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CONSULTING ENGINEERS, INC. <br />L <br />C Mr. Thomas M. Robertson <br />Resident Manager <br />Bulldog Mountain Operation <br />Homestake Mining Company <br />P. 0. Box 100 <br />l Creede, Colorado <br />Dear Tom: <br />June 17, 1981 <br />Project No. RM81-271 <br />Phase IReport <br />Remedial Measures for Lower Tailings Dam <br />Bulldog Mountain Operation <br />This letter report presents the results of Phase I work by D'Apppolonia <br />Consulting Engineers, Inc. (D'Appolonia) to develop remedial measures for <br />the Lower Tailings Dam at the Homestake Mining Company's (Homestake) <br />Bulldog Mountain Operation. As outlined in our March 6, 1981 letter, a <br />four -phased approach is proposed to define and solve the seepage problem <br />at the Lower Tailings Dam. Phase I consists of analyzing existing <br />information and data recently collected at the site by Homestake. <br />It was planned that Phase II would be implemented if Phase I was inade- <br />quate to define the seepage path(s) and/or remedial measures. Phase II <br />would involve additiona) subsurface investigation to define the seepage <br />conditions. Phase III is the development of conceptual remedial measures, <br />and Phase IV consists of the final design of the selected remedial <br />measure. The information, analyses, and conclusions of Phase and <br />recommendations for Phase II are contained in this report. <br />1.0 BACKGROUND <br />The Bulldog Mountain Operation is located approximately one-half mile <br />northwest of Creede, in south central Colorado. The Lower Tailings Dam <br />is located approximately one mile southwest of Creede and approximately <br />one mile south of the older upper tailings dam, as shown in Figure 1. <br />(: The Bulldog Mine is an underground silver mine which uses a cyanide leach <br />1 process to recover the silver from the ore. Tailings which result <br />from the milling process are pumped to a pond behind the Lower Tailings <br />Dam. <br />10 DUFF ROAD, PITTSBURGH. PA 15235 TELEPHONE: 412/203-3200 TELE%'. 81.2378 <br />DENVER. CO BECKLEY, WV CHESTERTON, IN WILMINGTON. NC HOUSTON.T% BRUSSELS. BELGIUM• TEHERAN. IRAN <br />