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., ATTAcHmd~- C STATE OF COLORADO Roy Romsr, Governor DEPARTMENT OF NATURAL RESOURCES DIVIeSI~ONe~OF WILDLIFE Perry D. Olson, D~reolor 6060 Broatlway Den,er. CObratlo 60276 Teiephone~ 13031 297 7 192 Sortheast Regional Office 2126 Borth Weber Street Colorado Springs, CO 80907 Telephone: (719) 473-2945 December 11, 1990 ttr. Uouq Watrons P. O. Box 66 Idaho Springs, CO 80452 Dear Doug, aEFEq Tp For [i-"ildlife- For People Per your request I have drafted a letter to replace the original letter outlining potential wildlife impacts for the t•fendota Mine. Yocr consultant Maxine Stewart and I met December 9, 1989 for an inspection of the operation site. She explained how the mine would operate and pointed out the perimeter boundaries of the operation. This letter will respond only to the • operation as described to me during the site inspection. Any changes or additions to the mine operation plan must be addressed at another time. The P7endota Mine west of Silver Plume is utilized heavily by bighorn sheep, small maamals and birds. Clear Creek adjacent to the site is populated by brook, snake river cutthroat and stocked catchable (6"-12") rainbow trout. tJo threatened or endangered species are known to inhabit the operation area. All precautions should be undertaken to ensure the integrity of Clear Creek remains intact. Discharge from the mine should be filtered through some type of settling system to reduce sedimentation and heavy metal discharges. It was indicated that a settling pond may be located near the steep slopes on the site. To prevent accidental drowning, or if a cyanide system is utilized a perimeter fence is recommended around the pond. To be the most effective the fence should be of an impenetrable type at least 6 foot in height. Bighorn sheep are particularly susceptible to respiratory ailments, I would recommend that all measures be taken to reduce fugitive dust levels which may cor.trfbute toward these respiratory problems. Some possible solutions would be to mount sprayers on the conveyors unloading rock into crushers and repeated spraying o£ the operation floor to reduce dust generated by heavy vehicles. • -continued- DEPA RTMEN7 OF NATURAL RESOURCES. Hamlet J. Barry, Executive Director 1NILD LIFE COMMISSION, William R. Hegberg, Chairman . Dennls Luttrell. Vice Ghairman . Eldon W. Cooper. Secretary Felix Cnavez. Member . Rebecca L Frank Member . Louts F. Swift Member . George VanDenBerg, Member . Larry M Wrig hl. Mem be