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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 /> December 15, 2020AJ— <br /> _ <br /> Via Email and UPS Tracking #: 1Z8046410394639355 <br /> Mr. Peter Hays <br /> Division of Reclamation, Mining and Safety DIVISI^,I CF 7,2Ci.AVAT!" 1 <br /> 1313 Sherman St., Rm. 215 {°!`!!"."a"`.�'SAFEW <br /> Denver, CO 80203 <br /> Re: Follow-up on Henderson Mill Tailings Delivery Line Inspections, Climax Molybdenum <br /> Company, Henderson Operations, Reclamation Permit No. M-1977-342 <br /> Dear Mr. Hays: <br /> In a letter dated May 12, 2020, the Henderson Mill provided notice to the Division of Reclamation, Mining <br /> and Safety (DRMS) of a leak from the tailings delivery line (TDL) and one of the drop towers associated <br /> with the TDL that occurred on May 7, 2020. In that report, Henderson indicated that we had scheduled an <br /> inspection of the TDL for later in the summer to assess the integrity of the pipeline. This letter provides <br /> information regarding that inspection, which was carried out on September 23-24, 2020. <br /> Henderson completed the inspections of the TDL using both internal camera inspections and external <br /> thickness/visual inspections. The inspections showed that the TDL is generally in good condition, with <br /> wear at some of the joints, particularly where pipe sections were slightly misaligned at fused or flanged <br /> joints during installation, as shown in the photos below taken by a robotic camera from inside the pipeline <br /> (Figures 1 and 2). <br />