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COLORADO OPERATIONS <br /> Z. 0imaxMolybdenum Henderson Mine <br /> A Freeport-McMoRan Company 1746 County Road 202 <br /> Empire, CO 80438 <br /> Phone(303)569-3221 <br /> December 28, 2020 <br /> JAN <br /> Sent by UPS Tracking #: 1Z 804 847 03 4415 5144 DiVISfGf <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 /> 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. <br /> MNGW-1 was sampled during a normally scheduled monitoring event on November 23, 2020, with a pH <br /> value of 6.3 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 14, 2020, 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 720-942-3255. <br /> Sincerely, <br /> Miguel Hamarat <br /> Environmental Manager <br /> Climax Molybdenum Company <br /> Henderson Operations <br /> cc(via email): <br /> G. Niggeler, Climax <br />