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Climax Mol bdenum COLORADO OPERATIONS <br /> ® Y Henderson Mine and Mill <br /> A Freeport-McMoRan Company P.O. Box 68 <br /> p p y Empire, CO 80438 <br /> Phone (303) 569-3221 <br /> REI - 30 <br /> May 28, 2020 JUN 0 2 2020 <br /> Sent Via UPS Certified Mail Tracking: 1 Z804641 NY90879432 DIVISION OF RECLAMATION <br /> MINING AND SAFETY <br /> Mr. Peter Hays <br /> Environmental Protection Specialist <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> Re: Climax Molybdenum Company, Henderson Mine, Permit No. M-1977-342 <br /> Technical Revision No. 29, 3 Dam Buttress Phase 1 <br /> Dear Mr. Hays, <br /> Technical Revision (TR) No. 29 to the Henderson Mine Permit No. M-1977-342 was approved by <br /> the Division of Reclamation, Mining and Safety (DRMS) on April 41h, 2018. This TR is for the phase <br /> I construction of a buttress on 3 Dam. On March 1711, 2020 Henderson submitted as-built drawings <br /> and engineering certification to the DRMS as required in the TR approval. Based on the DRMS <br /> adequacy review, additional clarification was requested on March 25th. This submittal includes <br /> responses to the DRMS comments. <br /> 1. DRMS Comment <br /> The construction drawing set submitted with the technical revision dated 912112017 <br /> labeled the cross-sections as 3N/11, 3A/10, 2NI10 and 219 from north to south on the <br /> Buttress Plan, Stage 1, Overall Site Plan map. The cross-sections on the As-Built <br /> Drawings Overall Site Plan map revision dated 10125119, labels the cross-sections as <br /> 3N/6, 3A/5, 2N/4 and 213 from north to south. Please explain the nomenclature <br /> discrepancy and revise the as-built drawings accordingly. <br /> Henderson Response <br /> Please note that the first number in the nomenclature is the study section and the second <br /> number is the drawing sheet number that the section detail is located on. For example, <br /> the label 3N/6 would refer to cross section 3N on page 6. This nomenclature is described <br /> in the legend of sheet 2 of the as-built drawings. Because the section details are on <br /> different sheets on the as-builts verses the construction drawings submitted on 9/21/2017, <br /> the nomenclature varies by page number reference. Note that the reference to the cross <br /> section number is consistent between the drawing sets, however the page number varies. <br /> Henderson believes this nomenclature is appropriate, so the as-built drawings have not <br /> been updated. <br />