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NEWMONT <br /> GOLDCORR <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 study was split into two phases. Samples were selected for the Phase I and Phase II static <br /> and kinetic geochemical characterization testing based recent prospecting drilling holes and a <br /> review of the extensive site geochemical database. The Phase I testing consisted of static testing <br /> on 29 samples. The Phase I testing results were used as a baseline, along with the existing <br /> characterization data, for the selection of samples for comprehensive characterization testing. <br /> Twelve samples were selected for Phase II testing. Additionally, Phase 11 samples were selected <br /> to represent the overall population of life-of-mine waste rock. The twelve samples were subjected <br /> to the following tests; net neutralization potential net acid-generation, meteoric water mobility <br /> procedure and humidity-cells. <br /> Of the twenty-nine samples selected in Phase I study twenty-seven (ABA and mineralogical <br /> testing) had net acid-generating NNP values (less than 0 t CaCO3/kt). Of which seven had <br /> negative NNP values that were between -20.0 and 0 t CaCO3/kt, indicating that their potential to <br /> generate acidity is uncertain. Two samples had NNP values that are greater than zero but less <br /> than 20.0 t CaCO3/kt, demonstrating that the samples are net neutralizing. <br /> The Results of the Phase II testing differ noticeably within each rock-type. However, the results <br /> of the whole studies' AGP, ANP, and NNP distributions are similar across the rock-type groups. <br /> Seven of the twelve samples leaned towards acid generating while the other five were <br /> circumneutral neutral. Therefore demonstrating that acid-generating and acid-neutralizing <br /> materials are not specifically limited to rock-type. CC&V and ITASCA believe that the results of <br /> the Phase I and Phase II testing are sufficient to characterize the overall behavior of waste rock. <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 /> Cripple Creek&Victor Gold Mining Company Exhibit U <br /> Cresson Project Amendment 13 <br /> 16 <br />