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C limaxMolybdenum <br />A Freeport- McMoRan Company <br />Sent by Certified Mail <br />January 20, 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: Disposal of Underground Mine Materials Within OSF, Addendpm to Technical <br />Revision 22 — OSF Designs and O &M Plan, Climax Mine Permit No. M- 1977 -493 <br />Dear Mr. Scott, <br />This letter is to follow -up on our verbal request to you of December 12, 2013 and your email <br />response of December 16, 2013 regarding placing mixed underground mine materials and waste rock <br />within our Overburden Stockpile Facilities (OSFs). The attached memo from our Mine Department <br />describes the types and volumes of underground materials we expect to encounter during the current <br />life of mine plan, and the likely effects of these materials on OSF stability. Given the very small <br />volumes of underground materials relative to overall OSF volume, we determined that these <br />materials would not create stability concerns at the OSFs. We also feel that, to further eliminate any <br />potential stability risk, these materials should be dispersed within the OSF complex rather than <br />concentrating them in central locations. <br />Please accept this letter and attachment as an addendum to TR -22 for your files. Climax also will <br />maintain this information with our copies of TR -22. As previously stated in our first addendum <br />letter to you of September 5, 2012, Climax Pit Operations also will segregate any material that is not <br />compatible with inert, solid waste (e.g., electrical equipment, containers, oily material, etc.) for <br />appropriate disposal off site. <br />Sincerely, <br />Raymond Lazuk <br />Environmental Manager <br />attachment <br />RECEIVED <br />JAN 2 2 2014 <br />Division of Reclamation, <br />Mining & Safety <br />