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Permit M- 1977 -342 (Henderson Mine and Mill) <br />Proposed TR -22 — Mill TDL Structural Support Refurbishment/Droptower 15 & 16 Removal <br />difficult. Addition of this access point will further enhance Henderson's ability to inspect this <br />tower in future years. <br />Following the completion of the structural refurbishments, the second part of this project will <br />include the removal of drop towers 15 & 16, the two lowest towers in line. As was the case with <br />the removal of droptower 17, periodic removal of the energy dissipating drop towers will occur, <br />so long as TDL pressures can be appropriately managed. An additional set of drawings has also <br />been included with this request providing detail of the removal of all reinforced concrete pipe <br />(RCP) associated with the existing TDL. Once the droptowers and jointed RCP is removed, it <br />will be replaced with 297 feet of 42" HDPE pipe. At the upper end, this will connect to the base <br />of droptower 14. On the lower end, this will connect to the existing Number 1 cutout structure, <br />which is used upstream of the 3 Dam TDL infrastructure as an alternate route for tailing slurry <br />into the upper reaches of the tailing storage facility. <br />The above changes, once completed, will provide the TDL with additional structural integrity to <br />allow continued conveyance of tailing slurry through the current, expected life of Henderson <br />operations. <br />If you have any comments, questions or concerns regarding this project, please do not hesitate to <br />contact me at 720 - 942 -3518, Bryce Romig at 720 - 942 -3231 or Miguel Hamarat at 720 -942- <br />3255. <br />Regards, <br />Tim Haynes <br />Sr. Environmental Engineer <br />Freeport- McMoRan Copper & Gold <br />Climax Molybdenum Company <br />Henderson Mill <br />19302 County Road 3 <br />Parshall, CO 80468 <br />303 -569- 3221 x2284 <br />tim hayneskfmi.com <br />CC: B. Romig (CMC) <br />M. Hamarat (CMC) <br />File <br />Page 2 <br />RECEIVED <br />272014 <br />Division of Reclamation, <br />Mining & Safety <br />