Laserfiche WebLink
the historic mine features (e.g., Independence Mill Tailings) in the drainage between T -2 <br />and T -3. These tailings were stabilized and closed by CC &V in 2007. The water quality <br />impacts of this closure are expected to be positive in the long -run and result in the <br />reduction of sulfate concentrations, along with other constituents. <br />Compiled data and statistics for aluminum, manganese, and zinc, which are common <br />geochemical indicators in the Diatreme, are provided in Tables 4 -1, 4 -2, and 4 -3. The <br />water quality data indicate that aluminum and zinc concentrations have been low and <br />stable for the individual stations T -1, T -2, and T -3 since 1986, 1986, and 1994, <br />respectively. Manganese concentrations have been low and stable for T -1 and T -2 and <br />slightly elevated for T -3 since 1986, 1986, and 1994, respectively. Other trace metals are <br />analyzed as part of the monitoring program. Median values for cadmium, chromium, <br />copper, lead, mercury, nickel, selenium, and silver for T -1, T -2, and T -3 were less than <br />the analytical detection limits. Median arsenic values for T -1 and T -2 were less than the <br />analytical detection limit, while the median value at T -3 was 0.041 mg/L. Since the <br />Independence Tailings were stabilized and closed by CC &V in 2007, arsenic <br />concentrations at T -3 have been less than detection (2008 - 2011). Trace metal data are <br />provided in Tables 4 -1, 4 -2, and 4 -3. <br />The surface water at WCSW is characterized as calcium sulfate water. Table 4 -4 is a <br />summary of the water quality data. The median field pH and nitrate values in the North <br />Fork of Wilson Creek between T -3 and WCSW increase from 7.19 SU to 8.09 SU and <br />from 1.73 mg/L as N to 2.17 mg/L as N, respectively. Median sulfate values in the North <br />Fork of Wilson Creek between T -3 and WCSW decreased from 441 mg/L to 156 mg/L, <br />respectively. The City of Victor Wastewater Treatment Plant discharges to the creek <br />about halfway between T -3 and WCSW. <br />Compilation data and statistics for aluminum, manganese, and zinc, which are common <br />geochemical indicators in the Diatreme, for WCSW are provided in Table 4 -4. The water <br />quality data indicate low and relatively stable parameter concentrations for aluminum, <br />manganese, and zinc for WCSW since 1996. Other trace metals are analyzed as part of <br />the monitoring program. Median values for arsenic, cadmium, chromium, copper, lead, <br />mercury, nickel, selenium, and silver for WCSW were less than the analytical detection <br />limits. Trace metal data also are provided in Table 4 -4. <br />'Cripple Creek & Victor Gold Mining Company <br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2 <br />6 <br />