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COLORADO OPERATIONS <br /> ® Climax Molybdenum 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 /> Fax (303) 569-2830 <br /> June 18, 2020 <br /> RECEIVED <br /> Delivered via email and UPS Tracking: 1 Z804641 NT93078533 JUN 2 <br /> 3 ZOZO <br /> Peter Hays DIVISION OFREC <br /> MINING AND S FMATIQ{y <br /> Environmental Protection Specialist ETY <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 4th, 2018. This TR is for the phase <br /> I construction of a buttress on 3 Dam. On March 17th, 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. Henderson provided the <br /> additional clarification on May 28th. <br /> Based on the second DRMS adequacy review, a hard copy of the stamped drawings was <br /> requested on June 10th. In a follow up email, the DRMS indicated that the electronic copy of the <br /> drawings had the Professional Engineer's Stamp, however the hard copy drawings did not include <br /> the stamp. Attachment 1 includes the hard copy of the stamped drawings. <br /> If you have any additional questions, concerns or require more information regarding this project, <br /> please feel free to contact me at (720) 942-3480 or Miguel Hamarat at (720) 942-3255. <br /> Regards, <br /> Amber Parmet <br /> Senior Environmental Engineer <br /> Climax Molybdenum Company <br />