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Environmental Protection Facility Certification <br />Henderson Mine — Permit No. M- 1977 -342 <br />Technical Revision 20 <br />TDL Drop Tower 17 Removal and Pipe Replacement Project <br />The Removal of Drop Tower 17 on the Henderson Tailing Delivery Line (TDL) and the <br />replacement of approximately 1,000 feet of TDL concrete pipe with HDPE pipe was <br />approved as Technical Revision No. 20 to Mine Permit No. M- 1977 -342 on September 4, <br />2013. This project is located at Climax Molybdenum Company's Henderson Mill in Grand <br />County. The project involved the demolition of the drop tower and the removal of <br />approximately 1,000 feet of concrete TDL pipe, and the installation of approximately 1,000 <br />feet of 42 -inch diameter HDPE pipe. <br />The Henderson Mill and contractors have substantially completed the construction of the <br />project and it has been tested and determined to be functional. Record Drawings of the <br />project are attached. The exception to this is that it was determined that the vent is not <br />currently required, but will be installed later if future tailing flow conditions indicate that it is <br />necessary. <br />Pursuant to Rule 7.3.2, the Professional Engineer that has signed and sealed below certifies <br />that the project was completed in general conformance with the approved design as <br />submitted to the Division of Reclamation, Mining, and Safety. This statement is based in <br />part on information that has been provided by others. <br />unuy// /z� <br />\��\\N PO REG1 11i1 <br />29123 • <br />° • 4": <br />21 �'s��4A�va�`�a <br />Steven M. Maly, P.E. el <br />W. W, Wheeler and Associates, Inc. <br />/2 <br />Date <br />rah VFr) <br />JAN 08 2014 <br />Division or iNvujamation, <br />Mining & Safety <br />