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® Climax MolybdenumCOLORADO OPERATIONS <br /> Henderson Mine <br /> A Freeport-McMoRan Company 1746 County Road 202 <br /> Empire, CO 80438 <br /> Phone (303)569-3221 <br /> December 20, 2019 RECEIVED <br /> Sent by UPS#: 1Z8046412597502731 DEC �'1 a 2019 <br /> Mr. Peter Hays DIVI61ON OF RECLAMATION <br /> State of Colorado MININGAND 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, 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 December 20, 2019. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on December 3, 2019, 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 /> December 17, 2019, resulting in a pH of 6.2 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 720-942-3420. <br /> Sincerely <br /> Aaron Hilshorst <br /> Chief Environmental Engineer <br /> Climax Molybdenum Company <br /> Henderson Operations <br /> cc(via email): <br /> M. Hamarat, Climax <br />