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1 L 1.0 INTRODUCTION AND SUMMARY tability and general integrity of the lower tailings dam at The s operation in Creede, Colorado has been Homestake's Bulldog Mountain Pe performed, and conclusions investigations and analyses p evaluated. The to improve the dam for made are presented herein• Recommendations current and future operations are also discussed. 1.1 BACK approximately 100 feet fil s dam is 1200 feet long an earth Ong attthetcenterline* The structure The lower tailing high at its maximum and s solid and liquid from a silver ore was built in 1974 to retain tailing Of the reservoir Although the maximum capacity has been processing operation• the reservoir is near 370 acre-feet, roximately behind the structure The and only partially filled since its co e i t behind the dam• slowly aids currently downstream of the dam are cabins located 150 acre-feet of solids and liquid nearest inhabited structures do a distance of approximately 5000 feet* Grande River at periods during the year* A state along the Rio short p ied for only traveled, are located The cabins are Occup both generally lightly highway and another road, 3000 to 4000 feet downstream of the dam• he impoundment in slurry ached along dam and The tailings solids and liquids are brought to t Solids have been be long the upstream face of t the fform.eriphery of pond. At the present time, The at other locations on the ed along am edge of the pond• discharged the upstreof cyanide, is liquid, contain tailings are being high ing relatively concentrations impounded upstream of the tailings beach. operation, seepage with n downstream the impoundment was put into • The Shortly after areas elevated cyanide appeared pp eared iand level elevation* Several has increased with increases in assess the cause and recommend seepagewere conducted to evaluations by others ✓ a -fid i I& -PAA �