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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 /> RECEIVED <br /> August 10, 2021 <br /> AUG 12 2021 <br /> Via Email and UPS: 1Z8046410397417035 DIVISION OF RECLAMATION <br /> Mr. Peter Hays <br /> MININGAND SAFETY <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 /> August 6, 2021, pursuant to Rule 8.1 and 8.2 of the DRMS Rules and Regulations. This notice is regarding <br /> a tailings leak from the Mill Tailings Delivery Line (TDL). The TDL is part of the Tailings Delivery System <br /> EPF and conveys tailings to the Henderson Mill tailing storage facility (TSF). <br /> On August 6, 2021, during a routine inspection a leak in the HDPE section of the TDL was discovered. <br /> Approximately 150 to 200 gallons of tailings leaked out of the TDL and onto the TSF access road between <br /> the No. 1 Cutout and the 3-Dam crest, which is located below County Road 3. The tailings that leaked from <br /> the TDL was fully contained on the TDL access road. <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 /> the NO. 1 Cutout, thereby isolating the TDL above the leak. <br /> (b) The tailings released onto the access road to the TSF did not adversely impact human <br /> health, property or the environment. This is based on the known chemistry of the tailings <br /> and the location of the events. The tailings from the pipeline leak flowed from the location <br /> of the leak, down the TSF access road towards the crest of 3-Dam. <br /> (c) The contact person for this event is: <br /> Geoff Niggeler <br /> 19302 County Road 3 <br /> Parshall, CO 80468 <br /> Phone: 720-942-3631 <br /> (d) No monitoring or analyses were performed for this situation since the tailings from the TDL <br /> were not released off-site and did not impact any natural surface water body and has no <br /> potential to impact groundwater. <br />