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NEWMONT <br /> GOLDCORA <br /> 12 GEOCHEMICAL DATA AND ANALYSIS <br /> An updated geochemical model for the entire site was provided to DRMS under the Amendment <br /> 11 permit amendment application (Amendment 11, December 2015). Prior studies have <br /> evaluated the acid-generating potential and acid-neutralizing potential of sulfur oxidation of the <br /> rock mass within the District. The environmental effects of weathering of overburden and exposed <br /> rock slopes were evaluated through detailed testing of rock samples from the District. A <br /> 2011/2012 study updated the regional hydrology and geochemistry of MLE2/Amendment 10 and <br /> was provided with the Amendment 10 application. An update to this study was performed in 2015 <br /> and provided additional information on the hydro-geochemical model for the site. A copy of the <br /> 2015 study was provided as Attachment 2 to the Amendment 11 application. In addition to prior <br /> testing, CC&V has conducted a recent waste rock characterization study with ITASCA, the results <br /> of which were shared with DRMS in September 2019. The results of the recent ITASCA study <br /> support the prior findings of previous evaluations. <br /> The geochemical evaluations also have included an analysis of the reasonable sources, probable <br /> fate, and transport mechanisms of metal and acid-producing minerals that may be mobilized <br /> during development and reclamation of the Cresson Project. <br /> Using the hydrologic and geochemical information developed for the District, an evaluation was <br /> conducted of the fate and transport of water infiltrating to the subsurface through mines, mine <br /> backfill, and OSAs. The results of the analysis were verified by checking against the observed <br /> behavior of the hydraulics and chemistry of the diatreme since Cresson Project surface mining <br /> began in 1993, using the measured vertical hydraulic gradients in and near the diatreme, and the <br /> flow rate and chemistry of the regional groundwater exiting the Carlton Tunnel portal. The results <br /> of the analysis indicate that no deleterious change in the average regional groundwater quality <br /> from the District will occur due to past, current or proposed operations. <br /> Cripple Creek&Victor Gold Mining Company Exhibit U <br /> Cresson Project Amendment 13 <br /> 15 <br />