Laserfiche WebLink
Climax Molybdenum <br />A Freeport- McMoRan Company <br />April 6, 2015 <br />Via Email and UPS Tracking #: 1Z 804 847 03 7745 7622 <br />COLORADO OPERATIONS <br />Henderson Mine <br />1746 County Road 202 <br />Empire, CO 80438 <br />Phone (303) 569 -3221 <br />RECEIVED <br />APR 0 7 2015 <br />ID; DVISION OF RECLAMATION <br />Mr. Peter Hays <br />MWMAND SAFETY <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203 <br />Re: Henderson Mine Point of Compliance Low pH Status Update, Permit No. M- 1977 -342 <br />Dear Mr. Hays: <br />Climax Molybdenum Company, Henderson Mine is providing this status update regarding low pH <br />measurements observed at point of compliance (POC) monitoring well MNGW -1 beginning in 2012. <br />Per the July 11, 2013 and December 30, 2013 correspondence on this issue, Henderson continued monthly <br />monitoring of indicator parameters through 2014, and installed two (2) additional monitoring wells (MNGW- <br />3 and MNGW -4) to further assess the hydrogeology and groundwater quality downgradient of the mining <br />operations. <br />Based on the recommendations provided by AJAX and Clear Creek Associates in the attached letter, <br />Henderson intends to: <br />• Continue monthly monitoring of field parameters and water level at MNGW -1, MNGW -3 and <br />MNGW -4, as well as in No Name Gulch (NNG -50) when flowing; <br />• Perform triannual analytical monitoring to assess water quality at MNGW -3 and MNGW -4; and <br />• Provide an update assessment report to DRMS by December 31, 2015, once sufficient monitoring <br />data is available. <br />If you have any additional questions or concerns, please feel free to contact me at (720) 942 -3255. <br />Sincerely, <br />A'�� fi-r-� <br />Miguel Hamarat <br />Chief Environmental Engineer <br />Climax Molybdenum Company <br />Henderson Operations <br />Attachments (1) <br />