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<br />.jiG::J <br /> <br />. <br /> <br />There is no indication that profitable placers have been developed <br />in any of the morainal gravels above the location mentioned. Nellie <br />Placer No. l63~O, the only patented placer lying within the limits of <br />the reservoir site, conforms on the west side to the configuration of <br />the valley floor. Figure~, a typical view, was photographed toward the <br />east across the Nellie Placer. Little, if any, placer work was ever <br />done, and the development of commercial placers is not anticipated. <br /> <br />Base Metal Vein Deposits <br /> <br />In describing vein deposits of base metals near this area, Howell1/ <br />states: "All of the workable veins thus far discovered have been above <br />timberline, and there is reason for believing that the conditions for the <br />formation of veins were better above that elevation than below, Timber- <br />line itself, of course, had no effect" (fig. 6). <br /> <br />From examination of the area, it is apparent that commercial vein <br />deposits still have not been found along the lower hillsides. Although <br />several adits, including small pits on the Bryan and Sewall claims, <br />No. 16897, were found near the potential lake level, there was no indica- <br />tion of mineralization nor current mining activity. <br /> <br />Sand and Gravel <br /> <br />. <br /> <br />Extensive, unsorted, sand and gravel deposits occur in Twin Lakes <br />basin. Some sorted deposits should exist along the western limits of the <br />upper Twin Lake. Remoteness of these deposits from potential msrkets <br />precludes their consideration as commercial sources of sand and grsvel. <br />They should, however, satisfy any requirements for project construction. <br /> <br />011 and Gas <br /> <br />Rocks <br />intrusive. <br />for 011 or <br /> <br />in the vicinity of Twin Lakes are either metamorphic or <br />Sediments that might be considered source or reservoir <br />gas are not present. <br /> <br />rocks <br /> <br />CONCLUSIONS <br /> <br />Sand and gravel deposits within the reservoir basin are essentially <br />unsorted and are unlikely to become commercial sources. Because of the <br />remoteness of the project area from markets and the relatively low quality <br />of the sand and gravel, it must be assumed that these deposits have no <br />value other than aa needed for construction of the proposed dam. <br /> <br />1/ Work cited in footnote 2, p. 3. <br /> <br />. <br /> <br />x 1-29 <br />