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COLORADO OPERATIONS <br /> ® Climax Molybdenum Henderson Mine <br /> A Freeport-McMoRan Company 1746 County Road 202 <br /> Empire, CO 80438 <br /> Phone(303)569-3221 <br /> June 16, 2017 RECEIVED <br /> Delivered via Certified Mail: 7016 2070 0000 4713 5096 JUN 19 2017 <br /> ION Mr. Peter Hays DNISMINING&SAFETYECLAMAT ICN <br /> State of Colorado <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> /r <br /> Re: Mine Groundwater NPL Exceedance Notification, Permit No. M-1977-3 <br /> Dear Mr. Hays: <br /> Henderson Mine is providing this written notification of an NPL exceedance for pH at groundwater point of <br /> compliance (POC)well MNGW-1, downgradient of the Henderson Mine, in accordance with Section 5.3 of <br /> the Henderson Groundwater Management Plan. This written notification is follow-up to the verbal <br /> notification that was made to you via voicemail on June 16th, 2017. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on May 25th, 2017, with a pH value <br /> of 6.3 standard units (s.u.). This exceeded the numeric protection limit (NPL) of 6.5-8.5. As required by <br /> the Groundwater Management plan, a follow-up pH measurement was taken within 30 days on June 7tn <br /> 2017, resulting in a pH of 6.3 s.u. <br /> These results do not appear to be anomalous, or obvious outliers. If you have any additional questions or <br /> concerns, please feel free to contact me at 720-942-3518. <br /> Sincerely, <br /> .f <br /> ;77 <br /> Tim Haynes <br /> Chief Environmental Scientist <br /> Climax Molybdenum Company <br /> Henderson Operation <br /> cc(via email): <br /> M. Hamarat, Climax <br /> W. Koester, Climax <br /> T. Haynes, Climax <br /> A. Parmet, Climax <br />