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April 2, 2013 <br />Dear Mr. Hays, <br />Climax Molybdenum <br />A Freeport - McMoRan Company <br />UPS Tracking: 1Z 804 847 13 7621 7392 <br />Mr. Peter Hays <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Climax Molybdenum Company, Henderson Mill, Permit No. M- 1977 -342 <br />Proposed Technical Revision No. 19, Barge Pump System Relocation <br />COLORADO OPERATIONS <br />Henderson Mine and Mill <br />P.O. Box 68 <br />Empire, CO 80438 <br />Phone (303) 569 - 3221 <br />Fax (303) 569 -2830 <br />RECEIVED <br />APR 0 3 2013 <br />Division of Reclamation, <br />Mining & Safety <br />Climax Molybdenum Company (CMC) is hereby submitting this request for a new Technical <br />Revision (TR -19) for the anticipated relocation of the existing Barge Pump Station (BPS) at the <br />Henderson Mill from its current location to approximately one mile to the north. The BPS and <br />associated infrastructure was approved by the DRMS under TR -14, and is also included as an <br />Environmental Protection Facility in the Henderson Operations Environmental Protection Plan <br />(TR -18). The BPS returns decanted water from the tailing impoundment to the East Branch <br />Reservoir, via a 26 -inch HDPE pipeline that follows the Ultimate Canal alignment to the <br />intersection of Ute Creek, then travels up and over a ridgeline into the East Branch drainage, <br />where it terminates at an energy - dissipation/bifurcation structure located on the northwestern <br />corner of East Branch Reservoir. <br />Under normal operating conditions, the BPS is periodically moved upgradient as tailing and <br />decant water pond levels increase over time. Recent deposition patterns and influx of fine <br />sediment load into the barge intake area at its current location, however, have created insufficient <br />draft-space and the potential to intake sediment -laden water. This scenario can impair the pumps <br />or cause premature wear due to increased abrasive characteristics of the water. <br />To address this, Henderson, in conjunction with W.W. Wheeler & Associates has developed the <br />attached plan to move the BPS approximately one mile to the north, which will require the <br />installation of 5,600 ft. of additional piping to a new barge channel, where the pump facility will <br />operate through the current anticipated life of mine. No major changes to the barge platform <br />itself will be made, and the BPS will continue to be maintained and operated as it is currently. <br />Additionally, power service lines will be extended from the existing location to the new location <br />and the existing transformer will be relocated to the upper extent of the barge channel. <br />