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May Day Idaho Mine Complex 112 (d) Permit Application <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 />(d) Monitoring Systems <br />Tailings will be monitored during the mill optimization phase An operational <br />sampling program will be developed and submitted to Division prior to full mine <br />production. <br />A sump will be installed adiacent to the dry tailings' disposal location to collect and <br />evaluate leachate generation.. If leachate is generated, a sample will be analyzed to <br />determine if the leachate is toxic or hazardous. The leachate if it is generated will be <br />or recycled through the mill. <br />Surface water will be sampled on a quarterly basis as per Section 6.4.20(12) from the <br />following locations: <br />• Upper Little Deadwood Gulch (DW-1); <br />• Lower Little Deadwood Gulch(DW-2); <br />• Upper La Plata River (SW-1); <br />• Lower La Plata river (SW-2); <br />• Idaho Spring (IS-1); <br />• Wetlands (WL-1) and <br />• Augmentation Pond Water (if the pond is constructed) <br />Groundwater will be monitored from the discharge at the Idaho No. 1 adit as per Sections <br />6.4.20(12) and 6.4.20(19) and other well locations approved by the DRMS\. <br />(e) Release Response Procedures <br />The following release response procedures will be followed: <br />• Spilled areas will be contained with socks; <br />REVISED June S, 2011 <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />i