Laserfiche WebLink
5k <br />F2: <br />=Climax Molybdenum <br />A Freeport-McMoRan Company <br />March 10, 2016 <br />Via Email and USPS Tracking #: 7015 0640 0000 4200 2171 <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 />Phone (303) 569-3221 <br />RECEIVED <br />/MAR 2 4 201E <br />DIVISION 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 March 1, 2016. <br />MNGW-1 was sampled during the normally scheduled triannual monitoring event on February 22nd, 2016, <br />with a pH value of 6.4 standard units (s.u.). This exceeded the numeric protection limit (NPL) of 6.5-8.5. <br />As required by the Groundwater Management plan, a follow-up pH measurement was taken within 30 <br />days, on February 22, 2016, resulting in a pH of 6.3 s.u. <br />Henderson performed a trend analysis and the results did not appear to be anomalous, or obvious <br />outliers. Henderson is currently working on further evaluation of the pH trends and the underlying water <br />chemistry. <br />As mentioned in the annual report, Henderson is currently in the process of preparing a memo regarding <br />the groundwater protection program associated with MNGW-1 at the Henderson Mine. This memo will <br />identify a path forward for the Division's review and input. <br />If you have any additional questions or concerns, please feel free to contact me at 720-942-3518 or <br />Miguel Hamarat at 720-942-3255. <br />Sincerely, <br />--1 <br />Tim Haynes <br />Sr. Environmental Engineer <br />Climax Molybdenum Company <br />Henderson Operation <br />