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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 /> September 21, 2018 RECElVeD <br /> Delivered via UPS: 1Z 804 847 03 7410 1618 SEP 24?018 <br /> DIVISION OF <br /> Peter Colorado &WINCANDSAFE� <br /> State <br /> ON 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, 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 September 21st, 2018. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on September loth, 2018, with a pH <br /> value of 5.8 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 /> September 181h, 2018, resulting in a pH of 6.4 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 /> D r <br /> l� <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 />