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V <br /> COLORADO OPERATIONS <br /> ®Climax Molybdenum Henderson Mine and Mill <br /> A Freeport-McMoRan Company 19302 County Road 3 <br /> Parshall,CO 80435 <br /> Phone(303)569-3221 <br /> Fax(303)569-2830 <br /> March 30, 2018 <br /> Sent Via Email and UPS#: 1Z RY2 60T 03 0001 4216 APR <br /> Mr. Peter Hays jyv,�.,,__ OZ 20�8 <br /> Division of Reclamation Mining and Safety �'�'�j'ONOFlt�� M �rtO <br /> 1313 Sherman St., Rm. 215 Aivla � � <br /> Denver, CO 80203 Cry <br /> RE: Climax Molybdenum Company, Henderson Mill, Permit No. M-1977-342, Proposed <br /> Technical Revision 29; Number 3 Dam Buttress Stage I Adequacy Review Response <br /> Dear Mr. Hays: <br /> Climax Molybdenum Company (CMC) received your adequacy review letter dated February 28, 2018 for <br /> Technical Revision Request (TR-29) submitted on January 26, 2018. Due to the additional time needed <br /> for CMC to respond to the adequacy review and for the DRMS to review the response, CMC submitted an <br /> extension request to extend the review period to April 16. <br /> In the Adequacy Review letter, you requested that CMC submit additional information to the Division for <br /> completion of the review. Although CMC believes we have provided the necessary information for review <br /> of the Stage 1 portion of the project, we have included additional information and explanations in the <br /> attached letter provided by AECOM. This letter expands on the exhaustive level of field investigation and <br /> material characterization performed, as well as the methodologies used throughout the design process. <br /> CMC would like to further emphasize the extensive level of review by a 3rd party Technical Review Board <br /> comprised of industry recognized experts in the field of Geotechnical Analysis & Design. If you have any <br /> additional questions, please do not hesitate to contact me at (720) 942-3480 or Miguel Hamarat at (720) <br /> 942-3255. <br /> Regards, <br /> Amber Parmet <br /> Senior Environmental Engineer <br /> Henderson Operations <br /> Climax Molybdenum Company <br /> Attachments: <br /> 1. AECOM Adequacy Review Response Letter <br /> cc: M. Hamarat, Climax <br /> T. Haynes, Climax <br />