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Three Bells Mine Second Stability Review Memo <br />Page 2 of 2 <br />January 28, 2015 <br />Critical Section, Worse Case Scenario <br />1. The Applicant's cross section was duplicated for verification with the addition of stockpile <br />loading as indicated on the Ditullio Mine Plan Map. No potential failure surfaces with a <br />lower factor of safety than the Applicant's identified critical slip circle were located. The <br />safety factor produced by Galena is slightly higher than that produced by Slope -W 2012. <br />This is due to slight programming differences in the software packages and is not significant. <br />Therefore, the accuracy of the Applicant's analysis is confirmed. A copy of the Galena <br />model is attached. <br />Maximum Section, Post Reclamation <br />2. The Division attempted to duplicate the Applicant's cross section for verification, however <br />due to limitations of the Galena software the configuration could not be duplicated by the <br />Division. The Division will accept the Applicant's slope stability analysis for the slope liner <br />due to the high factor of safety produced by the Applicant's model. <br />If you have any questions, please contact me at (303) 866 -3567 Ext. 8124. <br />Sincerely, <br />Peter S. H <br />Environmental Protection Specialist <br />Cc: Tom Kaldenbach, Division of Reclamation, Mining & Safety <br />