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JOHN ERICH RAUBER, P.E.,G.E. <br /> 6486 TIMBER SPRINGS DRIVE <br /> SANTA ROSA,CALIFORNIA 95409 <br /> November 10, 2017 <br /> May Day Idaho Mine Complex <br /> Colorado Division of Reclamation, Mining & Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> Conclusions regarding Off-Site Impacts <br /> May Day Idaho Mine Complex <br /> La Plata County, Colorado <br /> To Whom It May Concern: <br /> This letter presents our conclusions regarding impacts to potential off-site stability impacts in <br /> connection with the existing access road at the May Day Idaho Mine Complex in La Plata, <br /> County, Colorado (the Mine Site). We previously prepared a report entitled, "Rule 6.5 <br /> Geotechnical Stability Report, New Access Road, April 2, 2012" for the Mine site. This report is <br /> attached. As part of our geotechnical evaluations, we performed slope stability analyses to <br /> evaluate the stability of the access road. On the basis of our evaluations, we conclude that-there <br /> are no areas adjacent to the permit area where potential off-site stability impacts to significant <br /> man-made structures could occur. <br /> As presented in the report, no disturbance after a catastrophic event would impact significant <br /> structures within 200 feet of the property lines. At these locations, as shown on the project <br /> geologic map (Figures U-3 and U-4), there are no geologic structures or earthen facilities that <br /> have the potential impact offsite locations. The New Access Road ranges from five to 50 feet <br /> from the nearest adjacent parcel. Geotechnical evaluations described in the report suggest that <br /> the current and final cut slopes are stable. Even if the slopes failed, the calculated shape of the <br /> failure zone would still be over 40—45 feet from the nearest private property boundary. <br /> Thus the stability of any structures located within two hundred (200) feet of the mining operation <br /> or affected land in the vicinity of the section of the mine access road addressed in the <br /> geotechnical report will not be damaged by activities occurring at the mining operation. This <br /> includes the structures on a list provided by Sunrise Mining LLC and attached to this letter. <br /> If you have any questions, please contact the undersigned at (707) 496-4503. <br /> Sincerely, p�PD�U�F� <br /> U4�.• R1GH•9•;sFO <br /> 's° 26647 11 <br /> John Erich Rauber, P.E. � '; ;\' �cq <br /> Professional Engineer 266 p'<'c'••..••,..•�•�\� <br /> sSlON M_ <br /> Attachments <br />