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Mine Rock Geochemical Analysis <br />Exhibit U — Attachment U -6 <br />several metals were based on a hardness value of 50 mg/L as CaCO3 as this was the value of the <br />potential receiving surface waters including Little Deadwood Gulch and the La Plata River. <br />Based on these results, the only analyte above any of the Basic Standards was Arsenic (0.0151 <br />mg /L) which was 10% above the Domestic Water Supply — Human Health Standard (0.01 <br />mg /L). <br />3.0 Implication for Water Quality <br />A positive Acid -Base Potential indicates potentially acid - neutralizing material (Skousen et. al., <br />2002). Based on the results of the Acid -Base Accounting, a near neutral to alkaline solution with <br />sufficient carbonate to neutralize any acid produced during weathering. <br />Arsenic was the only metal greater than a Basic Standard. This metal was only slightly above <br />the Human Health Standard Domestic Water Supply. The analytical results were based on <br />leaching with a weak acid. Given that surface water draining from the catchment is near neutral <br />to alkaline (R2 Incorporated, 2010), any water coming in contact with the mine rock is predicted <br />to have less of a leaching effect, and a lower arsenic value. <br />References <br />R2 Incorporated (2010) Surface water analysis in the vicinity of the Idaho and Mayday Mine <br />Permit Areas. Letter report prepared for Wildcat Mining Corporation dated May 28, 2010. <br />Skousen, J., Simmons, J., McDonald, L.M. and Ziemkiewicz, P. (2002) Acid - base accounting to <br />predict post mining drainage quality on surface mines. Journal of Environmental Quality, 31, <br />2034 -2044. <br />Sobek, A.A., Schuller, W.A., Freeman, J.R. and Smith J.M. (1978) Field and laboratory methods <br />applicable to overburden and minesoils. USEPA Report EPA - 600/2 - 78 - 054. <br />USEPA (2007) Test Methods for Evaluating Solid Waste, Physical /Chemical Methods. <br />Revision 6. http: / /www.epa.gov/ wastes / hazard /testmethods /sw846 /online /index.htm <br />Wildcat Mining Corporation <br />May Day Idaho Mine Complex — 112d Permit Application <br />Revised August 2011 <br />Exhibit U — Attachment U -6 <br />Page 3 of 3 <br />