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® Climax Molybdenum <br />A Freeport-McMoRan Company <br />Sent by Email <br />June 11, 2018 <br />Mr. Eric Scott, Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 20203 <br />Re: ETDL Pipeline — Climax Mine Permit No. M-1977493 <br />Dear Mr. Scott: <br />Climax Mine <br />Highway 91 - Fremont Pass <br />Climax, CO 80429 <br />Phone (719) 486-7718 <br />Fax (719) 486-2251 <br />This letter provides additional information regarding the ETDL pipeline that you requested. The ETDL is <br />a reinforced concrete pipe used to convey slightly acidic mine drainage from 5 -Shaft and Storke <br />Wastewater Pump Station to the Climax process water/water treatment system. The ETDL is an <br />Environmental Protection Facility (EPF) described in Section T-5.3.2 of the Climax Environmental <br />Protection Plan (EPP) submitted to DRMS as TR -24. Climax discovered a small leak from a pipe joint <br />seal the afternoon of June 5 during a routine inspection of the area. Climax repaired the pipeline seal the <br />morning of June 6 with an oakum plug, which immediately stopped the leakage. Climax notified you of <br />the situation by voicemail the evening of June 5 and followed up with a phone call and detailed email the <br />next day. <br />Climax estimated the leakage rate to be about 1-2 gallons per minute (for a total of approximately 2,000 <br />gallons) which flowed into the East Side Channel that runs parallel to the ETDL. The East Side Channel <br />also is an EPF described in the EPP (Section T-5.3.2) as follows: "This channel collects seepage and run- <br />off from the Camp/Mill area and serves as a secondary containment for potential releases from the TDL <br />and ETDL pipelines." Like the ETDL, the East Side Channel conveys mine drainage to the Climax <br />process water/water treatment system. Given the redundancy provided by the ETDL/East Side Channel, <br />there was no release of water outside of the permitted containment system for the ETDL. <br />Inasmuch as the leakage was contained and conveyed to treatment in accordance with the design of the <br />ETDL/East Side Channel EPFs, we believe the containment system worked as intended and that there was <br />no failure or imminent failure of the system. The prompt identification and repair of the pipeline also <br />demonstrates that our protective measures including routine inspections and immediate attention to <br />maintenance of our pipelines also continue to be effective. <br />Please feel free to contact me at (719) 486-7584 or at rlazuk fmi.corn if you need any further <br />information regarding this matter. Thank you for your continued assistance with Climax Mine. <br />Sincerely, <br />Raymond Lazuk <br />Environmental Manager <br />