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<br />r--- <br />lr':l <br />co <br />~ <br /> <br />BUREAU OF MINES <br /> <br />SUMMARY <br /> <br />The Bureau of Reclamation is considering two new reservoirs, Cement <br />Creek and Elko, to provide storage for water which would be used for mu- <br />nicipal and industrial purposes in the town of Gunnison, for local irri- <br />gation and recreation, and for fish and wildlife preservation. <br /> <br />Combined gross storage of the two reservoirs would be approximately <br />22,400 acre-feet, which includes 16,400 acre-feet of active storage and <br />6,000 acre-feet of inactive or dead storage. <br /> <br />Cement Creek Reservoir, on the stream of that name in Gunnison <br />County, would impound up to approximately 4,100 acre-feet in a reservoir <br />more than 1 mile long. Active capacity would be approximately 1,900 <br />acre-feet and inactive capacity, 2,200 acre-feet. <br /> <br />Elko Reservoir, on Tomichi Creek in Saguache County, designed for <br />a total capacity of about 18,300 acre-feet in a 2-1/3-mile-long reser- <br />voir, would have approximately 14,500 acre-feet of active storage and <br />3,800 acre-feet of inactive storage. <br /> <br />Surface rocks at the Cement Creek Damsi te are Precambrian granite. <br />The reservoir would inundate primarily Paleozoic sedimentary rocks. <br />Surface rocks at the Elko Damsi te and Reservoir are predominantly Pre- <br />cambrian granite. <br /> <br />A small warm spring in the proposed Cement Creek Reservoir is about <br />the only feature of mineral resource int erest found in the twO sites in- <br />vestigated. Some sand and gravel does occur in the Elko site, but no <br />market now exists for these deposits because road and other construction <br />in the area are dormant. Potential growth areas, such as Gunnison, have <br />sources of sand and gravel nearer than those at the Elko site. other <br />mineral resources of present or potential economic importance are not <br />known to exist in either project area.. <br /> <br />INTRODUCTION <br /> <br />At the request of the Bureau of Reclamation, Region 4, Salt Lake <br />City, the Bureau of Mines investigated the possibility of mineral re- <br />source occurrences in the Cement Creek and Elko Reservoir sites, Upper <br />Gunnison Project (fig. 1). An onsite examination was made in July 1970. <br />In addition, a. study was made of pertinent literature. Aerial photographs <br />were taken by the Geological Survey of the Cement Creek area (fig. 2) in <br />September 1958, and of the Elko site (fig. 3) in September 19/52. <br /> <br />66 <br />