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<br /> WESTERN ~ 400 South Lorena Avenue • <br /> TECNNOLO S Farmington, New Mexico 87401 <br /> ~~~ (5051 327-4966 • 327-5293 FAX <br /> <br />' <br /> San Juan County Mining Venture February 13, 1991 <br /> Post Office Boa 177 <br />' Silverton, Colorado 51433 <br /> Attention: Mr. Mike Foutz <br /> Regarding: Flattened Slope <br />Tailing Pond No. 2 WT No. 3121(1019 <br /> Sunnyside Mine <br /> Silverton, Colorado <br /> <br /> As you requested, we have completed the add itional slops <br /> stability analysis for the above referenced project. The <br /> purpose of the analysis is to determine the factor of safety at <br />' a proposed slope of 2.5 to 1. <br /> This analysis used information derived from our report dated <br /> October 2, 1990 with Job No. 3120K114. <br />' It is understood that equipment will excavate the slope: from <br />the top of the pond downward toward Boulder Creek. Cui; <br />' material ezcavated from the slope will raise the east :side of <br />the pond approximately 20 feet. A bench 20 feet in width will <br />be constructed at the ground surface approzimately 10 Eeet <br />above the creek during grading of the slope. <br />' PC STABL 4, developed by Purdue University, using a modified <br />Bishop technique, was utilized for the stability analyses of <br />the proposed slope. The stability analyses were conducted on <br />the slope cross-sections 3 and 5 provided by San Juan County <br />' Mining Venture. For psuedo-static analyses, a horizontal <br />acceleration of 0.087 q was used to simulate potential. <br />' earthquake loading. Effective stress analyses, utilizing the <br />L~ <br />I <br />