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® Climax Molybdenum COLORADO OPERATIONS <br /> Henderson Mine <br /> A Freeport-McMoRan Company 1746 County Road 202 <br /> Empire, CO 80438 <br /> Phone(303)569-3221 <br /> April 26, 2016 RECEIVED <br /> Via Email and USPS Tracking #: 7015 0640 0000 4200 2256 <br /> 1✓APR 2 9 2016 <br /> Mr.'Peter Hays DIVISION OF RECLAMATION <br /> State of Colorado MINING AND SAFETY <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> Re: ✓Mine Groundwater NPL Exceedance Notification, Permit No. M-1977-342!/ <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 April 261h, 2016. <br /> MNGW-1 was sampled during the normally scheduled triannual monitoring event on April 14th, 2016, with <br /> a pH value of 6.4 standard units (s.u.). This exceeded the numeric protection limit (NPL) of 6.5-8.5. As <br /> required by the Groundwater Management plan, a follow-up pH measurement was taken within 30 days, <br /> on April 20th, 2016, resulting in another pH of 6.4 s.u. <br /> Henderson performed a trend analysis and the results did not appear to be anomalous, or obvious <br /> outliers. Henderson is currently working on further evaluation of the pH trends and the underlying water <br /> chemistry. <br /> As mentioned in the annual report, Henderson is currently in the process of preparing a memo regarding <br /> the groundwater protection program associated with MNGW-1 at the Henderson Mine. This memo will <br /> identify a path forward for the Division's review and input. <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 /> Tim Haynes <br /> Sr. Environmental Engineer <br /> Climax Molybdenum Company <br /> Henderson Operation <br />