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COLORADO OPERATIONS <br /> ® Climax Molybdenum Henderson Mill <br /> A Freeport-McMoRan Company 19302 County Road 3 <br /> Parshall, CO 80468 <br /> Phone(303)569-3221 <br /> August 6, 2019 <br /> CF jV�� <br /> Via Email and UPS: 1Z 804 641 01 9642 8716 A(/G <br /> o <br /> DyV/g/Oly Mr. Peter Hays <br /> Division M/N/N�'of Reclamation, Mining and Safety DSAFSTY <br /> Er y ,, <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> Re: Follow-up Notice for Mill Water Leak at the Emergency Cutout, Permit No. M-1977-342 <br /> Dear Mr. Hays: <br /> Henderson Mill is providing this written follow-up notice to an in person notification made to you on <br /> Thursday, August 1, pursuant to Rule 8.1 and 8.2 of the DRMS Rules and Regulations. <br /> This notice is regarding a water leak from the Emergency Cutout pipeline. The Emergency Cutout (ECO) <br /> is part of the Tailings Delivery System EPF and is an alternative, emergency use pipeline,which can convey <br /> tailings to the Henderson Mill tailing storage facility(TSF) in the event the Tailings Delivery Line(TDL)can't <br /> be used. It may also be used as a mill water conveyance when inspections of the TDL and droptowers are <br /> conducted. <br /> On August 1, 2019, mill water flowing through the TDL was diverted to the ECO at approximately 7:05 AM <br /> to allow for an annual inspection of the TDL and associated droptowers. At 7:08 AM water was seen flowing <br /> from a pipe joint in the ECO just below the splitter box and valve that is used to divert flow from the TDL to <br /> the ECO. Employees immediately began the process necessary to return the water flow to the TDL and at <br /> 7:15 AM the ECO was isolated, stopping the leak. The water that leaked from the ECO was fully contained <br /> in the ditch running along the TDL access road, flowed through a culvert underneath County Road 3, and <br /> ultimately ended up in the Henderson Mill TSF. At this time the Environmental Department was notified. <br /> The following paragraphs correspond to the elements of the follow-up written notice set forth in Rule 8.2.3, <br /> paragraphs (a) through (e), of the DRMS Rules and Regulations: <br /> (a) After discovering the issue, Henderson employees immediately returned all mill water flow <br /> to the TDL, isolating the ECO. <br /> (b) The water flowing down the access road ditch to the TSF did not adversely impact human <br /> health; property or the environment.This is based on the known chemistry of the water and <br /> the location of the event. The water flowed from the location of the leak, down a drainage <br /> ditch, under County Road 3 and ultimately ended up in the Henderson Mill TSF. <br /> (c) The contact person for this event is: <br /> Aaron Hilshorst <br />