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CUmax Molybdenum <br />A Freeport- McMoRan Company <br />Sent by Certified Mail <br />February 6, 2013 <br />Mr. Eric Scott <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman St. Room 215 <br />Denver, Colorado 80203 <br />Climax Mine <br />Highway 91 - Fremont Pass <br />Climax, CO 80429 <br />Phone (719) 486 -7718 <br />Fax (719) 486 -2251 <br />RECEIVED <br />MAR 0 6 2013 <br />DlVision of Reclamation, <br />Mining & Safety <br />RE: Sludge Test Cell Location Addendum to Technical Revision (TR) -19 - Property Discharge <br />Water Treatment Plant (PDWTP), Climax Mine Permit No. M- 1977 -493 <br />Dear Mr. Scott, <br />This letter and attachments are an addendum to Technical Revision (TR) 19 — Property Discharge Water <br />Treatment Plant (PDWTP). This addendum provides information regarding a sludge test cell for the Property <br />Discharge Water Treatment Plant (PDWTP). <br />The first attached drawing is based on the TR -19 submittal (Figure 2) that shows the test cell site and area of <br />the future, permanent site. Only a general area is shown for the permanent site since we do not know the final <br />dimensions or exact location at this time. Both areas are in the Clinton drainage and will be within the <br />ultimate Mayflower Tailing Storage Facility footprint. Also attached are a plan view and cross - section of the <br />test cell. Construction of the test cell will involve cutting and pushing soil to create a berm to contain the <br />sludge up to approximately 10 feet deep. We estimate a storage capacity of about 18,000 cubic yards of <br />sludge (2 to 3 years of placement), but the as -built volume and test cell dimensions could vary slightly. <br />The test cell will help us gain a better understand of sludge characteristics to aid in the design of the <br />permanent cell. For example, if the sludge dries and stacks easily, we could possibly fit more sludge in a cell <br />and have a smaller cell. If it flows and is unstable on a slope, then we need to design a larger cell. <br />Please accept this letter and attachments as an addendum to TR -19 for your files. Climax also will maintain <br />this information with our copies of TR -19. <br />Sincerely, <br />Raymond Lazuk <br />Environmental Manager <br />attachments <br />