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® Climax Mine <br /> Climax Molybdenum <br /> Highway 91 - Fremont Pass <br /> Climax, CO 8 A Freeport-McMoRan Company Phone (719) 86 0418 <br /> Fax (719) 486-2251 <br /> May 22, 2019 RECEIVED <br /> Mr. Eric Scott MAY 2 4 2019 <br /> Environmental Protection Specialist <br /> Division of Reclamation, Mining and Safety DMSM OF RECLAMAT10H <br /> Department of Natural Resources MINING AND SAFETY <br /> 1313 Sherman St. Room 215 _Xa(j ffiof6 , 4 t i"o 4 <br /> Denver, Colorado 80203 <br /> RE: Climax Mine, Permit No. M-1977-493, Technical Revision 29—Adequacy Review <br /> Response <br /> Dear Mr. Scott, <br /> Climax Molybdenum Company—Climax Mine (Climax)has prepared a response to the item raised <br /> in the April 2, 2018 Adequacy Review letter in regard to Technical Revision 29. DRMS comments <br /> are in italics font, followed by the Climax response. <br /> Comment#1: These proposed modifications will be conducted on facilities that are considered <br /> Environmental Protection Facilities (EPFs) by the Division. As such, DRMS will require that the <br /> provided design drawings be signed and stamped by the Engineer of Record(EOR)for the facilities <br /> to be modified, as well as a commitment to submit similarly certified as-built reports upon <br /> completion. DRMS also will require notice when construction is to commence for the proposed <br /> work, so that in process inspections may take place. <br /> Response: Climax has attached stamped/signed construction drawings for the Mayflower Flood <br /> Bypass Tunnel—Phase II and soil excavation and stabilization for the future riser structure titled <br /> "Mayflower Flood Bypass Tunnel System, Phase II Tunnel—Construction Drawings" and <br /> "Mayflower Flood Bypass Tunnel, Phase II Vertical Intake Structure, Portal Construction Plans". <br /> TR-29 referred to a tower riser structure; however, construction drawings for that facility are not <br /> available at this point in time so those drawings will be submitted as a separate Technical Revision <br /> in early 2020. Once Phase II of the tunnel is complete, Climax will submit a certification for this <br /> facility from the EOR. <br /> Climax has also attached a memo titled"REV 0—Mayflower Tailings Storage Facility Leadoff <br /> Clarification, Climax Mine, Permit No. M-1977-493" from the tailings FOR clarifying that the <br /> addition of a fourth leadoff on the Mayflower Tailings Storage Facility(TSF)was always part of the <br /> planned development of the TSF, along with additional leadoffs in the future. Each year, Climax <br /> submits a certification for the TSF from the FOR for the previous year's construction and the <br /> additional leadoff will be included in the certification submitted for 2019. <br />