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AECOM <br /> AECOM 303-694 2770 tel <br /> 6200 S Quebec St 303 694 3946 fax <br /> Greenwood Village,CO 80111 <br /> www.aecom.com <br /> June 6, 2019 <br /> Ms. Diana Kelts <br /> Mr. Samuel Saunders <br /> Climax Molybdenum Company-Climax Mine <br /> Highway 91 —Fremont Pass <br /> Climax, CO 80429 <br /> Subject: Rev 1 -Mayflower Tailings Storage Facility Placement of Spoils from Mayflower <br /> Flood Bypass Tunnel—Phase 2 Construction, Climax Mine, Permit No. M-1977-493 <br /> Dear Ms. Kelts and Mr. Saunders: <br /> AECOM, through its legacy company URS Corporation, serves as the Engineer of Record (EOR)for <br /> the Mayflower Tailings Storage Facility (TSF) at the Climax Mine, located near Fremont Pass <br /> Colorado. It is our understanding that DRMS has requested approval from the FOR of placing spoils <br /> excavated during the Mayflower flood bypass tunnel—Phase 2 construction along the right side of <br /> the Mayflower impoundment area. <br /> The material from the Mayflower bypass tunnel construction will be placed in the purple hatched area <br /> shown on the attached Figure 1 provided by Climax. This area is also part of a larger area <br /> designated for tree and topsoil removal this year as part of the continuing expansion of the Mayflower <br /> tailings impoundment. Therefore, there is little risk of trees entering pond due to the spoils placement <br /> activities. Considering this and reviewing current and potential future dam construction limits it is <br /> acceptable to place the spoils in the proposed area. <br /> General information and Closing <br /> AECOM represents that our services are performed within the limits prescribed by the Client in a <br /> manner consistent with the level and skill ordinarily exercised by other consultants under similar <br /> circumstances. No representation to the Client, expressed or implied, and no other warranty or <br /> guarantee is included or intended. <br /> Please do not hesitate to call us with any questions or comments. <br /> Sincerely, <br /> Lisa R. a ne, PE Richard R. Davidson, PE <br /> Project anager Senior Principal Engineer <br /> M\DCS\PROJECTS\WTR\60594681_CLX_19EOR\400_TECHNICAL\431_MAYFLOWER TUNNEL\2019 MAYFLOWER PLACEMENT OF MINE ROCK FROM <br /> TUNNEL—REV 1 O6_D6_2019 DOCX <br />