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After my review, please have Henderson provide the following information: <br />• Please have Henderson provide the additional stability analysis for the 1 Dam to ensure to the <br />Division that long-term stability will remain if material is borrowed from the 1 Dam benches. <br />• Please provide additional discussion and stability results for the 3 Dam Phase II buttress design <br />under static conditions to ensure a minimum factor of safety of 1.5 is met as stated under Section <br />30. <br />It is stated under the cover page for the proposed TR -32 application that a geotechnical <br />investigation was scheduled for June 2020 which could potentially result in minor modifications <br />to the geometry of the buttress. Please provide additional details of the June 2020 investigation (if <br />occurred) and whether this investigation will have an impact on the curreltly proposed Phase II 3 <br />Dam buttress design. <br />This concludes my review of Climax Molybdenum Company's 3 Dam, Phase II Buttress Design and <br />associated geotechnical stability analysis for the Henderson Mine. If you have any questions, feel free to <br />contact me. <br />Sincerely, <br />Zach Trujillo <br />Environmental Protection Specialist <br />(303) 866-3567 ext. 8164 <br />Zach.Trujillo@state.co.us <br />Henderson Mine Geotechnical Review Memo — TR -32 July 14, 2020 <br />