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Climax Molybdenum <br />A Freeport-McMoRan Company <br />February 27, 2018 <br />Delivered via UPS: 1Z 804 847 03 7317 0902 <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 />COLORADO OPERATIONS <br />Henderson Mine <br />1746 County Road 202 <br />Empire, CO 80438 <br />RECEIVED Phone (303) 569-3221 <br />FEB Z 81018 <br />WSION OF RECLAMATION <br />MINING AND SAFETY <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 27th, 2018. <br />MNGW-1 was sampled during a normally scheduled monitoring event on February 51h, 2018, 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 201h, 2018, 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 720-942-3518. <br />Sincerely, <br />4, Y- r� <br />Tim Haynes <br />Chief Environmental Scientist <br />Climax Molybdenum Company <br />Henderson Operation <br />cc (via email): <br />M. Hamarat, Climax <br />A. Ungers, Climax <br />