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~- <br />„_ <br />i III IIIIIIIIIIIII III <br />s:~,_, CLIMAX MOLYBDENUM COMPANY <br />Dimsion of Cyprus b~maa Meceis Co <br />• t. <br /> <br />Colorado Operations <br />Henderson Mine <br />PO Box 60 <br />Empire, Colorado 60438 <br />Mecro [3031271-0107 <br />Ouc of Scace [3031 569-3221 <br />Fax (3031569-2830 <br />August 27, 1999 ~~Ci~\v~O <br />Certified Mail No. Z 260 518 519 PUG 3~t~91iGep\o9Y <br />Mr. Allen Sorenson ~`J\5`oretMl <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Technical Revision No. 8 (Henderson Mine Permi[ M-77-342) <br />Dear Mr. Sorenson: <br />This letter addresses the issues raised by the Colorado Division of Minerals and Geology <br />(Division) in your August 2, 1999 letter which responded to Climax Molybdenum <br />Company's (Henderson) technical revision No. 8 (TR) to Pem~it No. M-77-342. Below <br />we have responded to the specific issues contained in your letter. <br />1. How will the sludge be transported from Urad to Henderson and what measures <br />will be employed to assure containment during transport? <br />The sludge will be transported from Urad to Pond ].2 in a dump truck with an <br />approximate capacity of 9 cubic yards. To assure containment of the sludge, we will do <br />tlvee things. First, the sludge will not be transported until it is adequately dewatererd for <br />transport. Second, we will line the truck bed with plastic to prevent any seepage of the <br />material, Finally, we will not completely fill the trucks, to prevent overfilling and reduce <br />the risk of fugitive losses during transport. <br />2. How will sludge be placed in Pond 1.2 to avoid damage to the pond liner? <br />We have contracted with [he engineering firm of W.W. Wheeler and Associates to devise <br />a strategy for protecting the liner during placement of the sludge. To avoid delaying <br />approval of this TR, we request that the Division approve [he TR with the condition that <br />Henderson agree to implement measures recommended by W.W. Wheeler [o protect the <br />liner. <br />3. What is the period of time anticipated to fill Pond 1.2? <br />We conservatively estimate that eve have adequate storage capacity in Pond 1.2 for seven <br />years worth of sludge generation. This number is based on very conservative estimates of <br />storage capacity and sludge generation. Since we have not operated the Urad water <br />