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. Molybdenum <br /> Qnr r COL.ORADO OPERATIONS <br /> ® �1>t 1 /�of ybde um Henderson Mill <br /> A Freeport-McMoRan Company 19302 County Road 3 <br /> Parshall, CO 80468 <br /> Phone(303)569-3221 <br /> RECFIVFI) <br /> May 10, 2016 -' MAY 13 2016 <br /> Certified Mail#: 7015 0640 0000 4200 2263 DVISION OF RECLAMATION <br /> NMG AND SAFETY <br /> Mr, Peter Hays <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Rm. 215 <br /> Denver, CO 80203 <br /> Re: c,'Follow-up Notice for 3-Dam Seepwater Collection System Release, Permit No. M-1977-342 <br /> Dear Mr. Hays: <br /> Henderson Mill is providing this written follow-up notice to a phone call made to you on May 3. 2016 at <br /> pursuant to Rule 8.1 and 8.2 of the DBMS Rules and Regulations. <br /> This notice is regarding a release of water originating from the 3-Dam process water, which was <br /> inadvertently released from an engineered overflow. The release incident was discovered on June 3, <br /> 2016 at approximately 10:00am. While driving by the area this system is located at, personnel noticed <br /> that the system was off. Upon further investigation, the seep collection system was found to be <br /> overflowing from the upper vault(Image 2) into a wet area (Image 3) where it had previously run, prior to <br /> system construction. The cause of this issue was due to a pump in the lower vault (Image 1) which had <br /> reached its operational life. It was unclear how long the system had been overflowing since native waters <br /> also run into this area and infiltrate, and since run-off has started in the area, sheet surface flow is very <br /> prevalent, at present. By 3pm the day this issue was discovered, a new pump had been installed, and <br /> the system was returned to normal operation, with no additional overflow reported. <br /> The following paragraphs correspond to the elements of the follow-up written notice set forth in Rule <br /> 8.2.3, paragraphs(a)through (e), of the DRMS Rules and Regulations: <br /> (a) After discovering the issue, Henderson employees immediately began preparing a pump <br /> for installation that had arrived the day before. It was awaiting a proper wiring <br /> configuration prior to installation. <br /> (b) The water release did not adversely impact human health, property or the environment. <br /> This is based on the known chemistry of the water and the location of the event. Water <br /> ran from the overflow to a pre-existing wet area where the material had once flowed, and <br /> prior to system construction. At no time did any impacted water flow from the property or <br /> impact waters of the United States. <br /> (c) The contact person for this event is: <br /> Tim Haynes <br /> 19302 County Road 3 <br />