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Mr Peter Hays, DRMS <br />September 30, 2015 <br />(e) The investigation of this release is still underway. Initial speculation is that this may have <br />been the result of a plugging of the chute which transfers P2S5 to the Nokes mixing tank. <br />When exposed to moisture, P2S5 readily reacts to form H2S gas. There is also some <br />speculation that aqueous materials introduced into the mixing process could have been <br />avoided and their place in the overall process is currently being evaluated. A full <br />investigation and root cause analysis will be completed by Henderson management and <br />personnel involved over the next several weeks. A report of the findings on the root <br />cause analysis can be provided, if desired. <br />If you have any additional questions or concerns, please feel free to contact me at 720-942-3518 or <br />Miguel Hamarat at 720-942-3255. <br />Sincerely, <br />_'% _---,' <br />Tim Haynes <br />Sr. Environmental Engineer <br />Climax Molybdenum Company <br />Henderson Mill <br />CC (via email): <br />B. Romig, Climax <br />M. Hamarat, Climax <br />S. Deely, Freeport-McMoRan <br />N. Hall, Freeport-McMoRan <br />L. Decker, Gallagher & Kennedy <br />Page 2 <br />