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<br />. <br /> <br />. <br /> <br />. <br /> <br />~7Sj <br /> <br />Areas withdrawn from mineral entry by the Forest Service, excluding <br />conflicting mineral patents, are as follows: <br /> <br />NE, Nt SE, EtEt NW sec. 26. T, 11 S., R. 81 W. <br /> <br />The remainder of the area surrounding Twin Lakes is privately owned, <br />All patented mining claims within or near the reservoir are shown on <br />figure 5. <br /> <br />There is no indication of current staking. exploration, or mining <br />activity near the limits of the proposed Twin Lakes Reservoir. <br /> <br />GEOLOGY <br /> <br />The Twin Lakes are located on a terminal moraine left by a <br />Pleistocene glacier that carved the valley now ,occupied by Lake Creek. <br />Low hills along the eastern side of the lower lake are a moraine formed <br />by continued dropping of glacier-carried sediments during an extended <br />period. Relatively rapid recession of the glacier ensued during a warmer <br />period. A depression now occupied by the lower lake resulted because the <br />rapid recession prevented deep accumulation of debris. <br /> <br />The events described were repeated at a later date, providing a <br />natural division between the lower and upper lakes, and providing, too, <br />the basin now occupied by the upper lake. <br /> <br />Since the retreat of this glacier. Lake Creek has deposited some <br />sorted sands and gravels in the upstream part of the upper lake. Alluvial <br />deposits over most of,valley floor are composed of unsorted glacial <br />debris. <br /> <br />MINERAL RESOURCES <br /> <br />Placer Gold <br /> <br />Unsorted glacial moraines often contain gold, but their mode of <br />formation is such that concentration of the gold content, necessary for <br />commercial recovery, cannot take place.?/In describing the placer poten- <br />tial of the Twin Lakes district, Howellfl states that lithe effects of <br />glaciation have been to render remote the possibilities of finding work- <br />able placer deposits above the first Falls of Lake Creek, Even if the <br />gravels of that point show a small gold content. the preponderance of <br />large boulders in the streambed would increase the operating expenses to <br />a prohibitive figure." <br /> <br />~ Howell, J. V. Twin Lakes District of Colorado. COlorado Geological <br />Survey Bull. 17. 1919. <br /> <br />XI-27 <br />