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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 /> RECEIVED <br /> February 16, 2017 FEB 2 7 2017 <br /> UPS Tracking #: 1Z 804 847 01 7576 0542 <br /> DIVISION OF RECLAINAT(oN <br /> MINING&SAFETy <br /> Mr. Peter Hays <br /> State of Colorado <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 February 15, 2017. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on January 16, 2017, with a pH <br /> value of 6.2 standard units (s.u.). This exceeded the numeric protection limit(NPL) of 6.5-8.5. As required <br /> by the Groundwater Management plan, a follow-up pH measurement was taken within 30 days, on <br /> February 2, 2017, resulting in a pH of 6.3 s.u. <br /> These results do not appear to be anomalous, or obvious outliers. Henderson is currently working on <br /> further evaluation of the pH trends and the underlying water chemistry. <br /> If you have any additional questions or concerns, please feel free to contact me at 720-942-3518. <br /> Sincerely, <br /> 7-7 <br /> Tim Haynes <br /> Sr. Environmental Engineer <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 />