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COLORADO OPERATIONS <br /> Henderson Mill <br /> A Freeport-McMoRan Company 19302 County Road 3 <br /> Parshall, CO 80468 <br /> Phone(303) 569-3221 <br /> May 12, 2020 <br /> Via Email and UPS: 1Z804641NT94017570 <br /> Mr. Peter Hays <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> Re: Follow-up Notice for Mill TDL Tailings Leak, Permit No. M-1977-342 <br /> Dear Mr. Hays: <br /> Henderson Mill is providing this written follow-up notice to a voicemail notification made to you on Friday, <br /> May 8, pursuant to Rule 8.1 and 8.2 of the DRMS Rules and Regulations. <br /> This notice is regarding a tailings leak from the Mill Tailings Delivery Line. The Tailings Delivery Line (TDL) <br /> is part of the Tailings Delivery System EPF and conveys tailings to the Henderson Mill tailing storage facility <br /> (TSF). <br /> On May 7, 2020, during a routine inspection a leak in the HDPE section of the TDL was discovered. A <br /> small amount of tailings was leaking out of the TDL and onto the TSF access road below County Road 3. <br /> While driving up to the diversion box to switch the flow to the Emergency Cut Out (ECO) pipeline a leak at <br /> the last drop tower above County Road 3 was noticed. The tailings that leaked from the TDL and drop <br /> tower were fully contained on the TDL access road and in the vicinity of the drop tower. It is estimated that <br /> 55 gallons of tailings leaked from the TDL on to the TSF access road and approximately 150 to 200 gallons <br /> from the drop tower. After the tailings were switched to the ECO, and all leaks ceased and it was at this <br /> 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 switched all tailings flow to <br /> Emergency Cut Out pipeline (ECO), isolating the TDL. <br /> (b) The tailings released onto the access road to the TSF and around the base of the drop <br /> tower did not adversely impact human health, property or the environment. This is based <br /> on the known chemistry of the tailings and the location of the events. The tailings from the <br /> pipeline leak flowed from the location of the leak, down the TSF access road, while the <br /> tailings from the drop tower leak remained at the base of the drop tower. <br /> (c) The contact person for this event is: <br />