prior to Milling <br />Optimization: <br />• Installation of berms around each of the storage facility to contain any spill; and <br />• Installation of a sump within the mill to collect any spill. <br />• <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />15