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Environmental Protection Plan, Schwartzwalder Mine <br />14-10 <br />• Table 148. Effect of pH and Eh on Controlling Mineral Phases <br />Mineral Composition Saturation Index <br />June 27, 2007 Saturation Index <br />lower pH Saturation Index <br />lower Eh <br />pH -- 7.53 6.85 7.53 <br />Eh -- 23 23 -25 <br />Charge Balance -- -2.46 -2.45 -2.46 <br />Al(OH)3 (am) Al(OH)3 -0.94 -.051 -0.91 <br />Barite BaSO4 0.64 .064 0.64 <br />Calcite CaC03 0.77 0.1 0.74 <br />CaM04 CaM04 0.23 0.23 0.23 <br />Cerrusite Pb(C03) -0.35 -0.65 -0.36 <br />C02 as C02 -1.99 -1.3 -1.96 <br />Ferrihydrite Fe(OH)3 -1.01 -3.05 -1.91 <br />Gypsum CaSO4.2142O -0.18 -0.18 -0.18 <br />Magnesite MgC03 -0.06 -0.73 -0.09 <br />Rhodochrosite MnC03 0.85 0.17 0.82 <br />Uraninite U02 -1.7 0.26 0.01 <br />Positive values are oversaturated; negative values are undersaturated <br />The geochemical modeling results suggest that the trend of decreasing uranium and molybdenum <br />concentrations in the flooded mine water are related decreasing Eh. The pH is circum-neutral and the <br />flooded mine water is well buffered (394 mg/L alkalinity). With the exception of iron and manganese, the <br />observed concentrations of trace metals in the flooded mine water have been stable over time. <br />• <br /> <br />4109C.100731 Whetstone Associates •