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Climax Molybdenum <br />A Freeport-McMoRan Company <br />June 5, 2018 <br />Delivered via UPS: 1Z 804 847 03 7460 5011 <br />COLORADO OPERATIONS <br />Henderson Mine <br />1746 County Road 202 <br />Empire, CO 80438 <br />Phone (303) 569-3221 <br />RECEWD <br />JUN U U ZQ 10 <br />Mr. Peter Hays 0IV1810NOFRECLAMATI04 <br />State of Colorado [ WINGANDWETY <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 June 51h, 2018. <br />MNGW-1 was sampled during a normally scheduled monitoring event on May 22"a, 2018, with a pH value <br />of 6.3 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 41h, 2018. <br />resulting in a pH of 6.3 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 />Since,, <br />v� <br />Alex Lingers <br />Environmental Scientist <br />Climax Molybdenum Company <br />Henderson Operation <br />cc (via email): <br />M. Hamarat, Climax <br />A. Hilshorst, Climax <br />