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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 /> June 19, 2019 RECEIVED <br /> Delivered via UPS: 1Z 804 847 03 7484 8723 JUN 2 1 2019 <br /> Mr. Peter Hays <br /> State of Colorado DIVISION OF P,ECLAMATION <br /> Division of Reclamation, Mining and Safety MINING VI!D 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, down gradient 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 19th, 2019. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on May 20th, 2019, with a pH value <br /> of 6.0 standard units (s.u.) This exceeded the numeric protection limit(NPL) of 6 5-8.5. As required by the <br /> Groundwater Management plan, a follow-up pH measurement was taken within 30 days on June 14th, 2019, <br /> resulting in a pH of 6 1 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 720-942-3384 <br /> Sincerely, <br /> A'tLA� Lj� <br /> Alex Ungers <br /> Environmental Scientist <br /> Climax Molybdenum Company <br /> Henderson Operation <br /> cc (via email). <br /> M. Hamarat, Climax <br /> A. Hilshorst, Climax <br />