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• <br /> • SSR <br /> MINING <br /> 11 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 Consulting <br /> Group (ITASCA), the results of which were shared with DRMS in September 2019. The results of <br /> the recent ITASCA study 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 II 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 had acid-generating net <br /> neutralization potential (NNP) values (less than 0 tons of calcium carbonate per kiloton [t <br /> CaCO3/kt]) of which seven had negative NNP values that were between -20.0 and 0 t CaCO3/kt, <br /> indicating that their potential to generate acidity is uncertain. Two samples had NNP values that <br /> are greater than zero but less than 20.0 t CaCO3/kt, demonstrating that the samples are net <br /> neutralizing. <br /> The results of the Phase II testing differ noticeably within each rock-type. However, acid <br /> generation potential (AGP), acid neutralization potential (ANP), and NNP distributions are similar <br /> across the rock-type groups in both studies. Seven of the twelve samples leaned towards acid <br /> generating while the other five were circumneutral neutral, therefore demonstrating that acid- <br /> generating and acid-neutralizing materials are not specifically limited to rock-type. CC&V and <br /> ITASCA believe that the results of the Phase I and Phase II testing are sufficient to characterize <br /> • Cripple Creek&Victor Gold Mining Company Exhibit U <br /> Cresson Project Amendment 14 <br /> 16 <br />