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<br /> <br />Wildcat Mining Corporation <br />May Day and Idaho Mine and Mill Application <br />112(d) Permit – Technical Revision No. 1 <br />May Day and Idaho Mine <br />M-1981-185 <br />Revised June 30th, 2016 <br />4 <br />When Phase 1 and Phase 2 construction activities are completed, Wildcat Mining <br />Corporation will initiate Chief portal and LDG maintenance activities. <br />2) Background <br /> <br />Historical mining activities constructed the Chief manway/ventilation portal (Chief) and <br />disposed run-of-mine rock in the LDG drainage channel. A portion of the drainage channel was <br />further disturbed in 2008 and 2009. In early 2010, a cease and desist order was issued to prohibit <br />any mining related activities, including operating equipment without written authorization from <br />DRMS, was issued. Additionally, in April of 2012, the U.S. Environmental Protection Agency <br />(EPA) also filed an order against Wildcat for the 2008-09 for disposing mine rock in LDG. <br /> <br />The Chief was modified in 2008-09. The Chief collapsed in the first quarter of 2009. Mountain <br />Man Surveying surveyed the Chief and run-of-mine disturbed drainage area in 2011 (Attachment <br />1-Figure 1-4). <br />In 2011, the Chief geotechnical characterization was conduct by R Squared, Inc. (Attachment 1) <br />and other contracts were initiated to formulate a Chief stabilization, and drainage restoration <br />plan. Utilizing the collected technical data, Wildcat submitted a CDRMS technical revision (TR) <br />in 2013 to stabilize the Chief and to restore LDG. <br />Technical contractors included: <br />• Mountain Man Surveying: (Map Base and As-built Preparation) <br />• R Squared, Inc.; (Geotechnical and Portal Stabilization Work Plan); and <br />• Manhard Consultants, LLC (Civil Engineers); (Technical Revision Development <br />including Drainage Channel design); <br /> <br />3) Approach <br />Project activities; <br />• Reviewed site aerial photographs; <br />• Prepared site specific topographic base maps; <br />• Reviewed and assessed geotechnical data; <br />• Conducted field slope measurements; <br />• Collected information to finalize rock installation and foundation and highwall <br />geotechnical testing procedures; <br />• Drilled geotechnical tests holes above and below the highwall; to identify conditions that <br />could influence portal stability;