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Henderson Mill — Permit No. M-1977-342 <br />Technical Revision No. 28 <br />Original Number 3 Dam Regrade <br />The 3 Dam Reslope Project was approved as Technical Revision No. 28 to Mill Permit No. M-1977- <br />342 on April 10', 2017. The project is located at Climax Molybdenum Company's Henderson Mill in <br />Grand County. The project Involved regrading the 3 Dam slope which varied from 3.4HAV to <br />3.51-11V,to a uniform slope of 4:1(horizontal:vertical). The tailings material removed during the <br />excavation was placed in the area between the toe of the 3 Darn stepback and the 3 Dam crest on <br />both time north and south sides. <br />Henderson Mill substantially completed construction of the project on August 4. The project was <br />designed by AECOM. Modifications to the initial design have been reflected in the construction <br />record drawings signed and dated November 9, 2017. <br />AECOM provided part-time construction oversight of the project with construction by Henderson <br />Mill. The project was completed in general conformance with the approved design as submitted to <br />the Division of Reclamation, Mining, and Safety. The statement is based in part an information <br />provided by others. <br />Lisa R. Yenne, P.E <br />AECOM QOO i EGISTf� Date: November 9.2017 <br />p4; •Q,p,E YE�;��,FO <br />Colorado PE No. 35847;3 <br />.ate .• •' V� <br />