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Eric Scott <br /> June 16, 2017 <br /> Page 2 of 2 <br /> degrees where estimates of shear strength are about 20 degrees or less. The shear strength used in the stability <br /> analysis was measured in the laboratory with a remolded sample and compared to back-calculations of shear <br /> strength from headwall failures in the mine but neither approach accounts for site-specific variations in <br /> stratigraphy that can result in zones of shale and clay with very low strength. While the geologic conditions <br /> differ significantly at the Climax site from Dowd's Junction, the strength parameters used in the analysis of <br /> cross-sections shown at the Climax site should not be used out of context or for other cross-sections that <br /> do not have the same underlying geologic conditions,those being favorable geologic orientation and/or <br /> potential failures through multiple beds. <br /> In general,we concur with the analysis,methods and underlying assumptions used to establish long- <br /> term stability conditions at the Climax Mine Overburden Storage Facility. <br /> Thank you for the opportunity to comment on the slope stability analysis for this project. If you have questions <br /> or require further evaluation,please call us at 303-384-2654, or e-mail jlovekin@mines.edu. <br /> Sincerely, <br /> dvvw� . d \" <br /> Jonathan R. Lovekin,P.G. <br /> Senior Engineering Geologist <br /> and <br /> Kassandra O. Lindsey <br /> Geologist <br />