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Climax Molybdenum <br />A Freeport- McMoRan Company <br />Sent by Certified Mail <br />May 6, 2014 <br />Mr. Eric Scott <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman St. Room 215 <br />Denver, Colorado 80203 <br />Climax Mine <br />Highway 91 - Fremont Pass <br />Climax, CO 80429 <br />Phone (719) 486 -7718 <br />Fax (719) 486 -2251 <br />RE: Use of Tunnel Material for Barge Dike Raise, Addendum to TR -21 Mayflower Flood <br />Bypass Tunnel and Mayflower TSF Reclaim Water System Modification <br />Dear Mr. Scott, <br />This letter and attachments are an addendum to Technical Revision (TR) 21 — Mayflower Flood <br />Bypass Tunnel and Mayflower TSF Reclaim Water System Modification. As part of its reclaim <br />water system described in TR -21, Climax constructed barges to pump process water from the <br />Mayflower Tailing Storage Facility (TSF). Climax will complete a Barge Dike Raise project in <br />2014 to increase the height of the protective berm needed to prevent damage to the barges from <br />wave action. Attached Drawing 820 -C -2002 shows the Barge Dike Raise, which consists of raising <br />the existing dike approximately 20 feet vertically using approximately 42,300 cubic yards of fill. <br />Attached Drawing 820 -C -2003 shows the locations of the Barge Dike and proposed borrow sources <br />for construction of the raise. We plan to potentially use up to approximately 30,000 cubic yards of <br />material from the Mayflower Tunnel muck pile at the southwest corner of the Mayflower TSF. We <br />also may use cap material from the 5 -Dam beach that needs to be removed prior to tailing placement, <br />as well as material from the nearby barge area laydown yard. Since these materials are already <br />incorporated into the Mayflower TSF footprint, we do not see any environmental or other concerns <br />with using this material. <br />Please accept this letter and attachments as an addendum to TR -21 for your files. Climax also will <br />maintain this information with our copies of TR -21. <br />Sincerely, <br />Raymond Lazuk <br />Environmental Manager <br />attachment <br />lk?c <br />D1Vi MAY 0 8 7014 <br />S /pN <br />MiNjNGANps� �4r /oN <br />ry <br />