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<br />• 11. Design Protective Measures - Measures to prote~:t the waste <br />piles from potentially damaging flood flows, were designed for the remain- <br />ing mine life and for after closure and reclamation. Channel gradients, <br />linings and check structures are recommended. <br />]2. Report Preparation - Results of the geotechnical and <br />hydrologic/hydraulic analyses are presented in this report. <br />13. Meetings with Cotter Corporation, MLRD and Attendance at <br />Mined Land Reclamation Board Hearings - Several meetings were held <br />with representatives of Cotter Corporation and an interim work <br />progress discussion was conducted with the MLRD to discuss the geotech- <br />nical and hydrologic/hydraulic approach to the stability analysis. <br />3.0 SITE CONDITIONS <br />• 3.1 Geology <br />The Schwartzwalder Mine and the adjoining surfacf~ facilities <br />are located in the steep-sided canyon of Ralston Creek northwest of <br />Golden. The valley trends in a northwest-southeast direction in the <br />vicinity of the mine. <br />The mine area is located on the eastern end of the Ro~:ky Mountains <br />geologic province; the Ralston Buttes, which are located ,lust. east of the <br />mine, have been formed by sedimentary rocks of the Hogback. <br />Bedrock formations underlying the valley and both its sides are <br />formed by Precambrian gneisses and schists of the Idaho Springs Forma- <br />tion. In addition to the bedrock formations, alluvial aid colluvial <br />soils have been identified in the valley and on both its sides. Man- <br />made fills such as fills covering the alluvial deposits of the creek <br />i <br />-6- <br />