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III 1111111111111111 Cyprus Climax Metals Company <br /> • 999 <br /> Climax Mine <br /> Highway 91 <br /> cc <br /> CYPRUS C6IMM Climax,Colorado 80429 <br /> Metals Company (719)486-2150 <br /> Fax: (719)486-2251 <br /> February 1, 1996 <br /> Certified Mail No. P 720 678 759 <br /> FEB Q b 1996 <br /> Mr. Allen Sorenson <br /> Division of Minerals and Geology <br /> Department of Natural Resources ` ueulugY <br /> 1313 Sherman Street, Room 215 <br /> Denver CO 80203 <br /> RE: Ground Water Monitoring Plan, Climax Mine and Mill, Technical Revision TR-08, Permit <br /> No. M-77-493 <br /> Dear Mr. Sorenson: <br /> This letter is in response to your November 6, 1996, letter requesting clarification and additional <br /> information related to the Climax Ground Water Technical Revision submitted to your office on <br /> September 29, 1995. The following are comments resultant of our review and interpretation of <br /> the Division requests. I have developed my responses to coincide with the order in which they <br /> are brought forth in your letter. <br /> Site Hydrogeology <br /> The Division expressed an interest in the rationale behind Climax Molybdenum Company's <br /> (CMC's) assertion that the bulk permeability of rock in the underground is not capable of <br /> transporting significant quantities of water. While site specific information from the Climax <br /> underground workings is limited, there is a strong argument available given known <br /> characteristics of the Idaho Springs Formation and Silver Plume Granite in which the Climax <br /> Ore Body resides. <br /> Information from packer tests taken in the Idaho Springs Formation at the Henderson Mill <br /> indicates that the formation is extremely tight with hydraulic conductivities that approach 0.0 <br /> ft/yr within 80 feet of surface. These results are presented in Technical Exhibit No. 1. <br /> Underground workings at Climax are situated deep within Bartlett Mountain and represent what <br /> are easily defined as open channels with infinite hydraulic conductivity. The low to very-low <br /> permeability of the bulk Precambrian bedrock is not capable of transmitting a significant <br /> quantity of water and the primary pathway for water flow is within the underground workings. <br /> Please find the Climax Storm Water Management Plan enclosed with this submittal. This copy <br /> will also serve as an addendum to the August 11, 1995, submittal of the Climax Mine <br /> Environmental Protection Plan pursuant to Rule 6.4.19 (10) (b). <br />