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999 <br />U. S. Department of Labor <br /> <br />~~~P <br />~r~~~ <br />RECEIVED •~~~ -- <br />NOV 10 1994 i0. <br />Mine Safety and Health Administration <br />P.O. Bon 25367 <br />Denver, Colorado 80225-0367 <br />DENVER SAFETY AND HEALTH TECHNOLOGY CENTER <br />Mine Waste and Construction Division <br />September 6, 1994 <br />MEMORANDUM FOR <br />THROUGH <br />FROM: <br />JAKE H. DEHERRERA <br />Acting District Manager, <br />Metal/Nonmetal Safety <br />Denver, Colorado <br />BILLY D. OWENS~ <br />Chief, Denver afe <br />Technology Cente <br />Division of Minerals 8r Geology <br />Report No. D8106-W3628 <br />Rocky Mountain District <br />and Health <br />Health <br />LARRY WILSON P.E <br />r~ <br />Civil Engineer, Mine Wast and <br />Construction Division <br />SUBJECT: Site Visit to the COM Inc. Mill Tailings Dam, Gold <br />Hill, Boulder County, Colorado, COM Inc., Mine ID <br />No. OS-04445 <br />As requested by your office, I visited the subject site on August <br />29, 1994, to determine the physical condition of ti.e darn and make <br />recommendations as to future stages of construction. Steve Ryan, <br />an inspector with your office accompanied me on this visit. The <br />Company representative was Wayne Tatman. <br />The purpose of this dam was to Contain and store the sand and <br />slimes from the gold processing mill located upstream, <br />approximately 200 feet northwest of the pool area. The pond is <br />capable of impounding approximately 5 acre-feet of water, <br />sediment or tailings. According to Mr. Tatman, the nearest <br />inhabited structure is approximately two miles below the dam. He <br />also stated that a small road is located approximately one mile <br />downstream. After checking the USGS topographic map of the area, <br />I believe the actual distances are less than those stated. It <br />appears the road is approximately ~{ mile downstream while the <br />buildings are approximately one mile away. Since the quantity of <br />water and tailings is small and the area immediately downstream <br />is heavily wooded, the structure should be classified as having a <br />low hazard potential. <br />This is a 17-foot high tailings structure with the pool area <br />measuring approximately 250 feet long and 60 feet wide. The <br />embankment has a crest width of approximately 9 feet and has <br />downstream slopes of approximately 2:1 (horizontal vertical). A <br />plastic liner material is preventing seepage water from flowing <br />