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<br />Molybdenum <br />A Freeport-McMoRan Company <br />July 7, 2010 <br />Via Email and UPS Tracking #: 1Z 804 847 03 6447 1489 <br />Mr. Allen C. Sorensdh <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203 <br />COLORADO OPERATIONS <br />Henderson Mill <br />P.O. Box 68 <br />Empire, CO 80438 <br />Phone (303) 569-3221 <br />Fax (303) 569-2830 <br />RECEIVED <br />VJUL 08 2010 <br />Division - ; -"'flatlon, <br />fv Mining and Safety <br />L/ <br />Re: - Permit M-1977-342, Tailings Cyclone Construction Notification, Henderson Mill <br />Dear Mr. Sorenson: <br />Climax Molybdenum Company (CMC) is planning to install a cyclone bank off of the Tailings Delivery <br />Line. The main purpose of this cyclone bank is to separate a portion of the tailings into a fines <br />component and a coarse component. The coarse component will be directed to the beaches of the <br />Tailings Storage Facility with the expectation that a coarser grind will yield a steeper overall beach slope. <br />The steeper beach will increase water storage capacity in the tailings pond. <br />The cyclone bank will be constructed directly over the existing drop tower #9. During the summer <br />spigotting months, 30 to 40% of the tailings flow will be diverted to the cyclone bank. Cycloned overflow <br />material will be directed to the existing emergency cutout which reports to the south end of the tailings <br />impoundment pond. The coarser underflow will discharge into drop tower #9 and back into the existing <br />tailings delivery line. <br />As per our phone discussion on July 6, 2010, we understand that approval will not be required for the <br />construction of this facility, as it is process related. Please contact me at (303) 569-3221, ext. 1233 or <br />Bryce Romig.(ext. 1204) if you have any questions or concerns. <br />Sincerely, <br /> <br />Miguel Hamarat <br />Chief Environmental Engineer <br />Climax Molybdenum Company <br />Henderson Operations <br />CC: B. Romig, Climax <br />T. Haynes, Climax <br />C. Brown, Climax